NCBI Conserved Domain Search

Pleckstrin homology domain;

Pssm-ID: 465218 Cd Length: 143 Bit Score: 294.30 E-value: 4.01e-92

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   1440 VQCEGLSEQLVFNSVTNCLGPRKFLHSGKLYKAKSNKELYGFLFNDFLLLTQITKPLGSSGTDKVFSPKSNLQYKMYKTP 1519
Cdd:pfam16652    1 VQCEGLSEQLVFNSLTNCLGPRKLLHSGKLYKVKSNKELVGFLFNDFLLLTQPVKPLSSAGTDKLFSSKSNIQYKMYKTP 80

                           90       100       110       120       130       140
                   ....*....|....*....|....*....|....*....|....*....|....*....|...
gi 47717123   1520 IFLNEVLVKLPTDPSGDEPIFHISHIDRVYTLRAESINERTAWVQKIKAASELYIETEKKKRE 1582
Cdd:pfam16652   81 IFLNEVMVKLPTDPSSSEPTFQLSHIDRVYTLKAESPNERTAWVKKIKEASELYIETEKKKRE 143

Intersectin Pleckstrin homology (PH) domain; ITSNs, an adaptor protein family, play a role in endo- and exocytosis, actin cytoskeleton rearrangement and signal transduction. There are two human ITSN genes: ITSN1 and ITSN2. They share significant sequence identity and a similar domain structure having both short and long isoforms produced by alternative splicing. The short isoform (ITSN-S) consists of two Eps15 homology domains (EH1 and EH2), a coiled-coil region (CCR) and five Src homology 3 domains (SH3A-E). The EH domains bind to Asn-Pro-Phe motifs and are implicated in endocytosis and vesicle transport. The SH3 domains bind to proline-rich sequences and are commonly found in proteins implicated in cell signalling pathways, cytoskeletal organization and membrane traffic. The long isoform (ITSN-L) contains three additional C-terminal domains, a Dbl homology domain (DH), a Pleckstrin homology domain (PH) and a C2 domain. The tandem DH-PH domains are present in all Dbl family of GEFs. ITSN acts specifically on Cdc42 through its DH domain with no portion of the PH domain making contact with Cdc42. This is in contrast to Dbs which requires the PH domain for full catalytic activity. The ITSN PH domain binds phosphoinositides. C2 domains are usually involved in Ca2+-dependent and Ca2+-independent phospholipid binding. There are more than 30 proteins that interact with ITSNs. ITSN-S is present in mammals, frogs, flies and nematodes, while ITSN-L is present only in vertebrates. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 270084 Cd Length: 132 Bit Score: 272.02 E-value: 1.60e-84

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1448 QLVFNSVTNCLGPRKFLHSGKLYKAKSNKELYGFLFNDFLLLTQITKPLGSSGTDKVFSPKSNLQYKMYKTPIFLNEVLV 1527
Cdd:cd13264    1 QLIFNSVTNCLGPRKFLHSGKLYKAKSNKELYGFLFNDFLLLTQPIKPLGSSGNDFVFDNKANIQYKMYKTPIFLNEVLV 80

                         90       100       110       120       130
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1528 KLPTDPSGDEPIFHISHIDRVYTLRAESINERTAWVQKIKAASELYIETEKK 1579
Cdd:cd13264   81 KLPTDPSGDEPIFHISHIDRVYTLRAESINERTAWVQKIKAASELYIETEKK 132

C2 domain present in Intersectin; A single instance of the C2 domain is located C terminally in the intersectin protein. Intersectin functions as a scaffolding protein, providing a link between the actin cytoskeleton and the components of endocytosis and plays a role in signal transduction. In addition to C2, intersectin contains several additional domains including: Eps15 homology domains, SH3 domains, a RhoGEF domain, and a PH domain. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. The members here have topology I.

Pssm-ID: 176021 [Multi-domain] Cd Length: 136 Bit Score: 268.48 E-value: 4.07e-83

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1582 EKAYLVRSQRATGIGRLMVNVVEGIELKPCRSHGKSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLCI 1661
Cdd:cd08375    1 EKAYLARSQRASGIGRLMVVIVEGRDLKPCNSNGKSDPYCEVSMGSQEHKTKVVSDTLNPKWNSSMQFFVKDLEQDVLCI 80

                         90       100       110       120       130
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1662 TVFERDQFSPDDFLGRTEIRVADIKKD-QGSKGPVTKCLLLHEVPTGEIVVRLDLQ 1716
Cdd:cd08375   81 TVFDRDFFSPDDFLGRTEIRVADILKEtKESKGPITKRLLLHEVPTGEVVVKLDLQ 136

Intersectin and clathrin adaptor AP2 binding region; INTAP is a natively unstructured region of intersectin 1 proteins, lying between the first pair of SH3 domains, that binds to the clathrin adaptor AP2. This binding forms an intersectin-AP2 complex that functions as an important regulator of clathrin-mediated SV recycling in synapses.

Pssm-ID: 435467 Cd Length: 115 Bit Score: 235.16 E-value: 7.38e-72

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    803 KIPENEVPAPVKPVTDSTsaPAPKLALRETPA-PLAV-TSSEPSTTPNNWADFSSTWPTSTNEKPETDNWDAWAAQPSLT 880
Cdd:pfam16617    1 KIPESEVPASVKPAADST--AAPKVALRETPTtPLAPpTSSESSTASNNWADFSSTWPTNSSEKAETDNWDAWAAQPSLT 78

                           90       100       110
                   ....*....|....*....|....*....|....*..
gi 47717123    881 VPSAGQLRQRSAFTPATATGSSPSPVLGQGEKVEGLQ 917
Cdd:pfam16617   79 VPSAGQLRQRSAFTPATVTGSSPSPVLGQGEKVEGLQ 115

Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases; Also called Dbl-homologous (DH) domain. It appears that PH domains invariably occur C-terminal to RhoGEF/DH domains.

Pssm-ID: 238091 [Multi-domain] Cd Length: 181 Bit Score: 183.65 E-value: 6.06e-53

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1238 RQGYIHELIVTEENYVNDLQLVTEIFQKPLMESEL-LTEKEVAMIFVNWKELIMCNIKLLKALRVRKKMSGekMPVKMIG 1316
Cdd:cd00160    1 RQEVIKELLQTERNYVRDLKLLVEVFLKPLDKELLpLSPEEVELLFGNIEEIYEFHRIFLKSLEERVEEWD--KSGPRIG 78

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1317 DILSAQLPHMQPYIRFCSRQLNGAALIQQKTDEAPDFKEFVKRLamDPRCKGMPLSSFILKPMQRVTRYPLIIKNILENT 1396
Cdd:cd00160   79 DVFLKLAPFFKIYSEYCSNHPDALELLKKLKKFNKFFQEFLEKA--ESECGRLKLESLLLKPVQRLTKYPLLLKELLKHT 156

                        170       180
                 ....*....|....*....|....*
gi 47717123 1397 PENHPDHSHLKHALEKAEELCSQVN 1421
Cdd:cd00160  157 PDGHEDREDLKKALEAIKEVASQVN 181

Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases; Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases Also called Dbl-homologous (DH) domain. It appears that PH domains invariably occur C-terminal to RhoGEF/DH domains. Improved coverage.

Pssm-ID: 214619 [Multi-domain] Cd Length: 180 Bit Score: 178.26 E-value: 4.47e-51

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    1242 IHELIVTEENYVNDLQLVTEIFQKPLMESE-LLTEKEVAMIFVNWKELIMCNIKLLKALRVRKKMSGekMPVKMIGDILS 1320
Cdd:smart00325    2 LKELLQTERNYVRDLKLLVEVFLKPLKKELkLLSPNELETLFGNIEEIYEFHRDFLDELEERIEEWD--DSVERIGDVFL 79

                            90       100       110       120       130       140       150       160
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    1321 AQLPHMQPYIRFCSRQLNGAALIQQKtDEAPDFKEFVKRLAMDPRCKGMPLSSFILKPMQRVTRYPLIIKNILENTPENH 1400
Cdd:smart00325   80 KLEEFFKIYSEYCSNHPDALELLKKL-KKNPRFQKFLKEIESSPQCRRLTLESLLLKPVQRLTKYPLLLKELLKHTPEDH 158

                           170       180
                    ....*....|....*....|..
gi 47717123    1401 PDHSHLKHALEKAEELCSQVNE 1422
Cdd:smart00325  159 EDREDLKKALKAIKELANQVNE 180

RhoGEF domain; Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases Also called Dbl-homologous (DH) domain. It appears that pfam00169 domains invariably occur C-terminal to RhoGEF/DH domains.

Pssm-ID: 459876 [Multi-domain] Cd Length: 176 Bit Score: 177.11 E-value: 1.09e-50

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   1242 IHELIVTEENYVNDLQLVTEIFQKPLMESELLTEKEVAMIFVNWKELIMCNIKLLkaLRVRKKmsgEKMPVKMIGDILSA 1321
Cdd:pfam00621    2 IKELLQTERSYVRDLEILVEVFLPPNSKPLSESEEEIKTIFSNIEEIYELHRQLL--LEELLK---EWISIQRIGDIFLK 76

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   1322 QLPHMQPYIRFCSRQLNGAALIQQKTDEAPDFKEFVKRLAMDPRCKGMPLSSFILKPMQRVTRYPLIIKNILENTPENHP 1401
Cdd:pfam00621   77 FAPGFKVYSTYCSNYPKALKLLKKLLKKNPKFRAFLEELEANPECRGLDLNSFLIKPVQRIPRYPLLLKELLKHTPPDHP 156

                          170       180
                   ....*....|....*....|
gi 47717123   1402 DHSHLKHALEKAEELCSQVN 1421
Cdd:pfam00621  157 DYEDLKKALEAIKEVAKQIN 176

Eps15 homology domain; Pair of EF hand motifs that recognise proteins containing Asn-Pro-Phe (NPF) sequences.

Pssm-ID: 197477 [Multi-domain] Cd Length: 96 Bit Score: 158.21 E-value: 3.57e-45

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123     214 EWAVPQSSRLKYRQLFNSHDKTMSGHLTGPQARTILMQSSLPQAQLASIWNLSDIDQDGKLTAEEFILAMHLIDVAMSGQ 293
Cdd:smart00027    1 PWAISPEDKAKYEQIFRSLDKNQDGTVTGAQAKPILLKSGLPQTLLAKIWNLADIDNDGELDKDEFALAMHLIYRKLNGY 80

                            90
                    ....*....|....*.
gi 47717123     294 PLPPVLPPEYIPPSFR 309
Cdd:smart00027   81 PIPASLPPSLIPPSKR 96

Fourth Src homology 3 domain (or SH3D) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212926 Cd Length: 65 Bit Score: 139.10 E-value: 7.98e-39

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1074 KKPEIAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGKKRQIGWFPANYVKLLSP 1138
Cdd:cd11993    1 KKPEIAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGKKRQIGWFPANYVKLLSP 65

Eps15 homology domain; Pair of EF hand motifs that recognise proteins containing Asn-Pro-Phe (NPF) sequences.

Pssm-ID: 197477 [Multi-domain] Cd Length: 96 Bit Score: 133.17 E-value: 2.37e-36

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123      14 IWAITVEERAKHDQQFHSLKP-ISGFITGDQARNFFFQSGLPQPVLAQIWALADMNNDGRMDQVEFSIAMKLIKLKLQGY 92
Cdd:smart00027    1 PWAISPEDKAKYEQIFRSLDKnQDGTVTGAQAKPILLKSGLPQTLLAKIWNLADIDNDGELDKDEFALAMHLIYRKLNGY 80

                            90
                    ....*....|....*.
gi 47717123      93 QLPSALPPVMKQQPVA 108
Cdd:smart00027   81 PIPASLPPSLIPPSKR 96

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 129.00 E-value: 1.96e-35

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1078 IAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGKKRQIGWFPANYVKL 1135
Cdd:cd11839    1 IAQVIAPFTATAENQLSLAVGQLVLVRKKSPSGWWEGELQARGKKRQIGWFPANYVKL 58

First Src homology 3 domain (or SH3A) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212920 [Multi-domain] Cd Length: 55 Bit Score: 128.19 E-value: 3.98e-35

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVkgewvDESQTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11987    1 YYRALYPFEARSHDEITIQPGDIVMV-----DESQTGEPGWLGGELKGKTGWFPANYAEK 55

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 124.30 E-value: 8.79e-34

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1158 CQVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11995    1 CQVIGMYDYTAQNDDELAFSKGQIINVLNKEDPDWWKGELNGQVGLFPSNYVKL 54

Third Src homology 3 domain (or SH3C) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212924 Cd Length: 52 Bit Score: 122.01 E-value: 5.24e-33

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVTKKDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11991    1 EYVAMYTYESNEQGDLTFQQGDVILVTKKDGDWWTGTVGDKTGVFPSNYVRP 52

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 115.59 E-value: 9.88e-31

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11840    1 QVIALFPYTAQNEDELSFQKGDIINVLSKDDPDWWRGELNGQTGLFPSNYVEP 53

Second Src homology 3 domain (or SH3B) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212922 [Multi-domain] Cd Length: 52 Bit Score: 115.58 E-value: 1.01e-30

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11989    1 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGEVQGQKGWFPKSYVKL 52

First Src homology 3 domain (or SH3A) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212770 [Multi-domain] Cd Length: 55 Bit Score: 112.45 E-value: 1.17e-29

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVkgewvDESQTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11836    1 KYRALYAFEARNPDEISFQPGDIIQV-----DESQVAEPGWLAGELKGKTGWFPANYVEK 55

Third Src homology 3 domain (or SH3C) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. The SH3C of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212772 [Multi-domain] Cd Length: 52 Bit Score: 111.35 E-value: 2.43e-29

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVTKKDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11838    1 EYIALYPYESNEPGDLTFNAGDVILVTKKDGEWWTGTIGDRTGIFPSNYVRP 52

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 110.07 E-value: 8.18e-29

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1158 CQVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11996    1 CQVIAMYDYTANNEDELSFSKGQLINVLNKDDPDWWQGEINGVTGLFPSNYVKM 54

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 109.38 E-value: 1.32e-28

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGEVQ-GQKGWFPKSYVKL 968
Cdd:cd11837    1 TATALYPWRAKKENHLSFAKGDIITVLEQQEMWWFGELEgGEEGWFPKSYVKE 53

Fourth Src homology 3 domain (or SH3D) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212927 Cd Length: 59 Bit Score: 107.32 E-value: 9.40e-28

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1078 IAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGKKRQIGWFPANYVKLL 1136
Cdd:cd11994    1 IAQVTTAYVASGVEQLSLSPGQLILILKKNSSGWWLGELQARGKKRQKGWFPASHVKLL 59

Second Src homology 3 domain (or SH3B) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212923 [Multi-domain] Cd Length: 52 Bit Score: 105.51 E-value: 2.97e-27

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11990    1 KAQALCSWTAKKDNHLNFSKNDIITVLEQQENWWFGEVHGGRGWFPKSYVKL 52

Eps15 homology domain; found in proteins implicated in endocytosis, vesicle transport, and signal transduction. The alignment contains a pair of EF-hand motifs, typically one of them is canonical and binds to Ca2+, while the other may not bind to Ca2+. A hydrophobic binding pocket is formed by residues from both EF-hand motifs. The EH domain binds to proteins containing NPF (class I), [WF]W or SWG (class II), or H[TS]F (class III) sequence motifs.

Pssm-ID: 238009 [Multi-domain] Cd Length: 67 Bit Score: 100.76 E-value: 2.03e-25

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  225 YRQLFNSHDKTMSGHLTGPQARTILMQSSLPQAQLASIWNLSDIDQDGKLTAEEFILAMHLIDVAMS 291
Cdd:cd00052    1 YDQIFRSLDPDGDGLISGDEARPFLGKSGLPRSVLAQIWDLADTDKDGKLDKEEFAIAMHLIALALN 67

Eps15 homology domain; found in proteins implicated in endocytosis, vesicle transport, and signal transduction. The alignment contains a pair of EF-hand motifs, typically one of them is canonical and binds to Ca2+, while the other may not bind to Ca2+. A hydrophobic binding pocket is formed by residues from both EF-hand motifs. The EH domain binds to proteins containing NPF (class I), [WF]W or SWG (class II), or H[TS]F (class III) sequence motifs.

Pssm-ID: 238009 [Multi-domain] Cd Length: 67 Bit Score: 100.37 E-value: 2.91e-25

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123   26 DQQFHSLKPI-SGFITGDQARNFFFQSGLPQPVLAQIWALADMNNDGRMDQVEFSIAMKLIKLKLQ 90
Cdd:cd00052    2 DQIFRSLDPDgDGLISGDEARPFLGKSGLPRSVLAQIWDLADTDKDGKLDKEEFAIAMHLIALALN 67

C2 domain;

Pssm-ID: 425499 [Multi-domain] Cd Length: 104 Bit Score: 99.70 E-value: 1.39e-24

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTMGSQCHI--TKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQFSPDD 1673
Cdd:pfam00168    1 GRLTVTVIEAKNLPPKDGNGTSDPYVKVYLLDGKQKkkTKVVKNTLNPVWNETFTFSVPDPENAVLEIEVYDYDRFGRDD 80

                           90
                   ....*....|....*..
gi 47717123   1674 FLGRTEIRVADIKKDQG 1690
Cdd:pfam00168   81 FIGEVRIPLSELDSGEG 97

Third Src homology 3 domain (or SH3C) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (SH3C) of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212925 Cd Length: 52 Bit Score: 96.62 E-value: 3.76e-24

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVTKKDGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd11992    1 EYIALYPYSSSEPGDLTFNEGEEILVTQKDGEWWTGSIEDRTGIFPSNYVR 51

Protein kinase C conserved region 2 (CalB); Ca2+-binding motif present in phospholipases, protein kinases C, and synaptotagmins (among others). Some do not appear to contain Ca2+-binding sites. Particular C2s appear to bind phospholipids, inositol polyphosphates, and intracellular proteins. Unusual occurrence in perforin. Synaptotagmin and PLC C2s are permuted in sequence with respect to N- and C-terminal beta strands. SMART detects C2 domains using one or both of two profiles.

Pssm-ID: 214577 [Multi-domain] Cd Length: 101 Bit Score: 97.17 E-value: 1.02e-23

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    1597 RLMVNVVEGIELKPCRSHGKSNPYCEVTMGSQCHI---TKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQFSPDD 1673
Cdd:smart00239    1 TLTVKIISARNLPPKDKGGKSDPYVKVSLDGDPKEkkkTKVVKNTLNPVWNETFEFEVPPPELAELEIEVYDKDRFGRDD 80

                            90       100
                    ....*....|....*....|
gi 47717123    1674 FLGRTEIRVADIKKDQGSKG 1693
Cdd:smart00239   81 FIGQVTIPLSDLLLGGRHEK 100

C2 domain; The C2 domain was first identified in PKC. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 175973 [Multi-domain] Cd Length: 102 Bit Score: 96.37 E-value: 2.10e-23

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1598 LMVNVVEGIELKPCRSHGKSNPYCEVTMGS-QCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQFSPDDFLG 1676
Cdd:cd00030    1 LRVTVIEARNLPAKDLNGKSDPYVKVSLGGkQKFKTKVVKNTLNPVWNETFEFPVLDPESDTLTVEVWDKDRFSKDDFLG 80

                         90
                 ....*....|....*
gi 47717123 1677 RTEIRVADIKKDQGS 1691
Cdd:cd00030   81 EVEIPLSELLDSGKE 95

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 88.75 E-value: 2.08e-21

                            10        20        30        40        50
                    ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123    1157 VCQVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVN-GQVGLFPSNYVK 1210
Cdd:smart00326    2 GPQVRALYDYTAQDPDELSFKKGDIITVLEKSDDGWWKGRLGrGKEGLFPSNYVE 56

First Src homology 3 domain (or SH3A) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN2 is expected to bind many protein partners, similar to ITSN1 which has been shown to bind Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212921 [Multi-domain] Cd Length: 57 Bit Score: 86.46 E-value: 1.61e-20

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  743 VYYRALYPFESRSHDEITIQPGDIVMVkgewvDESQTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11988    2 VNYRALYPFEARNHDEMSFNAGDIIQV-----DEKTVGEPGWLYGSFQGNFGWFPCNYVEK 57

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 85.21 E-value: 3.95e-20

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVN-GQVGLFPSNY 1208
Cdd:cd00174    1 YARALYDYEAQDDDELSFKKGDIITVLEKDDDGWWEGELNgGREGLFPANY 51

RhoGEF, Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases [Signal transduction mechanisms];

Pssm-ID: 227709 [Multi-domain] Cd Length: 1175 Bit Score: 96.11 E-value: 1.45e-19

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1227 LLDMLTPTERKRQGYIHELIVTEENYVNDLQLVTEIFQKPLMESELLTE----KEVAMIFVNWKELIMCNIKLLKALRVR 1302
Cdd:COG5422  474 VWESLPKQEIKRQEAIYEVIYTERDFVKDLEYLRDTWIKPLEESNIIPEnarrNFIKHVFANINEIYAVNSKLLKALTNR 553

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1303 KKMSGekmPVKMIGDILSAQLPHMQPYIRFCSRQLNGAALIQQKTDEAPDFKEFVKRLAMDPRCKGMPLSSFILKPMQRV 1382
Cdd:COG5422  554 QCLSP---IVNGIADIFLDYVPKFEPFIKYGASQPYAKYEFEREKSVNPNFARFDHEVERLDESRKLELDGYLTKPTTRL 630

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1383 TRYPLIIKNILENTPENHPDHSHLKHALEKAEELCSQVNEGVREKENsdRLEWIQahvqcegLSEQLVFNSVTNCLG--- 1459
Cdd:COG5422  631 ARYPLLLEEVLKFTDPDNPDTEDIPKVIDMLREFLSRLNFESGKAEN--RGDLFH-------LNQQLLFKPEYVNLGlnd 701

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1460 -PRKFLHSGKLY---KAKSNKELYG----FLFNDFLLLTQItKPLGSSGTDKVFSPKSNLQYkMYKTPIFLNEVLVKLPT 1531
Cdd:COG5422  702 eYRKIIFKGVLKrkaKSKTDGSLRGdiqfFLLDNMLLFCKA-KAVNKWRQHKVFQRPIPLEL-LFISPDEDSPDRAEYLK 779

                        330       340       350       360       370
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1532 D-PSGD--EPIFHISHIDRVY-------------TLRAESINERTAWVQKIK 1567
Cdd:COG5422  780 PaPSADvlDPAYNTKPPKNAYgfelygngqryqiTLYAETHAGRDTWLEHIK 831

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 82.68 E-value: 2.78e-19

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11805    1 RVQALYDFNPQEPGELEFRRGDIITVLDSSDPDWWKGELRGRVGIFPANYVQ 52

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 93.46 E-value: 6.93e-19

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  363 LELEKRRQALLEQQRKEQERLAQLERAEQERKERERqEQERKRQLELEKQLEKQrelerqreeerrkeIERREAAKRELE 442
Cdd:COG1196  234 LRELEAELEELEAELEELEAELEELEAELAELEAEL-EELRLELEELELELEEA--------------QAEEYELLAELA 298

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  443 R-QRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRI 521
Cdd:COG1196  299 RlEQDIARLEERRRELEERLEELEEELAELEEELEELEEELEELEEELEEAEEELEEAEAELAEAEEALLEAEAELAEAE 378

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  522 AEithlqqqlqesqqmlgrlipEKQILNDQLKQVQQNSLHRDSLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEID 601
Cdd:COG1196  379 EE--------------------LEELAEELLEALRAAAELAAQLEELEEAEEALLERLERLEEELEELEEALAELEEEEE 438

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  602 IFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEK 681
Cdd:COG1196  439 EEEEALEEAAEEEAELEEEEEALLELLAELLEEAALLEAALAELLEELAEAAARLLLLLEAEADYEGFLEGVKAALLLAG 518


                 ...
gi 47717123  682 LKR 684
Cdd:COG1196  519 LRG 521

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 80.47 E-value: 1.78e-18

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKE--DPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11875    5 LFDYEAENEDELTLREGDIVTILSKDceDKGWWKGELNGKRGVFPDNFVEP 55

C2 domain first and third repeat in Synaptotagmin-like proteins; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains either the first or third repeat in Synaptotagmin-like proteins with a type-I topology.

Pssm-ID: 176037 [Multi-domain] Cd Length: 121 Bit Score: 81.18 E-value: 7.38e-18

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELK------PCRSHGKSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQf 1669
Cdd:cd08391    1 GVLRIHVIEAQDLVakdkfvGGLVKGKSDPYVIVRVGAQTFKSKVIKENLNPKWNEVYEAVVDEVPGQELEIELFDEDP- 79

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|....
gi 47717123 1670 SPDDFLGRTEIRVADIKKdqgsKGPVTKCLLLHEVPTGEIVVRL 1713
Cdd:cd08391   80 DKDDFLGRLSIDLGSVEK----KGFIDEWLPLEDVKSGRLHLKL 119

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 78.52 E-value: 8.83e-18

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11826    2 VVALYDYTADKDDELSFQEGDIIYVTKKNDDGWYEGVLNGVTGLFPGNYV 51

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 78.15 E-value: 1.27e-17

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11823    6 YSYTANREDELSLQPGDIIEVHEKQDDGWWLGELNGKKGIFPATYV 51

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 77.31 E-value: 2.35e-17

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11766    5 KFNYEAQREDELSLRKGDRVLVLEKSSDGWWRGECNGQVGWFPSNYV 51

C-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also has roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRAP2 binds to different motifs found in substrate peptides including the typical PxxP motif in hematopoietic progenitor kinase 1 (HPK1), the RxxK motif in SLP-76 and HPK1, and the RxxxxK motif in phosphatase-like protein HD-PTP. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212883 [Multi-domain] Cd Length: 53 Bit Score: 75.63 E-value: 1.08e-16

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11950    1 QVRALYDFEALEDDELGFNSGDVIEVLDSSNPSWWKGRLHGKLGLFPANYVA 52

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 75.58 E-value: 1.17e-16

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1157 VCQVigMYDYTAQNDDELAFNKGQIINVLNK--EDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd12142    1 YCRV--LFDYNPVAPDELALKKGDVIEVISKetEDEGWWEGELNGRRGFFPDNFV 53

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 75.04 E-value: 1.38e-16

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11877    1 LVRAKFNFEGTNEDELSFDKGDIITVTQVVEGGWWEGTLNGKTGWFPSNYVKE 53

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 85.76 E-value: 1.78e-16

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  366 EKRRqALLE---------QQRKEQERlaQLERAEQ--ERKERERQEQERkrQLE-LEKQLEKqrelerqreeerrkeier 433
Cdd:COG1196  155 EERR-AIIEeaagiskykERKEEAER--KLEATEEnlERLEDILGELER--QLEpLERQAEK------------------ 211

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  434 reAAK-RELerqrQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIES 512
Cdd:COG1196  212 --AERyREL----KEELKELEAELLLLKLRELEAELEELEAELEELEAELEELEAELAELEAELEELRLELEELELELEE 285

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  513 TNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQ-VQQNSLHRDSLVTLKRALEAKELARQHLRDQLDEVEK 591
Cdd:COG1196  286 AQAEEYELLAELARLEQDIARLEERRRELEERLEELEEELAElEEELEELEEELEELEEELEEAEEELEEAEAELAEAEE 365

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  592 ETRSKLQEIDifnnQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQ 671
Cdd:COG1196  366 ALLEAEAELA----EAEEELEELAEELLEALRAAAELAAQLEELEEAEEALLERLERLEEELEELEEALAELEEEEEEEE 441

                        330       340       350       360       370
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  672 RPRKLHEEEKLKREESVKKKDGEEKGKQEAQDKLGRLFHQHQEPAKPAVQAPWSTAE 728
Cdd:COG1196  442 EALEEAAEEEAELEEEEEALLELLAELLEEAALLEAALAELLEELAEAAARLLLLLE 498

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The N-terminal SH3 domain of GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212738 [Multi-domain] Cd Length: 52 Bit Score: 74.70 E-value: 2.05e-16

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKE-DPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11804    3 VAKHDFKATAEDELSFKKGSILKVLNMEdDPNWYKAELDGKEGLIPKNYI 52

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRB2 binds to Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, as well as to the proline-rich C-terminus of FGRF2. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212882 [Multi-domain] Cd Length: 53 Bit Score: 74.49 E-value: 2.05e-16

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11949    2 VQALFDFDPQEDGELGFRRGDFIEVMDNSDPNWWKGACHGQTGMFPRNYVT 52

Src homology 3 domain of Signal Transducing Adaptor Molecule 1; STAM1 is part of the endosomal sorting complex required for transport (ESCRT-0) and is involved in sorting ubiquitinated cargo proteins from the endosome. It may also be involved in the regulation of IL2 and GM-CSF mediated signaling, and has been implicated in neural cell survival. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212897 [Multi-domain] Cd Length: 55 Bit Score: 74.60 E-value: 2.32e-16

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVklTTD 1214
Cdd:cd11964    2 KVRAIYDFEAAEDNELTFKAGDIITILDDSDPNWWKGETPQGTGLFPSNFV--TAD 55

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 74.29 E-value: 2.50e-16

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1158 CQVIgmYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11874    2 CKVL--FSYTPQNEDELELKVGDTIEVLGEVEEGWWEGKLNGKVGVFPSNFVKE 53

Src homology 3 domain of Ysc84p and similar fungal proteins; This family is composed of the Saccharomyces cerevisiae proteins, Ysc84p (also called LAS17-binding protein 4, Lsb4p) and Lsb3p, and similar fungal proteins. They contain an N-terminal SYLF domain (also called DUF500) and a C-terminal SH3 domain. Ysc84p localizes to actin patches and plays an important in actin polymerization during endocytosis. The N-terminal domain of both Ysc84p and Lsb3p can bind and bundle actin filaments. A study of the yeast SH3 domain interactome predicts that the SH3 domains of Lsb3p and Lsb4p may function as molecular hubs for the assembly of endocytic complexes. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212776 [Multi-domain] Cd Length: 55 Bit Score: 74.00 E-value: 4.18e-16

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDG---DWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11842    3 VALYDFAGEQPGDLAFQKGDIITILKKSDsqnDWWTGRIGGREGIFPANYVEL 55

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 73.59 E-value: 4.71e-16

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPD----WWKGEVNGQVGLFPS 1206
Cdd:cd11762    5 LYDYEAQSDEELSFPEGAIIRILRKDDNGvddgWWEGEFNGRVGVFPS 52

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 73.49 E-value: 5.52e-16

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11772    5 LYDYEAQHPDELSFEEGDLLYISDKSDPNWWKATCGGKTGLIPSNYV 51

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 83.45 E-value: 9.98e-16

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  343 EKKLPVTfedkkRENFERGNL---ELEKRRQALlEQQR---------KEQERLAQLERAEQERKERERQEQERKRQL-EL 409
Cdd:COG1196  178 ERKLEAT-----EENLERLEDilgELERQLEPL-ERQAekaeryrelKEELKELEAELLLLKLRELEAELEELEAELeEL 251

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  410 EKQLEKQRelerqreeerrkeierreAAKRELERQRQLEweRNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKK 489
Cdd:COG1196  252 EAELEELE------------------AELAELEAELEEL--RLELEELELELEEAQAEEYELLAELARLEQDIARLEERR 311

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  490 HQLEGKLQdircRLTTQRQEIEstnksrelriAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQnslhrdslvtlk 569
Cdd:COG1196  312 RELEERLE----ELEEELAELE----------EELEELEEELEELEEELEEAEEELEEAEAELAEAEE------------ 365

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  570 rALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREihnkQQLQKQKSMEAERLKQKEQERKIIELEKQKEEA 649
Cdd:COG1196  366 -ALLEAEAELAEAEEELEELAEELLEALRAAAELAAQLEELEE----AEEALLERLERLEEELEELEEALAELEEEEEEE 440

                        330       340       350
                 ....*....|....*....|....*....|....*....
gi 47717123  650 QRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKREESV 688
Cdd:COG1196  441 EEALEEAAEEEAELEEEEEALLELLAELLEEAALLEAAL 479

C2 domain first repeat present in Synaptotagmin-like proteins; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 175990 [Multi-domain] Cd Length: 128 Bit Score: 74.77 E-value: 1.56e-15

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIEL--KPCRSHGKSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQFSPDD 1673
Cdd:cd04024    1 GVLRVHVVEAKDLaaKDRSGKGKSDPYAILSVGAQRFKTQTIPNTLNPKWNYWCEFPIFSAQNQLLKLILWDKDRFAGKD 80

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1674 FLGRTEIRVADIKKDqGSKGPVTKCLLLHEVPT-------GEIVVRLDL 1715
Cdd:cd04024   81 YLGEFDIALEEVFAD-GKTGQSDKWITLKSTRPgktsvvsGEIHLQFSW 128

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 82.80 E-value: 1.62e-15

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEKKLPV---TFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQER-----KRQ 406
Cdd:TIGR02168  218 LKAELRELELALLVlrlEELREELEELQEELKEAEEELEELTAELQELEEKLEELRLEVSELEEEIEELQKElyalaNEI 297

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    407 LELEKQLEKQRELERqreeerrkeierreAAKRELER-QRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEAL 485
Cdd:TIGR02168  298 SRLEQQKQILRERLA--------------NLERQLEElEAQLEELESKLDELAEELAELEEKLEELKEELESLEAELEEL 363

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    486 NDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRDsL 565
Cdd:TIGR02168  364 EAELEELESRLEELEEQLETLRSKVAQLELQIASLNNEIERLEARLERLEDRRERLQQEIEELLKKLEEAELKELQAE-L 442

                          250       260       270       280       290       300       310
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 47717123    566 VTLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELR-EIHNKQQLQKQKSMEAERLKQKEQERK 638
Cdd:TIGR02168  443 EELEEELEELQEELERLEEALEELREELEEAEQALDAAERELAQLQaRLDSLERLQENLEGFSEGVKALLKNQS 516

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 71.88 E-value: 1.72e-15

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 47717123   1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:pfam14604    2 LYPYEPKDDDELSLQRGDVITVIEESEDGWWEGINTGRTGLVPANYVE 49

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 71.47 E-value: 2.03e-15

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*
gi 47717123   1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVN-GQVGLFPS 1206
Cdd:pfam00018    3 LYDYTAQEPDELSFKKGDIIIVLEKSEDGWWKGRNKgGKEGLIPS 47

Cytoskeletal-regulatory complex EF hand; This is an efhand family from the N-terminal of actin cytoskeleton-regulatory complex END3 and similar proteins from fungi and closely related species.

Pssm-ID: 289529 Cd Length: 104 Bit Score: 73.56 E-value: 2.06e-15

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    224 KYRQLFNSHdKTMSGHLTGPQARTILMQSSLPQAQLASIWNLSDIDQDGKLTAEEFILAMHLIDVAMSG--QPLPPVLPP 301
Cdd:pfam12763   11 KYWEIFSGL-KPENNKLTGDQVSPVLKNSRLPDDQLAKIWDLADIDSDGKLDFEEFCIAMRLIFDLVNGniADVPDELPD 89


                   ....*.
gi 47717123    302 EYIPPS 307
Cdd:pfam12763   90 WLVPGS 95

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 82.03 E-value: 2.55e-15

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    348 VTFEDKKREN--FERGNlELEKrrqalLEQQRKEQERLA------------QLERAEQERKERERQEQERKRQL-ELEKQ 412
Cdd:TIGR02168  661 ITGGSAKTNSsiLERRR-EIEE-----LEEKIEELEEKIaelekalaelrkELEELEEELEQLRKELEELSRQIsALRKD 734

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    413 LEK-QRELERQREEERRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQ 491
Cdd:TIGR02168  735 LARlEAEVEQLEERIAQLSKELTELEAEIEELEERLEEAEEELAEAEAEIEELEAQIEQLKEELKALREALDELRAELTL 814

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    492 LEGKLQDIRCRLTTQRQEIESTNKS---RELRIAEITHLQQQLQESQQMLGRLIPEkqiLNDQLKQVQQnslhrdslvtl 568
Cdd:TIGR02168  815 LNEEAANLRERLESLERRIAATERRledLEEQIEELSEDIESLAAEIEELEELIEE---LESELEALLN----------- 880

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    569 krALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQK-SMEAERLKQKEQERKIIELEKQKE 647
Cdd:TIGR02168  881 --ERASLEEALALLRSELEELSEELRELESKRSELRRELEELREKLAQLELRLEGlEVRIDNLQERLSEEYSLTLEEAEA 958

                          330
                   ....*....|..
gi 47717123    648 EAQRRAQERDKQ 659
Cdd:TIGR02168  959 LENKIEDDEEEA 970

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 71.47 E-value: 2.74e-15

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1158 CQVIgmYDYTAQNDDELAFNKGQIINVLNKE--DPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd12057    2 CKVL--FPYEAQNEDELTIKEGDIVTLISKDciDAGWWEGELNGRRGVFPDNFVKL 55

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 71.03 E-value: 3.61e-15

                            10        20        30        40        50
                    ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123     914 EGLQAQALYPWRAKKDNHLNFNKNDVITVLEQQD-MWWFGEVQ-GQKGWFPKSYVK 967
Cdd:smart00326    1 EGPQVRALYDYTAQDPDELSFKKGDIITVLEKSDdGWWKGRLGrGKEGLFPSNYVE 56

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 70.64 E-value: 6.23e-15

                            10        20        30        40        50
                    ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123    1003 SGEEFIAMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGD-KAGVFPSNYVR 1056
Cdd:smart00326    1 EGPQVRALYDYTAQDPDELSFKKGDIITVLEKsDDGWWKGRLGRgKEGLFPSNYVE 56

Cytoskeletal-regulatory complex EF hand; This is an efhand family from the N-terminal of actin cytoskeleton-regulatory complex END3 and similar proteins from fungi and closely related species.

Pssm-ID: 289529 Cd Length: 104 Bit Score: 72.02 E-value: 7.73e-15

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123     21 ERAKHDQQFHSLKPISGFITGDQARNFFFQSGLPQPVLAQIWALADMNNDGRMDQVEFSIAMKLIKLKLQGYQ--LPSAL 98
Cdd:pfam12763    8 EIKKYWEIFSGLKPENNKLTGDQVSPVLKNSRLPDDQLAKIWDLADIDSDGKLDFEEFCIAMRLIFDLVNGNIadVPDEL 87


                   .
gi 47717123     99 P 99
Cdd:pfam12763   88 P 88

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 70.05 E-value: 7.87e-15

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQ-VGLFPSNYVK 1210
Cdd:cd11825    5 LYDYRAQRPDELSFCKHAIITNVEKEDGGWWRGDYGGKkQKWFPANYVE 53

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 70.23 E-value: 8.27e-15

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGE-VNGQVGLFPSNYV 1209
Cdd:cd11812    2 VVALYDYTANRSDELTIHRGDIIRVLYKDNDNWWFGSlVNGQQGYFPANYV 52

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 70.19 E-value: 8.55e-15

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11820    2 KVRALYDFEAAEDNELTFKAGEIITVLDDSDPNWWKGSNHRGEGLFPANFVT 53

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 70.05 E-value: 9.96e-15

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVklTTDM 1215
Cdd:cd11963    3 KVRALYDFEAVEDNELTFKHGEIIIVLDDSDANWWKGENHRGVGLFPSNFV--TTDL 57

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 79.98 E-value: 1.14e-14

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  335 LEDEQQQLEKKLPVTFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKQLE 414
Cdd:COG1196  389 LEALRAAAELAAQLEELEEAEEALLERLERLEEELEELEEALAELEEEEEEEEEALEEAAEEEAELEEEEEALLELLAEL 468

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  415 KQRELERQREEERRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDkkHQLEG 494
Cdd:COG1196  469 LEEAALLEAALAELLEELAEAAARLLLLLEAEADYEGFLEGVKAALLLAGLRGLAGAVAVLIGVEAAYEAALE--AALAA 546

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  495 KLQDIRCRLTTQRQEIESTNKSRELRIAEI----------THLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRDS 564
Cdd:COG1196  547 ALQNIVVEDDEVAAAAIEYLKAAKAGRATFlpldkiraraALAAALARGAIGAAVDLVASDLREADARYYVLGDTLLGRT 626

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  565 LVTLkRALEAKELARQH---LRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIE 641
Cdd:COG1196  627 LVAA-RLEAALRRAVTLagrLREVTLEGEGGSAGGSLTGGSRRELLAALLEAEAELEELAERLAEEELELEEALLAEEEE 705

                        330       340       350       360       370       380
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  642 LEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKREESVKKKDGEEKGKQEAQDKLGRL 708
Cdd:COG1196  706 ERELAEAEEERLEEELEEEALEEQLEAEREELLEELLEEEELLEEEALEELPEPPDLEELERELERL 772

C-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domains (SH3c) of the related proteins, GRB2 and GRAP2, have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212884 Cd Length: 53 Bit Score: 69.44 E-value: 1.23e-14

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11951    6 YDFSAEDPSQLSFRRGDIIEVLDCPDPNWWRGRISGRVGFFPRNYV 51

C2 domain present in Arf GTPase Activating Proteins (GAP); ArfGAP is a GTPase activating protein which regulates the ADP ribosylation factor Arf, a member of the Ras superfamily of GTP-binding proteins. The GTP-bound form of Arf is involved in Golgi morphology and is involved in recruiting coat proteins. ArfGAP is responsible for the GDP-bound form of Arf which is necessary for uncoating the membrane and allowing the Golgi to fuse with an acceptor compartment. These proteins contain an N-terminal ArfGAP domain containing the characteristic zinc finger motif (Cys-x2-Cys-x(16,17)-x2-Cys) and C-terminal C2 domain. C2 domains were first identified in Protein Kinase C (PKC). C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176003 [Multi-domain] Cd Length: 145 Bit Score: 72.74 E-value: 1.30e-14

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1595 IGRLMVNVVEGIELKPCRSHGkSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQeVLCITVFERDQFSPDDF 1674
Cdd:cd04038    1 LGLLKVRVVRGTNLAVRDFTS-SDPYVVLTLGNQKVKTRVIKKNLNPVWNEELTLSVPNPMA-PLKLEVFDKDTFSKDDS 78


                 ....*.
gi 47717123 1675 LGRTEI 1680
Cdd:cd04038   79 MGEAEI 84

Src homology 3 domain of Ysc84p and similar fungal proteins; This family is composed of the Saccharomyces cerevisiae proteins, Ysc84p (also called LAS17-binding protein 4, Lsb4p) and Lsb3p, and similar fungal proteins. They contain an N-terminal SYLF domain (also called DUF500) and a C-terminal SH3 domain. Ysc84p localizes to actin patches and plays an important in actin polymerization during endocytosis. The N-terminal domain of both Ysc84p and Lsb3p can bind and bundle actin filaments. A study of the yeast SH3 domain interactome predicts that the SH3 domains of Lsb3p and Lsb4p may function as molecular hubs for the assembly of endocytic complexes. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212776 [Multi-domain] Cd Length: 55 Bit Score: 69.37 E-value: 1.65e-14

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDP--DWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11842    1 KAVALYDFAGEQPGDLAFQKGDIITILKKSDSqnDWWTGRIGGREGIFPANYVEL 55

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 79.80 E-value: 1.66e-14

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   331 EEPVLEDEQQQLEKKLPVtfeDKKRENFERGNLELEKRRQallEQQRKEQERLAQLERAEQERKERERQEQERKRQLELE 410
Cdd:PTZ00121 1351 EAEAAADEAEAAEEKAEA---AEKKKEEAKKKADAAKKKA---EEKKKADEAKKKAEEDKKKADELKKAAAAKKKADEAK 1424

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   411 KQLEKQRELERQREEERRKEIERReaAKRELERQRQLE-----WERNRRQELLNQRNKEQEDivVLKAKKKTLEFELEAL 485
Cdd:PTZ00121 1425 KKAEEKKKADEAKKKAEEAKKADE--AKKKAEEAKKAEeakkkAEEAKKADEAKKKAEEAKK--ADEAKKKAEEAKKKAD 1500

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   486 NDKKHQLEGKLQDiRCRLTTQRQEIESTNKSRELRIAEitHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRDSL 565
Cdd:PTZ00121 1501 EAKKAAEAKKKAD-EAKKAEEAKKADEAKKAEEAKKAD--EAKKAEEKKKADELKKAEELKKAEEKKKAEEAKKAEEDKN 1577

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   566 VTLKRALEAK--ELARQHLRDQLDEVEK-----------ETRSKLQEIDIFNNQLKELREIHNKQQLQKQKS-----MEA 627
Cdd:PTZ00121 1578 MALRKAEEAKkaEEARIEEVMKLYEEEKkmkaeeakkaeEAKIKAEELKKAEEEKKKVEQLKKKEAEEKKKAeelkkAEE 1657

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   628 ERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRP----RKLHEEEK-----LKREESVKKKDGEEKGK 698
Cdd:PTZ00121 1658 ENKIKAAEEAKKAEEDKKKAEEAKKAEEDEKKAAEALKKEAEEAKKaeelKKKEAEEKkkaeeLKKAEEENKIKAEEAKK 1737

                         410       420       430       440
                  ....*....|....*....|....*....|....*....|
gi 47717123   699 QEAQDKLGRLFHQHQEPAKPAVQAPWSTAEKGPLTISAQE 738
Cdd:PTZ00121 1738 EAEEDKKKAEEAKKDEEEKKKIAHLKKEEEKKAEEIRKEK 1777

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 68.98 E-value: 1.90e-14

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1158 CQVIgmYDYTAQNDDELAFNKGQIINVLnKEDPD-WWKGEVNGQVGLFPSNYV 1209
Cdd:cd11827    2 CKAL--YAYDAQDTDELSFNEGDIIEIL-KEDPSgWWTGRLRGKEGLFPGNYV 51

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 68.60 E-value: 3.19e-14

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11959    3 VALYDYQAADDDEISFDPDDIITNIEMIDEGWWRGVCRGKYGLFPANYVEL 53

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 67.78 E-value: 5.41e-14

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11824    5 LYDYTAQEDDELSISKGDVVAVIEKGEDGWWTVERNGQKGLVPGTYLEK 53

C2 domain fourth repeat present in Tricalbin-like proteins; 5 to 6 copies of the C2 domain are present in Tricalbin, a yeast homolog of Synaptotagmin, which is involved in membrane trafficking and sorting. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the fifth C2 repeat, C2E, and has a type-II topology.

Pssm-ID: 176005 [Multi-domain] Cd Length: 115 Bit Score: 69.90 E-value: 5.45e-14

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1598 LMVNVVEGIELKPCRSHGKSNPYCEVTM-GSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQFSPDDFLG 1676
Cdd:cd04040    1 LTVDVISAENLPSADRNGKSDPFVKFYLnGEKVFKTKTIKKTLNPVWNESFEVPVPSRVRAVLKVEVYDWDRGGKDDLLG 80


                 ....*....
gi 47717123 1677 RTEIRVADI 1685
Cdd:cd04040   81 SAYIDLSDL 89

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 67.56 E-value: 6.17e-14

                            10        20        30        40        50        60
                    ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    1075 KPEIAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELqargKKRQIGWFPANYVK 1134
Cdd:smart00326    1 EGPQVRALYDYTAQDPDELSFKKGDIITVLEKSDDGWWKGRL----GRGKEGLFPSNYVE 56

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 67.49 E-value: 7.09e-14

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGD-KAGVFPSNY 1054
Cdd:cd00174    2 ARALYDYEAQDDDELSFKKGDIITVLEKdDDGWWEGELNGgREGLFPANY 51

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 67.29 E-value: 7.36e-14

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11873    2 VIVEFDYDAEEPDELTLKVGDIITNVKKMEEGWWEGTLNGKRGMFPDNFVK 52

Src homology 3 domain of Endophilin-A; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain three endophilin-A isoforms (A1, A2, and A3). Endophilin-A proteins are enriched in the brain and play multiple roles in receptor-mediated endocytosis. They tubulate membranes and regulate calcium influx into neurons to trigger the activation of the endocytic machinery. They are also involved in the sorting of plasma membrane proteins, actin filament assembly, and the uncoating of clathrin-coated vesicles for fusion with endosomes. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212737 [Multi-domain] Cd Length: 55 Bit Score: 67.28 E-value: 7.41e-14

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11803    6 LYDFEPENEGELGFKEGDIITLTNQIDENWYEGMVNGQSGFFPVNYV 52

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 67.18 E-value: 8.27e-14

                            10        20        30        40        50        60
                    ....*....|....*....|....*....|....*....|....*....|....*....|...
gi 47717123     741 KVVYYRALYPFESRSHDEITIQPGDIVMVkgewVDESqtgEPGWLGGELK-GKTGWFPANYAE 802
Cdd:smart00326    1 EGPQVRALYDYTAQDPDELSFKKGDIITV----LEKS---DDGWWKGRLGrGKEGLFPSNYVE 56

Second C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212894 [Multi-domain] Cd Length: 53 Bit Score: 67.16 E-value: 8.41e-14

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11961    2 AKALYDYDAAEDNELSFFENDKIINIEFVDDDWWLGECHGSRGLFPSNYVEL 53

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 77.10 E-value: 1.05e-13

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   328 RLPEEPVLEDEQQQLEKKLPVTfEDKKRENFERGNLELEKRRqallEQQRKEQERLAQleRAEQERKERERQEQERKRQl 407
Cdd:PTZ00121 1284 KKAEEKKKADEAKKAEEKKKAD-EAKKKAEEAKKADEAKKKA----EEAKKKADAAKK--KAEEAKKAAEAAKAEAEAA- 1355

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   408 elEKQLEKQRELERQREEERRKEIERREAAKRELERQRQLEWERNRRQELLNQ----RNKEQEDIVVLKAKKKTLEFELE 483
Cdd:PTZ00121 1356 --ADEAEAAEEKAEAAEKKKEEAKKKADAAKKKAEEKKKADEAKKKAEEDKKKadelKKAAAAKKKADEAKKKAEEKKKA 1433

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   484 ALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRD 563
Cdd:PTZ00121 1434 DEAKKKAEEAKKADEAKKKAEEAKKAEEAKKKAEEAKKADEAKKKAEEAKKADEAKKKAEEAKKKADEAKKAAEAKKKAD 1513

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   564 SLVTLKRALEAKELARQHLRDQLDEVEK-ETRSKLQEIdifnNQLKELREIHNKQQLQKQKSME---------AERLKQK 633
Cdd:PTZ00121 1514 EAKKAEEAKKADEAKKAEEAKKADEAKKaEEKKKADEL----KKAEELKKAEEKKKAEEAKKAEedknmalrkAEEAKKA 1589

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   634 EQER-----KIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHqrpRKLHEEEKLKREESVKKKDGEEKGKQEAQDKLGRL 708
Cdd:PTZ00121 1590 EEARieevmKLYEEEKKMKAEEAKKAEEAKIKAEELKKAEEE---KKKVEQLKKKEAEEKKKAEELKKAEEENKIKAAEE 1666

                         410       420
                  ....*....|....*....|.
gi 47717123   709 FHQHQEPAKPAVQAPWSTAEK 729
Cdd:PTZ00121 1667 AKKAEEDKKKAEEAKKAEEDE 1687

Src homology 3 domain of Slit-Robo GTPase Activating Protein 4; srGAP4, also called ARHGAP4, is highly expressed in hematopoietic cells and may play a role in lymphocyte differentiation. It is able to stimulate the GTPase activity of Rac1, Cdc42, and RhoA. In the nervous system, srGAP4 has been detected in differentiating neurites and may be involved in axon and dendritic growth. srGAPs are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212889 [Multi-domain] Cd Length: 55 Bit Score: 66.79 E-value: 1.44e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1157 VCQVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11956    1 EVEAVACFDYTGRTAQELSFKRGDVLLLHSKASSDWWRGEHNGMRGLIPHKYISV 55

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 66.50 E-value: 1.47e-13

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11805    4 ALYDFNPQEPGELEFRRGDIITVLDSsDPDWWKGELRGRVGIFPANYV 51

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 76.25 E-value: 1.75e-13

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    439 RELERQ---------------------RQLEWE---------RNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDK 488
Cdd:TIGR02168  196 NELERQlkslerqaekaerykelkaelRELELAllvlrleelREELEELQEELKEAEEELEELTAELQELEEKLEELRLE 275

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    489 KHQLEGKLQDIRCRLTTQRQEIEstnksrelriaeithlqqqlqesqqmlgRLIPEKQILNDQLKQVQQNSLHRD-SLVT 567
Cdd:TIGR02168  276 VSELEEEIEELQKELYALANEIS----------------------------RLEQQKQILRERLANLERQLEELEaQLEE 327

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    568 LKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHN--KQQLQKQKSMEAERLKQKEQERK-IIELEK 644
Cdd:TIGR02168  328 LESKLDELAEELAELEEKLEELKEELESLEAELEELEAELEELESRLEelEEQLETLRSKVAQLELQIASLNNeIERLEA 407

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    645 QKEEAQRRAQERDKQWLEHVQQEDEHQR-------PRKLHEEEKLK-----REESVKKKDGEEKGKQEAQDKLGRLFHQH 712
Cdd:TIGR02168  408 RLERLEDRRERLQQEIEELLKKLEEAELkelqaelEELEEELEELQeelerLEEALEELREELEEAEQALDAAERELAQL 487


                   .
gi 47717123    713 Q 713
Cdd:TIGR02168  488 Q 488

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 66.46 E-value: 1.86e-13

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12052    6 FDYKAQHEDELTITVGDIITKIKKDDGGWWEGEIKGRRGLFPDNFVR 52

Uncharacterized conserved protein YhaN, contains AAA domain [Function unknown];

Pssm-ID: 443752 [Multi-domain] Cd Length: 641 Bit Score: 75.19 E-value: 2.31e-13

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  335 LEDEQQQLEKKLPVTFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQL-ELEKQL 413
Cdd:COG4717  100 LEEELEELEAELEELREELEKLEKLLQLLPLYQELEALEAELAELPERLEELEERLEELRELEEELEELEAELaELQEEL 179

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  414 EKQRELERQREEERRKEierreaAKRELERQRQlewernRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLE 493
Cdd:COG4717  180 EELLEQLSLATEEELQD------LAEELEELQQ------RLAELEEELEEAQEELEELEEELEQLENELEAAALEERLKE 247

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  494 GK----LQDIRCRLTTQRQEIESTnksrELRIAEIThlQQQLQESQQMLGRLIPEKQILNDQLKQVQ----QNSLHRDSL 565
Cdd:COG4717  248 ARllllIAAALLALLGLGGSLLSL----ILTIAGVL--FLVLGLLALLFLLLAREKASLGKEAEELQalpaLEELEEEEL 321

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  566 VTLKRALEAK-ELARQHLRDQLDEVEkETRSKLQEIDIFNNQLKELREIHNKQQLQKQK--SMEAERLKQKEQERKIIEL 642
Cdd:COG4717  322 EELLAALGLPpDLSPEELLELLDRIE-ELQELLREAEELEEELQLEELEQEIAALLAEAgvEDEEELRAALEQAEEYQEL 400

                        330       340       350       360
                 ....*....|....*....|....*....|....*....|....*
gi 47717123  643 EKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHE-EEKLKREE 686
Cdd:COG4717  401 KEELEELEEQLEELLGELEELLEALDEEELEEELEElEEELEELE 445

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 65.95 E-value: 2.33e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQ-GQKGWFPKSY 965
Cdd:cd00174    1 YARALYDYEAQDDDELSFKKGDIITVLEKDDDgWWEGELNgGREGLFPANY 51

Src homology 3 domain of Src kinase-like Protein Tyrosine Kinases; Src subfamily members include Src, Lck, Hck, Blk, Lyn, Fgr, Fyn, Yrk, Yes, and Brk. Src (or c-Src) proteins are cytoplasmic (or non-receptor) PTKs which are anchored to the plasma membrane. They contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation sites. Src proteins are involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. They were identified as the first proto-oncogene products, and they regulate cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Src kinases are overexpressed in a variety of human cancers, making them attractive targets for therapy. They are also implicated in acute inflammatory responses and osteoclast function. Src, Fyn, Yes, and Yrk are widely expressed, while Blk, Lck, Hck, Fgr, Lyn, and Brk show a limited expression pattern. This subfamily also includes Drosophila Src42A, Src oncogene at 42A (also known as Dsrc41) which accumulates at sites of cell-cell or cell-matrix adhesion, and participates in Drosphila development and wound healing. It has been shown to promote tube elongation in the tracheal system, is essential for proper cell-cell matching during dorsal closure, and regulates cell-cell contacts in developing Drosophila eyes. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212779 [Multi-domain] Cd Length: 52 Bit Score: 65.68 E-value: 2.45e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGE--VNGQVGLFPSNY 1208
Cdd:cd11845    1 IYVALYDYEARTDDDLSFKKGDRLQILDDSDGDWWLARhlSTGKEGYIPSNY 52

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 65.80 E-value: 2.61e-13

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQ---VGLFPSNY 1208
Cdd:cd11821    5 LYDCQADNDDELTFSEGEIIVVTGEEDDEWWEGHIEGDpsrRGVFPVSF 53

Family of unknown function (DUF5401); This is a family of unknown function found in Chromadorea.

Pssm-ID: 375164 [Multi-domain] Cd Length: 722 Bit Score: 75.16 E-value: 3.00e-13

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    324 SVDQRLPEEPVLEDEQQQLEKKLpvtfEDKKRENFERGNL-ELEKRRQALLEQQRK---EQERLA-----QLERAEQERK 394
Cdd:pfam17380  283 AVSERQQQEKFEKMEQERLRQEK----EEKAREVERRRKLeEAEKARQAEMDRQAAiyaEQERMAmererELERIRQEER 358

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    395 ERErqeQERKRQLELEKQLEKQrelerqreeerrkeierreaakRELERqrqLEWERNRRQELLNQrnkeqedivvlkak 474
Cdd:pfam17380  359 KRE---LERIRQEEIAMEISRM----------------------RELER---LQMERQQKNERVRQ-------------- 396

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    475 kktlefELEALNDKKHQLEGKLQDIRcrltTQRQEIESTNKSRElriaeithlqqqlqesqqmlgrlipekqilndQLKQ 554
Cdd:pfam17380  397 ------ELEAARKVKILEEERQRKIQ----QQKVEMEQIRAEQE--------------------------------EARQ 434

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    555 VQQNSLHRDSLVTLKRALEaKELARQHLRDQLDEVEKETRSKLQEIDifnnqlkelREIHNKQQLQKQKSMEAERlKQKE 634
Cdd:pfam17380  435 REVRRLEEERAREMERVRL-EEQERQQQVERLRQQEEERKRKKLELE---------KEKRDRKRAEEQRRKILEK-ELEE 503

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    635 QERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKREESVKKKDGEEKGKQEAQDKLGRLFHQHQE 714
Cdd:pfam17380  504 RKQAMIEEERKRKLLEKEMEERQKAIYEEERRREAEEERRKQQEMEERRRIQEQMRKATEERSRLEAMEREREMMRQIVE 583

                          410
                   ....*....|..
gi 47717123    715 PAKPAVQAPWST 726
Cdd:pfam17380  584 SEKARAEYEATT 595

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 75.10 E-value: 3.18e-13

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    350 FEDKKRENFErgnlELEKRRQALLEQQRKEQERLAQLERAEQER--KERERQEQERKRQLEL-EKQLEKQRELERQREEE 426
Cdd:TIGR02169  168 FDRKKEKALE----ELEEVEENIERLDLIIDEKRQQLERLRRERekAERYQALLKEKREYEGyELLKEKEALERQKEAIE 243

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    427 RRKEIERREAAKRELERQrQLEWERNRRQELLNQRNKE-----QEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDirc 501
Cdd:TIGR02169  244 RQLASLEEELEKLTEEIS-ELEKRLEEIEQLLEELNKKikdlgEEEQLRVKEKIGELEAEIASLERSIAEKERELED--- 319

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    502 rLTTQRQEIESTNKSRELRIAEIThlqqqlqesqqmlgRLIPEKQILNDQLKQVQQNSlhRDSLVTLKRALEAKELARQH 581
Cdd:TIGR02169  320 -AEERLAKLEAEIDKLLAEIEELE--------------REIEEERKRRDKLTEEYAEL--KEELEDLRAELEEVDKEFAE 382

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    582 LRDQLDEVEKetrsklqEIDIFNNQLKEL-REIHNKQQLQKQKSMEAERLKQK-------------EQERKIIELEKQKE 647
Cdd:TIGR02169  383 TRDELKDYRE-------KLEKLKREINELkRELDRLQEELQRLSEELADLNAAiagieakineleeEKEDKALEIKKQEW 455

                          330       340       350
                   ....*....|....*....|....*....|....*...
gi 47717123    648 EAQRRAQERDKQWLEHVQQEDEHQRPRKlhEEEKLKRE 685
Cdd:TIGR02169  456 KLEQLAADLSKYEQELYDLKEEYDRVEK--ELSKLQRE 491

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 75.18 E-value: 3.78e-13

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   351 EDKKRENfERGNLELEKRRQALLEQQRKEQERLAQLER-AEQERK--ERERQEQERKRQLELEKQLEK-----QRELERQ 422
Cdd:PTZ00121 1402 EDKKKAD-ELKKAAAAKKKADEAKKKAEEKKKADEAKKkAEEAKKadEAKKKAEEAKKAEEAKKKAEEakkadEAKKKAE 1480

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   423 REEERRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKEQEDiVVLKAKKKTLEFELEALNDKKHQLEGKLQDiRCR 502
Cdd:PTZ00121 1481 EAKKADEAKKKAEEAKKKADEAKKAAEAKKKADEAKKAEEAKKAD-EAKKAEEAKKADEAKKAEEKKKADELKKAE-ELK 1558

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   503 LTTQRQEIESTNKSRE-----LRIAEITHLQQQLQESQQMLgRLIPEKQILNDQLKQVQQNSLHRDSLvtlKRALEAKEL 577
Cdd:PTZ00121 1559 KAEEKKKAEEAKKAEEdknmaLRKAEEAKKAEEARIEEVMK-LYEEEKKMKAEEAKKAEEAKIKAEEL---KKAEEEKKK 1634

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   578 ARQHLRDQLDEVEK--ETRSKLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKiiELEKQKEEAQRRAQE 655
Cdd:PTZ00121 1635 VEQLKKKEAEEKKKaeELKKAEEENKIKAAEEAKKAEEDKKKAEEAKKAEEDEKKAAEALKKE--AEEAKKAEELKKKEA 1712

                         330       340       350       360       370       380       390
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 47717123   656 RDKQWLEHVQQEDEHqrpRKLHEEEKLKREESVKKKDGEEKGKQEAQDKLGRLFHQHQEPAKPAVQAPWSTAEKG 730
Cdd:PTZ00121 1713 EEKKKAEELKKAEEE---NKIKAEEAKKEAEEDKKKAEEAKKDEEEKKKIAHLKKEEEKKAEEIRKEKEAVIEEE 1784

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 65.41 E-value: 3.81e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVN-GQVGLFPSNYVKL 1211
Cdd:cd11819    3 KALYDYQAAEDNEISFVEGDIITQIEQIDEGWWLGVNAkGQKGLFPANYVEL 54

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 65.44 E-value: 4.18e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11781    3 RALYPFKAQSAKELSLKKGDIIYIRRQIDKNWYEGEHNGRVGIFPASYVEI 53

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 74.79 E-value: 4.55e-13

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   326 DQRLPEEPVLEDEQQQLEKKLPVTFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERE-RQEQERK 404
Cdd:PTZ00121 1455 EAKKAEEAKKKAEEAKKADEAKKKAEEAKKADEAKKKAEEAKKKADEAKKAAEAKKKADEAKKAEEAKKADEaKKAEEAK 1534

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   405 RQLELEKQLEKQRELERQREEERRKEIErreaaKRELERQRQLEWERN---RRQELLNQRNKEQ-EDIVVLKAKKKTLEF 480
Cdd:PTZ00121 1535 KADEAKKAEEKKKADELKKAEELKKAEE-----KKKAEEAKKAEEDKNmalRKAEEAKKAEEARiEEVMKLYEEEKKMKA 1609

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   481 E----LEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEithlqqqlqesqqmlgrliPEKQILNDQLKqvq 556
Cdd:PTZ00121 1610 EeakkAEEAKIKAEELKKAEEEKKKVEQLKKKEAEEKKKAEELKKAE-------------------EENKIKAAEEA--- 1667

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   557 qnslhrdslvtlKRALEAKELARQHLRDQLDEVEKETRSKLQEidifnNQLKELREIHNKQQLQKQKsmeAERLKQKEQE 636
Cdd:PTZ00121 1668 ------------KKAEEDKKKAEEAKKAEEDEKKAAEALKKEA-----EEAKKAEELKKKEAEEKKK---AEELKKAEEE 1727

                         330       340       350       360       370
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123   637 RKII--ELEKQKEEAQRRAQ-----ERDKQWLEHVQQEDEHQRPRKLHEEEKLKREE 686
Cdd:PTZ00121 1728 NKIKaeEAKKEAEEDKKKAEeakkdEEEKKKIAHLKKEEEKKAEEIRKEKEAVIEEE 1784

Trichohyalin-plectin-homology domain; This family is a mixtrue of two different families of eukaryotic proteins. Trichoplein or mitostatin, was first defined as a meiosis-specific nuclear structural protein. It has since been linked with mitochondrial movement. It is associated with the mitochondrial outer membrane, and over-expression leads to reduction in mitochondrial motility whereas lack of it enhances mitochondrial movement. The activity appears to be mediated through binding the mitochondria to the actin intermediate filaments (IFs). The family is in the trichohyalin-plectin-homology domain.

Pssm-ID: 464007 [Multi-domain] Cd Length: 341 Bit Score: 72.64 E-value: 4.56e-13

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    363 LELEKRRQALLEQQRKEQERLAQLER----AEQERKERERQEQERKRQLELEKQLEKQRELERQREEERRKEIERREAAK 438
Cdd:pfam13868   28 IAEKKRIKAEEKEEERRLDEMMEEEReralEEEEEKEEERKEERKRYRQELEEQIEEREQKRQEEYEEKLQEREQMDEIV 107

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    439 RELERQRQLEWERNRRQELLNQRnkEQEDIVVLKAKKKTLEFELEALNDKKhqlegKLQDIRcrlttQRQEIESTNKSRE 518
Cdd:pfam13868  108 ERIQEEDQAEAEEKLEKQRQLRE--EIDEFNEEQAEWKELEKEEEREEDER-----ILEYLK-----EKAEREEEREAER 175

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    519 LRIAEithlqqqlqesqqmlgrlipEKQILNDQL-KQVQQNSLHRDSLVTLKRALEAKELARQHLRDQLDEVEKETRskl 597
Cdd:pfam13868  176 EEIEE--------------------EKEREIARLrAQQEKAQDEKAERDELRAKLYQEEQERKERQKEREEAEKKAR--- 232

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    598 QEIDIFNNQLKELREIHNKQQLQKQKsMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEhvQQEDEHQRPRKLH 677
Cdd:pfam13868  233 QRQELQQAREEQIELKERRLAEEAER-EEEEFERMLRKQAEDEEIEQEEAEKRRMKRLEHRRELE--KQIEEREEQRAAE 309


                   ....*....
gi 47717123    678 EEEKLKREE 686
Cdd:pfam13868  310 REEELEEGE 318

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 65.23 E-value: 4.74e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKE-----DPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11876    5 LFDYDARGEDELTLRRGQPVEVLSKDaavsgDEGWWTGKIGDKVGIFPSNYV 56

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 65.11 E-value: 4.88e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILV---TKKDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11841    4 ALYSFEGQQPCDLSFQAGDRITVltrTDSQFDWWEGRLRGRVGIFPANYV 53

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 65.09 E-value: 4.91e-13

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12061    6 FNFQQTNEDELSFSKGDVIHVTRVEEGGWWEGTHNGRTGWFPSNYVR 52

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 65.06 E-value: 4.97e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11823    3 KALYSYTANREDELSLQPGDIIEV-------HEKQDDGWWLGELNGKKGIFPATYVE 52

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 64.92 E-value: 6.28e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123   1157 VCQVIGmyDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:pfam07653    1 YGRVIF--DYVGTDKNGLTLKKGDVVKVLGKDNDGWWEGETGGRVGLVPSTAVEE 53

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212777 [Multi-domain] Cd Length: 53 Bit Score: 64.75 E-value: 6.31e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPD-WWKGEVNGQVGLFPSNYV 1209
Cdd:cd11843    2 VRALYDYEGQESDELSFKAGDILTKLEEEDEQgWCKGRLDGRVGLYPANYV 52

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 64.41 E-value: 7.53e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1078 IAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQargkKRQIGWFPANY 1132
Cdd:cd00174    1 YARALYDYEAQDDDELSFKKGDIITVLEKDDDGWWEGELN----GGREGLFPANY 51

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 64.47 E-value: 7.74e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1157 VCQViGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKLT 1212
Cdd:cd12073    1 ICAV-ALYDYQGEGDDEISFDPQETITDIEMVDEGWWKGTCHGHRGLFPANYVELL 55

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 64.31 E-value: 8.20e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDpDWWKGEV-NGQVGLFPSNYVKL 1211
Cdd:cd11837    1 TATALYPWRAKKENHLSFAKGDIITVLEQQE-MWWFGELeGGEEGWFPKSYVKE 53

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 64.34 E-value: 9.39e-13

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDP--DWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11841    1 EVTALYSFEGQQPCDLSFQAGDRITVLTRTDSqfDWWEGRLRGRVGIFPANYVS 54

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. Its N-terminal SH3 domain binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212879 [Multi-domain] Cd Length: 56 Bit Score: 64.28 E-value: 1.09e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKE-DPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11946    2 EAIAKYDFKATADDELSFKRGDILKVLNEEcDQNWYKAELNGKDGFIPKNYIEM 55

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 63.87 E-value: 1.14e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11877    4 AKFNFEGTNEDELSFDKGDIITVTQVvEGGWWEGTLNGKTGWFPSNYVKE 53

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 64.26 E-value: 1.18e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11972    4 KVVAIYDYTKDKEDELSFQEGAIIYVIKKNDDGWYEGVMNGVTGLFPGNYVE 55

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 63.97 E-value: 1.28e-12

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11840    3 IALFPYTAQNEDELSFQKGDIInVLSKDDPDWWRGELNGQTGLFPSNYV 51

Src homology 3 domain of Abl Interactor 1; Abi1, also called e3B1, is a central regulator of actin cytoskeletal reorganization through interactions with many protein complexes. It is part of WAVE, a nucleation-promoting factor complex, that links Rac 1 activation to actin polymerization causing lamellipodia protrusion at the plasma membrane. Abi1 interact with formins to promote protrusions at the leading edge of motile cells. It also is a target of alpha4 integrin, regulating membrane protrusions at sites of integrin engagement. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212904 [Multi-domain] Cd Length: 59 Bit Score: 63.89 E-value: 1.40e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11971    1 KVVAIYDYSKDKDDELSFMEGAIIYVIKKNDDGWYEGVCNGVTGLFPGNYVE 52

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 63.83 E-value: 1.45e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1158 CQVigMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12054    3 CKV--LFEYVPQNEDELELKVGDIIDINEEVEEGWWSGTLNGKSGLFPSNFVK 53

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 63.69 E-value: 1.55e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKE--DPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd12056    7 LFHYEGTNEDELDFKEGEIILIISKDtgEPGWWKGELNGKEGVFPDNFVSQ 57

Second Src Homology 3 domain of FCH and double SH3 domains protein 2; FCHSD2 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212827 Cd Length: 56 Bit Score: 63.80 E-value: 1.58e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPD---WWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11894    2 VKALYDYEGQTDDELSFPEGAIIRILNKENQDddgFWEGEFNGRIGVFPSVLVE 55

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 63.52 E-value: 1.60e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQ-DMWWFGEVQGQKGWFPKSYV 966
Cdd:cd11823    1 RCKALYSYTANREDELSLQPGDIIEVHEKQdDGWWLGELNGKKGIFPATYV 51

C2 domain third repeat found in Multiple C2 domain and Transmembrane region Proteins (MCTP); MCTPs are involved in Ca2+ signaling at the membrane. The cds in this family contain multiple C2 domains as well as a C-terminal PRT domain. It is one of four protein classes that are anchored to membranes via a transmembrane region; the others being synaptotagmins, extended synaptotagmins, and ferlins. MCTPs are the only membrane-bound C2 domain proteins that contain two functional TMRs. MCTPs are unique in that they bind Ca2+ but not phospholipids. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the third C2 repeat, C2C, and has a type-II topology.

Pssm-ID: 176023 [Multi-domain] Cd Length: 119 Bit Score: 65.40 E-value: 2.18e-12

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQeVLCITVFERDQFSPDDFL 1675
Cdd:cd08377    1 GFLQVKVIRASGLAAADIGGKSDPFCVLELVNARLQTHTIYKTLNPEWNKIFTFPIKDIHD-VLEVTVYDEDKDKKPEFL 79

                         90
                 ....*....|.
gi 47717123 1676 GRTEIRVADIK 1686
Cdd:cd08377   80 GKVAIPLLSIK 90

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 63.09 E-value: 2.75e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVT-KKDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11772    2 FRALYDYEAQHPDELSFEEGDLLYISdKSDPNWWKATCGGKTGLIPSNYV 51

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 62.48 E-value: 4.31e-12

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                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKE-----DPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd12059    5 VFDYEASAEDELTLRRGDRVEVLSKDsavsgDEGWWTGKINDRVGIFPSNYV 56

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 62.71 E-value: 4.32e-12

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                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12060    8 FNFKQTNEDELSVCKGDIIYVTRVEEGGWWEGTLNGKTGWFPSNYVR 54

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 71.25 E-value: 4.64e-12

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   330 PEEPVLEDEQQQLEK------KLPVTFEDKKRENFER-GNL--------ELEKRRQALLEQQRKEQERLAQLERAEQERK 394
Cdd:PRK03918  214 SELPELREELEKLEKevkeleELKEEIEELEKELESLeGSKrkleekirELEERIEELKKEIEELEEKVKELKELKEKAE 293

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   395 ERERQEQERKRQLELEKQLEKQRELERQREEERRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKEQEDIVVLKA- 473
Cdd:PRK03918  294 EYIKLSEFYEEYLDELREIEKRLSRLEEEINGIEERIKELEEKEERLEELKKKLKELEKRLEELEERHELYEEAKAKKEe 373

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   474 -----KKKT------LEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKS-RELRIAEITHLQQQLQESQQMLGRL 541
Cdd:PRK03918  374 lerlkKRLTgltpekLEKELEELEKAKEEIEEEISKITARIGELKKEIKELKKAiEELKKAKGKCPVCGRELTEEHRKEL 453

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   542 IPE-----KQILNDQLKQVQQNSLHRDSLVTLKRAL-EAKELARQH-LRDQLDEVEKETRS-KLQEIDIFNNQLKELREI 613
Cdd:PRK03918  454 LEEytaelKRIEKELKEIEEKERKLRKELRELEKVLkKESELIKLKeLAEQLKELEEKLKKyNLEELEKKAEEYEKLKEK 533

                         330       340       350       360       370       380       390
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|..
gi 47717123   614 HNKQQlQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQwLEHVQQEDEHQRPRKLHEEEKLKRE 685
Cdd:PRK03918  534 LIKLK-GEIKSLKKELEKLEELKKKLAELEKKLDELEEELAELLKE-LEELGFESVEELEERLKELEPFYNE 603

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 62.13 E-value: 5.24e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12046    1 QVVALFSYEASQPEDLEFQKGDVILVLSKVNEDWLEGQCKGKIGIFPSAFVE 52

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 61.99 E-value: 5.42e-12

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11786    4 ALYNYEGKEPGDLSFKKGDIILLRKRiDENWYHGECNGKQGFFPASYV 51

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 61.95 E-value: 5.43e-12

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11826    3 VALYDYTADKDDELSFQEGDIIYVTKKNDDgWYEGVLNGVTGLFPGNYV 51

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 62.09 E-value: 5.72e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKD----GD--WWTGTVGDKAGVFPSNYVR 1056
Cdd:cd12059    4 AVFDYEASAEDELTLRRGDRVEVLSKDsavsGDegWWTGKINDRVGIFPSNYVT 57

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 61.86 E-value: 5.80e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123    747 ALYPFESRSHDEITIQPGDIVMVKGEwvdesqtGEPGWLGGELKGKTGWFPANYAE 802
Cdd:pfam14604    1 ALYPYEPKDDDELSLQRGDVITVIEE-------SEDGWWEGINTGRTGLVPANYVE 49

Third Src homology 3 domain (or SH3C) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. The SH3C of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212772 [Multi-domain] Cd Length: 52 Bit Score: 62.05 E-value: 5.84e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVlNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11838    3 IALYPYESNEPGDLTFNAGDVILV-TKKDGEWWTGTIGDRTGIFPSNYVRP 52

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 70.94 E-value: 7.57e-12

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   351 EDKKRENFERGNLELEK----------RRQALL--EQQRKEQErlaqLERAEQERKERE-RQEQERKRQLELEKQLEKQR 417
Cdd:PTZ00121 1240 EEAKKAEEERNNEEIRKfeearmahfaRRQAAIkaEEARKADE----LKKAEEKKKADEaKKAEEKKKADEAKKKAEEAK 1315

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   418 ELERQREEERRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKEQEdivvlkaKKKTLEFELEALNDKKHQLEGKLQ 497
Cdd:PTZ00121 1316 KADEAKKKAEEAKKKADAAKKKAEEAKKAAEAAKAEAEAAADEAEAAEE-------KAEAAEKKKEEAKKKADAAKKKAE 1388

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   498 DIRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQmlgrlipEKQILNDQLKQVQQNSlhrdslvtlKRALEAKEL 577
Cdd:PTZ00121 1389 EKKKADEAKKKAEEDKKKADELKKAAAAKKKADEAKKKA-------EEKKKADEAKKKAEEA---------KKADEAKKK 1452

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   578 ARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKsmeAERLKQKEQERKIIELEKQKEEAQ-----RR 652
Cdd:PTZ00121 1453 AEEAKKAEEAKKKAEEAKKADEAKKKAEEAKKADEAKKKAEEAKKK---ADEAKKAAEAKKKADEAKKAEEAKkadeaKK 1529

                         330       340       350
                  ....*....|....*....|....*....|....*.
gi 47717123   653 AQERDKQwlEHVQQEDEHQRPRKLHEEEKLKREESV 688
Cdd:PTZ00121 1530 AEEAKKA--DEAKKAEEKKKADELKKAEELKKAEEK 1563

Third Src Homology 3 domain of Nck adaptor proteins; This group contains the third SH3 domain of Nck, the first SH3 domain of Caenorhabditis elegans Ced-2 (Cell death abnormality protein 2), and similar domains. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. Ced-2 is a cell corpse engulfment protein that interacts with Ced-5 in a pathway that regulates the activation of Ced-10, a Rac small GTPase.

Pssm-ID: 212701 [Multi-domain] Cd Length: 56 Bit Score: 61.56 E-value: 8.71e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNK--EDPDWWKGE-VNGQVGLFPSNYVKL 1211
Cdd:cd11767    2 VVALYPFTGENDEELSFEKGERLEIIEKpeDDPDWWKARnALGTTGLVPRNYVEV 56

Third Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212837 [Multi-domain] Cd Length: 57 Bit Score: 61.58 E-value: 8.93e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNK--EDPDWWK-GEVNGQVGLFPSNYVKL 1211
Cdd:cd11904    3 VQALYPFSSSNDEELNFEKGEVMDVIEKpeNDPEWWKcRKANGQVGLVPKNYVTV 57

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 61.76 E-value: 9.52e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKD----GD--WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11876    4 ALFDYDARGEDELTLRRGQPVEVLSKDaavsGDegWWTGKIGDKVGIFPSNYV 56

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 61.49 E-value: 9.71e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKE-DPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11830    3 KARYDFCARDMRELSLKEGDVVKIYNKKgQQGWWRGEINGRIGWFPSTYVE 53

Second Src Homology 3 domain (SH3B) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CIN85. SH3B has been shown to bind Cbl proline-rich peptides and ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212988 [Multi-domain] Cd Length: 53 Bit Score: 61.55 E-value: 9.82e-12

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1158 CQVigMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12055    2 CQV--AFSYLPQNEDELELKVGDIIEVVGEVEEGWWEGVLNGKTGMFPSNFIK 52

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 61.54 E-value: 1.00e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1158 CQVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGL-FPSNYVK 1210
Cdd:cd11970    4 CAVKALFDYKAQREDELTFTKNAIIQNVEKQEGGWWRGDYGGKKQLwFPSNYVE 57

Src homology 3 domain of Slit-Robo GTPase Activating Proteins; Slit-Robo GTPase Activating Proteins (srGAPs) are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. Vertebrates contain three isoforms of srGAPs (srGAP1-3), all of which are expressed during embryonic and early development in the nervous system but with different localization and timing. A fourth member has also been reported (srGAP4, also called ARHGAP4). srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212743 [Multi-domain] Cd Length: 53 Bit Score: 61.26 E-value: 1.25e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11809    3 TAQFDYTGRSERELSFKKGDSLTLYRQVSDDWWRGQLNGQDGLVPHKYITL 53

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 60.79 E-value: 1.39e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1078 IAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARgkkrqIGWFPANYVKL 1135
Cdd:cd11877    1 LVRAKFNFEGTNEDELSFDKGDIITVTQVVEGGWWEGTLNGK-----TGWFPSNYVKE 53

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 60.94 E-value: 1.48e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKgewvdesQTGEPGWLGGEL-KGKTGWFPANY 800
Cdd:cd00174    1 YARALYDYEAQDDDELSFKKGDIITVL-------EKDDDGWWEGELnGGREGLFPANY 51

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 60.73 E-value: 1.56e-11

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPD-WWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11976    6 YDFCARDRSELSLKEGDIIKILNKKGQQgWWRGEIYGRVGWFPANYVE 53

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase and similar proteins; This subfamily is composed of Rho GTPase activating proteins (GAPs) with similarity to GRAF. Members contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. Although vertebrates harbor four Rho GAPs in the GRAF subfamily including GRAF, GRAF2, GRAF3, and Oligophrenin-1 (OPHN1), only three are included in this model. OPHN1 contains the BAR, PH and GAP domains, but not the C-terminal SH3 domain. GRAF and GRAF2 show GAP activity towards RhoA and Cdc42. GRAF influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase. GRAF2 regulates caspase-activated p21-activated protein kinase-2. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212815 [Multi-domain] Cd Length: 54 Bit Score: 60.77 E-value: 1.66e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQII-NVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11882    1 RARALYACKAEDESELSFEPGQIItNVQPSDEPGWLEGTLNGRTGLIPENYVEF 54

Src homology 3 domain of Phospholipase C (PLC) gamma 2; PLCgamma2 is primarily expressed in haematopoietic cells, specifically in B cells. It is activated by tyrosine phosphorylation by B cell receptor (BCR) kinases and is recruited to the plasma membrane where its substrate is located. It is required in pre-BCR signaling and in the maturation of B cells. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212902 Cd Length: 55 Bit Score: 60.62 E-value: 1.67e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVG-LFPSNYVK 1210
Cdd:cd11969    2 VKALYDYRAKRSDELSFCKGALIHNVSKETGGWWKGDYGGKVQhYFPSNYVE 53

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 69.62 E-value: 1.71e-11

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    366 EKRRQALLE------QQRKEQERLAQLERAEQERKERERQEQERKRQLELEKQLEKQrelerqreeerRKEIERREAAKR 439
Cdd:pfam02463  152 PERRLEIEEeaagsrLKRKKKEALKKLIEETENLAELIIDLEELKLQELKLKEQAKK-----------ALEYYQLKEKLE 220

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    440 ELERQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKK---TLEFELEALNDKKHQLEGKLQDIrcrlttQRQEIESTNKS 516
Cdd:pfam02463  221 LEEEYLLYLDYLKLNEERIDLLQELLRDEQEEIESSKqeiEKEEEKLAQVLKENKEEEKEKKL------QEEELKLLAKE 294

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    517 RELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRD---SLVTLKRALEAKE---------LARQHLRD 584
Cdd:pfam02463  295 EEELKSELLKLERRKVDDEEKLKESEKEKKKAEKELKKEKEEIEELEkelKELEIKREAEEEEeeeleklqeKLEQLEEE 374

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    585 QLDEVEKETRSKLQEIDIFNNQL----KELREIHNKQQLQKQKSMEAERLKQKEqERKIIELEKQKEEAQRRAQERdkqw 660
Cdd:pfam02463  375 LLAKKKLESERLSSAAKLKEEELelksEEEKEAQLLLELARQLEDLLKEEKKEE-LEILEEEEESIELKQGKLTEE---- 449

                          330       340
                   ....*....|....*....|....*.
gi 47717123    661 lEHVQQEDEHQRPRKLHEEEKLKREE 686
Cdd:pfam02463  450 -KEELEKQELKLLKDELELKKSEDLL 474

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 69.78 E-value: 1.76e-11

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   326 DQRLPEEPVLEDEQQQLEKKLPVtfEDKKRENFERgnlELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKR 405
Cdd:PTZ00121 1126 DARKAEEARKAEDARKAEEARKA--EDAKRVEIAR---KAEDARKAEEARKAEDAKKAEAARKAEEVRKAEELRKAEDAR 1200

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   406 QLELEKQLEKQRELERQREEERrkeierreaaKRELERQRQLEWERNRRQEllnQRNKEQEDIVVLKAKKKTLEFELEAL 485
Cdd:PTZ00121 1201 KAEAARKAEEERKAEEARKAED----------AKKAEAVKKAEEAKKDAEE---AKKAEEERNNEEIRKFEEARMAHFAR 1267

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   486 NDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRDSL 565
Cdd:PTZ00121 1268 RQAAIKAEEARKADELKKAEEKKKADEAKKAEEKKKADEAKKKAEEAKKADEAKKKAEEAKKKADAAKKKAEEAKKAAEA 1347

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   566 VTLKRALEAKELARQHLRDQLDEVEK-ETRSKLQEIDIFNNQLKELREIHNKQQLQKQKsmeAERLKQKEQERKIIELEK 644
Cdd:PTZ00121 1348 AKAEAEAAADEAEAAEEKAEAAEKKKeEAKKKADAAKKKAEEKKKADEAKKKAEEDKKK---ADELKKAAAAKKKADEAK 1424

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   645 QKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKREESVKKKDGEEKGKQEAQDKLGRLFHQHQEPAKPAVQAPW 724
Cdd:PTZ00121 1425 KKAEEKKKADEAKKKAEEAKKADEAKKKAEEAKKAEEAKKKAEEAKKADEAKKKAEEAKKADEAKKKAEEAKKKADEAKK 1504


                  ....*
gi 47717123   725 STAEK 729
Cdd:PTZ00121 1505 AAEAK 1509

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 60.49 E-value: 1.80e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEV-NGQVGLFPSNYVKL 1211
Cdd:cd11960    5 LYDYQAADDTEISFDPGDIITDIEQIDEGWWRGTGpDGTYGLFPANYVEL 54

Second Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the second C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212712 [Multi-domain] Cd Length: 51 Bit Score: 60.59 E-value: 1.99e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLnKEDP--DWWKGEVNGQVGLFPSNY 1208
Cdd:cd11778    2 VEALYDYEAQGDDEISIRVGDRIAVI-RGDDgsGWTYGEINGVKGLFPTSY 51

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 69.23 E-value: 2.11e-11

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    323 TSVDQRLPEEPVLEDEQQQLEKKLPVTFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQE 402
Cdd:pfam02463  652 VSLEEGLAEKSEVKASLSELTKELLEIQELQEKAESELAKEEILRRQLEIKKKEQREKEELKKLKLEAEELLADRVQEAQ 731

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    403 RKRQLELEKQLEKQRELERQREEERRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKE------QEDIVVLKAKKK 476
Cdd:pfam02463  732 DKINEELKLLKQKIDEEEEEEEKSRLKKEEKEEEKSELSLKEKELAEEREKTEKLKVEEEKEeklkaqEEELRALEEELK 811

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    477 TLEFELEALNDKKHQLEGKLQDIRCRlttQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLipEKQILNDQLKQVQ 556
Cdd:pfam02463  812 EEAELLEEEQLLIEQEEKIKEEELEE---LALELKEEQKLEKLAEEELERLEEEITKEELLQELL--LKEEELEEQKLKD 886

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    557 QNSLHRDSLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELReihnkqqLQKQKSMEAERLKQKEQE 636
Cdd:pfam02463  887 ELESKEEKEKEEKKELEEESQKLNLLEEKENEIEERIKEEAEILLKYEEEPEELL-------LEEADEKEKEENNKEEEE 959

                          330       340       350       360       370
                   ....*....|....*....|....*....|....*....|....*....|.
gi 47717123    637 RKIIELEKQKEEAQRRaqerdkqwlehvqqeDEHQRPRKLHEEEKLKREES 687
Cdd:pfam02463  960 ERNKRLLLAKEELGKV---------------NLMAIEEFEEKEERYNKDEL 995

Third Src homology 3 domain (or SH3C) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212924 Cd Length: 52 Bit Score: 60.38 E-value: 2.24e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIInVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11991    1 EYVAMYTYESNEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKTGVFPSNYVRP 52

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 60.34 E-value: 2.33e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKE-----DPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd12058    5 LYDYEASGEDELSLRRGDVVEVLSQDaavsgDDGWWAGKIRHRLGIFPANYV 56

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 60.41 E-value: 2.45e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11877    2 VRAKFNFEGTNEDELSFDKGDIITV-------TQVVEGGWWEGTLNGKTGWFPSNYVK 52

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 59.74 E-value: 3.18e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQD-MWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11840    1 QVIALFPYTAQNEDELSFQKGDIINVLSKDDpDWWRGELNGQTGLFPSNYVEP 53

First Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212707 [Multi-domain] Cd Length: 57 Bit Score: 59.75 E-value: 3.58e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWK-------GEVNGQVGLFPSNY 1208
Cdd:cd11773    5 LYDYEPQTEDELTIQEDDILYLLEKSDDDWWKvklkvnsSDDDEPVGLVPATY 57

Synaptonemal complex protein 1 (SCP-1); Synaptonemal complex protein 1 (SCP-1) is the major component of the transverse filaments of the synaptonemal complex. Synaptonemal complexes are structures that are formed between homologous chromosomes during meiotic prophase.

Pssm-ID: 114219 [Multi-domain] Cd Length: 787 Bit Score: 68.21 E-value: 4.29e-11

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    332 EPVLEDEQQQLEK-----KLPVTFEDKKRENFER-------GNLELEKRRQALLEQQRKEQERlAQLERAEQERKERERQ 399
Cdd:pfam05483  362 EELLRTEQQRLEKnedqlKIITMELQKKSSELEEmtkfknnKEVELEELKKILAEDEKLLDEK-KQFEKIAEELKGKEQE 440

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    400 E----QERKRQL-ELEKQLekqreleRQREEERRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKE---------- 464
Cdd:pfam05483  441 LifllQAREKEIhDLEIQL-------TAIKTSEEHYLKEVEDLKTELEKEKLKNIELTAHCDKLLLENKEltqeasdmtl 513

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    465 -----QEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIE-STNKSRElriaeitHLQQQLQESQQML 538
Cdd:pfam05483  514 elkkhQEDIINCKKQEERMLKQIENLEEKEMNLRDELESVREEFIQKGDEVKcKLDKSEE-------NARSIEYEVLKKE 586

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    539 GRLIPEKQILNDQLKQVQQNSLHRDSLVTLKRAL------EAKELARQHLRDQLDEVEKE-TRSKLQEI-DIFNNQL--K 608
Cdd:pfam05483  587 KQMKILENKCNNLKKQIENKNKNIEELHQENKALkkkgsaENKQLNAYEIKVNKLELELAsAKQKFEEIiDNYQKEIedK 666

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    609 ELREIHNKQQLQKQKSMEAERLK-QKEQER----KIIE----LEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEE 679
Cdd:pfam05483  667 KISEEKLLEEVEKAKAIADEAVKlQKEIDKrcqhKIAEmvalMEKHKHQYDKIIEERDSELGLYKNKEQEQSSAKAALEI 746

                          410       420
                   ....*....|....*....|....*...
gi 47717123    680 EKLKREESVKKKDGEEKGKQEAQDKLGR 707
Cdd:pfam05483  747 ELSNIKAELLSLKKQLEIEKEEKEKLKM 774

First C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212895 [Multi-domain] Cd Length: 54 Bit Score: 59.42 E-value: 4.87e-11

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWWKGE-VNGQVGLFPSNYVKL 1211
Cdd:cd11962    6 YDYEKDEDNEIELVEGEIVTNIEMVDEDWWMGTnSKGESGLFPSNYVEL 54

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 68.04 E-value: 4.96e-11

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  335 LEDEQQQLEKKLpvTFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLE--LEKQ 412
Cdd:COG1196  293 LLAELARLEQDI--ARLEERRRELEERLEELEEELAELEEELEELEEELEELEEELEEAEEELEEAEAELAEAEeaLLEA 370

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  413 LEKQRELERQReeerrkeierREAAKRELERQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQL 492
Cdd:COG1196  371 EAELAEAEEEL----------EELAEELLEALRAAAELAAQLEELEEAEEALLERLERLEEELEELEEALAELEEEEEEE 440

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  493 EGKLQDIRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQIlndqLKQVQQNSLHRDSLVTLKRAL 572
Cdd:COG1196  441 EEALEEAAEEEAELEEEEEALLELLAELLEEAALLEAALAELLEELAEAAARLLL----LLEAEADYEGFLEGVKAALLL 516

                        250       260
                 ....*....|....*....|..
gi 47717123  573 EAKELARQHLRDQLDEVEKETR 594
Cdd:COG1196  517 AGLRGLAGAVAVLIGVEAAYEA 538

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 59.22 E-value: 6.06e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1078 IAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGKKRQIGWFPANY 1132
Cdd:cd11883    1 VVVALYDFTPKSKNQLSFKAGDIIYVLNKDPSGWWDGVIISSSGKVKRGWFPSNY 55

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 59.19 E-value: 6.23e-11

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11856    5 IADYEAQGDDEISLQEGEVVEVLEKNDSGWWYVRKGDKEGWVPASYLE 52

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 59.22 E-value: 6.49e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQV-----GLFPSNY 1208
Cdd:cd11883    2 VVALYDFTPKSKNQLSFKAGDIIYVLNKDPSGWWDGVIISSSgkvkrGWFPSNY 55

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 59.28 E-value: 6.71e-11

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11901    8 FNYTAEREDELSLVKGTKVIVMEKCSDGWWRGSYNGQVGWFPSNYV 53

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 58.88 E-value: 7.21e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPD-WWKGE-VNGQVGLFPSNYV 1209
Cdd:cd11763    1 KVRALYDFDSQPSGELSLRAGEVLTITRQDVGDgWLEGRnSRGEVGLFPSSYV 53

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 58.91 E-value: 7.37e-11

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11786    5 LYNYEGKEPGDLSFKKGDIILLRKRIDENWYHGECNGKQGFFPASYVQ 52

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 58.86 E-value: 7.40e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQD-MWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11877    1 LVRAKFNFEGTNEDELSFDKGDIITVTQVVEgGWWEGTLNGKTGWFPSNYVKE 53

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 58.94 E-value: 7.58e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11806    2 YVAIADFVATDDSQLSFESGDKLLVLRKPSVDWWWAEHNGCCGYIPASHL 51

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 58.66 E-value: 7.71e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILV-TKKDGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd12046    3 VALFSYEASQPEDLEFQKGDVILVlSKVNEDWLEGQCKGKIGIFPSAFVE 52

Fourth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212751 [Multi-domain] Cd Length: 50 Bit Score: 58.64 E-value: 8.12e-11

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNY 1208
Cdd:cd11817    2 AVALYDFTGETEEDLSFQRGDRILVTEHLDAEWSRGRLNGREGIFPRAF 50

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 58.90 E-value: 8.21e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKgewvdESQTGEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11875    1 KARVLFDYEAENEDELTLREGDIVTIL-----SKDCEDKGWWKGELNGKRGVFPDNFVE 54

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 67.30 E-value: 8.29e-11

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    327 QRLPEEPVLEDEQQQLEKKLPVTFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKErERQEQERKRQ 406
Cdd:pfam02463  183 ENLAELIIDLEELKLQELKLKEQAKKALEYYQLKEKLELEEEYLLYLDYLKLNEERIDLLQELLRDEQE-EIESSKQEIE 261

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    407 LELEKQLEKQRELERQREEERRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKEQEDIVvlKAKKKTLEFELEALN 486
Cdd:pfam02463  262 KEEEKLAQVLKENKEEEKEKKLQEEELKLLAKEEEELKSELLKLERRKVDDEEKLKESEKEKK--KAEKELKKEKEEIEE 339

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    487 DKKHQLEGKLQDIRCRLTTQRQEiESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRDSLV 566
Cdd:pfam02463  340 LEKELKELEIKREAEEEEEEELE-KLQEKLEQLEEELLAKKKLESERLSSAAKLKEEELELKSEEEKEAQLLLELARQLE 418

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    567 TLKRALEAKELArqhlrdQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQ-KQKSMEAERLKQKEQERKIIELEKQ 645
Cdd:pfam02463  419 DLLKEEKKEELE------ILEEEEESIELKQGKLTEEKEELEKQELKLLKDELElKKSEDLLKETQLVKLQEQLELLLSR 492

                          330
                   ....*....|....
gi 47717123    646 KEEAQRRAQERDKQ 659
Cdd:pfam02463  493 QKLEERSQKESKAR 506

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 58.83 E-value: 9.39e-11

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1164 YDYTAQNDD-ELAFNKGQIINVLNKEDP-----DWWKGEV-NGQVGLFPSNYV 1209
Cdd:cd11771    6 YDFTPENPEmELSLKKGDIVAVLSKTDPlgrdsEWWKGRTrDGRIGWFPSNYV 58

Src Homology 3 domain of Tec-like Protein Tyrosine Kinases; The Tec (Tyrosine kinase expressed in hepatocellular carcinoma) subfamily is composed of Tec, Btk, Bmx (Etk), Itk (Tsk, Emt), Rlk (Txk), and similar proteins. They are cytoplasmic (or nonreceptor) tyr kinases containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. Most Tec subfamily members (except Rlk) also contain an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation. In addition, some members contain the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. Tec kinases are expressed mainly by haematopoietic cells, although Tec and Bmx are also found in endothelial cells. B-cells express Btk and Tec, while T-cells express Itk, Txk, and Tec. Collectively, Tec kinases are expressed in a variety of myeloid cells such as mast cells, platelets, macrophages, and dendritic cells. Each Tec kinase shows a distinct cell-type pattern of expression. The function of Tec kinases in lymphoid cells have been studied extensively. They play important roles in the development, differentiation, maturation, regulation, survival, and function of B-cells and T-cells. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212702 [Multi-domain] Cd Length: 54 Bit Score: 58.44 E-value: 1.03e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKG-EVNGQVGLFPSNYVK 1210
Cdd:cd11768    1 IVVALYDFQPIEPGDLPLEKGEEYVVLDDSNEHWWRArDKNGNEGYIPSNYVT 53

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 58.55 E-value: 1.03e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11828    2 AEALWDHVTMDPEELGFKAGDVIEVLDMSDKDWWWGSIRDEEGWFPASFVRL 53

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 58.58 E-value: 1.06e-10

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKD-GDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11827    4 ALYAYDAQDTDELSFNEGDIIEILKEDpSGWWTGRLRGKEGLFPGNYV 51

N-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212881 [Multi-domain] Cd Length: 54 Bit Score: 58.29 E-value: 1.14e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKE-DPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11948    1 EAVALYSFQATESDELPFQKGDILKILNMEdDQNWYKAELQGREGYIPKNYIKV 54

Src Homology 3 domain of Bbc1 and similar domains; This subfamily is composed of Saccharomyces cerevisiae Bbc1p, also called Mti1p (Myosin tail region-interacting protein), and similar proteins. Bbc1p interacts with and regulates type I myosins in yeast, Myo3p and Myo5p, which are involved in actin cytoskeletal reorganization. It also binds and inhibits Las17, a WASp family protein that functions as an activator of the Arp2/3 complex. Bbc1p contains an N-terminal SH3 domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212820 [Multi-domain] Cd Length: 60 Bit Score: 58.51 E-value: 1.15e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEV-----NGQVGLFPSNYV 1209
Cdd:cd11887    4 VKALYPYESDHEDDLNFDVGQLITVTEEEDADWYFGEYvdsngNTKEGIFPKNFV 58

C2 domain second repeat present in Rabphilin and Double C2 domain; Rabphilin is found neurons and in neuroendrocrine cells, while Doc2 is found not only in the brain but in tissues, including mast cells, chromaffin cells, and osteoblasts. Rabphilin and Doc2s share highly homologous tandem C2 domains, although their N-terminal structures are completely different: rabphilin contains an N-terminal Rab-binding domain (RBD),7 whereas Doc2 contains an N-terminal Munc13-1-interacting domain (MID). C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 176030 [Multi-domain] Cd Length: 133 Bit Score: 60.82 E-value: 1.17e-10

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTM-----GSQCHITKTIQDTLNPKWNSNCQFFIR--DLEQEVLCITVFERDQ 1668
Cdd:cd08384   13 RGLIVGIIRCVNLAAMDANGYSDPFVKLYLkpdagKKSKHKTQVKKKTLNPEFNEEFFYDIKhsDLAKKTLEITVWDKDI 92


                 ....*...
gi 47717123 1669 FSPDDFLG 1676
Cdd:cd08384   93 GKSNDYIG 100

Fifth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212752 [Multi-domain] Cd Length: 50 Bit Score: 58.26 E-value: 1.20e-10

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNY 1208
Cdd:cd11818    5 LYDFTGENEDELSFKAGDIITELESIDEEWMSGELRGKSGIFPKNF 50

Second Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212708 [Multi-domain] Cd Length: 52 Bit Score: 58.25 E-value: 1.31e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDW-WKGEVNGQVGLFPSNYV 1209
Cdd:cd11774    1 QAKALYDYDKQTEEELSFNEGDTLDVYDDSDSDWiLVGFNGTQFGFVPANYI 52

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 58.16 E-value: 1.41e-10

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTK-KDGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd12061    4 AKFNFQQTNEDELSFSKGDVIHVTRvEEGGWWEGTHNGRTGWFPSNYVR 52

First Src homology 3 domain (or SH3A) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212770 [Multi-domain] Cd Length: 55 Bit Score: 58.14 E-value: 1.53e-10

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVL--NKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11836    5 LYAFEARNPDEISFQPGDIIQVDesQVAEPGWLAGELKGKTGWFPANYV 53

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 58.09 E-value: 1.59e-10

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11902    7 FAYVAEREDELSLVKGSRVTVMEKCSDGWWRGSYNGQIGWFPSNYV 52

Src homology 3 domain of Alpha Spectrin; Spectrin is a major structural component of the red blood cell membrane skeleton and is important in erythropoiesis and membrane biogenesis. It is a flexible, rope-like molecule composed of two subunits, alpha and beta, which consist of many spectrin-type repeats. Alpha and beta spectrin associate to form heterodimers and tetramers; spectrin tetramer formation is critical for red cell shape and deformability. Defects in alpha spectrin have been associated with inherited hemolytic anemias including hereditary spherocytosis (HSp), hereditary elliptocytosis (HE), and hereditary pyropoikilocytosis (HPP). Alpha spectrin contains a middle SH3 domain and a C-terminal EF-hand binding motif in addition to multiple spectrin repeats. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212742 [Multi-domain] Cd Length: 53 Bit Score: 57.49 E-value: 2.30e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11808    2 VVALYDYQEKSPREVSMKKGDILTLLNSSNKDWWKVEVNDRQGFVPAAYVK 52

N-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also have roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212880 [Multi-domain] Cd Length: 52 Bit Score: 57.50 E-value: 2.37e-10

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1162 GMYDYTAQNDDELAFNKGQIINVLNKEDpDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11947    4 GKFDFTASGEDELSFKKGDVLKILSSDD-IWFKAELNGEEGYVPKNFV 50

Third Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212750 [Multi-domain] Cd Length: 51 Bit Score: 57.42 E-value: 2.40e-10

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11816    6 FDFEGEQEDELSFSEGDVITLKEYVGEEWAKGELNGKIGIFPLNFV 51

C-terminal Src Homology 3 domain of the Nebulin family of proteins; Nebulin family proteins contain multiple nebulin repeats, and may contain an N-terminal LIM domain and/or a C-terminal SH3 domain. They have molecular weights ranging from 34 to 900 kD, depending on the number of nebulin repeats, and they all bind actin. They are involved in the regulation of actin filament architecture and function as stabilizers and scaffolds for cytoskeletal structures with which they associate, such as long actin filaments or focal adhesions. Nebulin family proteins that contain a C-terminal SH3 domain include the giant filamentous protein nebulin, nebulette, Lasp1, and Lasp2. Lasp2, also called LIM-nebulette, is an alternatively spliced variant of nebulette. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212723 [Multi-domain] Cd Length: 55 Bit Score: 57.33 E-value: 2.42e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEV--NGQVGLFPSNYVKL 1211
Cdd:cd11789    1 RYRAMYDYAAADDDEVSFQEGDVIINVEIIDDGWMEGTVqrTGQSGMLPANYVEL 55

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 57.28 E-value: 2.86e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQ-DMWWFGEVQGQKGWFPKSYV 966
Cdd:cd11766    1 PAVVKFNYEAQREDELSLRKGDRVLVLEKSsDGWWRGECNGQVGWFPSNYV 51

Uncharacterized N-terminal coiled-coil domain of peptidoglycan hydrolase CwlO [Function unknown];

Pssm-ID: 443091 [Multi-domain] Cd Length: 379 Bit Score: 64.08 E-value: 3.22e-10

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  460 QRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEITHLqqqlqesqqmlg 539
Cdd:COG3883   17 QIQAKQKELSELQAELEAAQAELDALQAELEELNEEYNELQAELEALQAEIDKLQAEIAEAEAEIEER------------ 84

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  540 rlipeKQILNDQLKQVQQNSLHRDSLVTLkraLEAKELARqhLRDQLDEVEKETRSKLQEIDifnnQLKELREIHNKQQL 619
Cdd:COG3883   85 -----REELGERARALYRSGGSVSYLDVL---LGSESFSD--FLDRLSALSKIADADADLLE----ELKADKAELEAKKA 150

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  620 QKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKREESVKKKDGEEKGKQ 699
Cdd:COG3883  151 ELEAKLAELEALKAELEAAKAELEAQQAEQEALLAQLSAEEAAAEAQLAELEAELAAAEAAAAAAAAAAAAAAAAAAAAA 230

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  700 EAQDKLGRLFHQHQEPAKPAVQAPWSTAEKGPLTISAQENVKVVYYRALYPFESRSHDEITIQPGDIVMVKGEWVDESQT 779
Cdd:COG3883  231 AAAAAAAAAAAAAASAAGAGAAGAAGAAAGSAGAAGAAAGAAGAGAAAASAAGGGAGGAGGGGGGGGAASGGSGGGSGGA 310


                 .
gi 47717123  780 G 780
Cdd:COG3883  311 G 311

helix-rich Mycoplasma protein; Members of this family occur strictly within a subset of Mycoplasma species. Members average 750 amino acids in length, including signal peptide. Sequences are predicted (Jpred 3) to be almost entirely alpha-helical. These sequences show strong periodicity (consistent with long alpha helical structures) and low complexity rich in D,E,N,Q, and K. Genes encoding these proteins are often found in tandem. The function is unknown.

Pssm-ID: 275316 [Multi-domain] Cd Length: 745 Bit Score: 64.66 E-value: 4.48e-10

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEKKLpvtfEDKKRENFERGNlELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKrqlELEKQLE 414
Cdd:TIGR04523  340 LNEQISQLKKEL----TNSESENSEKQR-ELEEKQNEIEKLKKENQSYKQEIKNLESQINDLESKIQNQE---KLNQQKD 411

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    415 KQRELERQReeerrkeierreaaKRELERQRQlewernrrqELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEG 494
Cdd:TIGR04523  412 EQIKKLQQE--------------KELLEKEIE---------RLKETIIKNNSEIKDLTNQDSVKELIIKNLDNTRESLET 468

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    495 KLQDIRCRLTTQRQEIESTNKSRELRIAEIThlqqqlqesqqmlgRLIPEKQILNDQLKQVQQNSlhrDSLVTLKRALEA 574
Cdd:TIGR04523  469 QLKVLSRSINKIKQNLEQKQKELKSKEKELK--------------KLNEEKKELEEKVKDLTKKI---SSLKEKIEKLES 531

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    575 ----KELARQHLRDQLDEVEKE-TRSKLQ-EIDIFNNQLKELReiHNKQQLQKQKSMEAERLKQKEQERKiiELEKQKEE 648
Cdd:TIGR04523  532 ekkeKESKISDLEDELNKDDFElKKENLEkEIDEKNKEIEELK--QTQKSLKKKQEEKQELIDQKEKEKK--DLIKEIEE 607

                          330       340       350       360       370       380       390
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|..
gi 47717123    649 AQRRAQERDKQwLEHVQQEDEhqrprKLHEEEKlkreesvkkkdgeekGKQEAQDKLGRLFHQHQEPAKPAV 720
Cdd:TIGR04523  608 KEKKISSLEKE-LEKAKKENE-----KLSSIIK---------------NIKSKKNKLKQEVKQIKETIKEIR 658

Caldesmon;

Pssm-ID: 460421 [Multi-domain] Cd Length: 495 Bit Score: 64.12 E-value: 4.49e-10

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    387 ERAEQERKERERQEQERKRQLE--------LEKQLEKQRELERQREEERRKEIERREAA------KRELERQRQLEWERN 452
Cdd:pfam02029    5 EEAARERRRRAREERRRQKEEEepsgqvteSVEPNEHNSYEEDSELKPSGQGGLDEEEAfldrtaKREERRQKRLQEALE 84

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    453 RRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKL----------QDIRCRLTTQRQEIESTNKSRELRIA 522
Cdd:pfam02029   85 RQKEFDPTIADEKESVAERKENNEEEENSSWEKEEKRDSRLGRYkeeeteirekEYQENKWSTEVRQAEEEGEEEEDKSE 164

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    523 EITHLQQQLQESQQMLGRLIPE--------KQILNDQLKQVQQNSLHRDSLVTlkrALEAKELARQHLRDQLDEVEKETR 594
Cdd:pfam02029  165 EAEEVPTENFAKEEVKDEKIKKekkvkyesKVFLDQKRGHPEVKSQNGEEEVT---KLKVTTKRRQGGLSQSQEREEEAE 241

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    595 SKLQEidifNNQLKELReihnkQQLQKQKSMEAERLKQKEQERkIIELE--KQKEEAQRRAQErdkqwlehvqqedEHQR 672
Cdd:pfam02029  242 VFLEA----EQKLEELR-----RRRQEKESEEFEKLRQKQQEA-ELELEelKKKREERRKLLE-------------EEEQ 298

                          330
                   ....*....|....
gi 47717123    673 PRKLHEEEKLKREE 686
Cdd:pfam02029  299 RRKQEEAERKLREE 312

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 56.56 E-value: 4.92e-10

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11920    6 VYDFKAQTSKELSFKKGDTVYILRKIDQNWYEGEHHGRVGIFPISYVE 53

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 56.70 E-value: 5.01e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKGEwvdesQTGEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd12142    1 YCRVLFDYNPVAPDELALKKGDVIEVISK-----ETEDEGWWEGELNGRRGFFPDNFVM 54

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 56.54 E-value: 5.03e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11772    2 FRALYDYEAQHPDELSFEEGDLLYI-------SDKSDPNWWKATCGGKTGLIPSNYVE 52

Domain of unknown function (DUF4670); This family of proteins is found in eukaryotes. Proteins in this family are typically between 373 and 763 amino acids in length.

Pssm-ID: 464815 [Multi-domain] Cd Length: 522 Bit Score: 64.20 E-value: 5.07e-10

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    330 PEEPV-LEDEQQQLEKKLPVTFEDKKRENFERGN---LELEKRRQALLEQQRKEQErlaQLERAEQERKERERQEQERKR 405
Cdd:pfam15709  311 SEEERsEEDPSKALLEKREQEKASRDRLRAERAEmrrLEVERKRREQEEQRRLQQE---QLERAEKMREELELEQQRRFE 387

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    406 QLELEKQlekQRELERQREEERRKEIERREAAKRELERQRQLEWERnRRQELlnQRNKEQEDIVVLKAKKKTL-EFELEA 484
Cdd:pfam15709  388 EIRLRKQ---RLEEERQRQEEEERKQRLQLQAAQERARQQQEEFRR-KLQEL--QRKKQQEEAERAEAEKQRQkELEMQL 461

                          170       180       190
                   ....*....|....*....|....*....|...
gi 47717123    485 LNDKKHQLEGKLQDircRLTTQRQEIESTNKSR 517
Cdd:pfam15709  462 AEEQKRLMEMAEEE---RLEYQRQKQEAEEKAR 491

Src homology 3 domain of Apoptosis Stimulating of p53 proteins (ASPP); The ASPP family of proteins bind to important regulators of apoptosis (p53, Bcl-2, and RelA) and cell growth (APCL, PP1). They share similarity at their C-termini, where they harbor a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain. Vertebrates contain three members of the family: ASPP1, ASPP2, and iASPP. ASPP1 and ASPP2 activate the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73), while iASPP is an oncoprotein that specifically inhibits p53-induced apoptosis. The expression of ASPP proteins is altered in tumors; ASPP1 and ASPP2 are downregulated whereas iASPP is upregulated is some cancer types. ASPP proteins also bind and regulate protein phosphatase 1 (PP1), and this binding is competitive with p53 binding. The SH3 domain and the ANK repeats of ASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212741 [Multi-domain] Cd Length: 57 Bit Score: 56.62 E-value: 5.33e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPD---WWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11807    2 VVYALFDYEAENGDELSFREGDELTVLRKGDDDeteWWWARLNDKEGYVPRNLLGL 57

Src Homology 3 domain of Small G protein Signaling Modulator 3; SGSM3 is also called Merlin-associated protein (MAP), RUN and SH3 domain-containing protein (RUSC3), RUN and TBC1 domain-containing protein 3 (RUTBC3), Rab GTPase-activating protein 5 (RabGAP5), or Rab GAP-like protein (RabGAPLP). It is expressed ubiquitously and functions as a regulator of small G protein RAP- and RAB-mediated neuronal signaling. It is involved in modulating NGF-mediated neurite outgrowth and differentiation. It also interacts with the tumor suppressor merlin and may play a role in the merlin-associated suppression of cell growth. SGSM3 contains TBC, SH3, and RUN domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212747 Cd Length: 53 Bit Score: 56.35 E-value: 5.49e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQD-MWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11813    1 RAKALLDFERHDDDELGFRKNDIITIISQKDeHCWVGELNGLRGWFPAKFVEL 53

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 56.57 E-value: 5.62e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPD-WWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11978    4 IARYDFCARDMRELSLLKGDVVKIYTKMSTNgWWRGEVNGRVGWFPSTYVE 54

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 56.25 E-value: 5.66e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVL---EQQDMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd11841    1 EVTALYSFEGQQPCDLSFQAGDRITVLtrtDSQFDWWEGRLRGRVGIFPANYVS 54

C2 domain first repeat found in Multiple C2 domain and Transmembrane region Proteins (MCTP); plant subset; MCTPs are involved in Ca2+ signaling at the membrane. Plant-MCTPs are composed of a variable N-terminal sequence, four C2 domains, two transmembrane regions (TMRs), and a short C-terminal sequence. It is one of four protein classes that are anchored to membranes via a transmembrane region; the others being synaptotagmins, extended synaptotagmins, and ferlins. MCTPs are the only membrane-bound C2 domain proteins that contain two functional TMRs. MCTPs are unique in that they bind Ca2+ but not phospholipids. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-II topology.

Pssm-ID: 175989 [Multi-domain] Cd Length: 127 Bit Score: 58.89 E-value: 5.83e-10

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1597 RLMVNVVEGIELKPCRSHGKSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRD---LEQEVLCITVF-ERDQFSPD 1672
Cdd:cd04022    1 KLVVEVVDAQDLMPKDGQGSSSAYVELDFDGQKKRTRTKPKDLNPVWNEKLVFNVSDpsrLSNLVLEVYVYnDRRSGRRR 80


                 ....*...
gi 47717123 1673 DFLGRTEI 1680
Cdd:cd04022   81 SFLGRVRI 88

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase and similar proteins; This subfamily is composed of Rho GTPase activating proteins (GAPs) with similarity to GRAF. Members contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. Although vertebrates harbor four Rho GAPs in the GRAF subfamily including GRAF, GRAF2, GRAF3, and Oligophrenin-1 (OPHN1), only three are included in this model. OPHN1 contains the BAR, PH and GAP domains, but not the C-terminal SH3 domain. GRAF and GRAF2 show GAP activity towards RhoA and Cdc42. GRAF influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase. GRAF2 regulates caspase-activated p21-activated protein kinase-2. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212815 [Multi-domain] Cd Length: 54 Bit Score: 56.15 E-value: 5.94e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVmvkgewVDESQTGEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11882    3 RALYACKAEDESELSFEPGQII------TNVQPSDEPGWLEGTLNGRTGLIPENYVE 53

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 64.32 E-value: 6.18e-10

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    376 QRKEQERLAQL-ERAEQERKERERQEQERKRQLELEKQLEKQRELERQREEERrkeierreaaKRELER-QRQLEWERNR 453
Cdd:TIGR02169  669 SRSEPAELQRLrERLEGLKRELSSLQSELRRIENRLDELSQELSDASRKIGEI----------EKEIEQlEQEEEKLKER 738

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    454 RQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQR--------QEIESTNKSRELRIAEIT 525
Cdd:TIGR02169  739 LEELEEDLSSLEQEIENVKSELKELEARIEELEEDLHKLEEALNDLEARLSHSRipeiqaelSKLEEEVSRIEARLREIE 818

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    526 HLQQQLQESQQMLGRLIPEKQILNDQLKQvQQNSLHR--DSLVTLKRALEA----KELARQHLRDQLDEVEKET---RSK 596
Cdd:TIGR02169  819 QKLNRLTLEKEYLEKEIQELQEQRIDLKE-QIKSIEKeiENLNGKKEELEEeleeLEAALRDLESRLGDLKKERdelEAQ 897

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    597 LQEIDIFNNQLKELREIHNKQ--QLQKQKSMEAERLKQKEQERKIIELEKQKE------EAQRRAQERDKQWLEHV---- 664
Cdd:TIGR02169  898 LRELERKIEELEAQIEKKRKRlsELKAKLEALEEELSEIEDPKGEDEEIPEEElsledvQAELQRVEEEIRALEPVnmla 977

                          330       340
                   ....*....|....*....|....
gi 47717123    665 -QQEDEHQRPRKLHEE--EKLKRE 685
Cdd:TIGR02169  978 iQEYEEVLKRLDELKEkrAKLEEE 1001

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 56.14 E-value: 6.37e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVTKKDG-DWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11996    2 QVIAMYDYTANNEDELSFSKGQLINVLNKDDpDWWQGEINGVTGLFPSNYVKM 54

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 56.11 E-value: 6.67e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKgewvdeSQTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11976    3 KARYDFCARDRSELSLKEGDIIKIL------NKKGQQGWWRGEIYGRVGWFPANYVEE 54

C2 domain first repeat contained in Rab3-interacting molecule (RIM) proteins; RIMs are believed to organize specialized sites of the plasma membrane called active zones. They also play a role in controlling neurotransmitter release, plasticity processes, as well as memory and learning. RIM contains an N-terminal zinc finger domain, a PDZ domain, and two C-terminal C2 domains (C2A, C2B). C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members here have a type-I topology and do not bind Ca2+.

Pssm-ID: 175997 [Multi-domain] Cd Length: 125 Bit Score: 58.41 E-value: 6.89e-10

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTM---GSQCHI--TKTIQDTLNPKWNsncQFFI------RDLEQEVLCITVF 1664
Cdd:cd04031   16 SQLIVTVLQARDLPPRDDGSLRNPYVKVYLlpdRSEKSKrrTKTVKKTLNPEWN---QTFEysnvrrETLKERTLEVTVW 92

                         90       100
                 ....*....|....*....|
gi 47717123 1665 ERDQFSPDDFLGRTEIRVAD 1684
Cdd:cd04031   93 DYDRDGENDFLGEVVIDLAD 112

C2 domain present in the Human neural precursor cell-expressed, developmentally down-regulated 4 (NEDD4) and NEDD4-like (NEDD4L/NEDD42); Nedd4 and Nedd4-2 are two of the nine members of the Human Nedd4 family. All vertebrates appear to have both Nedd4 and Nedd4-2 genes. They are thought to participate in the regulation of epithelial Na+ channel (ENaC) activity. They also have identical specificity for ubiquitin conjugating enzymes (E2). Nedd4 and Nedd4-2 are composed of a C2 domain, 2-4 WW domains, and a ubiquitin ligase Hect domain. Their WW domains can bind PPxY (PY) or LPSY motifs, and in vitro studies suggest that WW3 and WW4 of both proteins bind PY motifs in the key substrates, with WW3 generally exhibiting higher affinity. Most Nedd4 family members, especially Nedd4-2, also have multiple splice variants, which might play different roles in regulating their substrates. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 175999 [Multi-domain] Cd Length: 133 Bit Score: 58.52 E-value: 7.15e-10

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1598 LMVNVVEGIELKPCRSHGKSNPYCEVTM-------GSQCHITKTIQDTLNPKWnsNCQFFIR-DLEQEVLCITVFERDQF 1669
Cdd:cd04033    2 LRVKVLAGIDLAKKDIFGASDPYVKISLydpdgngEIDSVQTKTIKKTLNPKW--NEEFFFRvNPREHRLLFEVFDENRL 79

                         90       100
                 ....*....|....*....|....*....
gi 47717123 1670 SPDDFLGRTEIRVADIK-KDQGSKGPVTK 1697
Cdd:cd04033   80 TRDDFLGQVEVPLNNLPtETPGNERRYTF 108

Caldesmon;

Pssm-ID: 460421 [Multi-domain] Cd Length: 495 Bit Score: 63.35 E-value: 7.29e-10

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    379 EQERLAQLERAEQERKERERQEQERKRQLELEKQLEKQRELERQREEERRKEIERRE---------AAKRELERQRQLEW 449
Cdd:pfam02029    2 EDEEEAARERRRRAREERRRQKEEEEPSGQVTESVEPNEHNSYEEDSELKPSGQGGLdeeeafldrTAKREERRQKRLQE 81

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    450 ERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKL----------QDIRCRLTTQRQEIESTNKSREL 519
Cdd:pfam02029   82 ALERQKEFDPTIADEKESVAERKENNEEEENSSWEKEEKRDSRLGRYkeeeteirekEYQENKWSTEVRQAEEEGEEEED 161

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    520 RIAEITHLQQQLQESQQMLGRLIPE--------KQILNDQLKQVQQNSLHRDSLVTlkrALEAKELARQHLRDQLDEVEK 591
Cdd:pfam02029  162 KSEEAEEVPTENFAKEEVKDEKIKKekkvkyesKVFLDQKRGHPEVKSQNGEEEVT---KLKVTTKRRQGGLSQSQEREE 238

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    592 ETRSKLQEidifNNQLKELReihnkQQLQKQKSMEAERLKQKEQERkIIELE--KQKEEAQRRAQERDKQwlehvQQEDE 669
Cdd:pfam02029  239 EAEVFLEA----EQKLEELR-----RRRQEKESEEFEKLRQKQQEA-ELELEelKKKREERRKLLEEEEQ-----RRKQE 303

                          330
                   ....*....|....*..
gi 47717123    670 HQRPRKLHEEEKLKREE 686
Cdd:pfam02029  304 EAERKLREEEEKRRMKE 320

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 56.12 E-value: 7.54e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd11873    1 EVIVEFDYDAEEPDELTLKVGDIITnVKKMEEGWWEGTLNGKRGMFPDNFVK 52

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 55.98 E-value: 7.62e-10

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGE-VQGQKGWFPKSYV 966
Cdd:cd11812    4 ALYDYTANRSDELTIHRGDIIRVLYKdNDNWWFGSlVNGQQGYFPANYV 52

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 55.67 E-value: 7.70e-10

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*.
gi 47717123    919 QALYPWRAKKDNHLNFNKNDVITVLEQQ-DMWWFGEVQ-GQKGWFP 962
Cdd:pfam00018    1 VALYDYTAQEPDELSFKKGDIIIVLEKSeDGWWKGRNKgGKEGLIP 46

FYVE, RhoGEF and PH domain containing/faciogenital dysplasia proteins 5 and 6, N-terminal Pleckstrin Homology (PH) domain; FGD5 regulates promotes angiogenesis of vascular endothelial growth factor (VEGF) in vascular endothelial cells, including network formation, permeability, directional movement, and proliferation. The specific function of FGD6 is unknown. In general, FGDs have a RhoGEF (DH) domain, followed by a PH domain, a FYVE domain and a C-terminal PH domain. All FGDs are guanine nucleotide exchange factors that activate the Rho GTPase Cdc42, an important regulator of membrane trafficking. The RhoGEF domain is responsible for GEF catalytic activity, while the PH domain is involved in intracellular targeting of the DH domain. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 275424 Cd Length: 124 Bit Score: 58.44 E-value: 7.96e-10

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1461 RKFLHSGKLYKAkSNKEL---YGFLFNDFLLltqITKPLGSSGTDKVFS--PKSNLQYKMYKTPIFLNEvlvklptdpsg 1535
Cdd:cd13389   12 RKLIKEGELMKV-SRKEMqprYFFLFNDCLL---YTTPVQSSGMLKLNNelPLSGMKVKLPEDEEYSNE----------- 76

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1536 depiFHISHIDRVYTLRAESINERTAWVQKIKAAselyIETEKKKR 1581
Cdd:cd13389   77 ----FQIISTKRSFTLIASSEEERDEWVKALSRA----IEEHTKKQ 114

Second Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212749 [Multi-domain] Cd Length: 52 Bit Score: 56.04 E-value: 8.66e-10

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11815    5 LHDFPAEHSDDLSLNSGEIVYLLEKIDTEWYRGKCKNTTGIFPANHVK 52

Src homology 3 domain of Fyn and Yrk Protein Tyrosine Kinases; Fyn and Yrk (Yes-related kinase) are members of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Fyn, together with Lck, plays a critical role in T-cell signal transduction by phosphorylating ITAM (immunoreceptor tyr activation motif) sequences on T-cell receptors, ultimately leading to the proliferation and differentiation of T-cells. In addition, Fyn is involved in the myelination of neurons, and is implicated in Alzheimer's and Parkinson's diseases. Yrk has been detected only in chickens. It is primarily found in neuronal and epithelial cells and in macrophages. It may play a role in inflammation and in response to injury. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212939 [Multi-domain] Cd Length: 56 Bit Score: 55.83 E-value: 9.37e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGE--VNGQVGLFPSNYV 1209
Cdd:cd12006    4 VALYDYEARTEDDLSFHKGEKFQILNSSEGDWWEARslTTGETGYIPSNYV 54

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 55.78 E-value: 9.56e-10

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEV-QGQKGWFPKSYVKL 968
Cdd:cd11819    1 RAKALYDYQAAEDNEISFVEGDIITQIEQIDEgWWLGVNaKGQKGLFPANYVEL 54

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 55.81 E-value: 9.68e-10

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11823    4 ALYSYTANREDELSLQPGDIIEVHEKQDDgWWLGELNGKKGIFPATYV 51

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 64.01 E-value: 9.74e-10

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   331 EEPVLEDEQQQLEKKLPVTFEDKKRENFERGnlelEKRRQALLEQQRKEQERLAQLERAEQERK-------ERERQEQER 403
Cdd:PTZ00121 1500 DEAKKAAEAKKKADEAKKAEEAKKADEAKKA----EEAKKADEAKKAEEKKKADELKKAEELKKaeekkkaEEAKKAEED 1575

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   404 K----RQLELEKQLEKQRELERQREEERRKEIERREAAKRELERQR--QLEWERNRRQELLNQRNKEQEDivvlKAKKKT 477
Cdd:PTZ00121 1576 KnmalRKAEEAKKAEEARIEEVMKLYEEEKKMKAEEAKKAEEAKIKaeELKKAEEEKKKVEQLKKKEAEE----KKKAEE 1651

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   478 LEFELEALNDKKHQLegklqdircrlttQRQEIESTNKSRELRIAEithlqqqlqesqqmlgrlipekqilNDQLKQVQQ 557
Cdd:PTZ00121 1652 LKKAEEENKIKAAEE-------------AKKAEEDKKKAEEAKKAE-------------------------EDEKKAAEA 1693

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   558 nslhrdslvtLKRALEAKELARQHLRDQLDEVEK-ETRSKLQEIdifnNQLKeLREIHNKQQLQKQKsmeAERLKQKEQE 636
Cdd:PTZ00121 1694 ----------LKKEAEEAKKAEELKKKEAEEKKKaEELKKAEEE----NKIK-AEEAKKEAEEDKKK---AEEAKKDEEE 1755

                         330       340       350       360
                  ....*....|....*....|....*....|....*....|....*....
gi 47717123   637 RKIIELEKQKEEAQRRAQERDKQWL--EHVQQEDEhqrPRKLHEEEKLK 683
Cdd:PTZ00121 1756 KKKIAHLKKEEEKKAEEIRKEKEAVieEELDEEDE---KRRMEVDKKIK 1801

C2 domain second repeat present in RasA1 and RasA4; RasA1 and RasA4 are GAP1s (GTPase activating protein 1s ), Ras-specific GAP members, which suppresses Ras function by enhancing the GTPase activity of Ras proteins resulting in the inactive GDP-bound form of Ras. In this way it can control cellular proliferation and differentiation. Both proteins contain two C2 domains, a Ras-GAP domain, a plextrin homology (PH)-like domain, and a Bruton's Tyrosine Kinase (BTK) zinc binding domain. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 175991 [Multi-domain] Cd Length: 123 Bit Score: 57.88 E-value: 1.01e-09

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1597 RLMVNVVEGIELKPCRSHGKSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQFSPDDFLG 1676
Cdd:cd04025    1 RLRCHVLEARDLAPKDRNGTSDPFVRVFYNGQTLETSVVKKSCYPRWNEVFEFELMEGADSPLSVEVWDWDLVSKNDFLG 80

                         90
                 ....*....|....*..
gi 47717123 1677 RTEIRVADIKKDQGSKG 1693
Cdd:cd04025   81 KVVFSIQTLQQAKQEEG 97

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 55.73 E-value: 1.07e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11995    2 QVIGMYDYTAQNDDELAFSKGQIInVLNKEDPDWWKGELNGQVGLFPSNYVKL 54

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 55.60 E-value: 1.15e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKGEwvdesQTGEPGWLGGELKGKTGWFPANYA 801
Cdd:cd12056    3 YCKALFHYEGTNEDELDFKEGEIILIISK-----DTGEPGWWKGELNGKEGVFPDNFV 55

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 3 (PACSIN3); PACSIN 3 or Syndapin III (Synaptic dynamin-associated protein III) is expressed ubiquitously and regulates glucose uptake in adipocytes through its role in GLUT1 trafficking. It also modulates the subcellular localization and stimulus-specific function of the cation channel TRPV4. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212930 [Multi-domain] Cd Length: 56 Bit Score: 55.74 E-value: 1.15e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPD-WWKGEV-NGQVGLFPSNYVK 1210
Cdd:cd11997    3 RVRALYDYTGQEADELSFKAGEELLKIGEEDEQgWCKGRLlSGRIGLYPANYVE 56

Third Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. The third SH3 domain of Sla1p can bind ubiquitin while retaining the ability to bind proline-rich ligands; monoubiquitination of target proteins signals internalization and sorting through the endocytic pathway. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212709 [Multi-domain] Cd Length: 57 Bit Score: 55.79 E-value: 1.16e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDP-DWWKGE--VNGQVGLFPSNYVKL 1211
Cdd:cd11775    6 LYDFDAQSDDELTVKEGDVVYILDDKKSkDWWMVEnvSTGKEGVVPASYIEI 57

Src homology 3 domain of Blk Protein Tyrosine Kinase; Blk is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. It is expressed specifically in B-cells and is involved in pre-BCR (B-cell receptor) signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212942 [Multi-domain] Cd Length: 54 Bit Score: 55.59 E-value: 1.19e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLnKEDPDWW--KGEVNGQVGLFPSNYV 1209
Cdd:cd12009    2 VIAQYDFVPSNERDLQLKKGEKLQVL-KSDGEWWlaKSLTTGKEGYIPSNYV 52

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing (Stac) proteins; Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. This model represents the first C-terminal SH3 domain of Stac1 and Stac3, and the single C-terminal SH3 domain of Stac2. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212767 [Multi-domain] Cd Length: 53 Bit Score: 55.59 E-value: 1.23e-09

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11833    3 VALYKFKPQENEDLEMRPGDKITLLDDSNEDWWKGKIEDRVGFFPANFV 51

Fourth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212751 [Multi-domain] Cd Length: 50 Bit Score: 55.18 E-value: 1.31e-09

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNY 1054
Cdd:cd11817    3 VALYDFTGETEEDLSFQRGDRILVTEHlDAEWSRGRLNGREGIFPRAF 50

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 55.33 E-value: 1.31e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVK 967
Cdd:cd11805    1 RVQALYDFNPQEPGELEFRRGDIITVLDSSDPdWWKGELRGRVGIFPANYVQ 52

exonuclease SbcC; All proteins in this family for which functions are known are part of an exonuclease complex with sbcD homologs. This complex is involved in the initiation of recombination to regulate the levels of palindromic sequences in DNA. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

Pssm-ID: 129705 [Multi-domain] Cd Length: 1042 Bit Score: 63.45 E-value: 1.33e-09

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    338 EQQQLEKKLPVTFEDKKRENFER--GNLELEKRRQALLEQQRKE-----QERLAQLERAEQERKERERQEQERKRQLELE 410
Cdd:TIGR00618  268 RIEELRAQEAVLEETQERINRARkaAPLAAHIKAVTQIEQQAQRihtelQSKMRSRAKLLMKRAAHVKQQSSIEEQRRLL 347

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    411 KQLEKQRELERQREEERRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKH 490
Cdd:TIGR00618  348 QTLHSQEIHIRDAHEVATSIREISCQQHTLTQHIHTLQQQKTTLTQKLQSLCKELDILQREQATIDTRTSAFRDLQGQLA 427

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    491 QLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGrlipEKQILNDQLKQVQQNSLHR-DSLVTLK 569
Cdd:TIGR00618  428 HAKKQQELQQRYAELCAAAITCTAQCEKLEKIHLQESAQSLKEREQQLQ----TKEQIHLQETRKKAVVLARlLELQEEP 503

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    570 RALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREI-HNKQQLQKQksmeAERLKQKEQErkiielEKQKEE 648
Cdd:TIGR00618  504 CPLCGSCIHPNPARQDIDNPGPLTRRMQRGEQTYAQLETSEEDVyHQLTSERKQ----RASLKEQMQE------IQQSFS 573

                          330       340       350       360       370       380
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123    649 AQRRAQERDKQWLEHVQQEDEHQRP--RKLHEEEKLKREESvkkkDGEEKGKQEAQDKLGRLFHQHQ 713
Cdd:TIGR00618  574 ILTQCDNRSKEDIPNLQNITVRLQDltEKLSEAEDMLACEQ----HALLRKLQPEQDLQDVRLHLQQ 636

Pleckstrin homology domain; Domain commonly found in eukaryotic signalling proteins. The domain family possesses multiple functions including the abilities to bind inositol phosphates, and various proteins. PH domains have been found to possess inserted domains (such as in PLC gamma, syntrophins) and to be inserted within other domains. Mutations in Brutons tyrosine kinase (Btk) within its PH domain cause X-linked agammaglobulinaemia (XLA) in patients. Point mutations cluster into the positively charged end of the molecule around the predicted binding site for phosphatidylinositol lipids.

Pssm-ID: 214574 [Multi-domain] Cd Length: 102 Bit Score: 56.79 E-value: 1.41e-09

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    1463 FLHSGKLYKAKSN-----KELYGFLFNDFLLLtqitkplgssgtdkvFSPKSNLQYKMYKTPIFLNEVLVKLPTDPSGDE 1537
Cdd:smart00233    1 VIKEGWLYKKSGGgkkswKKRYFVLFNSTLLY---------------YKSKKDKKSYKPKGSIDLSGCTVREAPDPDSSK 65

                            90       100       110
                    ....*....|....*....|....*....|....*.
gi 47717123    1538 P--IFHISHIDR-VYTLRAESINERTAWVQKIKAAS 1570
Cdd:smart00233   66 KphCFEIKTSDRkTLLLQAESEEEREKWVEALRKAI 101

Third Src homology 3 domain (or SH3C) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. The SH3C of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212772 [Multi-domain] Cd Length: 52 Bit Score: 55.11 E-value: 1.45e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11838    3 IALYPYESNEPGDLTFNAGDVILVTKKDGEWWTGTIGDRTGIFPSNYVRP 52

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing (Stac) proteins; Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. This model represents the first C-terminal SH3 domain of Stac1 and Stac3, and the single C-terminal SH3 domain of Stac2. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212767 [Multi-domain] Cd Length: 53 Bit Score: 55.20 E-value: 1.46e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTK-KDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11833    2 YVALYKFKPQENEDLEMRPGDKITLLDdSNEDWWKGKIEDRVGFFPANFV 51

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRB2 binds to Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, as well as to the proline-rich C-terminus of FGRF2. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212882 [Multi-domain] Cd Length: 53 Bit Score: 55.23 E-value: 1.48e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVK 967
Cdd:cd11949    2 VQALFDFDPQEDGELGFRRGDFIEVMDNSDPnWWKGACHGQTGMFPRNYVT 52

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 55.03 E-value: 1.53e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGE--VNGQVGLFPSNYV 1209
Cdd:cd11793    1 QVQCVHAYTAQQPDELTLEEGDVVNVLRKMPDGWYEGErlRDGERGWFPSSYT 53

C2 domain present in Smad ubiquitination-related factor (Smurf)-like proteins; A single C2 domain is found in Smurf proteins, C2-WW-HECT-domain E3s, which play an important role in the downregulation of the TGF-beta signaling pathway. Smurf proteins also regulate cell shape, motility, and polarity by degrading small guanosine triphosphatases (GTPases). C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members here have type-II topology.

Pssm-ID: 176028 [Multi-domain] Cd Length: 123 Bit Score: 57.32 E-value: 1.68e-09

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1619 PYCEVTM-GSQCHITKTIQDTLNPKWNSNCQFFIRDleQEVLCITVFERDQFSPDD--FLGRTEIRVADIkkdQGSKGPV 1695
Cdd:cd08382   23 PFAVITVdGGQTHSTDVAKKTLDPKWNEHFDLTVGP--SSIITIQVFDQKKFKKKDqgFLGCVRIRANAV---LPLKDTG 97

                         90       100
                 ....*....|....*....|....*
gi 47717123 1696 TKCLLLH-------EVPTGEIVVRL 1713
Cdd:cd08382   98 YQRLDLRklkksdnLSVRGKIVVSL 122

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 55.04 E-value: 1.79e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1084 SYTATGPEQLTLAPGQLILIRKKNPGGWWEGELqaRGKKrqiGWFPANYV 1133
Cdd:cd11823    7 SYTANREDELSLQPGDIIEVHEKQDDGWWLGEL--NGKK---GIFPATYV 51

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 54.73 E-value: 1.86e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwvDESqtgepGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11827    3 KALYAYDAQDTDELSFNEGDIIEILKE--DPS-----GWWTGRLRGKEGLFPGNYVEK 53

Second Src homology 3 domain (or SH3B) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212923 [Multi-domain] Cd Length: 52 Bit Score: 55.05 E-value: 1.90e-09

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1166 YTAQNDDELAFNKGQIINVLNKEDpDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11990    8 WTAKKDNHLNFSKNDIITVLEQQE-NWWFGEVHGGRGWFPKSYVKL 52

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 62.68 E-value: 1.90e-09

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    375 QQRKEQERL--------AQLERAEQERKERERQEQERKRQLELEKqlekqrelerqreeerrkeierreaakRELERQRQ 446
Cdd:pfam02463  148 AMMKPERRLeieeeaagSRLKRKKKEALKKLIEETENLAELIIDL---------------------------EELKLQEL 200

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    447 LEwERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLegklqdircrLTTQRQEIESTNKSRELRIAEITH 526
Cdd:pfam02463  201 KL-KEQAKKALEYYQLKEKLELEEEYLLYLDYLKLNEERIDLLQEL----------LRDEQEEIESSKQEIEKEEEKLAQ 269

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    527 LQQQLQESQQmlgrlipEKQILNDQLKQVQQNSLhrdslvTLKRALEAKELARQHLRDQLDEVEKETRSKLQEID---IF 603
Cdd:pfam02463  270 VLKENKEEEK-------EKKLQEEELKLLAKEEE------ELKSELLKLERRKVDDEEKLKESEKEKKKAEKELKkekEE 336

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    604 NNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQ-WLEHVQQEDEHQRPRKLHEEEKL 682
Cdd:pfam02463  337 IEELEKELKELEIKREAEEEEEEELEKLQEKLEQLEEELLAKKKLESERLSSAAKLkEEELELKSEEEKEAQLLLELARQ 416


                   ....
gi 47717123    683 KREE 686
Cdd:pfam02463  417 LEDL 420

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 54.54 E-value: 1.93e-09

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 47717123    920 ALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGEVQGQKGWFPKSYVK 967
Cdd:pfam14604    1 ALYPYEPKDDDELSLQRGDVITVIEEsEDGWWEGINTGRTGLVPANYVE 49

Trichohyalin-plectin-homology domain; This family is a mixtrue of two different families of eukaryotic proteins. Trichoplein or mitostatin, was first defined as a meiosis-specific nuclear structural protein. It has since been linked with mitochondrial movement. It is associated with the mitochondrial outer membrane, and over-expression leads to reduction in mitochondrial motility whereas lack of it enhances mitochondrial movement. The activity appears to be mediated through binding the mitochondria to the actin intermediate filaments (IFs). The family is in the trichohyalin-plectin-homology domain.

Pssm-ID: 464007 [Multi-domain] Cd Length: 341 Bit Score: 61.09 E-value: 2.05e-09

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    338 EQQQLEKKLpVTFEDKKREnfERGNLELEK-RRQALLEQQRKEQERL-----------AQLERAEQERKERERQEQERKR 405
Cdd:pfam13868   25 DAQIAEKKR-IKAEEKEEE--RRLDEMMEEeRERALEEEEEKEEERKeerkryrqeleEQIEEREQKRQEEYEEKLQERE 101

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    406 QL----------ELEKQLEKQrelerqreeerrkeiERREAAKRELERQRQlewERNRRQELLNQRNKEQEDIVVLKAKK 475
Cdd:pfam13868  102 QMdeiveriqeeDQAEAEEKL---------------EKQRQLREEIDEFNE---EQAEWKELEKEEEREEDERILEYLKE 163

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    476 KTLEFelEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEithlqqqlqesqqmlgRLIPEKQILNDQLKQV 555
Cdd:pfam13868  164 KAERE--EEREAEREEIEEEKEREIARLRAQQEKAQDEKAERDELRAK----------------LYQEEQERKERQKERE 225

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    556 QQnslhrdslvtLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKsmeaERLKQKEQ 635
Cdd:pfam13868  226 EA----------EKKARQRQELQQAREEQIELKERRLAEEAEREEEEFERMLRKQAEDEEIEQEEAEK----RRMKRLEH 291

                          330       340       350       360
                   ....*....|....*....|....*....|....*....|....*...
gi 47717123    636 ERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQrpRKLHEEEKLK 683
Cdd:pfam13868  292 RRELEKQIEEREEQRAAEREEELEEGERLREEEAER--RERIEEERQK 337

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 54.91 E-value: 2.12e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 47717123    918 AQALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGEVQGQKGWFPKSYVKLI 969
Cdd:pfam07653    2 GRVIFDYVGTDKNGLTLKKGDVVKVLGKdNDGWWEGETGGRVGLVPSTAVEEI 54

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 55.01 E-value: 2.28e-09

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTK-KDGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd12060    6 ARFNFKQTNEDELSVCKGDIIYVTRvEEGGWWEGTLNGKTGWFPSNYVR 54

First Src Homology 3 domain (SH3A) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CD2AP. SH3A binds to the PXXXPR motif present in c-Cbl and the cytoplasmic domain of cell adhesion protein CD2. Its interaction with CD2 anchors CD2 at sites of cell contact. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212986 Cd Length: 56 Bit Score: 54.85 E-value: 2.44e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQII-NVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12053    1 EYIVEYDYDAVHEDELTIRVGEIIrNVKKLEEEGWLEGELNGRRGMFPDNFVK 53

Src Homology 3 domain of C-terminal Src kinase; CSK is a cytoplasmic (or nonreceptor) tyr kinase containing the Src homology domains, SH3 and SH2, N-terminal to the catalytic tyr kinase domain. They negatively regulate the activity of Src kinases that are anchored to the plasma membrane. To inhibit Src kinases, CSK is translocated to the membrane via binding to specific transmembrane proteins, G-proteins, or adaptor proteins near the membrane. CSK catalyzes the tyr phosphorylation of the regulatory C-terminal tail of Src kinases, resulting in their inactivation. It is expressed in a wide variety of tissues and plays a role, as a regulator of Src, in cell proliferation, survival, and differentiation, and consequently, in cancer development and progression. In addition, CSK also shows Src-independent functions. It is a critical component in G-protein signaling, and plays a role in cytoskeletal reorganization and cell migration. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212703 [Multi-domain] Cd Length: 57 Bit Score: 54.62 E-value: 2.49e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLN-KEDPDWWKGE-VNGQVGLFPSNYVK 1210
Cdd:cd11769    3 ECIAKYNFNGASEEDLPFKKGDILTIVAvTKDPNWYKAKnKDGREGMIPANYVQ 56

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 54.58 E-value: 2.51e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1078 IAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQArgkkrQIGWFPANYV 1133
Cdd:cd11766    1 PAVVKFNYEAQREDELSLRKGDRVLVLEKSSDGWWRGECNG-----QVGWFPSNYV 51

C2 domain second repeat found in Multiple C2 domain and Transmembrane region Proteins (MCTP); MCTPs are involved in Ca2+ signaling at the membrane. MCTP is composed of a variable N-terminal sequence, three C2 domains, two transmembrane regions (TMRs), and a short C-terminal sequence. It is one of four protein classes that are anchored to membranes via a transmembrane region; the others being synaptotagmins, extended synaptotagmins, and ferlins. MCTPs are the only membrane-bound C2 domain proteins that contain two functional TMRs. MCTPs are unique in that they bind Ca2+ but not phospholipids. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 176022 [Multi-domain] Cd Length: 116 Bit Score: 56.50 E-value: 2.63e-09

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1600 VNVVEGIELKPCRSHGKSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQFSPDDFLGRTE 1679
Cdd:cd08376    4 IVLVEGKNLPPMDDNGLSDPYVKFRLGNEKYKSKVCSKTLNPQWLEQFDLHLFDDQSQILEIEVWDKDTGKKDEFIGRCE 83

                         90
                 ....*....|
gi 47717123 1680 IRVADIKKDQ 1689
Cdd:cd08376   84 IDLSALPREQ 93

C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 2 (Stac2); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac2 contains a single SH3 domain at the C-terminus unlike Stac1 and Stac3, which contain two C-terminal SH3 domains. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212918 Cd Length: 53 Bit Score: 54.57 E-value: 2.65e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGD-VILVTKKDGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd11985    2 YVALYKFLPQENNDLPLQPGDrVMVVDDSNEDWWKGKSGDRVGFFPANFVQ 52

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212849 [Multi-domain] Cd Length: 59 Bit Score: 54.61 E-value: 2.70e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1162 GMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEV--NGQVGLFPSNYVKL 1211
Cdd:cd11916    6 ALYSYAPQNDDELELRDGDIVDVMEKCDDGWFVGTSrrTKQFGTFPGNYVKL 57

Third Src homology 3 domain (or SH3C) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (SH3C) of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212925 Cd Length: 52 Bit Score: 54.25 E-value: 2.78e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKeDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11992    1 EYIALYPYSSSEPGDLTFNEGEEILVTQK-DGEWWTGSIEDRTGIFPSNYVR 51

C2 domain first repeat found in Multiple C2 domain and Transmembrane region Proteins (MCTP); MCTPs are involved in Ca2+ signaling at the membrane. MCTP is composed of a variable N-terminal sequence, three C2 domains, two transmembrane regions (TMRs), and a short C-terminal sequence. It is one of four protein classes that are anchored to membranes via a transmembrane region; the others being synaptotagmins, extended synaptotagmins, and ferlins. MCTPs are the only membrane-bound C2 domain proteins that contain two functional TMRs. MCTPs are unique in that they bind Ca2+ but not phospholipids. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-II topology.

Pssm-ID: 176007 [Multi-domain] Cd Length: 121 Bit Score: 56.52 E-value: 3.12e-09

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1597 RLMVNVVEGIELKPCRSHGKSNPYCEVTM-GSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLcITVFERDQFSPDDFL 1675
Cdd:cd04042    1 QLDIHLKEGRNLAARDRGGTSDPYVKFKYgGKTVYKSKTIYKNLNPVWDEKFTLPIEDVTQPLY-IKVFDYDRGLTDDFM 79

                         90
                 ....*....|....
gi 47717123 1676 GRTEIRVADIKKDQ 1689
Cdd:cd04042   80 GSAFVDLSTLELNK 93

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53, Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2 (BAIAP2)-Like proteins, and similar proteins; Proteins in this family include IRSp53, BAIAP2L1, BAIAP2L2, and similar proteins. They all contain an Inverse-Bin/Amphiphysin/Rvs (I-BAR) or IMD domain in addition to the SH3 domain. IRSp53, also known as BAIAP2, is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. BAIAP2L1, also called IRTKS (Insulin Receptor Tyrosine Kinase Substrate), serves as a substrate for the insulin receptor and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. IRSp53 and IRTKS also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. The SH3 domains of IRSp53 and IRTKS have been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212713 [Multi-domain] Cd Length: 57 Bit Score: 54.25 E-value: 3.14e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVL--EQQDMWWFGE--VQGQKGWFPKSYVK 967
Cdd:cd11779    2 RVKALYPHAAGGETQLSFEEGDVITLLgpEPRDGWHYGEneRSGRRGWFPIAYTE 56

Src Homology 3 domain of Bbc1 and similar domains; This subfamily is composed of Saccharomyces cerevisiae Bbc1p, also called Mti1p (Myosin tail region-interacting protein), and similar proteins. Bbc1p interacts with and regulates type I myosins in yeast, Myo3p and Myo5p, which are involved in actin cytoskeletal reorganization. It also binds and inhibits Las17, a WASp family protein that functions as an activator of the Arp2/3 complex. Bbc1p contains an N-terminal SH3 domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212820 [Multi-domain] Cd Length: 60 Bit Score: 54.66 E-value: 3.15e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGD-----KAGVFPSNYV 1055
Cdd:cd11887    5 KALYPYESDHEDDLNFDVGQLITVTEEeDADWYFGEYVDsngntKEGIFPKNFV 58

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 54.19 E-value: 3.26e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11995    2 QVIGMYDYTAQNDDELAFSKGQIINVLNKEDPdWWKGELNGQVGLFPSNYVKL 54

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 54.29 E-value: 3.44e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVK 967
Cdd:cd11786    2 AKALYNYEGKEPGDLSFKKGDIILLRKRIDEnWYHGECNGKQGFFPASYVQ 52

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 62.01 E-value: 3.46e-09

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    331 EEPVLEDEQQQLEKKLPVTfeDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERA------EQERKERERQEQERK 404
Cdd:TIGR02169  731 EEEKLKERLEELEEDLSSL--EQEIENVKSELKELEARIEELEEDLHKLEEALNDLEARlshsriPEIQAELSKLEEEVS 808

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    405 RQLELEKQLEKQRElerqreeerrkeierreaaKRELERQrQLEWERN----RRQELLNQRNKEQEDIVVLKAKKKTLEF 480
Cdd:TIGR02169  809 RIEARLREIEQKLN-------------------RLTLEKE-YLEKEIQelqeQRIDLKEQIKSIEKEIENLNGKKEELEE 868

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    481 ELEALNDKKHQLEGKLQDIRcrltTQRQEIESTNKSRELRIAEIthlQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSL 560
Cdd:TIGR02169  869 ELEELEAALRDLESRLGDLK----KERDELEAQLRELERKIEEL---EAQIEKKRKRLSELKAKLEALEEELSEIEDPKG 941

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    561 HRDSLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREihnkqqlqKQKSMEAERlkqKEQERKII 640
Cdd:TIGR02169  942 EDEEIPEEELSLEDVQAELQRVEEEIRALEPVNMLAIQEYEEVLKRLDELKE--------KRAKLEEER---KAILERIE 1010

                          330
                   ....*....|...
gi 47717123    641 ELEKQKEEAQRRA 653
Cdd:TIGR02169 1011 EYEKKKREVFMEA 1023

Src Homology 3 domain of Membrane Protein, Palmitoylated (or MAGUK p55 subfamily member) proteins; The MPP/p55 subfamily of MAGUK (membrane-associated guanylate kinase) proteins includes at least eight vertebrate members (MPP1-7 and CASK), four Drosophila proteins (Stardust, Varicose, CASK and Skiff), and other similar proteins; they all contain one each of the core of three domains characteristic of MAGUK proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, most members except for MPP1 contain N-terminal L27 domains and some also contain a Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. CASK has an additional calmodulin-dependent kinase (CaMK)-like domain at the N-terminus. Members of this subfamily are scaffolding proteins that play important roles in regulating and establishing cell polarity, cell adhesion, and synaptic targeting and transmission, among others. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212796 Cd Length: 61 Bit Score: 54.12 E-value: 3.66e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1163 MYDYTAQNDDE-------LAFNKGQIINVLNKEDPDWWK----GEVNGQVGLFPS 1206
Cdd:cd11862    5 LFDYDPEEDPLipckeagLSFKKGDILQIVNQDDPNWWQarkvGDPNGRAGLIPS 59

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 53.88 E-value: 3.93e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQKGWFPKSYVKL 968
Cdd:cd11781    2 ARALYPFKAQSAKELSLKKGDIIYIRRQIDKNWYeGEHNGRVGIFPASYVEI 53

Src homology 3 domain of Signal Transducing Adaptor Molecule 1; STAM1 is part of the endosomal sorting complex required for transport (ESCRT-0) and is involved in sorting ubiquitinated cargo proteins from the endosome. It may also be involved in the regulation of IL2 and GM-CSF mediated signaling, and has been implicated in neural cell survival. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212897 [Multi-domain] Cd Length: 55 Bit Score: 54.18 E-value: 4.01e-09

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11964    5 AIYDFEAAEDNELTFKAGDIItILDDSDPNWWKGETPQGTGLFPSNFV 52

Pleckstrin homology domain-containing family G member 7 pleckstrin homology (PH) domain; PLEKHG7 has a RhoGEF DH/double-homology domain in tandem with a PH domain which is involved in phospholipid binding. PLEKHG7 is proposed to functions as a guanine nucleotide exchange factor (GEF) and is involved in the regulation of Rho protein signal transduction. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 270065 Cd Length: 128 Bit Score: 56.52 E-value: 4.08e-09

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1464 LHSGKLYKAKSNK--ELYGFLFNDFLLLTQITKPLG-SSGTDKVFS---------PKSNLQYKMYKTPIFLNEVLVK--L 1529
Cdd:cd13245    3 LHEGPLTLIESGKtlDVYLFLFDDMLLITKMKKNLKkKKSSDSENSmpsleltplIKEGGSYTVYKQPIPLDRLCLHdvD 82

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1530 PTDPS--GDEPIFHISHIDR------VYTLRAESINERTAWVQKIK 1567
Cdd:cd13245   83 PNEATanGLKHAFVLVHLNRyqqvigVYTLQASSENTKQTWMSKLR 128

Second C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212894 [Multi-domain] Cd Length: 53 Bit Score: 54.07 E-value: 4.09e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLE-QQDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11961    2 AKALYDYDAAEDNELSFFENDKIINIEfVDDDWWLGECHGSRGLFPSNYVEL 53

Src Homology 3 domain of eumetazoan Peroxisomal biogenesis factor 13; PEX13 is a peroxin and is required for protein import into the peroxisomal matrix and membrane. It is an integral membrane protein that is essential for the localization of PEX14 and the import of proteins containing the peroxisome matrix targeting signals, PTS1 and PTS2. Mutations of the PEX13 gene in humans lead to a wide range of peroxisome biogenesis disorders (PBDs), the most severe of which is known as Zellweger syndrome (ZS), a severe multisystem disorder characterized by hypotonia, psychomotor retardation, and neuronal migration defects. PEX13 contains two transmembrane regions and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212798 Cd Length: 58 Bit Score: 54.17 E-value: 4.34e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKE----DPDWWKGEVNGQ-VGLFPSNYVKL 1211
Cdd:cd11864    3 RAEYDFVAESEDELSFRAGDKLRLAPKElqprVRGWLLATVDGQkIGLVPANYVKI 58

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 53.89 E-value: 4.40e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKDGD---WWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11875    4 VLFDYEAENEDELTLREGDIVTILSKDCEdkgWWKGELNGKRGVFPDNFVEP 55

Septal ring factor EnvC, activator of murein hydrolases AmiA and AmiB [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 443969 [Multi-domain] Cd Length: 377 Bit Score: 60.55 E-value: 4.44e-09

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  436 AAKRELER-QRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIestn 514
Cdd:COG4942   31 QLQQEIAElEKELAALKKEEKALLKQLAALERRIAALARRIRALEQELAALEAELAELEKEIAELRAELEAQKEEL---- 106

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  515 kSRELRIAEITHLQQQLQESQQMLG------RLIPEKQILNDQLKQVQQNSLHRDSLVTLKRALEAKelaRQHLRDQLDE 588
Cdd:COG4942  107 -AELLRALYRLGRQPPLALLLSPEDfldavrRLQYLKYLAPARREQAEELRADLAELAALRAELEAE---RAELEALLAE 182

                        170       180       190       200       210       220
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  589 VEKETRSKLQEIDIFNNQLKELreihNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRA 653
Cdd:COG4942  183 LEEERAALEALKAERQKLLARL----EKELAELAAELAELQQEAEELEALIARLEAEAAAAAERT 243

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. Also included in this subfamily is the second C-terminal SH3 domain of Rho guanine nucleotide exchange factor 37 (ARHGEF37), whose function is still unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212734 [Multi-domain] Cd Length: 57 Bit Score: 53.91 E-value: 4.48e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKED----PDWWKGEVNGQVGLFPSNY 1208
Cdd:cd11800    1 YYYALYTFEARSPGELSVTEGQVVTVLEKHDlkgnPEWWLVEDRGKQGYVPSNY 54

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the third SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212714 [Multi-domain] Cd Length: 55 Bit Score: 53.84 E-value: 4.55e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKG--EVNGQVGLFPSNYVK 1210
Cdd:cd11780    5 LYSYTPQNEDELELREGDIVYVMEKCDDGWFVGtsERTGLFGTFPGNYVA 54

C-terminal Src Homology 3 domain of the p67phox subunit of NADPH oxidase and similar proteins; This subfamily is composed of p67phox, NADPH oxidase activator 1 (Noxa1), and similar proteins. p67phox, also called Neutrophil cytosol factor 2 (NCF-2), and Noxa1 are homologs and are the cytosolic subunits of the phagocytic (Nox2) and nonphagocytic (Nox1) NADPH oxidase complexes, respectively. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox and Noxa1 play regulatory roles. p67phox contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. Noxa1 has a similar domain architecture except it is lacking the N-terminal SH3 domain. The TPR domain of both binds activated GTP-bound Rac, while the C-terminal SH3 domain of p67phox and Noxa1 binds the polyproline motif found at the C-terminus of p47phox and Noxo1, respectively. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212803 [Multi-domain] Cd Length: 53 Bit Score: 53.69 E-value: 5.15e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11870    1 QVVALHRYEAQGPEDLGFREGDTIDVLSEVNEAWLEGHSDGRVGIFPKCFVV 52

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 61.23 E-value: 5.21e-09

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   334 VLEDEQQQLEKKLpvtfEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLEraeQERKERerqeqeRKRQLELEKQL 413
Cdd:PRK03918  369 AKKEELERLKKRL----TGLTPEKLEKELEELEKAKEEIEEEISKITARIGELK---KEIKEL------KKAIEELKKAK 435

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   414 EKqrelerqreeerrkeierREAAKRELERQrqlewernRRQELLNQRNKEQEDIvvlKAKKKTLEFELEALNDKKHQLE 493
Cdd:PRK03918  436 GK------------------CPVCGRELTEE--------HRKELLEEYTAELKRI---EKELKEIEEKERKLRKELRELE 486

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   494 GKLQDIRcRLTTQRQ---EIEST-NKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQnslhrdslvtLK 569
Cdd:PRK03918  487 KVLKKES-ELIKLKElaeQLKELeEKLKKYNLEELEKKAEEYEKLKEKLIKLKGEIKSLKKELEKLEE----------LK 555

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   570 RALEAKELARQHLRDQLDEVEKETRSK-LQEIDIFNNQLKELREIHNK--------QQLQ-KQKSMEAERLKQKEQERKI 639
Cdd:PRK03918  556 KKLAELEKKLDELEEELAELLKELEELgFESVEELEERLKELEPFYNEylelkdaeKELErEEKELKKLEEELDKAFEEL 635

                         330       340       350       360
                  ....*....|....*....|....*....|....*....|....*.
gi 47717123   640 IELEKQKEEAQRRAQErdkqwLEHVQQEDEHQRPRKLHEEekLKRE 685
Cdd:PRK03918  636 AETEKRLEELRKELEE-----LEKKYSEEEYEELREEYLE--LSRE 674

Second C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212894 [Multi-domain] Cd Length: 53 Bit Score: 53.68 E-value: 5.43e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11961    4 ALYDYDAAEDNELSFFENDKIInIEFVDDDWWLGECHGSRGLFPSNYVEL 53

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 53.62 E-value: 5.62e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1080 QVIASYTATGPEQLTLAPGQLILIRKKNPG--GWWEGELQARgkkrqIGWFPANYV 1133
Cdd:cd12142    3 RVLFDYNPVAPDELALKKGDVIEVISKETEdeGWWEGELNGR-----RGFFPDNFV 53

Second Src homology 3 domain (or SH3B) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212922 [Multi-domain] Cd Length: 52 Bit Score: 53.57 E-value: 5.95e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPdWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11989    1 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 52

Src homology 3 domain of Yes Protein Tyrosine Kinase; Yes (or c-Yes) is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. c-Yes kinase is the cellular homolog of the oncogenic protein (v-Yes) encoded by the Yamaguchi 73 and Esh sarcoma viruses. It displays functional overlap with other Src subfamily members, particularly Src. It also shows some unique functions such as binding to occludins, transmembrane proteins that regulate extracellular interactions in tight junctions. Yes also associates with a number of proteins in different cell types that Src does not interact with, like JAK2 and gp130 in pre-adipocytes, and Pyk2 in treated pulmonary vein endothelial cells. Although the biological function of Yes remains unclear, it appears to have a role in regulating cell-cell interactions and vesicle trafficking in polarized cells. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212940 [Multi-domain] Cd Length: 58 Bit Score: 53.50 E-value: 6.66e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGE--VNGQVGLFPSNYV 1209
Cdd:cd12007    4 VALYDYEARTTEDLSFKKGERFQIINNTEGDWWEARsiATGKNGYIPSNYV 54

Domain of unknown function (DUF4659); This family of proteins is found in eukaryotes. Proteins in this family are typically between 427 and 674 amino acids in length. There are two completely conserved residues (D and I) that may be functionally important.

Pssm-ID: 464768 [Multi-domain] Cd Length: 374 Bit Score: 60.05 E-value: 6.85e-09

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    374 EQQRKEQERLAQLERAEQERKERERQEQ-ERKRQLELEKQLE------KQRELERQREEERRKEIERREAAKRELERQRQ 446
Cdd:pfam15558   20 EQRMRELQQQAALAWEELRRRDQKRQETlERERRLLLQQSQEqwqaekEQRKARLGREERRRADRREKQVIEKESRWREQ 99

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    447 LEWERNRRQELLNQRNKEQEdivvlkAKKKTLEFEL----EALNDKKHQLEGKLQDI--RCRLTTQRQEIESTNKSRELR 520
Cdd:pfam15558  100 AEDQENQRQEKLERARQEAE------QRKQCQEQRLkekeEELQALREQNSLQLQERleEACHKRQLKEREEQKKVQENN 173

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    521 IAEithlqqqlqesqqmlgrlipekqILNDQLKQVQQNSLHRDSLVTLKRALEAKelarqHLRDQldevekETRSKLQEI 600
Cdd:pfam15558  174 LSE-----------------------LLNHQARKVLVDCQAKAEELLRRLSLEQS-----LQRSQ------ENYEQLVEE 219

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    601 difnnQLKELREIHNKQQLQKQKSME-AERLKQKEQERK--IIELEKQK-EEAQRRAQERDKQWLEHVQQ-----EDEHQ 671
Cdd:pfam15558  220 -----RHRELREKAQKEEEQFQRAKWrAEEKEEERQEHKeaLAELADRKiQQARQVAHKTVQDKAQRARElnlerEKNHH 294

                          330
                   ....*....|....*.
gi 47717123    672 RPR-KLHEEEKLKREE 686
Cdd:pfam15558  295 ILKlKVEKEEKCHREG 310

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 53.00 E-value: 6.90e-09

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 47717123   1009 AMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:pfam14604    1 ALYPYEPKDDDELSLQRGDVITVIEEsEDGWWEGINTGRTGLVPANYVE 49

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 53.29 E-value: 7.08e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKD-GD--WWTGTVGDKAGVFPSNYV 1055
Cdd:cd12056    6 ALFHYEGTNEDELDFKEGEIILIISKDtGEpgWWKGELNGKEGVFPDNFV 55

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 53.09 E-value: 7.19e-09

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 47717123  741 KVVyyrALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11826    1 KVV---ALYDYTADKDDELSFQEGDIIYV-------TKKNDDGWYEGVLNGVTGLFPGNYVE 52

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 53.09 E-value: 7.54e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTVGD-KAGVFPSNYVRL 1057
Cdd:cd11819    3 KALYDYQAAEDNEISFVEGDIITqIEQIDEGWWLGVNAKgQKGLFPANYVEL 54

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 53.11 E-value: 7.54e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGKKrqiGWFPANYV 1133
Cdd:cd11793    2 VQCVHAYTAQQPDELTLEEGDVVNVLRKMPDGWYEGERLRDGER---GWFPSSYT 53

Src homology 3 domain of Endophilin-A; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain three endophilin-A isoforms (A1, A2, and A3). Endophilin-A proteins are enriched in the brain and play multiple roles in receptor-mediated endocytosis. They tubulate membranes and regulate calcium influx into neurons to trigger the activation of the endocytic machinery. They are also involved in the sorting of plasma membrane proteins, actin filament assembly, and the uncoating of clathrin-coated vesicles for fusion with endosomes. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212737 [Multi-domain] Cd Length: 55 Bit Score: 53.42 E-value: 7.57e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQKGWFPKSYVKLI 969
Cdd:cd11803    2 CCRALYDFEPENEGELGFKEGDIITLTNQIDENWYeGMVNGQSGFFPVNYVEVL 55

First Src homology 3 domain (or SH3A) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212770 [Multi-domain] Cd Length: 55 Bit Score: 53.13 E-value: 7.73e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQDM---WWFGEVQGQKGWFPKSYV 966
Cdd:cd11836    3 RALYAFEARNPDEISFQPGDIIQVDESQVAepgWLAGELKGKTGWFPANYV 53

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 60.93 E-value: 7.98e-09

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   336 EDEQQQLEKKLPVTFEDKKRENFErgnlELEKRRQALLEQQRKEQErlaQLERAEQERKERERQEQERKRQLELEKQLEK 415
Cdd:PTZ00121 1078 DFDFDAKEDNRADEATEEAFGKAE----EAKKTETGKAEEARKAEE---AKKKAEDARKAEEARKAEDARKAEEARKAED 1150

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   416 qrelerqreeERRKEIERREAAKRELERQRQLE----WERNRRQELLNQRN--KEQEDIVVLKAKKKTlEFELEALNDKK 489
Cdd:PTZ00121 1151 ----------AKRVEIARKAEDARKAEEARKAEdakkAEAARKAEEVRKAEelRKAEDARKAEAARKA-EEERKAEEARK 1219

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   490 HQLEGKLQDIRcRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIP--EKQILNDQLKQVQQ----NSLHRD 563
Cdd:PTZ00121 1220 AEDAKKAEAVK-KAEEAKKDAEEAKKAEEERNNEEIRKFEEARMAHFARRQAAIkaEEARKADELKKAEEkkkaDEAKKA 1298

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   564 SLVtlKRALEAKELARQHLR-DQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIEL 642
Cdd:PTZ00121 1299 EEK--KKADEAKKKAEEAKKaDEAKKKAEEAKKKADAAKKKAEEAKKAAEAAKAEAEAAADEAEAAEEKAEAAEKKKEEA 1376

                         330       340       350       360
                  ....*....|....*....|....*....|....*....|....*...
gi 47717123   643 EKQKEEAQRRAQERDKQwlEHVQQEDEHQRPR----KLHEEEKLKREE 686
Cdd:PTZ00121 1377 KKKADAAKKKAEEKKKA--DEAKKKAEEDKKKadelKKAAAAKKKADE 1422

MAP7 (E-MAP-115) family; The organization of microtubules varies with the cell type and is presumably controlled by tissue-specific microtubule-associated proteins (MAPs). The 115-kDa epithelial MAP (E-MAP-115/MAP7) has been identified as a microtubule-stabilising protein predominantly expressed in cell lines of epithelial origin. The binding of this microtubule associated protein is nucleotide independent.

Pssm-ID: 461709 [Multi-domain] Cd Length: 153 Bit Score: 56.20 E-value: 8.02e-09

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    366 EKRRQALLEQQRKEQERLAQLERAEQERKE-RERQEQERKRQLELEKQLEKQRELERQREEERrkeierreaAKRELERQ 444
Cdd:pfam05672   18 EKRRQAREQREREEQERLEKEEEERLRKEElRRRAEEERARREEEARRLEEERRREEEERQRK---------AEEEAEER 88

                           90       100       110       120       130
                   ....*....|....*....|....*....|....*....|....*....|.
gi 47717123    445 RQLEWERNRRQEllnQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGK 495
Cdd:pfam05672   89 EQREQEEQERLQ---KQKEEAEAKAREEAERQRQEREKIMQQEEQERLERK 136

C-terminal Src Homology 3 domain of NADPH oxidase activator 1; Noxa1 is a homolog of p67phox and is a cytosolic subunit of the nonphagocytic NADPH oxidase complex Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Noxa1 is co-expressed with Nox1 in colon, stomach, uterus, prostate, and vascular smooth muscle cells, consistent with its regulatory role. It does not interact with p40phox, unlike p67phox, making Nox1 activity independent of p40phox, unlike Nox2. Noxa1 contains TPR, PB1, and C-terminal SH3 domains, but lacks the central SH3 domain that is present in p67phox. The TPR domain binds activated GTP-bound Rac. The C-terminal SH3 domain binds the polyproline motif found at the C-terminus of Noxo1, a homolog of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212980 Cd Length: 53 Bit Score: 52.90 E-value: 8.77e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd12047    1 RMVAQHDYSAQGPEDLEFSQGDTIDILSEVNQEWLEGHCDGRIGIFPKCFA 51

C-terminal Src Homology 3 domain of the Nebulin family of proteins; Nebulin family proteins contain multiple nebulin repeats, and may contain an N-terminal LIM domain and/or a C-terminal SH3 domain. They have molecular weights ranging from 34 to 900 kD, depending on the number of nebulin repeats, and they all bind actin. They are involved in the regulation of actin filament architecture and function as stabilizers and scaffolds for cytoskeletal structures with which they associate, such as long actin filaments or focal adhesions. Nebulin family proteins that contain a C-terminal SH3 domain include the giant filamentous protein nebulin, nebulette, Lasp1, and Lasp2. Lasp2, also called LIM-nebulette, is an alternatively spliced variant of nebulette. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212723 [Multi-domain] Cd Length: 55 Bit Score: 53.09 E-value: 8.94e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTV---GdKAGVFPSNYVRL 1057
Cdd:cd11789    2 YRAMYDYAAADDDEVSFQEGDVIInVEIIDDGWMEGTVqrtG-QSGMLPANYVEL 55

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 1; ASAP1 is also called DDEF1 (Development and Differentiation Enhancing Factor 1), AMAP1, centaurin beta-4, or PAG2. an Arf GTPase activating protein (GAP) with activity towards Arf1 and Arf5 but not Arf6. However, it has been shown to bind GTP-Arf6 stably without GAP activity. It has been implicated in cell growth, migration, and survival, as well as in tumor invasion and malignancy. It binds paxillin and cortactin, two components of invadopodia which are essential for tumor invasiveness. It also binds focal adhesion kinase (FAK) and the SH2/SH3 adaptor CrkL. ASAP1 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212898 [Multi-domain] Cd Length: 57 Bit Score: 53.09 E-value: 9.88e-09

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQ---VGLFPSNYVKL 1211
Cdd:cd11965    1 RVKTIYDCQADNDDELTFVEGEVIIVTGEEDQEWWIGHIEGQperKGVFPVSFVHI 56

First Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212862 Cd Length: 54 Bit Score: 53.02 E-value: 1.02e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11929    6 LCNYRGHNPGDLKFNKGDVILLRRQLDENWYLGEINGVSGIFPASSVEV 54

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 52.59 E-value: 1.03e-08

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 47717123   1008 IAMYTYESSEQGDLTFQQGDVILVT-KKDGDWWTGTV-GDKAGVFPS 1052
Cdd:pfam00018    1 VALYDYTAQEPDELSFKKGDIIIVLeKSEDGWWKGRNkGGKEGLIPS 47

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 52.77 E-value: 1.04e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11828    2 AEALWDHVTMDPEELGFKAGDVIEVLDMSDKdWWWGSIRDEEGWFPASFVRL 53

Third N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212730 Cd Length: 51 Bit Score: 52.74 E-value: 1.06e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*
gi 47717123 1165 DYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11796    7 DLSAQLDEELDLREGDVVTITGILDKGWFRGELNGRRGIFPEGFV 51

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 52.80 E-value: 1.12e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwvdesqtGEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11840    3 IALFPYTAQNEDELSFQKGDIINVLSK-------DDPDWWRGELNGQTGLFPSNYVE 52

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 3 (Stac3); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212919 [Multi-domain] Cd Length: 53 Bit Score: 52.60 E-value: 1.17e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTK-KDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11986    2 FVALYRFKALEKDDLDFHPGERITVIDdSNEEWWRGKIGEKTGYFPMNFI 51

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 53.02 E-value: 1.18e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVKGEwvDESQTGEPGWLGGELKGKTGWFPANY 800
Cdd:cd12058    2 WTALYDYEASGEDELSLRRGDVVEVLSQ--DAAVSGDDGWWAGKIRHRLGIFPANY 55

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 52.64 E-value: 1.27e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKD----GD--WWTGTVGDKAGVFPSNYV 1055
Cdd:cd12058    4 ALYDYEASGEDELSLRRGDVVEVLSQDaavsGDdgWWAGKIRHRLGIFPANYV 56

C-terminal Src Homology 3 domain of the Nebulin family of proteins; Nebulin family proteins contain multiple nebulin repeats, and may contain an N-terminal LIM domain and/or a C-terminal SH3 domain. They have molecular weights ranging from 34 to 900 kD, depending on the number of nebulin repeats, and they all bind actin. They are involved in the regulation of actin filament architecture and function as stabilizers and scaffolds for cytoskeletal structures with which they associate, such as long actin filaments or focal adhesions. Nebulin family proteins that contain a C-terminal SH3 domain include the giant filamentous protein nebulin, nebulette, Lasp1, and Lasp2. Lasp2, also called LIM-nebulette, is an alternatively spliced variant of nebulette. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212723 [Multi-domain] Cd Length: 55 Bit Score: 52.70 E-value: 1.34e-08

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVmVKGEWVDEsqtgepGWLGGELK--GKTGWFPANYAEK 803
Cdd:cd11789    2 YRAMYDYAAADDDEVSFQEGDVI-INVEIIDD------GWMEGTVQrtGQSGMLPANYVEL 55

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 52.33 E-value: 1.34e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQD-MWWFGEVQGQK-GWFPKSYVK 967
Cdd:cd11825    2 VKALYDYRAQRPDELSFCKHAIITNVEKEDgGWWRGDYGGKKqKWFPANYVE 53

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 52.78 E-value: 1.34e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKDGD-----WWTGTVGDKAGVFPS 1052
Cdd:cd11762    4 ALYDYEAQSDEELSFPEGAIIRILRKDDNgvddgWWEGEFNGRVGVFPS 52

Src homology 3 domain of Ubiquitin-associated and SH3 domain-containing proteins, also called TULA (T cell Ubiquitin LigAnd) family of proteins; UBASH3 or TULA proteins are also referred to as Suppressor of T cell receptor Signaling (STS) proteins. They contain an N-terminal UBA domain, a central SH3 domain, and a C-terminal histidine phosphatase domain. They bind c-Cbl through the SH3 domain and to ubiquitin via UBA. In some vertebrates, there are two TULA family proteins, called UBASH3A (also called TULA or STS-2) and UBASH3B (also called TULA-2 or STS-1), which show partly overlapping as well as distinct functions. UBASH3B is widely expressed while UBASH3A is only found in lymphoid cells. UBASH3A facilitates apoptosis induced in T cells through its interaction with the apoptosis-inducing factor AIF. UBASH3B is an active phosphatase while UBASH3A is not. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212725 [Multi-domain] Cd Length: 59 Bit Score: 52.69 E-value: 1.37e-08

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVKGEWVDESQTgepGWLGG--ELKGKTGWFPANYAEK 803
Cdd:cd11791    2 LRVLYPYTPQEEDELELVPGDYIYVSPEELDSSSD---GWVEGtsWLTGCSGLLPENYTEK 59

Src homology 3 domain of Endophilin-A; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain three endophilin-A isoforms (A1, A2, and A3). Endophilin-A proteins are enriched in the brain and play multiple roles in receptor-mediated endocytosis. They tubulate membranes and regulate calcium influx into neurons to trigger the activation of the endocytic machinery. They are also involved in the sorting of plasma membrane proteins, actin filament assembly, and the uncoating of clathrin-coated vesicles for fusion with endosomes. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212737 [Multi-domain] Cd Length: 55 Bit Score: 52.65 E-value: 1.39e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVKGEwVDESqtgepgWLGGELKGKTGWFPANYAE 802
Cdd:cd11803    3 CRALYDFEPENEGELGFKEGDIITLTNQ-IDEN------WYEGMVNGQSGFFPVNYVE 53

Src homology 3 domain of High osmolarity signaling protein Sho1p; Sho1p (or Sho1), also called SSU81 (Suppressor of SUA8-1 mutation), is a yeast membrane protein that regulates adaptation to high salt conditions by activating the HOG (high-osmolarity glycerol) pathway. High salt concentrations lead to the localization to the membrane of the MAPKK Pbs2, which is then activated by the MAPKK Ste11 and in turn, activates the MAPK Hog1. Pbs2 is localized to the membrane though the interaction of its PxxP motif with the SH3 domain of Sho1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212789 [Multi-domain] Cd Length: 55 Bit Score: 52.42 E-value: 1.40e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1162 GMYDYTAQNDD--ELAFNKGQIINVLNKEDpDWWKGEV-NGQVGLFPSNYVKL 1211
Cdd:cd11855    4 ALYPYDASPDDpnELSFEKGEILEVSDTSG-KWWQARKsNGETGICPSNYLQL 55

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 52.29 E-value: 1.46e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11996    2 QVIAMYDYTANNEDELSFSKGQLINVLNKDDPdWWQGEINGVTGLFPSNYVKM 54

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1 and similar proteins; This subfamily is composed of SKAP1, SKAP2, and similar proteins. SKAP1 and SKAP2 are immune cell-specific adaptor proteins that play roles in T- and B-cell adhesion, respectively, and are thus important in the migration of T- and B-cells to sites of inflammation and for movement during T-cell conjugation with antigen-presenting cells. Both SKAP1 and SKAP2 bind to ADAP (adhesion and degranulation-promoting adaptor protein), among many other binding partners. They contain a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212800 Cd Length: 53 Bit Score: 52.43 E-value: 1.48e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1162 GMYDYTAQNDDELAFNKGQIINVLNKE--DPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11866    4 GLWDCSGNEPDELSFKRGDLIYIISKEydSFGWWVGELNGKVGLVPKDYL 53

First Src Homology 3 domain of SH3 domain containing ring finger protein 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212860 Cd Length: 54 Bit Score: 52.26 E-value: 1.52e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11927    5 ALYNYEGKEPGDLKFSKGDIIILRRQvDENWYHGEVNGIHGFFPTNFVQI 54

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 52.42 E-value: 1.54e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11959    2 AVALYDYQAADDDEISFDPDDIITNIEMIDEgWWRGVCRGKYGLFPANYVEL 53

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 1 (PACSIN1) and PACSIN 2; PACSIN 1 or Syndapin I (Synaptic dynamin-associated protein I) is expressed specifically in the brain and is localized in neurites and synaptic boutons. It binds the brain-specific proteins dynamin I, synaptojanin, synapsin I, and neural Wiskott-Aldrich syndrome protein (nWASP), and functions as a link between the cytoskeletal machinery and synaptic vesicle endocytosis. PACSIN 1 interacts with huntingtin and may be implicated in the neuropathology of Huntington's disease. PACSIN 2 or Syndapin II is expressed ubiquitously and is involved in the regulation of tubulin polymerization. It associates with Golgi membranes and forms a complex with dynamin II which is crucial in promoting vesicle formation from the trans-Golgi network. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212931 [Multi-domain] Cd Length: 56 Bit Score: 52.26 E-value: 1.60e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPD-WWKGEV-NGQVGLFPSNYVK 1210
Cdd:cd11998    2 RVRALYDYDGQEQDELSFKAGDELTKLEDEDEQgWCKGRLdSGQVGLYPANYVE 55

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 52.33 E-value: 1.63e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILV-TKKDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11963    6 ALYDFEAVEDNELTFKHGEIIIVlDDSDANWWKGENHRGVGLFPSNFV 53

C2 domain present in cytosolic PhosphoLipase A2 (cPLA2); A single copy of the C2 domain is present in cPLA2 which releases arachidonic acid from membranes initiating the biosynthesis of potent inflammatory mediators such as prostaglandins, leukotrienes, and platelet-activating factor. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members of this cd have a type-II topology.

Pssm-ID: 176001 [Multi-domain] Cd Length: 119 Bit Score: 54.19 E-value: 1.63e-08

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1616 KSNPYCEV---TMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQFsPDDFLGRTEIRVADIKKDQgsk 1692
Cdd:cd04036   20 TPDCYVELwlpTASDEKKRTKTIKNSINPVWNETFEFRIQSQVKNVLELTVMDEDYV-MDDHLGTVLFDVSKLKLGE--- 95

                         90       100
                 ....*....|....*....|....*
gi 47717123 1693 gPVTKCLLLHEVPTGEIVVRLDLQL 1717
Cdd:cd04036   96 -KVRVTFSLNPQGKEELEVEFLLEL 119

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 52.08 E-value: 1.69e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTK-KDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11820    5 ALYDFEAAEDNELTFKAGEIITVLDdSDPNWWKGSNHRGEGLFPANFV 52

Second Src homology 3 domain of Rab3-interacting molecules (RIMs) binding proteins; RIMs binding proteins (RBPs, RIM-BPs) associate with calcium channels present in photoreceptors, neurons, and hair cells; they interact simultaneously with specific calcium channel subunits, and active zone proteins, RIM1 and RIM2. RIMs are part of the matrix at the presynaptic active zone and are associated with synaptic vesicles through their interaction with the small GTPase Rab3. RIM-BPs play a role in regulating synaptic transmission by serving as adaptors and linking calcium channels with the synaptic vesicle release machinery. RIM-BPs contain three SH3 domains and two to three fibronectin III repeats. Invertebrates contain one, while vertebrates contain at least two RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called peripheral-type benzodiazapine receptor associated protein 1 (PRAX-1). Mammals contain a third protein, RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly expressed in the brain where they display overlapping but distinct expression patterns, while RIM-BP3 is almost exclusively expressed in the testis and is essential in spermiogenesis. The SH3 domains of RIM-BPs bind to the PxxP motifs of RIM1, RIM2, and L-type (alpha1D) and N-type (alpha1B) calcium channel subunits. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212945 Cd Length: 62 Bit Score: 52.29 E-value: 1.73e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1161 IGMYDYTAQ----NDD----ELAFNKGQIINVLNKEDPD-WWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12012    3 VALFDYDPLtmspNPDaaeeELPFKEGQLIKVYGDKDADgFYLGEINGRRGLVPCNMVS 61

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 52.21 E-value: 1.79e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123   1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGElqaRGKKRqiGWFPANYVKLL 1136
Cdd:pfam07653    2 GRVIFDYVGTDKNGLTLKKGDVVKVLGKDNDGWWEGE---TGGRV--GLVPSTAVEEI 54

exonuclease SbcC; All proteins in this family for which functions are known are part of an exonuclease complex with sbcD homologs. This complex is involved in the initiation of recombination to regulate the levels of palindromic sequences in DNA. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

Pssm-ID: 129705 [Multi-domain] Cd Length: 1042 Bit Score: 59.60 E-value: 1.80e-08

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    342 LEKKLPVTFEDKKRENFERGNLELEKRRQALLEQQRKEQ-----ERLAQLERAEQERkeRERQEQERKRQLELEKQLEKQ 416
Cdd:TIGR00618  175 LDQYTQLALMEFAKKKSLHGKAELLTLRSQLLTLCTPCMpdtyhERKQVLEKELKHL--REALQQTQQSHAYLTQKREAQ 252

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    417 relerqreeerrkeierreaaKRELERQRQLEWERNRRQELLNQ--RNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEG 494
Cdd:TIGR00618  253 ---------------------EEQLKKQQLLKQLRARIEELRAQeaVLEETQERINRARKAAPLAAHIKAVTQIEQQAQR 311

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    495 KLQDIRCRLTT-----------QRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQI-LNDQLKQVQQNSLHR 562
Cdd:TIGR00618  312 IHTELQSKMRSrakllmkraahVKQQSSIEEQRRLLQTLHSQEIHIRDAHEVATSIREISCQQHtLTQHIHTLQQQKTTL 391

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    563 DSLVTLKRALEAKELARQHLRDQLDEVEKETRSKL------QEIDIFNNQLKELrEIHNKQQLQKQKSMEAERLKQKEQE 636
Cdd:TIGR00618  392 TQKLQSLCKELDILQREQATIDTRTSAFRDLQGQLahakkqQELQQRYAELCAA-AITCTAQCEKLEKIHLQESAQSLKE 470

                          330       340       350       360
                   ....*....|....*....|....*....|....*....|....*....
gi 47717123    637 RKiiELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRP---RKLHEEEKL 682
Cdd:TIGR00618  471 RE--QQLQTKEQIHLQETRKKAVVLARLLELQEEPCPlcgSCIHPNPAR 517

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 51.99 E-value: 1.86e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANYAEKI 804
Cdd:cd12061    3 RAKFNFQQTNEDELSFSKGDVIHV-------TRVEEGGWWEGTHNGRTGWFPSNYVREI 54

Src Homology 3 domain of Small G protein Signaling Modulator 3; SGSM3 is also called Merlin-associated protein (MAP), RUN and SH3 domain-containing protein (RUSC3), RUN and TBC1 domain-containing protein 3 (RUTBC3), Rab GTPase-activating protein 5 (RabGAP5), or Rab GAP-like protein (RabGAPLP). It is expressed ubiquitously and functions as a regulator of small G protein RAP- and RAB-mediated neuronal signaling. It is involved in modulating NGF-mediated neurite outgrowth and differentiation. It also interacts with the tumor suppressor merlin and may play a role in the merlin-associated suppression of cell growth. SGSM3 contains TBC, SH3, and RUN domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212747 Cd Length: 53 Bit Score: 52.12 E-value: 1.93e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1165 DYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11813    7 DFERHDDDELGFRKNDIITIISQKDEHCWVGELNGLRGWFPAKFVEL 53

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 52.23 E-value: 2.00e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11928    5 ALYSYEGKEPGDLKFNKGDIIILRRKvDENWYHGELNGCHGFLPASYIQC 54

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRB2 binds to Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, as well as to the proline-rich C-terminus of FGRF2. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212882 [Multi-domain] Cd Length: 53 Bit Score: 52.15 E-value: 2.09e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd11949    4 ALFDFDPQEDGELGFRRGDFIeVMDNSDPNWWKGACHGQTGMFPRNYVT 52

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212777 [Multi-domain] Cd Length: 53 Bit Score: 52.04 E-value: 2.11e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMvKGEWVDESqtgepGWLGGELKGKTGWFPANYAE 802
Cdd:cd11843    3 RALYDYEGQESDELSFKAGDILT-KLEEEDEQ-----GWCKGRLDGRVGLYPANYVE 53

Third Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212836 [Multi-domain] Cd Length: 59 Bit Score: 51.98 E-value: 2.16e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNK--EDPDWWKGE-VNGQVGLFPSNYV 1209
Cdd:cd11903    6 LYPFSSVTEEELNFEKGETMEVIEKpeNDPEWWKCKnSRGQVGLVPKNYV 55

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 51.88 E-value: 2.30e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1081 VIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELqaRGKKrqiGWFPANYVK 1134
Cdd:cd11873    4 VEFDYDAEEPDELTLKVGDIITNVKKMEEGWWEGTL--NGKR---GMFPDNFVK 52

C2 domain first repeat; fungal group; C2 domains were first identified in Protein Kinase C (PKC). C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176006 [Multi-domain] Cd Length: 111 Bit Score: 53.80 E-value: 2.31e-08

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1615 GKSNPYCEVTM---GSQCHITKTIQDTLNPKWNSNCqfFI----RDLE-QEVLCITVFERDQFSPDDFLGRTEIRVADIK 1686
Cdd:cd04041   21 GSSDPYVTASFakfGKPLYSTRIIRKDLNPVWEETW--FVlvtpDEVKaGERLSCRLWDSDRFTADDRLGRVEIDLKELI 98


                 ..
gi 47717123 1687 KD 1688
Cdd:cd04041   99 ED 100

Second Src Homology 3 domain of FCH and double SH3 domains protein 1; FCHSD1 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212828 Cd Length: 58 Bit Score: 51.89 E-value: 2.33e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1162 GMYDYTAQNDDELAFNKGQIINVLNKE----DPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11895    4 ALYSYTGQSPEELSFPEGALIRLLPRAqdgvDDGFWRGEFGGRVGVFPSLLVE 56

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 51.90 E-value: 2.37e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEV-----QGQKGWFPKSY 965
Cdd:cd11883    3 VALYDFTPKSKNQLSFKAGDIIYVLNKDPSgWWDGVIisssgKVKRGWFPSNY 55

Domain of unknown function (DUF4670); This family of proteins is found in eukaryotes. Proteins in this family are typically between 373 and 763 amino acids in length.

Pssm-ID: 464815 [Multi-domain] Cd Length: 522 Bit Score: 58.81 E-value: 2.56e-08

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    587 DEVEKETRSKLQEIDIFNNQLKELR----EIHNKQQLQKQKSMEAERLKQKEQERKIIEL--EKQKEEAQRRAQERDKQW 660
Cdd:pfam15709  376 EELELEQQRRFEEIRLRKQRLEEERqrqeEEERKQRLQLQAAQERARQQQEEFRRKLQELqrKKQQEEAERAEAEKQRQK 455

                           90       100       110       120
                   ....*....|....*....|....*....|....*....|....
gi 47717123    661 LEHVQQEDEHQRPRKLHEEEKLkrEESVKKKDGEEKGKQEAQDK 704
Cdd:pfam15709  456 ELEMQLAEEQKRLMEMAEEERL--EYQRQKQEAEEKARLEAEER 497

Src Homology 3 (SH3) domain of Inhibitor of ASPP protein (iASPP); iASPP, also called RelA-associated inhibitor (RAI), is an oncoprotein that inhibits the apoptotic transactivation potential of p53. It is upregulated in human breast cancers expressing wild-type p53, in acute leukemias regardless of the p53 mutation status, as well as in ovarian cancer where it is associated with poor patient outcome and chemoresistance. iASPP is also a binding partner and negative regulator of p65RelA, which promotes cell proliferation and inhibits apoptosis; p65RelA has the opposite effect on cell growth compared to the p53 family. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of iASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212885 [Multi-domain] Cd Length: 56 Bit Score: 51.85 E-value: 2.65e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNK--EDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11952    3 VYALWDYSAEFPDELSFKEGDMVTVLRKdgEGTDWWWASLCGREGYVPRNYFGL 56

Src homology 3 domain of Src kinase-like Protein Tyrosine Kinases; Src subfamily members include Src, Lck, Hck, Blk, Lyn, Fgr, Fyn, Yrk, Yes, and Brk. Src (or c-Src) proteins are cytoplasmic (or non-receptor) PTKs which are anchored to the plasma membrane. They contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation sites. Src proteins are involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. They were identified as the first proto-oncogene products, and they regulate cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Src kinases are overexpressed in a variety of human cancers, making them attractive targets for therapy. They are also implicated in acute inflammatory responses and osteoclast function. Src, Fyn, Yes, and Yrk are widely expressed, while Blk, Lck, Hck, Fgr, Lyn, and Brk show a limited expression pattern. This subfamily also includes Drosophila Src42A, Src oncogene at 42A (also known as Dsrc41) which accumulates at sites of cell-cell or cell-matrix adhesion, and participates in Drosphila development and wound healing. It has been shown to promote tube elongation in the tracheal system, is essential for proper cell-cell matching during dorsal closure, and regulates cell-cell contacts in developing Drosophila eyes. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212779 [Multi-domain] Cd Length: 52 Bit Score: 51.43 E-value: 2.72e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTKK-DGDWW------TGtvgdKAGVFPSNY 1054
Cdd:cd11845    2 YVALYDYEARTDDDLSFKKGDRLQILDDsDGDWWlarhlsTG----KEGYIPSNY 52

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 51.44 E-value: 2.73e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 47717123   1007 FIAMYTYESSEQGDLTFQQGDVILVTKKD-GDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:pfam07653    2 GRVIFDYVGTDKNGLTLKKGDVVKVLGKDnDGWWEGETGGRVGLVPSTAVEE 53

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 51.82 E-value: 2.76e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1010 MYTYESSEQGDLTFQQGDVILVTKK---DGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd12057    5 LFPYEAQNEDELTIKEGDIVTLISKdciDAGWWEGELNGRRGVFPDNFVKL 55

Src Homology 3 domain of Myosin XV; This subfamily is composed of proteins with similarity to Myosin XVa. Myosin XVa is an unconventional myosin that is critical for the normal growth of mechanosensory stereocilia of inner ear hair cells. Mutations in the myosin XVa gene are associated with nonsyndromic hearing loss. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212817 [Multi-domain] Cd Length: 56 Bit Score: 51.56 E-value: 2.79e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKE---DPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11884    2 VVAVRAYITRDQTLLSFHKGDVIKLLPKEgplDPGWLFGTLDGRSGAFPKEYV 54

Src homology 3 domain of Endophilin-A; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain three endophilin-A isoforms (A1, A2, and A3). Endophilin-A proteins are enriched in the brain and play multiple roles in receptor-mediated endocytosis. They tubulate membranes and regulate calcium influx into neurons to trigger the activation of the endocytic machinery. They are also involved in the sorting of plasma membrane proteins, actin filament assembly, and the uncoating of clathrin-coated vesicles for fusion with endosomes. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212737 [Multi-domain] Cd Length: 55 Bit Score: 51.49 E-value: 2.79e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11803    5 ALYDFEPENEGELGFKEGDIItLTNQIDENWYEGMVNGQSGFFPVNYV 52

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 51.43 E-value: 2.91e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd12052    1 EAIVEFDYKAQHEDELTITVGDIITkIKKDDGGWWEGEIKGRRGLFPDNFVR 52

Src Homology 3 domain of Amphiphysin and related domains; Amphiphysins function primarily in endocytosis and other membrane remodeling events. They exist in several isoforms and mammals possess two amphiphysin proteins from distinct genes. Amphiphysin I proteins, enriched in the brain and nervous system, contain domains that bind clathrin, Adaptor Protein complex 2 (AP2), dynamin, and synaptojanin. They function in synaptic vesicle endocytosis. Human autoantibodies to amphiphysin I hinder GABAergic signaling and contribute to the pathogenesis of paraneoplastic stiff-person syndrome. Some amphiphysin II isoforms, also called Bridging integrator 1 (Bin1), are localized in many different tissues and may function in intracellular vesicle trafficking. In skeletal muscle, Bin1 plays a role in the organization and maintenance of the T-tubule network. Mutations in Bin1 are associated with autosomal recessive centronuclear myopathy. Amphiphysins contain an N-terminal BAR domain with an additional N-terminal amphipathic helix (an N-BAR), a variable central domain, and a C-terminal SH3 domain. The SH3 domain of amphiphysins bind proline-rich motifs present in binding partners such as dynamin, synaptojanin, and nsP3. It also belongs to a subset of SH3 domains that bind ubiquitin in a site that overlaps with the peptide binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212724 [Multi-domain] Cd Length: 64 Bit Score: 51.94 E-value: 2.97e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPD-----WWKG--EVNGQVGLFPSNYVK 1210
Cdd:cd11790    9 HDYTAEDTDELTFEKGDVILVIPFDDPEeqdegWLMGvkESTGCRGVFPENFTE 62

Src Homology 3 domain of Nephrocystin (or Nephrocystin-1); Nephrocystin contains an SH3 domain involved in signaling pathways that regulate cell adhesion and cytoskeletal organization. It is a protein that in humans is associated with juvenile nephronophthisis, an inherited kidney disease characterized by renal fibrosis that lead to chronic renal failure in children. It is localized in cell-cell junctions in renal duct cells, and is known to interact with Ack1, an activated Cdc42-associated kinase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212704 [Multi-domain] Cd Length: 54 Bit Score: 51.54 E-value: 3.15e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGE-VNGQVGLFPSNYVKL 1211
Cdd:cd11770    2 YEALSDFQAEQEGDLSFKKGEVLRIISKRADGWWLAEnSKGNRGLVPKTYLKV 54

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 51.58 E-value: 3.37e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPG--GWWEGELQARgkkrqIGWFPANYVKL 1135
Cdd:cd11875    2 ARVLFDYEAENEDELTLREGDIVTILSKDCEdkGWWKGELNGK-----RGVFPDNFVEP 55

Second Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the second SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212716 [Multi-domain] Cd Length: 53 Bit Score: 51.20 E-value: 3.43e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11782    6 YNFNADTGVELSFRKGDVITLTRRVDENWYEGRIGGRQGIFPVSYVQ 52

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding proteins; CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes including migration, chemotaxis, apoptosis, differentiation, and progenitor cell function. They mediate the signaling of integrins at focal adhesions where they localize, and thus, regulate cell invasion and survival. Over-expression of these proteins is implicated in poor prognosis, increased metastasis, and resistance to chemotherapeutics in many cancers such as breast, lung, melanoma, and glioblastoma. CAS proteins have also been linked to the pathogenesis of inflammatory disorders, Alzheimer's, Parkinson's, and developmental defects. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. Vertebrates contain four CAS proteins: BCAR1 (or p130Cas), NEDD9 (or HEF1), EFS (or SIN), and CASS4 (or HEPL). The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212778 Cd Length: 56 Bit Score: 51.58 E-value: 3.47e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPD---WWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11844    5 LYDNVAESPDELAFRRGDILTVLEQNTAGlegWWLCSLRGRQGIAPGNRLKL 56

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor 2; ASEF2, also called Spermatogenesis-associated protein 13 (SPATA13), is a GEF that localizes with actin at the leading edge of cells and is important in cell migration and adhesion dynamics. GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF2 can activate both Rac 1 and Cdc42, but only Rac1 activation is necessary for increased cell migration and adhesion turnover. Together with APC (adenomatous polyposis coli) and Neurabin2, a scaffold protein that binds F-actin, it is involved in regulating HGF-induced cell migration. ASEF2 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212907 Cd Length: 54 Bit Score: 51.22 E-value: 3.67e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11974    6 LWDHVTMDDQELAFKAGDVIRVLEASNKDWWWGRNEDREAWFPASFVRL 54

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 51.46 E-value: 3.71e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11928    6 LYSYEGKEPGDLKFNKGDIIILRRKVDENWYHGELNGCHGFLPASYIQC 54

Myosin tail; The myosin molecule is a multi-subunit complex made up of two heavy chains and four light chains it is a fundamental contractile protein found in all eukaryote cell types. This family consists of the coiled-coil myosin heavy chain tail region. The coiled-coil is composed of the tail from two molecules of myosin. These can then assemble into the macromolecular thick filament. The coiled-coil region provides the structural backbone the thick filament.

Pssm-ID: 460256 [Multi-domain] Cd Length: 1081 Bit Score: 58.65 E-value: 3.81e-08

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    366 EKRRQALLEQQRKEQERLAQlerAEQERKERERQEQerkrQLELEK-QLEKQRELERQREEERRKEIERREAAKRELER- 443
Cdd:pfam01576    4 EEEMQAKEEELQKVKERQQK---AESELKELEKKHQ----QLCEEKnALQEQLQAETELCAEAEEMRARLAARKQELEEi 76

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    444 ----QRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTT---QRQEIESTNKS 516
Cdd:pfam01576   77 lhelESRLEEEEERSQQLQNEKKKMQQHIQDLEEQLDEEEAARQKLQLEKVTTEAKIKKLEEDILLledQNSKLSKERKL 156

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    517 RELRIAEITHLQQQLQESQQMLGRLIPEKQI----LNDQLKQVQQNslhRDSLVTLKRALEAK--ELARQH--------- 581
Cdd:pfam01576  157 LEERISEFTSNLAEEEEKAKSLSKLKNKHEAmisdLEERLKKEEKG---RQELEKAKRKLEGEstDLQEQIaelqaqiae 233

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    582 LRDQLDEVEKETRSKLQEID----IFNNQLKELREIHNkQQLQKQKSMEAERL--KQKEQERKII--ELEKQKEEAQrra 653
Cdd:pfam01576  234 LRAQLAKKEEELQAALARLEeetaQKNNALKKIRELEA-QISELQEDLESERAarNKAEKQRRDLgeELEALKTELE--- 309

                          330       340       350
                   ....*....|....*....|....*....|....
gi 47717123    654 qerDKQWLEHVQQEDEHQRPRKLHEEEKLKREES 687
Cdd:pfam01576  310 ---DTLDTTAAQQELRSKREQEVTELKKALEEET 340

N-terminal Src Homology 3 domain of Ct10 Regulator of Kinase adaptor proteins; CRK adaptor proteins consists of SH2 and SH3 domains, which bind tyrosine-phosphorylated peptides and proline-rich motifs, respectively. They function downstream of protein tyrosine kinases in many signaling pathways started by various extracellular signals, including growth and differentiation factors. Cellular CRK (c-CRK) contains a single SH2 domain, followed by N-terminal and C-terminal SH3 domains. It is involved in the regulation of many cellular processes including cell growth, motility, adhesion, and apoptosis. CRK has been implicated in the malignancy of various human cancers. The N-terminal SH3 domain of CRK binds a number of target proteins including DOCK180, C3G, SOS, and cABL. The CRK family includes two alternatively spliced protein forms, CRKI and CRKII, that are expressed by the CRK gene, and the CRK-like (CRKL) protein, which is expressed by a distinct gene (CRKL). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212692 [Multi-domain] Cd Length: 55 Bit Score: 51.21 E-value: 3.95e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGE-VNGQVGLFPSNYV 1209
Cdd:cd11758    3 VRALFDFPGNDDEDLPFKKGEILTVIRKPEEQWWNARnSEGKTGMIPVPYV 53

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 51.54 E-value: 3.97e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANYAEKI 804
Cdd:cd12060    5 KARFNFKQTNEDELSVCKGDIIYV-------TRVEEGGWWEGTLNGKTGWFPSNYVREI 56

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 51.05 E-value: 4.17e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM---WWFGEVQGQKGWFPKSYVKLI 969
Cdd:cd12057    1 YCKVLFPYEAQNEDELTIKEGDIVTLISKDCIdagWWEGELNGRRGVFPDNFVKLL 56

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 51.05 E-value: 4.69e-08

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIV-MVKGEWVDesqtgePGWLGGELKGKTGWFPANYAE 802
Cdd:cd12057    1 YCKVLFPYEAQNEDELTIKEGDIVtLISKDCID------AGWWEGELNGRRGVFPDNFVK 54

Src homology 3 domain of Blk Protein Tyrosine Kinase; Blk is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. It is expressed specifically in B-cells and is involved in pre-BCR (B-cell receptor) signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212942 [Multi-domain] Cd Length: 54 Bit Score: 50.97 E-value: 4.76e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGDWWTGT--VGDKAGVFPSNYV 1055
Cdd:cd12009    3 IAQYDFVPSNERDLQLKKGEKLQVLKSDGEWWLAKslTTGKEGYIPSNYV 52

Second or C-terminal Src homology 3 domain of NADPH oxidase (Nox) Organizing protein 1; Nox Organizing protein 1 (NoxO1) is a critical regulator of enzyme kinetics of the nonphagocytic NADPH oxidase Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Nox1 is expressed in colon, stomach, uterus, prostate, and vascular smooth muscle cells. NoxO1 is involved in targeting activator subunits (such as NoxA1) to Nox1. It is co-localized with Nox1 in the membranes of resting cells and directs the subcellular localization of Nox1. NoxO1 contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), and a C-terminal proline-rich region (PRR). This model characterizes the second SH3 domain (or C-SH3) of NoxO1. The tandem SH3 domains of NoxO1 interact with the PRR of p22phox, which also complexes with Nox1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212957 Cd Length: 53 Bit Score: 50.80 E-value: 4.83e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1166 YTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd12024    8 YEAQKEDELSVPAGVVVEVLQKSDNGWWLIRYNGRAGYVPSMYLQP 53

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 50.88 E-value: 4.86e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVL-EQQDMWWFGEVQGQKGWFPKSYV 966
Cdd:cd11827    1 QCKALYAYDAQDTDELSFNEGDIIEILkEDPSGWWTGRLRGKEGLFPGNYV 51

Src homology 3 domain of Lck Protein Tyrosine Kinase; Lck is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lck is expressed in T-cells and natural killer cells. It plays a critical role in T-cell maturation, activation, and T-cell receptor (TCR) signaling. Lck phosphorylates ITAM (immunoreceptor tyr activation motif) sequences on several subunits of TCRs, leading to the activation of different second messenger cascades. Phosphorylated ITAMs serve as binding sites for other signaling factor such as Syk and ZAP-70, leading to their activation and propagation of downstream events. In addition, Lck regulates drug-induced apoptosis by interfering with the mitochondrial death pathway. The apototic role of Lck is independent of its primary function in T-cell signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212938 [Multi-domain] Cd Length: 54 Bit Score: 50.98 E-value: 5.07e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLnKEDPDWWKGE--VNGQVGLFPSNYV 1209
Cdd:cd12005    1 LVVALYSYEPSHDGDLGFEKGEKLRIL-EQSGEWWKAQslTTGQEGFIPFNFV 52

First Src Homology 3 domain of SH3 domain containing ring finger protein 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212860 Cd Length: 54 Bit Score: 51.10 E-value: 5.08e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1162 GMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11927    5 ALYNYEGKEPGDLKFSKGDIIILRRQVDENWYHGEVNGIHGFFPTNFVQI 54

C-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domains (SH3c) of the related proteins, GRB2 and GRAP2, have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212884 Cd Length: 53 Bit Score: 50.95 E-value: 5.17e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQD-MWWFGEVQGQKGWFPKSYV 966
Cdd:cd11951    2 VQAQYDFSAEDPSQLSFRRGDIIEVLDCPDpNWWRGRISGRVGFFPRNYV 51

N-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212881 [Multi-domain] Cd Length: 54 Bit Score: 50.97 E-value: 5.20e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQD--MWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11948    1 EAVALYSFQATESDELPFQKGDILKILNMEDdqNWYKAELQGREGYIPKNYIKV 54

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1; SKAP1, also called SKAP55 (Src kinase-associated protein of 55kDa), is an immune cell-specific adaptor protein that plays an important role in T-cell adhesion, migration, and integrin clustering. It is expressed exclusively in T-lymphocytes, mast cells, and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), Fyn, Riam, RapL, and RasGRP. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212977 Cd Length: 53 Bit Score: 51.01 E-value: 5.27e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1162 GMYDYTAQNDDELAFNKGQIINVLNKEDP--DWWKGEVNGQVGLFPSNYV 1209
Cdd:cd12044    4 GLWDCFGDNPDELSFQRGDLIYILSKEYNmyGWWVGELNGIVGIVPKDYL 53

Src homology 3 domain of Ysc84p and similar fungal proteins; This family is composed of the Saccharomyces cerevisiae proteins, Ysc84p (also called LAS17-binding protein 4, Lsb4p) and Lsb3p, and similar fungal proteins. They contain an N-terminal SYLF domain (also called DUF500) and a C-terminal SH3 domain. Ysc84p localizes to actin patches and plays an important in actin polymerization during endocytosis. The N-terminal domain of both Ysc84p and Lsb3p can bind and bundle actin filaments. A study of the yeast SH3 domain interactome predicts that the SH3 domains of Lsb3p and Lsb4p may function as molecular hubs for the assembly of endocytic complexes. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212776 [Multi-domain] Cd Length: 55 Bit Score: 50.89 E-value: 5.29e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQ---QDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11842    1 KAVALYDFAGEQPGDLAFQKGDIITILKKsdsQNDWWTGRIGGREGIFPANYVEL 55

First Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212852 [Multi-domain] Cd Length: 55 Bit Score: 50.73 E-value: 5.47e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11919    7 FDFKAQTLKELPLQKGDIVYIYKQIDQNWYEGEHHGRVGIFPRSYIEL 54

Src homology 3 domain of an unknown subfamily of proteins with similarity to Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212932 [Multi-domain] Cd Length: 56 Bit Score: 50.71 E-value: 5.50e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPD-WWKGEVN-GQVGLFPSNYV 1209
Cdd:cd11999    3 RVRAVYDYTGQEPDELSFKAGEELLKVEDEDEQgWCKGVTDgGAVGLYPANYV 55

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 50.78 E-value: 5.56e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNK--EDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11977    4 VARYNFAARDMRELSLREGDVVRIYSRigGDQGWWKGETNGRIGWFPSTYVE 55

Third Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212717 [Multi-domain] Cd Length: 55 Bit Score: 50.86 E-value: 5.72e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGE--VNGQVGLFPSNYVKL 1211
Cdd:cd11783    2 YVALYPYKPQKPDELELRKGEMYTVTEKCQDGWFKGTslRTGQSGVFPGNYVQP 55

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 50.59 E-value: 5.77e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGD-KAGVFPSNYV 1055
Cdd:cd11812    3 VALYDYTANRSDELTIHRGDIIRVLYKDNDnWWFGSLVNgQQGYFPANYV 52

Domain of unknown function (DUF4659); This family of proteins is found in eukaryotes. Proteins in this family are typically between 427 and 674 amino acids in length. There are two completely conserved residues (D and I) that may be functionally important.

Pssm-ID: 464768 [Multi-domain] Cd Length: 374 Bit Score: 56.97 E-value: 5.96e-08

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    337 DEQQQLEKKLPVTFEDKKRENF----ERGNLELEKRRQAL-LEQQRKEQERLAQLERAEQERKER-ERQEQERKRQLELE 410
Cdd:pfam15558   35 EELRRRDQKRQETLERERRLLLqqsqEQWQAEKEQRKARLgREERRRADRREKQVIEKESRWREQaEDQENQRQEKLERA 114

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    411 KQLEKQRelerqreeerrkeierreaaKRELERQ-RQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEF--ELEALND 487
Cdd:pfam15558  115 RQEAEQR--------------------KQCQEQRlKEKEEELQALREQNSLQLQERLEEACHKRQLKEREEqkKVQENNL 174

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    488 K---KHQLegKLQDIRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRDS 564
Cdd:pfam15558  175 SellNHQA--RKVLVDCQAKAEELLRRLSLEQSLQRSQENYEQLVEERHRELREKAQKEEEQFQRAKWRAEEKEEERQEH 252

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    565 lvtlKRAL-EAKELARQHLRDQLDEVEKETRSKLQEIdifnNQLKELREIHNKQQLQKQKSMEAERLKQ--KEQERKIIE 641
Cdd:pfam15558  253 ----KEALaELADRKIQQARQVAHKTVQDKAQRAREL----NLEREKNHHILKLKVEKEEKCHREGIKEaiKKKEQRSEQ 324

                          330
                   ....*....|...
gi 47717123    642 LEKQKEEAQRRAQ 654
Cdd:pfam15558  325 ISREKEATLEEAR 337

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 50.40 E-value: 6.09e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVL-EQQDMWWFGEVQGQKGWFPKSYV 966
Cdd:cd11826    4 ALYDYTADKDDELSFQEGDIIYVTkKNDDGWYEGVLNGVTGLFPGNYV 51

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 50.71 E-value: 6.29e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVKgewvdeSQTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11830    4 ARYDFCARDMRELSLKEGDVVKIY------NKKGQQGWWRGEINGRIGWFPSTYVEE 54

First Src homology 3 domain (or SH3A) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN2 is expected to bind many protein partners, similar to ITSN1 which has been shown to bind Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212921 [Multi-domain] Cd Length: 57 Bit Score: 50.64 E-value: 6.45e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQ---QDMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd11988    5 RALYPFEARNHDEMSFNAGDIIQVDEKtvgEPGWLYGSFQGNFGWFPCNYVE 56

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 50.54 E-value: 6.53e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKGEwvDESQTGEPGWLGGELKGKTGWFPANY 800
Cdd:cd12059    1 VWTAVFDYEASAEDELTLRRGDRVEVLSK--DSAVSGDEGWWTGKINDRVGIFPSNY 55

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 50.54 E-value: 6.71e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVK 967
Cdd:cd11820    2 KVRALYDFEAAEDNELTFKAGEIITVLDDSDPnWWKGSNHRGEGLFPANFVT 53

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 50.28 E-value: 6.88e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 47717123    746 RALYPFESRSHDEITIQPGDIVMVkgewVDESqtgEPGWLGGELK-GKTGWFPA 798
Cdd:pfam00018    1 VALYDYTAQEPDELSFKKGDIIIV----LEKS---EDGWWKGRNKgGKEGLIPS 47

Src Homology 3 domain of Apoptosis Stimulating of p53 protein 1; ASPP1, like ASPP2, activates the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73). In addition, it functions in the cytoplasm to regulate the nuclear localization of the transcriptional cofactors YAP and TAZ by inihibiting their phosphorylation; YAP and TAZ are important regulators of cell expansion, differentiation, migration, and invasion. ASPP1 is downregulated in breast tumors expressing wild-type p53. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of ASPP1 contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212887 [Multi-domain] Cd Length: 57 Bit Score: 50.40 E-value: 7.29e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKED---PDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11954    3 VYALWDYEAQNADELSFQEGDAITILRRKDdseTEWWWARLNDKEGYVPKNLLGL 57

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 50.49 E-value: 7.47e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1080 QVIA--SYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQArgkkrQIGWFPANYVKL 1135
Cdd:cd11840    1 QVIAlfPYTAQNEDELSFQKGDIINVLSKDDPDWWRGELNG-----QTGLFPSNYVEP 53

Src homology 3 domain of Signal Transducing Adaptor Molecule 1; STAM1 is part of the endosomal sorting complex required for transport (ESCRT-0) and is involved in sorting ubiquitinated cargo proteins from the endosome. It may also be involved in the regulation of IL2 and GM-CSF mediated signaling, and has been implicated in neural cell survival. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212897 [Multi-domain] Cd Length: 55 Bit Score: 50.33 E-value: 7.57e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQD-MWWFGEVQGQKGWFPKSYV 966
Cdd:cd11964    2 KVRAIYDFEAAEDNELTFKAGDIITILDDSDpNWWKGETPQGTGLFPSNFV 52

C-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also has roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRAP2 binds to different motifs found in substrate peptides including the typical PxxP motif in hematopoietic progenitor kinase 1 (HPK1), the RxxK motif in SLP-76 and HPK1, and the RxxxxK motif in phosphatase-like protein HD-PTP. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212883 [Multi-domain] Cd Length: 53 Bit Score: 50.21 E-value: 7.75e-08

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILV-TKKDGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd11950    4 ALYDFEALEDDELGFNSGDVIEVlDSSNPSWWKGRLHGKLGLFPANYVA 52

C2 domain first repeat present in Rabphilin and Double C2 domain; Rabphilin is found neurons and in neuroendrocrine cells, while Doc2 is found not only in the brain but in tissues, including mast cells, chromaffin cells, and osteoblasts. Rabphilin and Doc2s share highly homologous tandem C2 domains, although their N-terminal structures are completely different: rabphilin contains an N-terminal Rab-binding domain (RBD),7 whereas Doc2 contains an N-terminal Munc13-1-interacting domain (MID). C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176000 [Multi-domain] Cd Length: 123 Bit Score: 52.67 E-value: 7.89e-08

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1597 RLMVNVVEGIELKPCRSHGKSNPYCevtmgsQCHI-----------TKTIQDTLNPKWNSNCQFF-IR--DLEQEVLCIT 1662
Cdd:cd04035   16 ALHCTIIRAKGLKAMDANGLSDPYV------KLNLlpgaskatklrTKTVHKTRNPEFNETLTYYgITeeDIQRKTLRLL 89

                         90       100
                 ....*....|....*....|....*..
gi 47717123 1663 VFERDQFSpDDFLGRTEIRVADIKKDQ 1689
Cdd:cd04035   90 VLDEDRFG-NDFLGETRIPLKKLKPNQ 115

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 50.34 E-value: 7.96e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVmvkgewVDESQTgEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11873    2 VIVEFDYDAEEPDELTLKVGDII------TNVKKM-EEGWWEGTLNGKRGMFPDNFVKV 53

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 50.39 E-value: 8.08e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1005 EEFIAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11972    3 EKVVAIYDYTKDKEDELSFQEGAIIYVIKKNDDgWYEGVMNGVTGLFPGNYV 54

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 50.36 E-value: 8.55e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILV-TKKDGDWWTGTVGD-----KAGVFPSNY 1054
Cdd:cd11883    3 VALYDFTPKSKNQLSFKAGDIIYVlNKDPSGWWDGVIISssgkvKRGWFPSNY 55

Fifth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212752 [Multi-domain] Cd Length: 50 Bit Score: 50.17 E-value: 8.61e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  746 RALYPFESRSHDEITIQPGDIVmVKGEWVDESqtgepgWLGGELKGKTGWFPANY 800
Cdd:cd11818    3 RALYDFTGENEDELSFKAGDII-TELESIDEE------WMSGELRGKSGIFPKNF 50

Src homology 3 domain of Brk (Breast tumor kinase) Protein Tyrosine Kinase (PTK), also called PTK6; Brk is a cytoplasmic (or non-receptor) PTK with limited homology to Src kinases. It has been found to be overexpressed in a majority of breast tumors. It plays roles in normal cell differentiation, proliferation, survival, migration, and cell cycle progression. Brk substrates include RNA-binding proteins (SLM-1/2, Sam68), transcription factors (STAT3/5), and signaling molecules (Akt, paxillin, IRS-4). Src kinases in general contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr; they are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation site. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212781 [Multi-domain] Cd Length: 58 Bit Score: 50.25 E-value: 9.01e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTKKDGDWWTGTVGDKA------GVFPSNYV 1055
Cdd:cd11847    2 YKALWDFKARGDEELSFQAGDQFRIAERSGDWWTALKLDRAggvvaqGFVPNNYL 56

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 50.11 E-value: 9.17e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  747 ALYPFESRSHDEITIQPGDIVmVKGEWVDEsqtgepGWLGGELKGKTGWFPANYAE 802
Cdd:cd11959    4 ALYDYQAADDDEISFDPDDII-TNIEMIDE------GWWRGVCRGKYGLFPANYVE 52

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213017 [Multi-domain] Cd Length: 57 Bit Score: 50.19 E-value: 9.80e-08

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDM-----WWFGEVQGQKGWFPKSYVK 967
Cdd:cd12141    4 AVYTFKARSPNELSVSANQRVRILEFSDLtgnkeWWLAEANGQKGYVPSNYIR 56

C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 2 (Stac2); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac2 contains a single SH3 domain at the C-terminus unlike Stac1 and Stac3, which contain two C-terminal SH3 domains. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212918 Cd Length: 53 Bit Score: 49.95 E-value: 1.02e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11985    3 VALYKFLPQENNDLPLQPGDRVMVVDDSNEDWWKGKSGDRVGFFPANFVQ 52

Centrosomal protein of 63 kDa; CEP63 is a family of eukaryotic proteins involved in centriole activity.

Pssm-ID: 465338 [Multi-domain] Cd Length: 264 Bit Score: 55.21 E-value: 1.09e-07

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    336 EDEQQQLEKKLPVTFEDKKREnFERGNLELEKR----------RQALLEQQRKEQERL-AQLERAEQERKE--RERQEQE 402
Cdd:pfam17045    5 EAELQELMKQIDIMVAHKKSE-WEGQTRALETRldireeellsARNTLERKHKEIGLLrQQLEELEKGKQElvAKYEQQL 83

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    403 RKRQLEL-------EKQLEKQRELERQREEERRKEIERREAAKRELE--RQRQLEWERnrrqellnQRNKEQEDIVVLKA 473
Cdd:pfam17045   84 QKLQEELsklkrsyEKLQRKQLKEAREEAKSREEDRSELSRLNGKLEefRQKSLEWEQ--------QRLQYQQQVASLEA 155

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    474 KKKTLEFELE---------ALNDKKHQLEGKLQDIRcRLTTQRQEIESTNKSRELriaEITHLQQQLQESQQMLGRLIPE 544
Cdd:pfam17045  156 QRKALAEQSSliqsaayqvQLEGRKQCLEASQSEIQ-RLRSKLERAQDSLCAQEL---ELERLRMRVSELGDSNRKLLEE 231

                          250       260       270
                   ....*....|....*....|....*....|...
gi 47717123    545 KQILNDQLKQVQ-QNSLHRDSLVTLKRALEAKE 576
Cdd:pfam17045  232 QQRLLEELRMSQrQLQVLQNELMELKATLQSQD 264

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 50.07 E-value: 1.10e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1012 TYESSEqgdLTFQQGDVILVTK-KDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11828   10 TMDPEE---LGFKAGDVIEVLDmSDKDWWWGSIRDEEGWFPASFVRL 53

Src Homology 3 (SH3) domain of Apoptosis Stimulating of p53 protein 2; ASPP2 is the full length form of the previously-identified tumor supressor, p53-binding protein 2 (p53BP2). ASPP2 activates the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73). It plays a central role in regulating apoptosis and cell growth; ASPP2-deficient mice show postnatal death. Downregulated expression of ASPP2 is frequently found in breast tumors, lung cancer, and diffuse large B-cell lymphoma where it is correlated with a poor clinical outcome. ASPP2 contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of ASPP2 contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212886 [Multi-domain] Cd Length: 57 Bit Score: 49.95 E-value: 1.11e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPD---WWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11953    3 VYALWDYEGESDDELSFKEGDCMTILRREDEDeteWWWARLNDKEGYVPRNLLGL 57

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 56.99 E-value: 1.13e-07

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    336 EDEQQQLEKKLPVTFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQL--ERAEQERkERERQEQERKRQLELEKQL 413
Cdd:TIGR02168  723 ELSRQISALRKDLARLEAEVEQLEERIAQLSKELTELEAEIEELEERLEEAeeELAEAEA-EIEELEAQIEQLKEELKAL 801

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    414 EKQrelerqreeerrkeierREAAKRELERQRQ-LEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNdkkHQL 492
Cdd:TIGR02168  802 REA-----------------LDELRAELTLLNEeAANLRERLESLERRIAATERRLEDLEEQIEELSEDIESLA---AEI 861

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    493 EgklqdircRLTTQRQEIEStnksrelriaEITHlqqqlqesqqmlgrlipekqILNDQLKQVQQNSLHRDSLVTLKRAL 572
Cdd:TIGR02168  862 E--------ELEELIEELES----------ELEA--------------------LLNERASLEEALALLRSELEELSEEL 903

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    573 EAKELARQHLRDQLDEV-EKETRSKLQEIDIfnnqlkELREIHNKQQLQKQKSMEAERLKQK---------EQERKIIEL 642
Cdd:TIGR02168  904 RELESKRSELRRELEELrEKLAQLELRLEGL------EVRIDNLQERLSEEYSLTLEEAEALenkieddeeEARRRLKRL 977


                   ....*.
gi 47717123    643 EKQKEE 648
Cdd:TIGR02168  978 ENKIKE 983

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 50.02 E-value: 1.14e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1084 SYTATGPEQLTLAPGQLILIRKKNPGGWWEGELqarGKKRQiGWFPANYVK 1134
Cdd:cd11825    7 DYRAQRPDELSFCKHAIITNVEKEDGGWWRGDY---GGKKQ-KWFPANYVE 53

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 49.82 E-value: 1.16e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|...
gi 47717123 1091 EQLTLAPGQLILIRKKNPGGWWEGElqargKKRQIGWFPANYV 1133
Cdd:cd11829   15 QGLSFEAGELIRVLQAPDGGWWEGE-----KDGLRGWFPASYV 52

Src homology 3 domain of Rho GTPase-activating proteins 32 and 33, and similar proteins; Members of this family contain N-terminal PX and Src Homology 3 (SH3) domains, a central Rho GAP domain, and C-terminal extensions. RhoGAPs (or ARHGAPs) bind to Rho proteins and enhance the hydrolysis rates of bound GTP. ARHGAP32 is also called RICS, PX-RICS, p250GAP, or p200RhoGAP. It is a Rho GTPase-activating protein for Cdc42 and Rac1, and is implicated in the regulation of postsynaptic signaling and neurite outgrowth. PX-RICS, a variant of RICS that contain PX and SH3 domains, is the main isoform expressed during neural development. It is involved in neural functions including axon and dendrite extension, postnatal remodeling, and fine-tuning of neural circuits during early brain development. ARHGAP33, also called sorting nexin 26 or TCGAP (Tc10/CDC42 GTPase-activating protein), is widely expressed in the brain where it is involved in regulating the outgrowth of axons and dendrites and is regulated by the protein tyrosine kinase Fyn. It is translocated to the plasma membrane in adipocytes in response to insulin and may be involved in the regulation of insulin-stimulated glucose transport. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212769 [Multi-domain] Cd Length: 54 Bit Score: 49.76 E-value: 1.16e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1166 YTAQNDDELAFNKGQIINVLN---KEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11835    8 YTAQAPDELSLEVGDIVSVIDmppPEESTWWRGKKGFQVGFFPSECV 54

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 49.83 E-value: 1.17e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 968
Cdd:cd12073    3 AVALYDYQGEGDDEISFDPQETITDIEMVDEgWWKGTCHGHRGLFPANYVEL 54

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 50.07 E-value: 1.18e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVK 967
Cdd:cd12061    3 RAKFNFQQTNEDELSFSKGDVIHVTRVEEGgWWEGTHNGRTGWFPSNYVR 52

C-terminal Src Homology 3 domain of Nebulette and LIM-nebulette (or Lasp2); Nebulette is a cardiac-specific protein that localizes to the Z-disc. It interacts with tropomyosin and is important in stabilizing actin thin filaments in cardiac muscles. Polymorphisms in the nebulette gene are associated with dilated cardiomyopathy, with some mutations resulting in severe heart failure. Nebulette is a 107kD protein that contains an N-terminal acidic region, multiple nebulin repeats, and a C-terminal SH3 domain. LIM-nebulette, also called Lasp2 (LIM and SH3 domain protein 2), is an alternatively spliced variant of nebulette. Although it shares a gene with nebulette, Lasp2 is not transcribed from a muscle-specific promoter, giving rise to its multiple tissue expression pattern with highest amounts in the brain. It can crosslink actin filaments and it affects cell spreading. Lasp2 is a 34kD protein containing an N-terminal LIM domain, three nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212868 [Multi-domain] Cd Length: 58 Bit Score: 50.00 E-value: 1.22e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEV--NGQVGLFPSNYVKL 1211
Cdd:cd11935    6 MYDYSAQDEDEVSFRDGDYIVNVQPIDEGWMYGTVqrTGRTGMLPANYIEF 56

C2 domain first repeat present in Tricalbin-like proteins; 5 to 6 copies of the C2 domain are present in Tricalbin, a yeast homolog of Synaptotagmin, which is involved in membrane trafficking and sorting. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-II topology.

Pssm-ID: 176009 [Multi-domain] Cd Length: 124 Bit Score: 52.17 E-value: 1.24e-07

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1595 IGRLMVNVVEGIELKPCRSHGKS-NPYCEVTMGSQCHI--TKTIQDTLNPKWNSNcQFFIRDLEQEVLCITVFERDQFSP 1671
Cdd:cd04044    1 IGVLAVTIKSARGLKGSDIIGGTvDPYVTFSISNRRELarTKVKKDTSNPVWNET-KYILVNSLTEPLNLTVYDFNDKRK 79

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1672 DDFLGRTEIRVADIkKDQGSKGPVTKCLLLHEVPTGEIvvRLDLQLF 1718
Cdd:cd04044   80 DKLIGTAEFDLSSL-LQNPEQENLTKNLLRNGKPVGEL--NYDLRFF 123

Third Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212718 Cd Length: 55 Bit Score: 49.78 E-value: 1.29e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGE--VNGQVGLFPSNYV 1209
Cdd:cd11784    3 VALHSYSAHRPEELELQKGEGVRVLGKFQEGWLRGLslVTGRVGIFPSNYV 53

Second Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the second C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212712 [Multi-domain] Cd Length: 51 Bit Score: 49.42 E-value: 1.34e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVkgewvdesQTGEP--GWLGGELKGKTGWFPANY 800
Cdd:cd11778    1 YVEALYDYEAQGDDEISIRVGDRIAV--------IRGDDgsGWTYGEINGVKGLFPTSY 51

C-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also has roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRAP2 binds to different motifs found in substrate peptides including the typical PxxP motif in hematopoietic progenitor kinase 1 (HPK1), the RxxK motif in SLP-76 and HPK1, and the RxxxxK motif in phosphatase-like protein HD-PTP. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212883 [Multi-domain] Cd Length: 53 Bit Score: 49.82 E-value: 1.37e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQD-MWWFGEVQGQKGWFPKSYVK 967
Cdd:cd11950    1 QVRALYDFEALEDDELGFNSGDVIEVLDSSNpSWWKGRLHGKLGLFPANYVA 52

First Src homology 3 domain (or SH3A) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN2 is expected to bind many protein partners, similar to ITSN1 which has been shown to bind Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212921 [Multi-domain] Cd Length: 57 Bit Score: 49.87 E-value: 1.37e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKE--DPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11988    7 LYPFEARNHDEMSFNAGDIIQVDEKTvgEPGWLYGSFQGNFGWFPCNYVE 56

exonuclease SbcC; All proteins in this family for which functions are known are part of an exonuclease complex with sbcD homologs. This complex is involved in the initiation of recombination to regulate the levels of palindromic sequences in DNA. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

Pssm-ID: 129705 [Multi-domain] Cd Length: 1042 Bit Score: 56.52 E-value: 1.47e-07

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    370 QALLEQQRKEQERLAQLERAEQ------ERKERERQEQERKRQLELEKQLEKQ--RELERQREEERRKEIERREAAKREL 441
Cdd:TIGR00618  156 QFLKAKSKEKKELLMNLFPLDQytqlalMEFAKKKSLHGKAELLTLRSQLLTLctPCMPDTYHERKQVLEKELKHLREAL 235

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    442 ERQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLE-----GKLQDIRCRLTTQRQEIESTNKS 516
Cdd:TIGR00618  236 QQTQQSHAYLTQKREAQEEQLKKQQLLKQLRARIEELRAQEAVLEETQERINrarkaAPLAAHIKAVTQIEQQAQRIHTE 315

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    517 RELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRDSLVTLKRALEAKELARQHLR---DQLDEVEKET 593
Cdd:TIGR00618  316 LQSKMRSRAKLLMKRAAHVKQQSSIEEQRRLLQTLHSQEIHIRDAHEVATSIREISCQQHTLTQHIHtlqQQKTTLTQKL 395

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    594 RSKLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQER---------KIIELEKQKEEAQRRAQERDKQWLEHV 664
Cdd:TIGR00618  396 QSLCKELDILQREQATIDTRTSAFRDLQGQLAHAKKQQELQQRYaelcaaaitCTAQCEKLEKIHLQESAQSLKEREQQL 475

                          330       340
                   ....*....|....*....|...
gi 47717123    665 QQ-EDEHQRPRKLHEEEKLKREE 686
Cdd:TIGR00618  476 QTkEQIHLQETRKKAVVLARLLE 498

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Embryonal Fyn-associated Substrate; EFS is also called HEFS, CASS3 (Cas scaffolding protein family member 3) or SIN (Src-interacting protein). It was identified based on interactions with the Src kinases, Fyn and Yes. It plays a role in thymocyte development and acts as a negative regulator of T cell proliferation. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212936 Cd Length: 62 Bit Score: 49.89 E-value: 1.66e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPD---WWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd12003    6 LYDNAAESPEELSFRRGDVLMVLKREHGSlpgWWLCSLHGQQGIAPANRLRL 57

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 49.25 E-value: 1.68e-07

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKgewvdeSQTGEPGWLGGE-LKGKTGWFPANYAE 802
Cdd:cd11763    1 KVRALYDFDSQPSGELSLRAGEVLTIT------RQDVGDGWLEGRnSRGEVGLFPSSYVE 54

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 49.25 E-value: 1.68e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11874    4 VLFSYTPQNEDELELKVGDTIEVLGEVEEgWWEGKLNGKVGVFPSNFVKE 53

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 49.62 E-value: 1.73e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1084 SYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGkkrqiGWFPANYVK 1134
Cdd:cd12060    9 NFKQTNEDELSVCKGDIIYVTRVEEGGWWEGTLNGKT-----GWFPSNYVR 54

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 49.30 E-value: 1.74e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1084 SYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARgkkrqIGWFPANYVK 1134
Cdd:cd12061    7 NFQQTNEDELSFSKGDVIHVTRVEEGGWWEGTHNGR-----TGWFPSNYVR 52

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 49.39 E-value: 1.75e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQ---DMWWFGEVQGQKGWFPKSYV 966
Cdd:cd12142    3 RVLFDYNPVAPDELALKKGDVIEVISKEtedEGWWEGELNGRRGFFPDNFV 53

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 2; ASAP2 is also called DDEF2 (Development and Differentiation Enhancing Factor 2), AMAP2, centaurin beta-3, or PAG3. It mediates the functions of Arf GTPases vial dual mechanisms: it exhibits GTPase activating protein (GAP) activity towards class I (Arf1) and II (Arf5) Arfs; and it binds class III Arfs (GTP-Arf6) stably without GAP activity. It binds paxillin and is implicated in Fcgamma receptor-mediated phagocytosis in macrophages and in cell migration. ASAP2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212899 Cd Length: 56 Bit Score: 49.57 E-value: 1.79e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQV---GLFPSNYV 1209
Cdd:cd11966    1 RVKALYNCVADNPDELTFSEGEIIIVDGEEDKEWWIGHIDGEPtrrGAFPVSFV 54

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 49.26 E-value: 1.84e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGE--LKGKTGWFPANYAE 802
Cdd:cd11793    4 CVHAYTAQQPDELTLEEGDVVNV-------LRKMPDGWYEGErlRDGERGWFPSSYTE 54

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 48.74 E-value: 2.04e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 47717123   1080 QVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELqargKKRQIGWFPA 1130
Cdd:pfam00018    1 VALYDYTAQEPDELSFKKGDIIIVLEKSEDGWWKGRN----KGGKEGLIPS 47

Second Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the second C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212712 [Multi-domain] Cd Length: 51 Bit Score: 49.03 E-value: 2.11e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQDM--WWFGEVQGQKGWFPKSY 965
Cdd:cd11778    3 EALYDYEAQGDDEISIRVGDRIAVIRGDDGsgWTYGEINGVKGLFPTSY 51

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 49.25 E-value: 2.19e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTVGDKA-GVFPSNYV 1055
Cdd:cd11825    4 ALYDYRAQRPDELSFCKHAIITnVEKEDGGWWRGDYGGKKqKWFPANYV 52

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 49.26 E-value: 2.19e-07

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|...
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKgewvdesQTGEPGWLGGELKGK-----TGWFPANYAEK 803
Cdd:cd11839    3 QVIAPFTATAENQLSLAVGQLVLVR-------KKSPSGWWEGELQARgkkrqIGWFPANYVKL 58

Src homology 3 domain of Src Protein Tyrosine Kinase; Src (or c-Src) is a cytoplasmic (or non-receptor) PTK and is the vertebrate homolog of the oncogenic protein (v-Src) from Rous sarcoma virus. Together with other Src subfamily proteins, it is involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. Src also play a role in regulating cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Elevated levels of Src kinase activity have been reported in a variety of human cancers. Several inhibitors of Src have been developed as anti-cancer drugs. Src is also implicated in acute inflammatory responses and osteoclast function. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212941 [Multi-domain] Cd Length: 56 Bit Score: 49.34 E-value: 2.25e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGE--VNGQVGLFPSNYV 1209
Cdd:cd12008    3 VALYDYESRTETDLSFKKGERLQIVNNTEGDWWLAHslTTGQTGYIPSNYV 53

Src Homology 3 domain of Bruton's tyrosine kinase; BTK is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain with proline-rich and zinc-binding regions. Btk is expressed in B-cells, and a variety of myeloid cells including mast cells, platelets, neutrophils, and dendrictic cells. It interacts with a variety of partners, from cytosolic proteins to nuclear transcription factors, suggesting a diversity of functions. Stimulation of a diverse array of cell surface receptors, including antigen engagement of the B-cell receptor (BCR), leads to PH-mediated membrane translocation of Btk and subsequent phosphorylation by Src kinase and activation. Btk plays an important role in the life cycle of B-cells including their development, differentiation, proliferation, survival, and apoptosis. Mutations in Btk cause the primary immunodeficiency disease, X-linked agammaglobulinaemia (XLA) in humans. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212839 [Multi-domain] Cd Length: 55 Bit Score: 49.05 E-value: 2.28e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKG-EVNGQVGLFPSNYV 1209
Cdd:cd11906    3 VVALYDYTPMNAQDLQLRKGEEYVILEESNLPWWRArDKNGREGYIPSNYV 53

Second C-terminal Src homology 3 domain of Rho guanine nucleotide exchange factor 37; ARHGEF37 contains a RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. Its specific function is unknown. Its domain architecture is similar to the C-terminal half of DNMBP or Tuba, a cdc42-specific GEF that provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics, and plays an important role in regulating cell junction configuration. GEFs activate small GTPases by exchanging bound GDP for free GTP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212874 Cd Length: 57 Bit Score: 49.14 E-value: 2.31e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKED----PDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11941    1 QVVAAYPFTARSKHEVSLQAGQPVTVLEPHDkkgsPEWSLVEVNGQRGYVPSSYL 55

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor 2; ASEF2, also called Spermatogenesis-associated protein 13 (SPATA13), is a GEF that localizes with actin at the leading edge of cells and is important in cell migration and adhesion dynamics. GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF2 can activate both Rac 1 and Cdc42, but only Rac1 activation is necessary for increased cell migration and adhesion turnover. Together with APC (adenomatous polyposis coli) and Neurabin2, a scaffold protein that binds F-actin, it is involved in regulating HGF-induced cell migration. ASEF2 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212907 Cd Length: 54 Bit Score: 48.91 E-value: 2.32e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11974    3 AEALWDHVTMDDQELAFKAGDVIRVLEASNKdWWWGRNEDREAWFPASFVRL 54

C2 domain found in Rab11-family interacting proteins (FIP) class I; Rab GTPases recruit various effector proteins to organelles and vesicles. Rab11-family interacting proteins (FIPs) are involved in mediating the role of Rab11. FIPs can be divided into three classes: class I FIPs (Rip11a, Rip11b, RCP, and FIP2) which contain a C2 domain after N-terminus of the protein, class II FIPs (FIP3 and FIP4) which contain two EF-hands and a proline rich region, and class III FIPs (FIP1) which exhibits no homology to known protein domains. All FIP proteins contain a highly conserved, 20-amino acid motif at the C-terminus of the protein, known as Rab11/25 binding domain (RBD). Class I FIPs are thought to bind to endocytic membranes via their C2 domain, which interacts directly with phospholipids. Class II FIPs do not have any membrane binding domains leaving much to speculate about the mechanism involving FIP3 and FIP4 interactions with endocytic membranes. The members in this CD are class I FIPs. The exact function of the Rab11 and FIP interaction is unknown, but there is speculation that it involves the role of forming a targeting complex that recruits a group of proteins involved in membrane transport to organelles. The C2 domain was first identified in PKC. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176064 [Multi-domain] Cd Length: 126 Bit Score: 51.30 E-value: 2.36e-07

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1600 VNVVEGIELKPCRSHGKSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDL-----EQEVLCITVFERDQFSPDDF 1674
Cdd:cd08682    3 VTVLQARGLLCKGKSGTNDAYVIIQLGKEKYSTSVKEKTTSPVWKEECSFELPGLlsgngNRATLQLTVMHRNLLGLDKF 82

                         90
                 ....*....|....*...
gi 47717123 1675 LGRTEIRVADIKKDQGSK 1692
Cdd:cd08682   83 LGQVSIPLNDLDEDKGRR 100

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 49.05 E-value: 2.50e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVKGEwvDESQTGEPGWLGGELKGKTGWFPANY 800
Cdd:cd11876    4 ALFDYDARGEDELTLRRGQPVEVLSK--DAAVSGDEGWWTGKIGDKVGIFPSNY 55

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 2; SKAP2, also called SKAP55-Related (SKAP55R) or SKAP55 homolog (SKAP-HOM or SKAP55-HOM), is an immune cell-specific adaptor protein that plays an important role in adhesion and migration of B-cells and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), YopH, SHPS1, and HPK1. SKAP2 has also been identified as a substrate for lymphoid-specific tyrosine phosphatase (Lyp), which has been implicated in a wide variety of autoimmune diseases. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. Like SKAP1, SKAP2 is expected to bind primarily to a proline-rich region of ADAP through its SH3 domain; its degradation may be regulated by ADAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212978 Cd Length: 53 Bit Score: 48.74 E-value: 2.55e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1162 GMYDYTAQNDDELAFNKGQIINVLNKEDP--DWWKGEVNGQVGLFPSNYV 1209
Cdd:cd12045    4 GLWDCTGDQPDELSFKRGDTIYILSKEYNrfGWWVGEMKGTIGLVPKAYI 53

C2 domain first repeat in Munc13 (mammalian uncoordinated)-like proteins; C2-like domains are thought to be involved in phospholipid binding in a Ca2+ independent manner in both Unc13 and Munc13. Caenorabditis elegans Unc13 has a central domain with sequence similarity to PKC, which includes C1 and C2-related domains. Unc13 binds phorbol esters and DAG with high affinity in a phospholipid manner. Mutations in Unc13 results in abnormal neuronal connections and impairment in cholinergic neurotransmission in the nematode. Munc13 is the mammalian homolog which are expressed in the brain. There are 3 isoforms (Munc13-1, -2, -3) and are thought to play a role in neurotransmitter release and are hypothesized to be high-affinity receptors for phorbol esters. Unc13 and Munc13 contain both C1 and C2 domains. There are two C2 related domains present, one central and one at the carboxyl end. Munc13-1 contains a third C2-like domain. Munc13 interacts with syntaxin, synaptobrevin, and synaptotagmin suggesting a role for these as scaffolding proteins. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 176058 [Multi-domain] Cd Length: 153 Bit Score: 51.99 E-value: 2.59e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1630 HITKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDqfspDDFLGRTEIRVADIKKD 1688
Cdd:cd08676   91 KVTEVKPQTLNPVWNETFRFEVEDVSNDQLHLDIWDHD----DDFLGCVNIPLKDLPSC 145

C2 domain second repeat present in Tricalbin-like proteins; 5 to 6 copies of the C2 domain are present in Tricalbin, a yeast homolog of Synaptotagmin, which is involved in membrane trafficking and sorting. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 176017 [Multi-domain] Cd Length: 111 Bit Score: 50.68 E-value: 2.62e-07

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1615 GKSNPYCEVTMGSQ-CHITKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFErDQFSPDDFLGRTEIRVADI 1685
Cdd:cd04052   11 GLLSPYAELYLNGKlVYTTRVKKKTNNPSWNASTEFLVTDRRKSRVTVVVKD-DRDRHDPVLGSVSISLNDL 81

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 49.22 E-value: 2.67e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQD-MWWFGEVQGQKG-WFPKSYVKLIS 970
Cdd:cd11970    7 KALFDYKAQREDELTFTKNAIIQNVEKQEgGWWRGDYGGKKQlWFPSNYVEEIS 60

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 48.67 E-value: 2.77e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd12073    4 VALYDYQGEGDDEISFDPQETITdIEMVDEGWWKGTCHGHRGLFPANYVEL 54

Mitotic checkpoint protein; This family consists of several eukaryotic mitotic checkpoint (Mitotic arrest deficient or MAD) proteins. The mitotic spindle checkpoint monitors proper attachment of the bipolar spindle to the kinetochores of aligned sister chromatids and causes a cell cycle arrest in prometaphase when failures occur. Multiple components of the mitotic spindle checkpoint have been identified in yeast and higher eukaryotes. In S.cerevisiae, the existence of a Mad1-dependent complex containing Mad2, Mad3, Bub3 and Cdc20 has been demonstrated.

Pssm-ID: 461677 [Multi-domain] Cd Length: 660 Bit Score: 55.52 E-value: 2.81e-07

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    338 EQQQLEKKLPVTFEDKKRENFE--RGNLELEKRRQALLEQQRKE-------QERLAQLERAEQERKERERQEQERKRQL- 407
Cdd:pfam05557    3 ELIESKARLSQLQNEKKQMELEhkRARIELEKKASALKRQLDREsdrnqelQKRIRLLEKREAEAEEALREQAELNRLKk 82

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    408 ----ELEKQLEKQRELERQREEERRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKEQedivvlKAKKKTLEFELE 483
Cdd:pfam05557   83 kyleALNKKLNEKESQLADAREVISCLKNELSELRRQIQRAELELQSTNSELEELQERLDLL------KAKASEAEQLRQ 156

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    484 ALNDKKHQL---EGKLQDIRCRLTTQRQ--EIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQL----KQ 554
Cdd:pfam05557  157 NLEKQQSSLaeaEQRIKELEFEIQSQEQdsEIVKNSKSELARIPELEKELERLREHNKHLNENIENKLLLKEEVedlkRK 236

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    555 VQQNSLHRDSLVTLKRALEA--------KELARQH---------LRDQLDEVEKETRSKLQEIDIFNNQLKELReihnKQ 617
Cdd:pfam05557  237 LEREEKYREEAATLELEKEKleqelqswVKLAQDTglnlrspedLSRRIEQLQQREIVLKEENSSLTSSARQLE----KA 312

                          330       340       350       360       370
                   ....*....|....*....|....*....|....*....|....*....|.
gi 47717123    618 QLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRR----AQERD--KQWLE 662
Cdd:pfam05557  313 RRELEQELAQYLKKIEDLNKKLKRHKALVRRLQRRvlllTKERDgyRAILE 363

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 48.79 E-value: 2.88e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11856    2 YVAIADYEAQGDDEISLQEGEVVEV-------LEKNDSGWWYVRKGDKEGWVPASYLEP 53

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 48.89 E-value: 2.97e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVL--EQQDM-WWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11875    1 KARVLFDYEAENEDELTLREGDIVTILskDCEDKgWWKGELNGKRGVFPDNFVEP 55

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 48.87 E-value: 2.99e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVKgewvdeSQTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11978    5 ARYDFCARDMRELSLLKGDVVKIY------TKMSTNGWWRGEVNGRVGWFPSTYVEE 55

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 48.52 E-value: 3.01e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11824    2 YSVLYDYTAQEDDELSISKGDVVAVIEKgEDGWWTVERNGQKGLVPGTYLEK 53

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 48.49 E-value: 3.05e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwVDESqtgepgWLGGELKGKTGWFPANYAE 802
Cdd:cd11781    3 RALYPFKAQSAKELSLKKGDIIYIRRQ-IDKN------WYEGEHNGRVGIFPASYVE 52

Fifth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212752 [Multi-domain] Cd Length: 50 Bit Score: 48.63 E-value: 3.36e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQKGWFPKSY 965
Cdd:cd11818    1 KARALYDFTGENEDELSFKAGDIITELESIDEEWMsGELRGKSGIFPKNF 50

C2 domain found in fungal Ingression 1 (Inn1) proteins; Saccharomyces cerevisiae Inn1 associates with the contractile actomyosin ring at the end of mitosis and is needed for cytokinesis. The C2 domain of Inn1, located at the N-terminus, is required for ingression of the plasma membrane. The C-terminus is relatively unstructured and contains eight PXXP motifs that are thought to mediate interaction of Inn1 with other proteins with SH3 domains in the cytokinesis proteins Hof1 (an F-BAR protein) and Cyk3 (whose overexpression can restore primary septum formation in Inn1Delta cells) as well as recruiting Inn1 to the bud-neck by binding to Cyk3. Inn1 and Cyk3 appear to cooperate in activating chitin synthase Chs2 for primary septum formation, which allows coordination of actomyosin ring contraction with ingression of the cleavage furrow. It is thought that the C2 domain of Inn1 helps to preserve the link between the actomyosin ring and the plasma membrane, contributing both to membrane ingression, as well as to stability of the contracting ring. Additionally, Inn1 might induce curvature of the plasma membrane adjacent to the contracting ring, thereby promoting ingression of the membrane. It has been shown that the C2 domain of human synaptotagmin induces curvature in target membranes and thereby contributes to fusion of these membranes with synaptic vesicles. The C2 domain was first identified in PKC. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176063 [Multi-domain] Cd Length: 118 Bit Score: 50.71 E-value: 3.45e-07

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTMGSQCHITKTI----QdtlNPKWNSNCQFFIRDLEQEVLCITVFErDQFSP 1671
Cdd:cd08681    1 GTLVVVVLKARNLPNKRKLDKQDPYCVLRIGGVTKKTKTDfrggQ---HPEWDEELRFEITEDKKPILKVAVFD-DDKRK 76

                         90
                 ....*....|....*.
gi 47717123 1672 DDFLGRTEIrvaDIKK 1687
Cdd:cd08681   77 PDLIGDTEV---DLSP 89

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 48.55 E-value: 3.54e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTVGD-KAGVFPSNYVRL 1057
Cdd:cd11960    4 ALYDYQAADDTEISFDPGDIITdIEQIDEGWWRGTGPDgTYGLFPANYVEL 54

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 48.38 E-value: 3.64e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQD-MWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11928    4 KALYSYEGKEPGDLKFNKGDIIILRRKVDeNWYHGELNGCHGFLPASYIQC 54

Third Src homology 3 domain (or SH3C) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. The SH3C of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212772 [Multi-domain] Cd Length: 52 Bit Score: 48.18 E-value: 3.97e-07

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKgewvdeSQTGEpgWLGGELKGKTGWFPANYAEK 803
Cdd:cd11838    1 EYIALYPYESNEPGDLTFNAGDVILVT------KKDGE--WWTGTIGDRTGIFPSNYVRP 52

Uncharacterized protein, contains DUF3084 domain [Function unknown];

Pssm-ID: 443500 [Multi-domain] Cd Length: 370 Bit Score: 54.14 E-value: 4.17e-07

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  453 RRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQ 532
Cdd:COG4372   11 ARLSLFGLRPKTGILIAALSEQLRKALFELDKLQEELEQLREELEQAREELEQLEEELEQARSELEQLEEELEELNEQLQ 90

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  533 ESQQMLGRLIPEKQILNDQLKQVQQnslhrdSLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELRE 612
Cdd:COG4372   91 AAQAELAQAQEELESLQEEAEELQE------ELEELQKERQDLEQQRKQLEAQIAELQSEIAEREEELKELEEQLESLQE 164

                        170       180       190       200       210       220
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  613 IHNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEE 680
Cdd:COG4372  165 ELAALEQELQALSEAEAEQALDELLKEANRNAEKEEELAEAEKLIESLPRELAEELLEAKDSLEAKLG 232

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 48.16 E-value: 4.23e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQ-GQKGWFPKSYVKL 968
Cdd:cd11960    2 ARALYDYQAADDTEISFDPGDIITDIEQIDEgWWRGTGPdGTYGLFPANYVEL 54

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 48.08 E-value: 4.27e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGElqarGKKRQIGWFPANYVKL 1135
Cdd:cd11819    2 AKALYDYQAAEDNEISFVEGDIITQIEQIDEGWWLGV----NAKGQKGLFPANYVEL 54

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 48.40 E-value: 4.28e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQ--QDMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd11976    2 AKARYDFCARDRSELSLKEGDIIKILNKkgQQGWWRGEIYGRVGWFPANYVE 53

First Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212862 Cd Length: 54 Bit Score: 48.40 E-value: 4.55e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11929    2 RAKALCNYRGHNPGDLKFNKGDVILLRRQLDEnWYLGEINGVSGIFPASSVEV 54

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 48.03 E-value: 4.61e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11766    1 PAVVKFNYEAQREDELSLRKGDRVLVLEKSSDgWWRGECNGQVGWFPSNYV 51

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 48.01 E-value: 4.73e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKgEWVDesqtgePGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11805    3 QALYDFNPQEPGELEFRRGDIITVL-DSSD------PDWWKGELRGRVGIFPANYVQP 53

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. Also included in this subfamily is the second C-terminal SH3 domain of Rho guanine nucleotide exchange factor 37 (ARHGEF37), whose function is still unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212734 [Multi-domain] Cd Length: 57 Bit Score: 48.14 E-value: 4.84e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDM-----WWFGEVQGQKGWFPKSY 965
Cdd:cd11800    4 ALYTFEARSPGELSVTEGQVVTVLEKHDLkgnpeWWLVEDRGKQGYVPSNY 54

Second Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the second SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212721 [Multi-domain] Cd Length: 53 Bit Score: 48.10 E-value: 4.85e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1008 IAMYTYESS---EQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNY 1054
Cdd:cd11787    3 KALYDFEMKdedEKDCLTFKKGDVITVIRRvDENWAEGRLGDKIGIFPISF 53

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 48.08 E-value: 5.01e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQD-MWWFGEVQGQ---KGWFPKSY 965
Cdd:cd11821    2 VRALYDCQADNDDELTFSEGEIIVVTGEEDdEWWEGHIEGDpsrRGVFPVSF 53

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213017 [Multi-domain] Cd Length: 57 Bit Score: 48.26 E-value: 5.14e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKED----PDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12141    5 VYTFKARSPNELSVSANQRVRILEFSDltgnKEWWLAEANGQKGYVPSNYIR 56

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 55.06 E-value: 5.20e-07

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    334 VLEDEQQQLEKKLPVtfEDKKRENFERGNLELEKRRQAL----------LEQQRKEQERL-AQLERAEqERKERERQEQE 402
Cdd:TIGR02168  348 ELKEELESLEAELEE--LEAELEELESRLEELEEQLETLrskvaqlelqIASLNNEIERLeARLERLE-DRRERLQQEIE 424

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    403 RKRQLELEKQLEKQRELERQREEERRKEIERREAAKRELERQR-QLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFE 481
Cdd:TIGR02168  425 ELLKKLEEAELKELQAELEELEEELEELQEELERLEEALEELReELEEAEQALDAAERELAQLQARLDSLERLQENLEGF 504

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    482 LEAL-NDKKHQ---------------------------LEGKLQDIRCR-LTTQRQEIESTNKSRELRIA---------- 522
Cdd:TIGR02168  505 SEGVkALLKNQsglsgilgvlselisvdegyeaaieaaLGGRLQAVVVEnLNAAKKAIAFLKQNELGRVTflpldsikgt 584

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    523 --EITHLQQQLQESQQMLGRLIPEKQ------ILNDQLKQV-----------QQNSLHRD-SLVTLK-----------RA 571
Cdd:TIGR02168  585 eiQGNDREILKNIEGFLGVAKDLVKFdpklrkALSYLLGGVlvvddldnaleLAKKLRPGyRIVTLDgdlvrpggvitGG 664

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    572 LEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELReihnKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQR 651
Cdd:TIGR02168  665 SAKTNSSILERRREIEELEEKIEELEEKIAELEKALAELR----KELEELEEELEQLRKELEELSRQISALRKDLARLEA 740

                          410       420       430       440       450
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123    652 RAQERDKQWlehVQQEDEHQRPRKLHEEEKLKREESVKKKDGEEKGKQEAQDKLGRL 708
Cdd:TIGR02168  741 EVEQLEERI---AQLSKELTELEAEIEELEERLEEAEEELAEAEAEIEELEAQIEQL 794

Src homology 3 domain of Yes Protein Tyrosine Kinase; Yes (or c-Yes) is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. c-Yes kinase is the cellular homolog of the oncogenic protein (v-Yes) encoded by the Yamaguchi 73 and Esh sarcoma viruses. It displays functional overlap with other Src subfamily members, particularly Src. It also shows some unique functions such as binding to occludins, transmembrane proteins that regulate extracellular interactions in tight junctions. Yes also associates with a number of proteins in different cell types that Src does not interact with, like JAK2 and gp130 in pre-adipocytes, and Pyk2 in treated pulmonary vein endothelial cells. Although the biological function of Yes remains unclear, it appears to have a role in regulating cell-cell interactions and vesicle trafficking in polarized cells. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212940 [Multi-domain] Cd Length: 58 Bit Score: 48.11 E-value: 5.32e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTG--TVGDKAGVFPSNYVRLKD 1059
Cdd:cd12007    3 FVALYDYEARTTEDLSFKKGERFqIINNTEGDWWEArsIATGKNGYIPSNYVAPAD 58

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 3 (Stac3); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212919 [Multi-domain] Cd Length: 53 Bit Score: 47.98 E-value: 5.46e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11986    3 VALYRFKALEKDDLDFHPGERITVIDDSNEEWWRGKIGEKTGYFPMNFI 51

Src homology 3 domain of the Rho guanine nucleotide exchange factor ARHGEF9; ARHGEF9, also called PEM2 or collybistin, selectively activates Cdc42 by exchanging bound GDP for free GTP. It is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. Mutations in the ARHGEF9 gene cause X-linked mental retardation with associated features like seizures, hyper-anxiety, aggressive behavior, and sensory hyperarousal. ARHGEF9 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212908 Cd Length: 62 Bit Score: 48.17 E-value: 5.50e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1162 GMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11975    9 AVWDHVTMANRELAFKAGDVIKVLDASNKDWWWGQIDDEEGWFPASFVRL 58

Src Homology 3 domain of Nephrocystin (or Nephrocystin-1); Nephrocystin contains an SH3 domain involved in signaling pathways that regulate cell adhesion and cytoskeletal organization. It is a protein that in humans is associated with juvenile nephronophthisis, an inherited kidney disease characterized by renal fibrosis that lead to chronic renal failure in children. It is localized in cell-cell junctions in renal duct cells, and is known to interact with Ack1, an activated Cdc42-associated kinase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212704 [Multi-domain] Cd Length: 54 Bit Score: 48.08 E-value: 5.57e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDV--ILVTKKDGdWWTG--TVGDKaGVFPSNYVRL 1057
Cdd:cd11770    1 LYEALSDFQAEQEGDLSFKKGEVlrIISKRADG-WWLAenSKGNR-GLVPKTYLKV 54

C-terminal Src Homology 3 domain of LIM and SH3 domain protein 1; Lasp1 is a cytoplasmic protein that binds focal adhesion proteins and is involved in cell signaling, migration, and proliferation. It is overexpressed in several cancer cells including breast, ovarian, bladder, and liver. In cancer cells, it can be found in the nucleus; its degree of nuclear localization correlates with tumor size and poor prognosis. Lasp1 is a 36kD protein containing an N-terminal LIM domain, two nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212867 [Multi-domain] Cd Length: 59 Bit Score: 48.07 E-value: 5.71e-07

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVmvkgewVDESQTGEpGWLGG--ELKGKTGWFPANYAEKI 804
Cdd:cd11934    5 YRAVYDYNAADEDEVSFQDGDTI------VNVQQIDD-GWMYGtvERTGDTGMLPANYVEAI 59

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 47.89 E-value: 5.82e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  746 RALYPFESRSHDE-ITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANY 800
Cdd:cd11829    3 RTLYAFTGEQHQQgLSFEAGELIRV-------LQAPDGGWWEGEKDGLRGWFPASY 51

Third Src homology 3 domain (or SH3C) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (SH3C) of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212925 Cd Length: 52 Bit Score: 47.70 E-value: 5.86e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd11992    4 ALYPYSSSEPGDLTFNEGEEILVTQKDGEWWTGSIEDRTGIFPSNYVR 51

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 47.72 E-value: 5.96e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGE--VQGQKGWFPKSYV 966
Cdd:cd11793    1 QVQCVHAYTAQQPDELTLEEGDVVNVLRKmPDGWYEGErlRDGERGWFPSSYT 53

Second Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the second SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212716 [Multi-domain] Cd Length: 53 Bit Score: 47.73 E-value: 6.01e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQKGWFPKSYVK 967
Cdd:cd11782    1 EARAKYNFNADTGVELSFRKGDVITLTRRVDENWYeGRIGGRQGIFPVSYVQ 52

Src homology 3 domain of Slit-Robo GTPase Activating Proteins; Slit-Robo GTPase Activating Proteins (srGAPs) are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. Vertebrates contain three isoforms of srGAPs (srGAP1-3), all of which are expressed during embryonic and early development in the nervous system but with different localization and timing. A fourth member has also been reported (srGAP4, also called ARHGAP4). srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212743 [Multi-domain] Cd Length: 53 Bit Score: 47.78 E-value: 6.09e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11809    1 EATAQFDYTGRSERELSFKKGDSLtLYRQVSDDWWRGQLNGQDGLVPHKYITL 53

C-terminal Src Homology 3 domain of LIM and SH3 domain protein 1; Lasp1 is a cytoplasmic protein that binds focal adhesion proteins and is involved in cell signaling, migration, and proliferation. It is overexpressed in several cancer cells including breast, ovarian, bladder, and liver. In cancer cells, it can be found in the nucleus; its degree of nuclear localization correlates with tumor size and poor prognosis. Lasp1 is a 36kD protein containing an N-terminal LIM domain, two nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212867 [Multi-domain] Cd Length: 59 Bit Score: 48.07 E-value: 6.12e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1162 GMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEV--NGQVGLFPSNYVK 1210
Cdd:cd11934    7 AVYDYNAADEDEVSFQDGDTIVNVQQIDDGWMYGTVerTGDTGMLPANYVE 57

N-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212881 [Multi-domain] Cd Length: 54 Bit Score: 47.89 E-value: 6.27e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVT--KKDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11948    1 EAVALYSFQATESDELPFQKGDILKILnmEDDQNWYKAELQGREGYIPKNYIKV 54

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 47.63 E-value: 6.31e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd11856    1 SYVAIADYEAQGDDEISLQEGEVVEVLEKnDSGWWYVRKGDKEGWVPASYLE 52

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 47.85 E-value: 6.34e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVkgewVDESqtgEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11820    4 RALYDFEAAEDNELTFKAGEIITV----LDDS---DPNWWKGSNHRGEGLFPANFVTA 54

Src Homology 3 domain of Class A and B Dedicator of Cytokinesis proteins; DOCK proteins are atypical guanine nucleotide exchange factors (GEFs) that lack the conventional Dbl homology (DH) domain. They are divided into four classes (A-D) based on sequence similarity and domain architecture: class A includes Dock1, 2 and 5; class B includes Dock3 and 4; class C includes Dock6, 7, and 8; and class D includes Dock9, 10 and 11. All DOCKs contain two homology domains: the DHR-1 (Dock homology region-1), also called CZH1 (CED-5, Dock180, and MBC-zizimin homology 1), and DHR-2 (also called CZH2 or Docker). The DHR-1 domain binds phosphatidylinositol-3,4,5-triphosphate while DHR-2 contains the catalytic activity for Rac and/or Cdc42. This subfamily includes only Class A and B DOCKs, which also contain an SH3 domain at the N-terminal region and a PxxP motif at the C-terminus. Class A/B DOCKs are mostly specific GEFs for Rac, except Dock4 which activates the Ras family GTPase Rap1, probably indirectly through interaction with Rap regulatory proteins. The SH3 domain of class A/B DOCKs have been shown to bind Elmo, a scaffold protein that promotes GEF activity of DOCKs by releasing DHR-2 autoinhibition by the intramolecular SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212805 [Multi-domain] Cd Length: 56 Bit Score: 47.96 E-value: 6.41e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGEVQ---GQKGWFPKSYVKL 968
Cdd:cd11872    4 AIYNFQGDGEHQLSLQVGDTVQILEECEGWYRGFSLrnkSLKGIFPKSYVHI 55

Src homology 3 domain of Slit-Robo GTPase Activating Protein 4; srGAP4, also called ARHGAP4, is highly expressed in hematopoietic cells and may play a role in lymphocyte differentiation. It is able to stimulate the GTPase activity of Rac1, Cdc42, and RhoA. In the nervous system, srGAP4 has been detected in differentiating neurites and may be involved in axon and dendritic growth. srGAPs are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212889 [Multi-domain] Cd Length: 55 Bit Score: 47.91 E-value: 6.46e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILV-TKKDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11956    3 EAVACFDYTGRTAQELSFKRGDVLLLhSKASSDWWRGEHNGMRGLIPHKYISV 55

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 47.67 E-value: 6.48e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1080 QVIA--SYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQArgkkrQIGWFPANYVKL 1135
Cdd:cd11996    2 QVIAmyDYTANNEDELSFSKGQLINVLNKDDPDWWQGEING-----VTGLFPSNYVKM 54

First Src homology 3 domain (or SH3A) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212770 [Multi-domain] Cd Length: 55 Bit Score: 47.74 E-value: 6.54e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKDG---DWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11836    4 ALYAFEARNPDEISFQPGDIIQVDESQVaepGWLAGELKGKTGWFPANYV 53

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 47.63 E-value: 7.03e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1081 VIASYTATGPEQLTLAPGQLILIRKKNPGGWWegelQARGKKRQiGWFPANYVK 1134
Cdd:cd11856    4 AIADYEAQGDDEISLQEGEVVEVLEKNDSGWW----YVRKGDKE-GWVPASYLE 52

Src homology 3 domain of Fyn and Yrk Protein Tyrosine Kinases; Fyn and Yrk (Yes-related kinase) are members of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Fyn, together with Lck, plays a critical role in T-cell signal transduction by phosphorylating ITAM (immunoreceptor tyr activation motif) sequences on T-cell receptors, ultimately leading to the proliferation and differentiation of T-cells. In addition, Fyn is involved in the myelination of neurons, and is implicated in Alzheimer's and Parkinson's diseases. Yrk has been detected only in chickens. It is primarily found in neuronal and epithelial cells and in macrophages. It may play a role in inflammation and in response to injury. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212939 [Multi-domain] Cd Length: 56 Bit Score: 47.74 E-value: 7.04e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTG---TVGDkAGVFPSNYV 1055
Cdd:cd12006    3 FVALYDYEARTEDDLSFHKGEKFqILNSSEGDWWEArslTTGE-TGYIPSNYV 54

Src homology 3 domain of Slit-Robo GTPase Activating Proteins 1, 2, and 3; srGAP1, also called Rho GTPase-Activating Protein 13 (ARHGAP13), is a Cdc42- and RhoA-specific GAP and is expressed later in the development of central nervous system tissues. srGAP2 is expressed in zones of neuronal differentiation. It plays a role in the regeneration of neurons and axons. srGAP3, also called MEGAP (MEntal disorder associated GTPase-Activating Protein), is a Rho GAP with activity towards Rac1 and Cdc42. It impacts cell migration by regulating actin and microtubule cytoskeletal dynamics. The association between srGAP3 haploinsufficiency and mental retardation is under debate. srGAPs are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212888 [Multi-domain] Cd Length: 53 Bit Score: 47.63 E-value: 7.44e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11955    1 EAIAKFDYVGRSARELSFKKGASLLLYHRASDDWWEGRHNGIDGLVPHQYI 51

Third Src homology 3 domain (or SH3C) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212924 Cd Length: 52 Bit Score: 47.67 E-value: 7.48e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11991    4 AMYTYESNEQGDLTFQQGDVILVTKKDGDWWTGTVGDKTGVFPSNYVRP 52

Arginine and glutamate-rich 1; ARGLU, arginine and glutamate-rich 1 protein family, is required for the oestrogen-dependent expression of ESR1 target genes. It functions in cooperation with MED1. The family of proteins is found in eukaryotes.

Pssm-ID: 405931 [Multi-domain] Cd Length: 151 Bit Score: 50.43 E-value: 7.61e-07

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    568 LKRALEAKELARQHLRDqlDEVEKETRSKLQEI-DIFNNQLKELREIHNKQQLQKQKSM-EAERLKQKEQERKIIELEKQ 645
Cdd:pfam15346   16 VEEAVAKRVEEELEKRK--DEIEAEVERRVEEArKIMEKQVLEELEREREAELEEERRKeEEERKKREELERILEENNRK 93

                           90       100       110       120
                   ....*....|....*....|....*....|....*....|...
gi 47717123    646 KEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKREESV 688
Cdd:pfam15346   94 IEEAQRKEAEERLAMLEEQRRMKEERQRREKEEEEREKREQQK 136

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 47.66 E-value: 7.66e-07

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  746 RALYPFESRSHD-EITIQPGDIVMVKGEwvdESQTGEP-GWLGGELK-GKTGWFPANYAE 802
Cdd:cd11771    3 RALYDFTPENPEmELSLKKGDIVAVLSK---TDPLGRDsEWWKGRTRdGRIGWFPSNYVE 59

Src homology 3 domain of Src Protein Tyrosine Kinase; Src (or c-Src) is a cytoplasmic (or non-receptor) PTK and is the vertebrate homolog of the oncogenic protein (v-Src) from Rous sarcoma virus. Together with other Src subfamily proteins, it is involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. Src also play a role in regulating cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Elevated levels of Src kinase activity have been reported in a variety of human cancers. Several inhibitors of Src have been developed as anti-cancer drugs. Src is also implicated in acute inflammatory responses and osteoclast function. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212941 [Multi-domain] Cd Length: 56 Bit Score: 47.80 E-value: 7.74e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTG---TVGdKAGVFPSNYV 1055
Cdd:cd12008    2 FVALYDYESRTETDLSFKKGERLqIVNNTEGDWWLAhslTTG-QTGYIPSNYV 53

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 47.32 E-value: 7.86e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1081 VIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARgkkrqIGWFPANYV 1133
Cdd:cd11826    4 ALYDYTADKDDELSFQEGDIIYVTKKNDDGWYEGVLNGV-----TGLFPGNYV 51

Src Homology 3 domain of Amphiphysin and related domains; Amphiphysins function primarily in endocytosis and other membrane remodeling events. They exist in several isoforms and mammals possess two amphiphysin proteins from distinct genes. Amphiphysin I proteins, enriched in the brain and nervous system, contain domains that bind clathrin, Adaptor Protein complex 2 (AP2), dynamin, and synaptojanin. They function in synaptic vesicle endocytosis. Human autoantibodies to amphiphysin I hinder GABAergic signaling and contribute to the pathogenesis of paraneoplastic stiff-person syndrome. Some amphiphysin II isoforms, also called Bridging integrator 1 (Bin1), are localized in many different tissues and may function in intracellular vesicle trafficking. In skeletal muscle, Bin1 plays a role in the organization and maintenance of the T-tubule network. Mutations in Bin1 are associated with autosomal recessive centronuclear myopathy. Amphiphysins contain an N-terminal BAR domain with an additional N-terminal amphipathic helix (an N-BAR), a variable central domain, and a C-terminal SH3 domain. The SH3 domain of amphiphysins bind proline-rich motifs present in binding partners such as dynamin, synaptojanin, and nsP3. It also belongs to a subset of SH3 domains that bind ubiquitin in a site that overlaps with the peptide binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212724 [Multi-domain] Cd Length: 64 Bit Score: 47.71 E-value: 7.90e-07

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKgEWVDESQTGEpGWLGG--ELKGKTGWFPANYAEKI 804
Cdd:cd11790    6 RATHDYTAEDTDELTFEKGDVILVI-PFDDPEEQDE-GWLMGvkESTGCRGVFPENFTERI 64

Second Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the second SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213009 [Multi-domain] Cd Length: 54 Bit Score: 47.72 E-value: 7.99e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12076    6 IYPYTARDQDEINLEKGAVVEVIQKNLEGWWKIRYQGKEGWAPASYLK 53

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 47.63 E-value: 8.09e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKDGD--WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11976    4 ARYDFCARDRSELSLKEGDIIKILNKKGQqgWWRGEIYGRVGWFPANYV 52

C2 domain second repeat present in Synaptotagmin-like proteins; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 176015 [Multi-domain] Cd Length: 105 Bit Score: 49.10 E-value: 8.46e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1612 RSHGKSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQ 1668
Cdd:cd04050   16 KSTKEPSPYVELTVGKTTQKSKVKERTNNPVWEEGFTFLVRNPENQELEIEVKDDKT 72

First Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212854 Cd Length: 55 Bit Score: 47.61 E-value: 8.68e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11921    7 FDFQAQSPKELTLQKGDIVYIHKEVDKNWLEGEHHGRVGIFPANYVEV 54

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 47.33 E-value: 8.72e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQG-----QKGWFPKSYVKL 968
Cdd:cd11839    2 AQVIAPFTATAENQLSLAVGQLVLVRKKSPSgWWEGELQArgkkrQIGWFPANYVKL 58

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 47.41 E-value: 9.11e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELqaRGKKrqiGWFPANYV 1133
Cdd:cd11827    2 CKALYAYDAQDTDELSFNEGDIIEILKEDPSGWWTGRL--RGKE---GLFPGNYV 51

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 47.26 E-value: 9.13e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1080 QVIA--SYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQArgkkrQIGWFPANYVKL 1135
Cdd:cd11995    2 QVIGmyDYTAQNDDELAFSKGQIINVLNKEDPDWWKGELNG-----QVGLFPSNYVKL 54

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 47.34 E-value: 9.30e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARgkkrqIGWFPANYV 1133
Cdd:cd11901    4 AYVKFNYTAEREDELSLVKGTKVIVMEKCSDGWWRGSYNGQ-----VGWFPSNYV 53

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 47.12 E-value: 9.42e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123  919 QALYPWRAKKDNH-LNFNKNDVITVLEQQD-MWWFGEVQGQKGWFPKSYV 966
Cdd:cd11829    3 RTLYAFTGEQHQQgLSFEAGELIRVLQAPDgGWWEGEKDGLRGWFPASYV 52

C-terminal Src Homology 3 domain of Nebulin; Nebulin is a giant filamentous protein (600-900 kD) that is expressed abundantly in skeletal muscle. It binds to actin thin filaments and regulates its assembly and function. Nebulin was thought to be part of a molecular ruler complex that is critical in determining the lengths of actin thin filaments in skeletal muscle since its length, which varies due to alternative splicing, correlates with the length of thin filaments in various muscle types. Recent studies indicate that nebulin regulates thin filament length by stabilizing the filaments and preventing depolymerization. Mutations in nebulin can cause nemaline myopathy, characterized by muscle weakness which can be severe and can lead to neonatal lethality. Nebulin contains an N-terminal LIM domain, many nebulin repeats/super repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212866 [Multi-domain] Cd Length: 58 Bit Score: 47.31 E-value: 9.57e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVN--GQVGLFPSNYVK 1210
Cdd:cd11933    7 MYDYRAADDDEVSFKDGDTIVNVQTIDEGWMYGTVQrtGKTGMLPANYVE 56

C-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domains (SH3c) of the related proteins, GRB2 and GRAP2, have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212884 Cd Length: 53 Bit Score: 47.10 E-value: 9.70e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11951    4 AQYDFSAEDPSQLSFRRGDIIEVLDCpDPNWWRGRISGRVGFFPRNYV 51

C-terminal Src Homology 3 domain of the p67phox subunit of NADPH oxidase and similar proteins; This subfamily is composed of p67phox, NADPH oxidase activator 1 (Noxa1), and similar proteins. p67phox, also called Neutrophil cytosol factor 2 (NCF-2), and Noxa1 are homologs and are the cytosolic subunits of the phagocytic (Nox2) and nonphagocytic (Nox1) NADPH oxidase complexes, respectively. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox and Noxa1 play regulatory roles. p67phox contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. Noxa1 has a similar domain architecture except it is lacking the N-terminal SH3 domain. The TPR domain of both binds activated GTP-bound Rac, while the C-terminal SH3 domain of p67phox and Noxa1 binds the polyproline motif found at the C-terminus of p47phox and Noxo1, respectively. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212803 [Multi-domain] Cd Length: 53 Bit Score: 47.14 E-value: 9.84e-07

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILV-TKKDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11870    3 VALHRYEAQGPEDLGFREGDTIDVlSEVNEAWLEGHSDGRVGIFPKCFV 51

Src Homology 3 domain of Myosin XV; This subfamily is composed of proteins with similarity to Myosin XVa. Myosin XVa is an unconventional myosin that is critical for the normal growth of mechanosensory stereocilia of inner ear hair cells. Mutations in the myosin XVa gene are associated with nonsyndromic hearing loss. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212817 [Multi-domain] Cd Length: 56 Bit Score: 47.32 E-value: 9.87e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVkgewVDESQTGEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11884    1 YVVAVRAYITRDQTLLSFHKGDVIKL----LPKEGPLDPGWLFGTLDGRSGAFPKEYVQ 55

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member 4; CASS4, also called HEPL (HEF1-EFS-p130Cas-like), localizes to focal adhesions and plays a role in regulating FAK activity, focal adhesion integrity, and cell spreading. It is most abundant in blood cells and lung tissue, and is also found in high levels in leukemia and ovarian cell lines. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212933 Cd Length: 57 Bit Score: 47.18 E-value: 9.89e-07

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPD---WWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd12000    6 LYDNKADCSDELAFRRGDILTVLEQNVPGsegWWKCLLHGRQGLAPANRLQL 57

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 46.92 E-value: 1.08e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTV---GDKAGVFPSNY 1054
Cdd:cd11821    4 ALYDCQADNDDELTFSEGEIIVVTGEeDDEWWEGHIegdPSRRGVFPVSF 53

Src Homology 3 domain of TXK, also called Resting lymphocyte kinase (Rlk); TXK is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal cysteine-rich region. Rlk is expressed in T-cells and mast cell lines, and is a key component of T-cell receptor (TCR) signaling. It is important in TCR-stimulated proliferation, IL-2 production and phospholipase C-gamma1 activation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212840 [Multi-domain] Cd Length: 55 Bit Score: 47.26 E-value: 1.09e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVN-GQVGLFPSNYV 1209
Cdd:cd11907    2 QVKALYDFLPREPSNLALKRAEEYLILEQYDPHWWKARDRyGNEGLIPSNYV 53

First Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212862 Cd Length: 54 Bit Score: 47.24 E-value: 1.09e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11929    5 ALCNYRGHNPGDLKFNKGDVILLRRQlDENWYLGEINGVSGIFPASSVEV 54

Second Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the second SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212949 Cd Length: 54 Bit Score: 47.07 E-value: 1.09e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12016    2 KYITTQAYKAENEDEIGFETGVVVEVIQKNLDGWWKIRYQGKEGWAPATYLK 53

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase 2; GRAF2, also called Rho GTPase activating protein 10 (ARHGAP10) or PS-GAP, is a GAP with activity towards Cdc42 and RhoA. It regulates caspase-activated p21-activated protein kinase-2 (PAK-2p34). GRAF2 interacts with PAK-2p34, leading to its stabilization and decrease of cell death. It is highly expressed in skeletal muscle, and is involved in alpha-catenin recruitment at cell-cell junctions. GRAF2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212998 [Multi-domain] Cd Length: 54 Bit Score: 47.29 E-value: 1.10e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIvmvkgeWVDESQTGEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd12065    3 KAVYPCEAEHSSELSFEVGAI------FEDVTLSREPGWLEGTLNGKRGLIPENYVE 53

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 53.79 E-value: 1.11e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  335 LEDEQQQLEKKlpvtfEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKQLE 414
Cdd:COG1196  426 LEEALAELEEE-----EEEEEEALEEAAEEEAELEEEEEALLELLAELLEEAALLEAALAELLEELAEAAARLLLLLEAE 500

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  415 KQRELERQREEERRKEIERRE----------------------AAKRELERQRQLEWERNRRQELLNQRNK--------- 463
Cdd:COG1196  501 ADYEGFLEGVKAALLLAGLRGlagavavligveaayeaaleaaLAAALQNIVVEDDEVAAAAIEYLKAAKAgratflpld 580

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  464 --EQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIR--CRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLG 539
Cdd:COG1196  581 kiRARAALAAALARGAIGAAVDLVASDLREADARYYVLGdtLLGRTLVAARLEAALRRAVTLAGRLREVTLEGEGGSAGG 660

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  540 RLIPEKQILNDQLKQVQQN--SLHRDSLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQ 617
Cdd:COG1196  661 SLTGGSRRELLAALLEAEAelEELAERLAEEELELEEALLAEEEEERELAEAEEERLEEELEEEALEEQLEAEREELLEE 740

                        330       340       350
                 ....*....|....*....|....*....|....*
gi 47717123  618 QLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRR 652
Cdd:COG1196  741 LLEEEELLEEEALEELPEPPDLEELERELERLERE 775

DNA double-strand break repair Rad50 ATPase;

Pssm-ID: 179385 [Multi-domain] Cd Length: 880 Bit Score: 53.51 E-value: 1.11e-06

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   327 QRLPEEPVLEDEQQQLEKKLPVTFedKKRENFERgnlELEKRRQALLEQQRKEQERLAQ--LERAEQERKERERQEQERK 404
Cdd:PRK02224  248 ERREELETLEAEIEDLRETIAETE--REREELAE---EVRDLRERLEELEEERDDLLAEagLDDADAEAVEARREELEDR 322

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   405 RQlELEKQLEKQRELERQREEErrkeierreaAKRELERQRQLEwERNrrQELLNQRNKEQEDIVVLKAKKKTLEFELEA 484
Cdd:PRK02224  323 DE-ELRDRLEECRVAAQAHNEE----------AESLREDADDLE-ERA--EELREEAAELESELEEAREAVEDRREEIEE 388

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   485 LNDKKHQLEGKLQDIrcrlTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLK-----QVQQNS 559
Cdd:PRK02224  389 LEEEIEELRERFGDA----PVDLGNAEDFLEELREERDELREREAELEATLRTARERVEEAEALLEAGKcpecgQPVEGS 464

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   560 LHRDSLVTLKRALEAKELARQHLRDQLDEVEKETrsklqeidifnNQLKELREIHNK-QQLQKQKSMEAERLKQK----- 633
Cdd:PRK02224  465 PHVETIEEDRERVEELEAELEDLEEEVEEVEERL-----------ERAEDLVEAEDRiERLEERREDLEELIAERretie 533

                         330       340       350       360       370       380       390
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123   634 EQERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEK--LKRE-ESVKKKDGEEKGKQEAQDKLGRL 708
Cdd:PRK02224  534 EKRERAEELRERAAELEAEAEEKREAAAEAEEEAEEAREEVAELNSKLaeLKERiESLERIRTLLAAIADAEDEIERL 611

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 47.24 E-value: 1.12e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQ--QDMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd11830    2 AKARYDFCARDMRELSLKEGDVVKIYNKkgQQGWWRGEINGRIGWFPSTYVE 53

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 47.13 E-value: 1.15e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  747 ALYPFESRSHDEITIQPGDIVmVKGEWVDEsqtgepGWLGGELKGKTGWFPANYAE 802
Cdd:cd12073    5 ALYDYQGEGDDEISFDPQETI-TDIEMVDE------GWWKGTCHGHRGLFPANYVE 53

Src Homology 3 domain of Myosin XV; This subfamily is composed of proteins with similarity to Myosin XVa. Myosin XVa is an unconventional myosin that is critical for the normal growth of mechanosensory stereocilia of inner ear hair cells. Mutations in the myosin XVa gene are associated with nonsyndromic hearing loss. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212817 [Multi-domain] Cd Length: 56 Bit Score: 46.94 E-value: 1.18e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGD----WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11884    3 VAVRAYITRDQTLLSFHKGDVIKLLPKEGPldpgWLFGTLDGRSGAFPKEYV 54

C-terminal Src Homology 3 domain of LIM and SH3 domain protein 1; Lasp1 is a cytoplasmic protein that binds focal adhesion proteins and is involved in cell signaling, migration, and proliferation. It is overexpressed in several cancer cells including breast, ovarian, bladder, and liver. In cancer cells, it can be found in the nucleus; its degree of nuclear localization correlates with tumor size and poor prognosis. Lasp1 is a 36kD protein containing an N-terminal LIM domain, two nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212867 [Multi-domain] Cd Length: 59 Bit Score: 47.30 E-value: 1.22e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1003 SGEEFIAMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTV---GDKaGVFPSNYV 1055
Cdd:cd11934    1 GGKRYRAVYDYNAADEDEVSFQDGDTIVnVQQIDDGWMYGTVertGDT-GMLPANYV 56

C2 domain fifth repeat in Ferlin; Ferlins are involved in vesicle fusion events. Ferlins and other proteins, such as Synaptotagmins, are implicated in facilitating the fusion process when cell membranes fuse together. There are six known human Ferlins: Dysferlin (Fer1L1), Otoferlin (Fer1L2), Myoferlin (Fer1L3), Fer1L4, Fer1L5, and Fer1L6. Defects in these genes can lead to a wide range of diseases including muscular dystrophy (dysferlin), deafness (otoferlin), and infertility (fer-1, fertilization factor-1). Structurally they have 6 tandem C2 domains, designated as (C2A-C2F) and a single C-terminal transmembrane domain, though there is a new study that disputes this and claims that there are actually 7 tandem C2 domains with another C2 domain inserted between C2D and C2E. In a subset of them (Dysferlin, Myoferlin, and Fer1) there is an additional conserved domain called DysF. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the fifth C2 repeat, C2E, and has a type-II topology.

Pssm-ID: 176002 [Multi-domain] Cd Length: 124 Bit Score: 49.09 E-value: 1.22e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1600 VNVVEGIELKPCRSHGKSNPYCEVTMGSQCHITK--TIQDTLNPKWNsncQFFIRD--LEQE-VLCITVFERDQFSPDDF 1674
Cdd:cd04037    4 VYVVRARNLQPKDPNGKSDPYLKIKLGKKKINDRdnYIPNTLNPVFG---KMFELEatLPGNsILKISVMDYDLLGSDDL 80


                 ....*.
gi 47717123 1675 LGRTEI 1680
Cdd:cd04037   81 IGETVI 86

Uncharacterized protein, contains DUF3084 domain [Function unknown];

Pssm-ID: 443500 [Multi-domain] Cd Length: 370 Bit Score: 52.60 E-value: 1.25e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  366 EKRRQALLEQQRKEQER---LAQLERAEQERKERERQ-EQERKRQLELEKQL-EKQRELERQREEERRKEIERREAAKRE 440
Cdd:COG4372   31 EQLRKALFELDKLQEELeqlREELEQAREELEQLEEElEQARSELEQLEEELeELNEQLQAAQAELAQAQEELESLQEEA 110

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  441 LERQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQdircRLTTQRQEIESTNKSREL- 519
Cdd:COG4372  111 EELQEELEELQKERQDLEQQRKQLEAQIAELQSEIAEREEELKELEEQLESLQEELA----ALEQELQALSEAEAEQALd 186

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  520 RIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRDSLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQE 599
Cdd:COG4372  187 ELLKEANRNAEKEEELAEAEKLIESLPRELAEELLEAKDSLEAKLGLALSALLDALELEEDKEELLEEVILKEIEELELA 266

                        250       260       270       280       290       300       310
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  600 IDIFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDE 669
Cdd:COG4372  267 ILVEKDTEEEELEIAALELEALEEAALELKLLALLLNLAALSLIGALEDALLAALLELAKKLELALAILL 336

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 46.92 E-value: 1.27e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  746 RALYPFESRSHDEITIQPGDIVmVKGEWVDEsqtgepGWLGGEL-KGKTGWFPANYAE 802
Cdd:cd11819    3 KALYDYQAAEDNEISFVEGDII-TQIEQIDE------GWWLGVNaKGQKGLFPANYVE 53

Myosin tail; The myosin molecule is a multi-subunit complex made up of two heavy chains and four light chains it is a fundamental contractile protein found in all eukaryote cell types. This family consists of the coiled-coil myosin heavy chain tail region. The coiled-coil is composed of the tail from two molecules of myosin. These can then assemble into the macromolecular thick filament. The coiled-coil region provides the structural backbone the thick filament.

Pssm-ID: 460256 [Multi-domain] Cd Length: 1081 Bit Score: 53.64 E-value: 1.31e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEK---KLPVTFEDKKrENFERgnlELEKRRQALLEQQRKEQERLAQLE-RAEQERKERErQEQERKRQLELE 410
Cdd:pfam01576  704 LEDELQATEDaklRLEVNMQALK-AQFER---DLQARDEQGEEKRRQLVKQVRELEaELEDERKQRA-QAVAAKKKLELD 778

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    411 -KQLEKQRELERQREEERRKEIERREAAKRELerQRQLEWERNRRQELLNQ-RNKE-------------QEDIVVLKAKK 475
Cdd:pfam01576  779 lKELEAQIDAANKGREEAVKQLKKLQAQMKDL--QRELEEARASRDEILAQsKESEkklknleaellqlQEDLAASERAR 856

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    476 KTLEFELEALNDK-KHQLEGK--LQDIRCRLTTQRQEIESTNKSRELRIaeithlqqqlqesqqmlgrlipekQILNDQL 552
Cdd:pfam01576  857 RQAQQERDELADEiASGASGKsaLQDEKRRLEARIAQLEEELEEEQSNT------------------------ELLNDRL 912

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    553 -KQVQQNSLHRDSLVTLKRALEAKELARQHLRDQldevEKETRSKLQEIDifnNQLK----------ELREIHNKQQLQ- 620
Cdd:pfam01576  913 rKSTLQVEQLTTELAAERSTSQKSESARQQLERQ----NKELKAKLQEME---GTVKskfkssiaalEAKIAQLEEQLEq 985

                          330       340       350       360       370       380       390
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123    621 --KQKSMEAERLKQKeqERKIIELEKQKEEAQRRAQE----------RDKQwLEHVQQEDEHQRPRKLHEEEKLKRE 685
Cdd:pfam01576  986 esRERQAANKLVRRT--EKKLKEVLLQVEDERRHADQykdqaekgnsRMKQ-LKRQLEEAEEEASRANAARRKLQRE 1059

Src homology 3 domain of Signal Transducing Adaptor Molecule 1; STAM1 is part of the endosomal sorting complex required for transport (ESCRT-0) and is involved in sorting ubiquitinated cargo proteins from the endosome. It may also be involved in the regulation of IL2 and GM-CSF mediated signaling, and has been implicated in neural cell survival. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212897 [Multi-domain] Cd Length: 55 Bit Score: 46.87 E-value: 1.33e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVkgewVDESqtgEPGWLGGELKGKTGWFPANY 800
Cdd:cd11964    4 RAIYDFEAAEDNELTFKAGDIITI----LDDS---DPNWWKGETPQGTGLFPSNF 51

exonuclease SbcC; All proteins in this family for which functions are known are part of an exonuclease complex with sbcD homologs. This complex is involved in the initiation of recombination to regulate the levels of palindromic sequences in DNA. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

Pssm-ID: 129705 [Multi-domain] Cd Length: 1042 Bit Score: 53.43 E-value: 1.33e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    323 TSVDQRLPEE-PVLEDEQQQLEKKLPVTFEDKK------RENFERGNLELEKRRQALLEQQRKEQErlaQLERAEQERKE 395
Cdd:TIGR00618  576 TQCDNRSKEDiPNLQNITVRLQDLTEKLSEAEDmlaceqHALLRKLQPEQDLQDVRLHLQQCSQEL---ALKLTALHALQ 652

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    396 RERQEQERKRQLELEKQLEKQRELERQREEERRKEIERREAAKRELERQRQLEWeRNRRQELLNQRNKEQEDIVVLKAKK 475
Cdd:TIGR00618  653 LTLTQERVREHALSIRVLPKELLASRQLALQKMQSEKEQLTYWKEMLAQCQTLL-RELETHIEEYDREFNEIENASSSLG 731

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    476 KTLEFELEALNdkkhQLEGKLQDIRcRLTTQRQEIESTNKSRELRIAEIT-HLQQQLQESQQMLGRLIPEKQILNDQLK- 553
Cdd:TIGR00618  732 SDLAAREDALN----QSLKELMHQA-RTVLKARTEAHFNNNEEVTAALQTgAELSHLAAEIQFFNRLREEDTHLLKTLEa 806

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    554 QVQQNSLHRDSLVTLKRALEAKELArqhlrdQLDEVEKETRSKLQEIDifnNQLKELREihNKQQLQkQKSMEAERLKQK 633
Cdd:TIGR00618  807 EIGQEIPSDEDILNLQCETLVQEEE------QFLSRLEEKSATLGEIT---HQLLKYEE--CSKQLA-QLTQEQAKIIQL 874


                   ...
gi 47717123    634 EQE 636
Cdd:TIGR00618  875 SDK 877

Src homology 3 domain of Phospholipase C (PLC) gamma 2; PLCgamma2 is primarily expressed in haematopoietic cells, specifically in B cells. It is activated by tyrosine phosphorylation by B cell receptor (BCR) kinases and is recruited to the plasma membrane where its substrate is located. It is required in pre-BCR signaling and in the maturation of B cells. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212902 Cd Length: 55 Bit Score: 46.76 E-value: 1.33e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTVGDKAG-VFPSNYV 1055
Cdd:cd11969    4 ALYDYRAKRSDELSFCKGALIHnVSKETGGWWKGDYGGKVQhYFPSNYV 52

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 46.94 E-value: 1.36e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYV 966
Cdd:cd11963    3 KVRALYDFEAVEDNELTFKHGEIIIVLDDSDAnWWKGENHRGVGLFPSNFV 53

Src Homology 3 domain of Cytokinesis protein 3 and similar proteins; Cytokinesis protein 3 (Cyk3 or Cyk3p) is a component of the actomyosin ring independent cytokinesis pathway in yeast. It interacts with Inn1 and facilitates its recruitment to the bud neck, thereby promoting cytokinesis. Cyk3p contains an N-terminal SH3 domain and a C-terminal transglutaminase-like domain. The Cyk3p SH3 domain binds to the C-terminal proline-rich region of Inn1. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212822 Cd Length: 53 Bit Score: 46.72 E-value: 1.36e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTK-KDGDWWTGT-VGDKA-GVFPSNYV 1055
Cdd:cd11889    4 AVYSWAGETEGDLGFLEGDLIEVLSiGDGSWWSGKlRRNGAeGIFPSNFV 53

First Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212695 [Multi-domain] Cd Length: 57 Bit Score: 46.97 E-value: 1.36e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1158 CQVIgmYDYTAQNDDELAFNKGQIINVLNKEDPD-WWKG-EVNGQVGLFPSNYVKL 1211
Cdd:cd11761    4 CKVL--YSYEAQRPDELTITEGEELEVIEDGDGDgWVKArNKSGEVGYVPENYLQF 57

First Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The first SH3 domain of Nck proteins preferentially binds the PxxDY sequence, which is present in the CD3e cytoplasmic tail. This binding inhibits phosphorylation by Src kinases, resulting in the downregulation of TCR surface expression. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212699 [Multi-domain] Cd Length: 51 Bit Score: 46.64 E-value: 1.38e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPdWWKGE-VNGQVGLFPSNYV 1209
Cdd:cd11765    2 VVAKYDYTAQGDQELSIKKNEKLTLLDDSKH-WWKVQnSSNQTGYVPSNYV 51

Second Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the second SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213009 [Multi-domain] Cd Length: 54 Bit Score: 46.95 E-value: 1.47e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd12076    3 YTVIYPYTARDQDEINLEKGAVVEV-------IQKNLEGWWKIRYQGKEGWAPASYLKK 54

N-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also have roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212880 [Multi-domain] Cd Length: 52 Bit Score: 46.71 E-value: 1.52e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGEVQGQKGWFPKSYV 966
Cdd:cd11947    1 EARGKFDFTASGEDELSFKKGDVLKILSSDDIWFKAELNGEEGYVPKNFV 50

Third Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212837 [Multi-domain] Cd Length: 57 Bit Score: 46.95 E-value: 1.56e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQD---MWW-FGEVQGQKGWFPKSYVKL 968
Cdd:cd11904    4 QALYPFSSSNDEELNFEKGEVMDVIEKPEndpEWWkCRKANGQVGLVPKNYVTV 57

C-terminal Src Homology 3 domain of Nebulette and LIM-nebulette (or Lasp2); Nebulette is a cardiac-specific protein that localizes to the Z-disc. It interacts with tropomyosin and is important in stabilizing actin thin filaments in cardiac muscles. Polymorphisms in the nebulette gene are associated with dilated cardiomyopathy, with some mutations resulting in severe heart failure. Nebulette is a 107kD protein that contains an N-terminal acidic region, multiple nebulin repeats, and a C-terminal SH3 domain. LIM-nebulette, also called Lasp2 (LIM and SH3 domain protein 2), is an alternatively spliced variant of nebulette. Although it shares a gene with nebulette, Lasp2 is not transcribed from a muscle-specific promoter, giving rise to its multiple tissue expression pattern with highest amounts in the brain. It can crosslink actin filaments and it affects cell spreading. Lasp2 is a 34kD protein containing an N-terminal LIM domain, three nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212868 [Multi-domain] Cd Length: 58 Bit Score: 46.92 E-value: 1.57e-06

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVmVKGEWVDEsqtgepGWLGGELK--GKTGWFPANYAEKI 804
Cdd:cd11935    3 YRAMYDYSAQDEDEVSFRDGDYI-VNVQPIDE------GWMYGTVQrtGRTGMLPANYIEFV 57

First Src Homology 3 domain of SH3 domain containing ring finger protein 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212860 Cd Length: 54 Bit Score: 46.48 E-value: 1.65e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11927    3 AKALYNYEGKEPGDLKFSKGDIIILRRQVDEnWYHGEVNGIHGFFPTNFVQI 54

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 46.50 E-value: 1.83e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  918 AQALYPWRAKKD-NHLNFNKNDVITVLEQQDM------WWFGEVQ-GQKGWFPKSYV 966
Cdd:cd11771    2 CRALYDFTPENPeMELSLKKGDIVAVLSKTDPlgrdseWWKGRTRdGRIGWFPSNYV 58

Src Homology 3 domain of Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2-Like 2; BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. It contains an N-terminal IMD or Inverse-Bin/Amphiphysin/Rvs (I-BAR) domain, an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The related proteins, BAIAP2L1 and IRSp53, function as regulators of membrane dynamics and the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212847 [Multi-domain] Cd Length: 59 Bit Score: 46.73 E-value: 1.89e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|
gi 47717123  932 LNFNKNDVITVL--EQQDMWWFGEVQG--QKGWFPKSYVK 967
Cdd:cd11914   18 LRFNRGDIITVLvpEARNGWLYGKLEGssRQGWFPEAYVK 57

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 46.07 E-value: 1.89e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 47717123   1081 VIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELqaRGKKrqiGWFPANYVK 1134
Cdd:pfam14604    1 ALYPYEPKDDDELSLQRGDVITVIEESEDGWWEGIN--TGRT---GLVPANYVE 49

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 53.15 E-value: 1.90e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEKKLP------VTFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERA------EQERKErerqEQE 402
Cdd:TIGR02169  249 LEEELEKLTEEISelekrlEEIEQLLEELNKKIKDLGEEEQLRVKEKIGELEAEIASLERSiaekerELEDAE----ERL 324

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    403 RKRQLELEKQLEKqrelerqreeerrkeierREAAKRELERQR----QLEWE----RNRRQELLNQRNKEQEDIVVLKAK 474
Cdd:TIGR02169  325 AKLEAEIDKLLAE------------------IEELEREIEEERkrrdKLTEEyaelKEELEDLRAELEEVDKEFAETRDE 386

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    475 KKTLEFELEALNDKKHQLEG---KLQDIRCRLTTQRQEIESTNKSRELRIAEithlqqqlqesqqmlgrLIPEKQILNDQ 551
Cdd:TIGR02169  387 LKDYREKLEKLKREINELKReldRLQEELQRLSEELADLNAAIAGIEAKINE-----------------LEEEKEDKALE 449

                          250       260       270       280       290       300
                   ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123    552 LKQVQQNslhrdsLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELRE 612
Cdd:TIGR02169  450 IKKQEWK------LEQLAADLSKYEQELYDLKEEYDRVEKELSKLQRELAEAEAQARASEE 504

Second Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the second SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212716 [Multi-domain] Cd Length: 53 Bit Score: 46.19 E-value: 1.93e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11782    1 EARAKYNFNADTGVELSFRKGDVITLTRRvDENWYEGRIGGRQGIFPVSYV 51

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 46.54 E-value: 1.94e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQArgkkrQIGWFPANYV 1133
Cdd:cd11902    3 AFVKFAYVAEREDELSLVKGSRVTVMEKCSDGWWRGSYNG-----QIGWFPSNYV 52

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 46.35 E-value: 1.97e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1163 MYDYTA-QNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11829    5 LYAFTGeQHQQGLSFEAGELIRVLQAPDGGWWEGEKDGLRGWFPASYV 52

C2 domain second repeat present in Synaptotagmin; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. There are several classes of Synaptotagmins. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 175975 [Multi-domain] Cd Length: 134 Bit Score: 48.73 E-value: 1.97e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTMGSQCHI-----TKTIQDTLNPKWNsncQFFIRDLEQE-----VLCITVFE 1665
Cdd:cd00276   14 ERLTVVVLKARNLPPSDGKGLSDPYVKVSLLQGGKKlkkkkTSVKKGTLNPVFN---EAFSFDVPAEqleevSLVITVVD 90

                         90
                 ....*....|....*
gi 47717123 1666 RDQFSPDDFLGRTEI 1680
Cdd:cd00276   91 KDSVGRNEVIGQVVL 105

Third (or C-terminal) Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212851 [Multi-domain] Cd Length: 58 Bit Score: 46.49 E-value: 1.97e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKG--EVNGQVGLFPSNYV 1209
Cdd:cd11918    7 VYQYRPQNEDELELREGDRVDVMQQCDDGWFVGvsRRTQKFGTFPGNYV 55

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase; GRAF, also called Rho GTPase activating protein 26 (ARHGAP26), Oligophrenin-1-like (OPHN1L) or GRAF1, is a GAP with activity towards RhoA and Cdc42 and is only weakly active towards Rac1. It influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase (FAK), which is a critical component of integrin signaling. It is essential for the major clathrin-independent endocytic pathway mediated by pleiomorphic membranes. GRAF contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212997 Cd Length: 56 Bit Score: 46.65 E-value: 2.06e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1162 GMYDYTAQNDDELAFNKGQII-NVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd12064    5 ALYACKAEHDSELSFTAGTVFdNVHPSQEPGWLEGTLNGKTGLIPENYVEF 55

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 46.48 E-value: 2.07e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1085 YTATGPEQLTLAPGQLI-LIRKKNPGGWWEGELQARgkkrqIGWFPANYVK 1134
Cdd:cd11976    8 FCARDRSELSLKEGDIIkILNKKGQQGWWRGEIYGR-----VGWFPANYVE 53

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 52.75 E-value: 2.20e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    325 VDQRLPEEPVLEDEQQQLEKKLPVTFEDKKRENFERGnlELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERK 404
Cdd:TIGR02168  749 IAQLSKELTELEAEIEELEERLEEAEEELAEAEAEIE--ELEAQIEQLKEELKALREALDELRAELTLLNEEAANLRERL 826

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    405 RQLELEKQLEKQRELERQREEERRKEIERREAAKRElERQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEA 484
Cdd:TIGR02168  827 ESLERRIAATERRLEDLEEQIEELSEDIESLAAEIE-ELEELIEELESELEALLNERASLEEALALLRSELEELSEELRE 905

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    485 LNDKKHQLEGKLQDIRCRLTTQRQEIESTnksrELRIAEIThlqQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRds 564
Cdd:TIGR02168  906 LESKRSELRRELEELREKLAQLELRLEGL----EVRIDNLQ---ERLSEEYSLTLEEAEALENKIEDDEEEARRRLKR-- 976

                          250       260       270       280       290       300       310
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 47717123    565 lvtLKRAL------------EAKEL----------------ARQHLRDQLDEVEKETRSKLQE-IDIFNNQLKEL 610
Cdd:TIGR02168  977 ---LENKIkelgpvnlaaieEYEELkerydfltaqkedlteAKETLEEAIEEIDREARERFKDtFDQVNENFQRV 1048

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 46.20 E-value: 2.22e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKGEwVDESqtgepgWLGGELKGKTGWFPANYAE 802
Cdd:cd11786    1 CAKALYNYEGKEPGDLSFKKGDIILLRKR-IDEN------WYHGECNGKQGFFPASYVQ 52

NIMA-related protein kinase; Provisional

Pssm-ID: 173502 [Multi-domain] Cd Length: 1021 Bit Score: 52.82 E-value: 2.26e-06

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   325 VDQRLPEEPVLEDEQQQlEKKLPVTFEDKKR-ENFERGNLE-LEKRRQALLEQQRKEQERLAQlERAEQERKERERQEQ- 401
Cdd:PTZ00266  430 VDKDHAERARIEKENAH-RKALEMKILEKKRiERLEREERErLERERMERIERERLERERLER-ERLERDRLERDRLDRl 507

                          90
                  ....*....|....*
gi 47717123   402 ERKRQLELEK-QLEK 415
Cdd:PTZ00266  508 ERERVDRLERdRLEK 522

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 46.04 E-value: 2.26e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1085 YTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGkkrqiGWFPANYVK 1134
Cdd:cd12052    8 YKAQHEDELTITVGDIITKIKKDDGGWWEGEIKGRR-----GLFPDNFVR 52

Uncharacterized coiled-coil protein, contains DUF342 domain [Function unknown];

Pssm-ID: 440951 [Multi-domain] Cd Length: 297 Bit Score: 51.45 E-value: 2.28e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  384 AQLERAEQERKE-RERQEQERKRQLELEKQLEKqrelerqreeerrkeierrEAAKRELERQrQLEWERNRRQELLNQRN 462
Cdd:COG1340    8 SSLEELEEKIEElREEIEELKEKRDELNEELKE-------------------LAEKRDELNA-QVKELREEAQELREKRD 67

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  463 KEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCR---LTTQRQEIE-----------STNKSREL--RIAEIth 526
Cdd:COG1340   68 ELNEKVKELKEERDELNEKLNELREELDELRKELAELNKAggsIDKLRKEIErlewrqqtevlSPEEEKELveKIKEL-- 145

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  527 lqqqlqesqqmlgrlipeKQILNDQLKQVQQnslHRDSLVTLKRALEAKELARQH------LRDQLDEVEKETRSKLQEI 600
Cdd:COG1340  146 ------------------EKELEKAKKALEK---NEKLKELRAELKELRKEAEEIhkkikeLAEEAQELHEEMIELYKEA 204

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  601 DIFNnqlKELREIHnKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAqrraqeRDKQWLEHVQQEDEHQRPRKLHEEE 680
Cdd:COG1340  205 DELR---KEADELH-KEIVEAQEKADELHEEIIELQKELRELRKELKKL------RKKQRALKREKEKEELEEKAEEIFE 274


                 ....*.
gi 47717123  681 KLKREE 686
Cdd:COG1340  275 KLKKGE 280

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing (Stac) proteins; Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. This model represents the first C-terminal SH3 domain of Stac1 and Stac3, and the single C-terminal SH3 domain of Stac2. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212767 [Multi-domain] Cd Length: 53 Bit Score: 46.34 E-value: 2.33e-06

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVkgewVDESqtgEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11833    1 TYVALYKFKPQENEDLEMRPGDKITL----LDDS---NEDWWKGKIEDRVGFFPANFVQR 53

Src Homology 3 domain of the p85 regulatory subunit of Class IA Phosphatidylinositol 3-kinases; Class I PI3Ks convert PtdIns(4,5)P2 to the critical second messenger PtdIns(3,4,5)P3. They are heterodimers and exist in multiple isoforms consisting of one catalytic subunit (out of four isoforms) and one of several regulatory subunits. Class IA PI3Ks associate with the p85 regulatory subunit family, which contains SH3, RhoGAP, and SH2 domains. The p85 subunits recruit the PI3K p110 catalytic subunit to the membrane, where p110 phosphorylates inositol lipids. Vertebrates harbor two p85 isoforms, called alpha and beta. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212710 Cd Length: 72 Bit Score: 46.73 E-value: 2.41e-06

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVKG--------EWVDESQTGEPGWLGG--ELKGKTGWFPANYAE 802
Cdd:cd11776    3 YRALYDYEKERDEDIILKTGDVLVVENpellalgvPDGKETVPKPEGWLEGknERTGERGDFPGTYVE 70

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 46.17 E-value: 2.44e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKD--GDWWTG-TVGDKAGVFPSNYV 1055
Cdd:cd11763    4 ALYDFDSQPSGELSLRAGEVLTITRQDvgDGWLEGrNSRGEVGLFPSSYV 53

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 46.17 E-value: 2.45e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVmvkgEWVDESqtgEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11874    3 KVLFSYTPQNEDELELKVGDTI----EVLGEV---EEGWWEGKLNGKVGVFPSNFVK 52

Predicted nucleic acid-binding protein DR0291, contains C4-type Zn-ribbon domain [General function prediction only];

Pssm-ID: 441187 [Multi-domain] Cd Length: 236 Bit Score: 50.69 E-value: 2.50e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  562 RDSLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREihNKQQLQKQKSMEAERLKQKEQERKIIE 641
Cdd:COG1579   37 EDELAALEARLEAAKTELEDLEKEIKRLELEIEEVEARIKKYEEQLGNVRN--NKEYEALQKEIESLKRRISDLEDEILE 114

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|....*
gi 47717123  642 LEKQKEEAQRRAQERDKQwLEHVQQEDEHQRPRKLHEEEKLKREE 686
Cdd:COG1579  115 LMERIEELEEELAELEAE-LAELEAELEEKKAELDEELAELEAEL 158

Src Homology 3 domain of Membrane Protein, Palmitoylated 1 (or MAGUK p55 subfamily member 1); MPP1, also called 55 kDa erythrocyte membrane protein (p55), is a ubiquitously-expressed scaffolding protein that plays roles in regulating neutrophil polarity, cell shape, hair cell development, and neural development and patterning of the retina. It was originally identified as an erythrocyte protein that stabilizes the actin cytoskeleton to the plasma membrane by forming a complex with 4.1R protein and glycophorin C. MPP1 is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains the three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213013 Cd Length: 62 Bit Score: 46.49 E-value: 2.51e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1162 GMYDYTAQNDD-------ELAFNKGQIINVLNKEDPDWWKGEVNGQ----VGLFPS 1206
Cdd:cd12080    4 AQFDYDPKKDNlipckeaGLKFQTGDIIQIINKDDSNWWQGRVEGSgeesAGLIPS 59

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 45.87 E-value: 2.65e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11959    3 VALYDYQAADDDEISFDPDDIITnIEMIDEGWWRGVCRGKYGLFPANYVEL 53

helix-rich Mycoplasma protein; Members of this family occur strictly within a subset of Mycoplasma species. Members average 750 amino acids in length, including signal peptide. Sequences are predicted (Jpred 3) to be almost entirely alpha-helical. These sequences show strong periodicity (consistent with long alpha helical structures) and low complexity rich in D,E,N,Q, and K. Genes encoding these proteins are often found in tandem. The function is unknown.

Pssm-ID: 275316 [Multi-domain] Cd Length: 745 Bit Score: 52.33 E-value: 2.65e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEKKLpvtfeDKKRENFERGNLELEKRRQALL---EQQRKEQERLA----QLERAEQERKERERQEQERKRQL 407
Cdd:TIGR04523  223 LKKQNNQLKDNI-----EKKQQEINEKTTEISNTQTQLNqlkDEQNKIKKQLSekqkELEQNNKKIKELEKQLNQLKSEI 297

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    408 -------------ELEKQLEKQRELERQREEERRKEIERREAAKREL---------------ERQRQLEWERNRRQELLN 459
Cdd:TIGR04523  298 sdlnnqkeqdwnkELKSELKNQEKKLEEIQNQISQNNKIISQLNEQIsqlkkeltnsesensEKQRELEEKQNEIEKLKK 377

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    460 QRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEIThlqqqlqesqqmlg 539
Cdd:TIGR04523  378 ENQSYKQEIKNLESQINDLESKIQNQEKLNQQKDEQIKKLQQEKELLEKEIERLKETIIKNNSEIK-------------- 443

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    540 RLIPEKQILNDQLKQVQQnslHRDSlvtLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREihNKQQL 619
Cdd:TIGR04523  444 DLTNQDSVKELIIKNLDN---TRES---LETQLKVLSRSINKIKQNLEQKQKELKSKEKELKKLNEEKKELEE--KVKDL 515

                          330       340       350       360       370       380
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123    620 QKQKSMEAERLKQ-----KEQERKIIELEKQKEEAQrraQERDKQWLEHVQQEDEhQRPRKLHEEEK 681
Cdd:TIGR04523  516 TKKISSLKEKIEKlesekKEKESKISDLEDELNKDD---FELKKENLEKEIDEKN-KEIEELKQTQK 578

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 45.92 E-value: 2.67e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1010 MYTYESSEQGDLTFQQGDVILVTKK---DGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd12142    5 LFDYNPVAPDELALKKGDVIEVISKeteDEGWWEGELNGRRGFFPDNFV 53

Src homology 3 domain of Apoptosis Stimulating of p53 proteins (ASPP); The ASPP family of proteins bind to important regulators of apoptosis (p53, Bcl-2, and RelA) and cell growth (APCL, PP1). They share similarity at their C-termini, where they harbor a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain. Vertebrates contain three members of the family: ASPP1, ASPP2, and iASPP. ASPP1 and ASPP2 activate the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73), while iASPP is an oncoprotein that specifically inhibits p53-induced apoptosis. The expression of ASPP proteins is altered in tumors; ASPP1 and ASPP2 are downregulated whereas iASPP is upregulated is some cancer types. ASPP proteins also bind and regulate protein phosphatase 1 (PP1), and this binding is competitive with p53 binding. The SH3 domain and the ANK repeats of ASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212741 [Multi-domain] Cd Length: 57 Bit Score: 46.22 E-value: 2.73e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKDGD----WWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11807    5 ALFDYEAENGDELSFREGDELTVLRKGDDdeteWWWARLNDKEGYVPRNLLGL 57

C-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also has roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRAP2 binds to different motifs found in substrate peptides including the typical PxxP motif in hematopoietic progenitor kinase 1 (HPK1), the RxxK motif in SLP-76 and HPK1, and the RxxxxK motif in phosphatase-like protein HD-PTP. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212883 [Multi-domain] Cd Length: 53 Bit Score: 45.97 E-value: 2.75e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVkgewVDESqtgEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11950    3 RALYDFEALEDDELGFNSGDVIEV----LDSS---NPSWWKGRLHGKLGLFPANYVA 52

Second Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the second SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213009 [Multi-domain] Cd Length: 54 Bit Score: 46.18 E-value: 2.75e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQ-DMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd12076    5 VIYPYTARDQDEINLEKGAVVEVIQKNlEGWWKIRYQGKEGWAPASYLK 53

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 45.82 E-value: 2.77e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGDWWTGTV-GDKAGVFPSNYVRL 1057
Cdd:cd11837    3 TALYPWRAKKENHLSFAKGDIITVLEQQEMWWFGELeGGEEGWFPKSYVKE 53

Predicted nucleic acid-binding protein DR0291, contains C4-type Zn-ribbon domain [General function prediction only];

Pssm-ID: 441187 [Multi-domain] Cd Length: 236 Bit Score: 50.31 E-value: 2.95e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  451 RNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEithlqqq 530
Cdd:COG1579   23 EHRLKELPAELAELEDELAALEARLEAAKTELEDLEKEIKRLELEIEEVEARIKKYEEQLGNVRNNKEYEALQ------- 95

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  531 lqesqqmlgrlipeKQIlnDQLKQvqQNSLHRDSLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKEL 610
Cdd:COG1579   96 --------------KEI--ESLKR--RISDLEDEILELMERIEELEEELAELEAELAELEAELEEKKAELDEELAELEAE 157

                        170       180
                 ....*....|....*....|....*...
gi 47717123  611 REIHNKQQLQKQKSMEAERLKQKEQERK 638
Cdd:COG1579  158 LEELEAEREELAAKIPPELLALYERIRK 185

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 1 (PACSIN1) and PACSIN 2; PACSIN 1 or Syndapin I (Synaptic dynamin-associated protein I) is expressed specifically in the brain and is localized in neurites and synaptic boutons. It binds the brain-specific proteins dynamin I, synaptojanin, synapsin I, and neural Wiskott-Aldrich syndrome protein (nWASP), and functions as a link between the cytoskeletal machinery and synaptic vesicle endocytosis. PACSIN 1 interacts with huntingtin and may be implicated in the neuropathology of Huntington's disease. PACSIN 2 or Syndapin II is expressed ubiquitously and is involved in the regulation of tubulin polymerization. It associates with Golgi membranes and forms a complex with dynamin II which is crucial in promoting vesicle formation from the trans-Golgi network. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212931 [Multi-domain] Cd Length: 56 Bit Score: 46.10 E-value: 2.98e-06

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  743 VYYRALYPFESRSHDEITIQPGDivmvkgEWVDESQTGEPGWLGGEL-KGKTGWFPANYAE 802
Cdd:cd11998    1 VRVRALYDYDGQEQDELSFKAGD------ELTKLEDEDEQGWCKGRLdSGQVGLYPANYVE 55

Domain of unknown function (DUF4670); This family of proteins is found in eukaryotes. Proteins in this family are typically between 373 and 763 amino acids in length.

Pssm-ID: 464815 [Multi-domain] Cd Length: 522 Bit Score: 51.88 E-value: 3.07e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEKKLPVTfedKKRENFERGNLELEKRRQALLEQQRKEQERLAQLE--------RAEQERKERERQEQERKRQ 406
Cdd:pfam15709  378 LELEQQRRFEEIRLR---KQRLEEERQRQEEEERKQRLQLQAAQERARQQQEEfrrklqelQRKKQQEEAERAEAEKQRQ 454

                           90       100       110       120       130       140
                   ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123    407 LELEKQLEKQrelerqreeerrKEIERREAAKRELERQRQ-LEWERNRRQELLNQRNKEQE 466
Cdd:pfam15709  455 KELEMQLAEE------------QKRLMEMAEEERLEYQRQkQEAEEKARLEAEERRQKEEE 503

C-terminal Src Homology 3 domain of Nebulin; Nebulin is a giant filamentous protein (600-900 kD) that is expressed abundantly in skeletal muscle. It binds to actin thin filaments and regulates its assembly and function. Nebulin was thought to be part of a molecular ruler complex that is critical in determining the lengths of actin thin filaments in skeletal muscle since its length, which varies due to alternative splicing, correlates with the length of thin filaments in various muscle types. Recent studies indicate that nebulin regulates thin filament length by stabilizing the filaments and preventing depolymerization. Mutations in nebulin can cause nemaline myopathy, characterized by muscle weakness which can be severe and can lead to neonatal lethality. Nebulin contains an N-terminal LIM domain, many nebulin repeats/super repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212866 [Multi-domain] Cd Length: 58 Bit Score: 46.15 E-value: 3.07e-06

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMvkgewvdESQTGEPGWLGGELK--GKTGWFPANYAEKI 804
Cdd:cd11933    4 FRAMYDYRAADDDEVSFKDGDTIV-------NVQTIDEGWMYGTVQrtGKTGMLPANYVEAI 58

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase and similar proteins; This subfamily is composed of Rho GTPase activating proteins (GAPs) with similarity to GRAF. Members contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. Although vertebrates harbor four Rho GAPs in the GRAF subfamily including GRAF, GRAF2, GRAF3, and Oligophrenin-1 (OPHN1), only three are included in this model. OPHN1 contains the BAR, PH and GAP domains, but not the C-terminal SH3 domain. GRAF and GRAF2 show GAP activity towards RhoA and Cdc42. GRAF influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase. GRAF2 regulates caspase-activated p21-activated protein kinase-2. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212815 [Multi-domain] Cd Length: 54 Bit Score: 45.75 E-value: 3.11e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVI--LVTKKDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11882    4 ALYACKAEDESELSFEPGQIItnVQPSDEPGWLEGTLNGRTGLIPENYVEF 54

Src Homology 3 domain of Apoptosis Stimulating of p53 protein 1; ASPP1, like ASPP2, activates the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73). In addition, it functions in the cytoplasm to regulate the nuclear localization of the transcriptional cofactors YAP and TAZ by inihibiting their phosphorylation; YAP and TAZ are important regulators of cell expansion, differentiation, migration, and invasion. ASPP1 is downregulated in breast tumors expressing wild-type p53. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of ASPP1 contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212887 [Multi-domain] Cd Length: 57 Bit Score: 45.78 E-value: 3.15e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK----DGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11954    5 ALWDYEAQNADELSFQEGDAITILRRkddsETEWWWARLNDKEGYVPKNLLGL 57

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 46.09 E-value: 3.35e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1081 VIASYTATGPEQLTLAPGQLILIRKKNPG-----GWWEGELQARgkkrqIGWFPANYV 1133
Cdd:cd12058    4 ALYDYEASGEDELSLRRGDVVEVLSQDAAvsgddGWWAGKIRHR-----LGIFPANYV 56

Src Homology 3 domain of the p40phox subunit of NADPH oxidase; p40phox, also called Neutrophil cytosol factor 4 (NCF-4), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p40phox positively regulates NADPH oxidase in both phosphatidylinositol-3-phosphate (PI3P)-dependent and PI3P-independent manner. It contains an N-terminal PX domain, a central SH3 domain, and a C-terminal PB1 domain that interacts with p67phox. The SH3 domain of p40phox binds to canonical polyproline and noncanonical motifs at the C-terminus of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212802 Cd Length: 54 Bit Score: 45.56 E-value: 3.43e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11869    4 ALFDFTGNSKLELNFKAGDVIfLLSRVNKDWLEGTVRGATGIFPLSFVKI 53

Uncharacterized conserved protein, contains a C-terminal ATPase domain [Function unknown];

Pssm-ID: 443941 [Multi-domain] Cd Length: 1089 Bit Score: 52.22 E-value: 3.43e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  367 KRRQALLEQQRKE-QERLAQLERAEQERKERERQEQERKRQLE-LEKQLEKQrelerqreeerrkeiERREAAKRELERQ 444
Cdd:COG4913  609 RAKLAALEAELAElEEELAEAEERLEALEAELDALQERREALQrLAEYSWDE---------------IDVASAEREIAEL 673

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  445 RQlewernRRQELLnqrnKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIEstnksRELRIAEI 524
Cdd:COG4913  674 EA------ELERLD----ASSDDLAALEEQLEELEAELEELEEELDELKGEIGRLEKELEQAEEELD-----ELQDRLEA 738

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  525 THLQQQLQESQQMLGRLipeKQILNDQLKQVQQNSLHRDslvtLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFN 604
Cdd:COG4913  739 AEDLARLELRALLEERF---AAALGDAVERELRENLEER----IDALRARLNRAEEELERAMRAFNREWPAETADLDADL 811

                        250       260       270       280       290
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  605 NQLKELREIHNkqQLQKQKSMEAE----RLKQKEQERKIIELEKQKEEAQRRAQER 656
Cdd:COG4913  812 ESLPEYLALLD--RLEEDGLPEYEerfkELLNENSIEFVADLLSKLRRAIREIKER 865

Src Homology 3 domain of Tec (Tyrosine kinase expressed in hepatocellular carcinoma); Tec is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. It is more widely-expressed than other Tec subfamily kinases. Tec is found in endothelial cells, both B- and T-cells, and a variety of myeloid cells including mast cells, erythroid cells, platelets, macrophages and neutrophils. Tec is a key component of T-cell receptor (TCR) signaling, and is important in TCR-stimulated proliferation, IL-2 production and phospholipase C-gamma1 activation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212838 [Multi-domain] Cd Length: 56 Bit Score: 45.58 E-value: 3.50e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKG-EVNGQVGLFPSNYV 1209
Cdd:cd11905    3 VVAMYDFQPTEPHDLRLETGEEYVILEKNDVHWWKArDKYGKEGYIPSNYV 53

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase 2; GRAF2, also called Rho GTPase activating protein 10 (ARHGAP10) or PS-GAP, is a GAP with activity towards Cdc42 and RhoA. It regulates caspase-activated p21-activated protein kinase-2 (PAK-2p34). GRAF2 interacts with PAK-2p34, leading to its stabilization and decrease of cell death. It is highly expressed in skeletal muscle, and is involved in alpha-catenin recruitment at cell-cell junctions. GRAF2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212998 [Multi-domain] Cd Length: 54 Bit Score: 45.75 E-value: 3.66e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1163 MYDYTAQNDDELAFNKGQII-NVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd12065    5 VYPCEAEHSSELSFEVGAIFeDVTLSREPGWLEGTLNGKRGLIPENYVEI 54

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the third SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212714 [Multi-domain] Cd Length: 55 Bit Score: 45.76 E-value: 3.82e-06

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVKgEWVDEsqtgepGWLGG--ELKGKTGWFPANYAEK 803
Cdd:cd11780    2 YRALYSYTPQNEDELELREGDIVYVM-EKCDD------GWFVGtsERTGLFGTFPGNYVAR 55

Src Homology 3 domain of the p40phox subunit of NADPH oxidase; p40phox, also called Neutrophil cytosol factor 4 (NCF-4), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p40phox positively regulates NADPH oxidase in both phosphatidylinositol-3-phosphate (PI3P)-dependent and PI3P-independent manner. It contains an N-terminal PX domain, a central SH3 domain, and a C-terminal PB1 domain that interacts with p67phox. The SH3 domain of p40phox binds to canonical polyproline and noncanonical motifs at the C-terminus of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212802 Cd Length: 54 Bit Score: 45.56 E-value: 3.85e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11869    5 LFDFTGNSKLELNFKAGDVIFLLSRVNKDWLEGTVRGATGIFPLSFVKI 53

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor 2; ASEF2, also called Spermatogenesis-associated protein 13 (SPATA13), is a GEF that localizes with actin at the leading edge of cells and is important in cell migration and adhesion dynamics. GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF2 can activate both Rac 1 and Cdc42, but only Rac1 activation is necessary for increased cell migration and adhesion turnover. Together with APC (adenomatous polyposis coli) and Neurabin2, a scaffold protein that binds F-actin, it is involved in regulating HGF-induced cell migration. ASEF2 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212907 Cd Length: 54 Bit Score: 45.44 E-value: 3.95e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTK-KDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11974    5 ALWDHVTMDDQELAFKAGDVIRVLEaSNKDWWWGRNEDREAWFPASFVRL 54

C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 2 (Stac2); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac2 contains a single SH3 domain at the C-terminus unlike Stac1 and Stac3, which contain two C-terminal SH3 domains. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212918 Cd Length: 53 Bit Score: 45.71 E-value: 4.01e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVkgewVDESQTgepGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11985    2 YVALYKFLPQENNDLPLQPGDRVMV----VDDSNE---DWWKGKSGDRVGFFPANFVQR 53

Src homology 3 domain of SH3 and multiple ankyrin repeat domains (Shank) proteins; Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. They bind a variety of membrane and cytosolic proteins, and exist in alternatively spliced isoforms. They are highly enriched in postsynaptic density (PSD) where they interact with the cytoskeleton and with postsynaptic membrane receptors including NMDA and glutamate receptors. They are crucial in the construction and organization of the PSD and dendritic spines of excitatory synapses. There are three members of this family (Shank1, Shank2, Shank3) which show distinct and cell-type specific patterns of expression. Shank1 is brain-specific; Shank2 is found in neurons, glia, endocrine cells, liver, and kidney; Shank3 is widely expressed. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212766 Cd Length: 50 Bit Score: 45.50 E-value: 4.04e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPS 1206
Cdd:cd11832    1 YFIAVKSYSPQEEGEISLHKGDRVKVLSIGEGGFWEGSVRGRTGWFPS 48

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 45.37 E-value: 4.05e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYV 966
Cdd:cd11772    4 ALYDYEAQHPDELSFEEGDLLYISDKSDPnWWKATCGGKTGLIPSNYV 51

Src homology 3 domains of Rab3-interacting molecules (RIMs) binding proteins; RIMs binding proteins (RBPs, RIM-BPs) associate with calcium channels present in photoreceptors, neurons, and hair cells; they interact simultaneously with specific calcium channel subunits, and active zone proteins, RIM1 and RIM2. RIMs are part of the matrix at the presynaptic active zone and are associated with synaptic vesicles through their interaction with the small GTPase Rab3. RIM-BPs play a role in regulating synaptic transmission by serving as adaptors and linking calcium channels with the synaptic vesicle release machinery. RIM-BPs contain three SH3 domains and two to three fibronectin III repeats. Invertebrates contain one, while vertebrates contain at least two RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called peripheral-type benzodiazapine receptor associated protein 1 (PRAX-1). Mammals contain a third protein, RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly expressed in the brain where they display overlapping but distinct expression patterns, while RIM-BP3 is almost exclusively expressed in the testis and is essential in spermiogenesis. The SH3 domains of RIM-BPs bind to the PxxP motifs of RIM1, RIM2, and L-type (alpha1D) and N-type (alpha1B) calcium channel subunits. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212785 Cd Length: 62 Bit Score: 45.77 E-value: 4.16e-06

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1160 VIGMYDY----TAQNDD---ELAFNKGQIINVLNKEDPD-WWKGEVNG-QVGLFPSNYVK 1210
Cdd:cd11851    2 MVALYDYnpetMSPNDDpeeELSFHAGDVVRVYGPMDEDgFYYGELEGgRKGLVPSNFVQ 61

C2 domain second repeat present in Synaptotagmin-like proteins 1-4; All Slp members basically share an N-terminal Slp homology domain (SHD) and C-terminal tandem C2 domains (named the C2A domain and the C2B domain) with the SHD and C2 domains being separated by a linker sequence of various length. Slp1/JFC1 and Slp2/exophilin 4 promote granule docking to the plasma membrane. Additionally, their C2A domains are both Ca2+ independent, unlike the case in Slp3 and Slp4/granuphilin in which their C2A domains are Ca2+ dependent. It is thought that SHD (except for the Slp4-SHD) functions as a specific Rab27A/B-binding domain. In addition to Slps, rabphilin, Noc2, and Munc13-4 also function as Rab27-binding proteins. It has been demonstrated that Slp3 and Slp4/granuphilin promote dense-core vesicle exocytosis. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 175987 [Multi-domain] Cd Length: 162 Bit Score: 48.47 E-value: 4.22e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTM-----GSQCHITKTIQDTLNPKWN---SNCQFFIRDLEQEVLCITVFERD 1667
Cdd:cd04020   27 GELHVWVKEAKNLPALKSGGTSDSFVKCYLlpdksKKSKQKTPVVKKSVNPVWNhtfVYDGVSPEDLSQACLELTVWDHD 106


                 ....*....
gi 47717123 1668 QFSPDDFLG 1676
Cdd:cd04020  107 KLSSNDFLG 115

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 45.31 E-value: 4.27e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGD--WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11830    3 KARYDFCARDMRELSLKEGDVVKIYNKKGQqgWWRGEINGRIGWFPSTYV 52

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 45.38 E-value: 4.43e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123  922 YPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGEVQGQKGWFPKSYV 966
Cdd:cd11902    7 FAYVAEREDELSLVKGSRVTVMEKcSDGWWRGSYNGQIGWFPSNYV 52

Src Homology 3 domain of Cytokinesis protein 3 and similar proteins; Cytokinesis protein 3 (Cyk3 or Cyk3p) is a component of the actomyosin ring independent cytokinesis pathway in yeast. It interacts with Inn1 and facilitates its recruitment to the bud neck, thereby promoting cytokinesis. Cyk3p contains an N-terminal SH3 domain and a C-terminal transglutaminase-like domain. The Cyk3p SH3 domain binds to the C-terminal proline-rich region of Inn1. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212822 Cd Length: 53 Bit Score: 45.18 E-value: 4.47e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEV--NGQVGLFPSNYV 1209
Cdd:cd11889    5 VYSWAGETEGDLGFLEGDLIEVLSIGDGSWWSGKLrrNGAEGIFPSNFV 53

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 45.40 E-value: 4.50e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELqaRGKkrqIGWFPANYVKL 1135
Cdd:cd11874    2 CKVLFSYTPQNEDELELKVGDTIEVLGEVEEGWWEGKL--NGK---VGVFPSNFVKE 53

First Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212854 Cd Length: 55 Bit Score: 45.30 E-value: 4.51e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwVDESqtgepgWLGGELKGKTGWFPANYAEKI 804
Cdd:cd11921    4 RLKFDFQAQSPKELTLQKGDIVYIHKE-VDKN------WLEGEHHGRVGIFPANYVEVL 55

Second Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the second SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212721 [Multi-domain] Cd Length: 53 Bit Score: 45.40 E-value: 4.54e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1159 QVIGMYDYTAQNDDE---LAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNY 1208
Cdd:cd11787    1 QCKALYDFEMKDEDEkdcLTFKKGDVITVIRRVDENWAEGRLGDKIGIFPISF 53

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor; ASEF, also called ARHGEF4, exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli). GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF can activate Rac1 or Cdc42. Truncated ASEF, which is found in colorectal cancers, is constitutively active and has been shown to promote angiogenesis and cancer cell migration. ASEF contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212906 [Multi-domain] Cd Length: 73 Bit Score: 46.16 E-value: 4.63e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11973   20 AEALWDHVTMDDQELGFKAGDVIEVMDATNKeWWWGRVLDSEGWFPASFVRL 71

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 45.33 E-value: 4.67e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11766    2 AVVKFNYEAQREDELSLRKGDRVLV-------LEKSSDGWWRGECNGQVGWFPSNYVTE 53

C-terminal Src Homology 3 domain of Nebulin; Nebulin is a giant filamentous protein (600-900 kD) that is expressed abundantly in skeletal muscle. It binds to actin thin filaments and regulates its assembly and function. Nebulin was thought to be part of a molecular ruler complex that is critical in determining the lengths of actin thin filaments in skeletal muscle since its length, which varies due to alternative splicing, correlates with the length of thin filaments in various muscle types. Recent studies indicate that nebulin regulates thin filament length by stabilizing the filaments and preventing depolymerization. Mutations in nebulin can cause nemaline myopathy, characterized by muscle weakness which can be severe and can lead to neonatal lethality. Nebulin contains an N-terminal LIM domain, many nebulin repeats/super repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212866 [Multi-domain] Cd Length: 58 Bit Score: 45.38 E-value: 4.83e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1004 GEEFIAMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTV--GDKAGVFPSNYV 1055
Cdd:cd11933    1 GKSFRAMYDYRAADDDEVSFKDGDTIVnVQTIDEGWMYGTVqrTGKTGMLPANYV 55

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor; ASEF, also called ARHGEF4, exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli). GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF can activate Rac1 or Cdc42. Truncated ASEF, which is found in colorectal cancers, is constitutively active and has been shown to promote angiogenesis and cancer cell migration. ASEF contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212906 [Multi-domain] Cd Length: 73 Bit Score: 45.78 E-value: 5.00e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1162 GMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11973   22 ALWDHVTMDDQELGFKAGDVIEVMDATNKEWWWGRVLDSEGWFPASFVRL 71

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 45.08 E-value: 5.03e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1078 IAQVIASYTATGPEQLTLAPGQLILIRKKNPG--GWWEGELqaRGkkrQIGWFPANYVK 1134
Cdd:cd11841    1 EVTALYSFEGQQPCDLSFQAGDRITVLTRTDSqfDWWEGRL--RG---RVGIFPANYVS 54

Pleckstrin homology (PH) domain; PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 275388 [Multi-domain] Cd Length: 92 Bit Score: 46.38 E-value: 5.07e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1465 HSGKLYK-----AKSNKELYGFLFNDFLLLTQitkplgsSGTDKVFSPKsnlqykmykTPIFLNEVLVKLPTDPSGDEPI 1539
Cdd:cd00821    1 KEGYLLKrggggLKSWKKRWFVLFEGVLLYYK-------SKKDSSYKPK---------GSIPLSGILEVEEVSPKERPHC 64

                         90       100
                 ....*....|....*....|....*...
gi 47717123 1540 FHISH-IDRVYTLRAESINERTAWVQKI 1566
Cdd:cd00821   65 FELVTpDGRTYYLQADSEEERQEWLKAL 92

Src Homology 3 domain of Bbc1 and similar domains; This subfamily is composed of Saccharomyces cerevisiae Bbc1p, also called Mti1p (Myosin tail region-interacting protein), and similar proteins. Bbc1p interacts with and regulates type I myosins in yeast, Myo3p and Myo5p, which are involved in actin cytoskeletal reorganization. It also binds and inhibits Las17, a WASp family protein that functions as an activator of the Arp2/3 complex. Bbc1p contains an N-terminal SH3 domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212820 [Multi-domain] Cd Length: 60 Bit Score: 45.41 E-value: 5.20e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQG-----QKGWFPKSYV 966
Cdd:cd11887    6 ALYPYESDHEDDLNFDVGQLITVTEEEDAdWYFGEYVDsngntKEGIFPKNFV 58

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212850 [Multi-domain] Cd Length: 61 Bit Score: 45.37 E-value: 5.33e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQ--VGLFPSNYVK 1210
Cdd:cd11917   10 LYNYMPRNEDELELREGDVIDVMEKCDDGWFVGTSRRTkfFGTFPGNYVK 59

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 45.19 E-value: 5.80e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVKgewvdeSQTGEPGWLGGELKGKTGWFPANY 800
Cdd:cd11812    4 ALYDYTANRSDELTIHRGDIIRVL------YKDNDNWWFGSLVNGQQGYFPANY 51

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 45.00 E-value: 5.81e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  916 LQAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQKGWFPKSYVKLI 969
Cdd:cd11920    1 LPARAVYDFKAQTSKELSFKKGDTVYILRKIDQNWYeGEHHGRVGIFPISYVEKL 55

Src homology 3 domain of Phospholipase C (PLC) gamma 2; PLCgamma2 is primarily expressed in haematopoietic cells, specifically in B cells. It is activated by tyrosine phosphorylation by B cell receptor (BCR) kinases and is recruited to the plasma membrane where its substrate is located. It is required in pre-BCR signaling and in the maturation of B cells. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212902 Cd Length: 55 Bit Score: 45.21 E-value: 5.87e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1085 YTATGPEQLTLAPGQLILIRKKNPGGWWEGELqarGKKRQIgWFPANYVK 1134
Cdd:cd11969    8 YRAKRSDELSFCKGALIHNVSKETGGWWKGDY---GGKVQH-YFPSNYVE 53

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 45.27 E-value: 5.90e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1080 QVIASYTATGPEQLTLAPGQLILIRKKN--PGGWWEGELQARGkkrqiGWFPANYVKLL 1136
Cdd:cd12057    3 KVLFPYEAQNEDELTIKEGDIVTLISKDciDAGWWEGELNGRR-----GVFPDNFVKLL 56

C2 domain third repeat present in Tricalbin-like proteins; 5 to 6 copies of the C2 domain are present in Tricalbin, a yeast homolog of Synaptotagmin, which is involved in membrane trafficking and sorting. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the third C2 repeat, C2C, and has a type-II topology.

Pssm-ID: 176010 [Multi-domain] Cd Length: 120 Bit Score: 47.20 E-value: 6.06e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1615 GKSNPYCEVTM-GSQCHITKTIQDTLNPKWNsNCQFFIRDLEQEVLCITVFERDQFSPDDFLGRTEIRVAD-IKKDQ--- 1689
Cdd:cd04045   20 GKIDPYVRVLVnGIVKGRTVTISNTLNPVWD-EVLYVPVTSPNQKITLEVMDYEKVGKDRSLGSVEINVSDlIKKNEdgk 98

                         90
                 ....*....|....*.
gi 47717123 1690 ----GSKGPVTKCLLL 1701
Cdd:cd04045   99 yveyDDEEERLKRLLS 114

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. Also included in this subfamily is the second C-terminal SH3 domain of Rho guanine nucleotide exchange factor 37 (ARHGEF37), whose function is still unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212734 [Multi-domain] Cd Length: 57 Bit Score: 45.06 E-value: 6.20e-06

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKgEWVDesQTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11800    1 YYYALYTFEARSPGELSVTEGQVVTVL-EKHD--LKGNPEWWLVEDRGKQGYVPSNYLAK 57

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 45.00 E-value: 6.27e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVKGEWvdesqTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11977    5 ARYNFAARDMRELSLREGDVVRIYSRI-----GGDQGWWKGETNGRIGWFPSTYVEE 56

First Src homology 3 domain (or SH3A) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212770 [Multi-domain] Cd Length: 55 Bit Score: 45.04 E-value: 6.31e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1080 QVIASYTATGPEQLTLAPGQLILIRKKN--PGGWWEGELqaRGKkrqIGWFPANYV 1133
Cdd:cd11836    3 RALYAFEARNPDEISFQPGDIIQVDESQvaEPGWLAGEL--KGK---TGWFPANYV 53

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 44.79 E-value: 6.38e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd12046    1 QVVALFSYEASQPEDLEFQKGDVILVLSKvNEDWLEGQCKGKIGIFPSAFVE 52

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 44.99 E-value: 6.50e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  916 LQAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVK 967
Cdd:cd12060    2 LVVKARFNFKQTNEDELSVCKGDIIYVTRVEEGgWWEGTLNGKTGWFPSNYVR 54

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 45.02 E-value: 6.52e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1008 IAMYTYESSEQgdLTFQQGDVILVTKKDGD-WWTGTV---GDK--AGVFPSNYVRL 1057
Cdd:cd11839    5 IAPFTATAENQ--LSLAVGQLVLVRKKSPSgWWEGELqarGKKrqIGWFPANYVKL 58

C2 domain in Munc13 (mammalian uncoordinated) proteins; fungal group; C2-like domains are thought to be involved in phospholipid binding in a Ca2+ independent manner in both Unc13 and Munc13. Caenorabditis elegans Unc13 has a central domain with sequence similarity to PKC, which includes C1 and C2-related domains. Unc13 binds phorbol esters and DAG with high affinity in a phospholipid manner. Mutations in Unc13 results in abnormal neuronal connections and impairment in cholinergic neurotransmission in the nematode. Munc13 is the mammalian homolog which are expressed in the brain. There are 3 isoforms (Munc13-1, -2, -3) and are thought to play a role in neurotransmitter release and are hypothesized to be high-affinity receptors for phorbol esters. Unc13 and Munc13 contain both C1 and C2 domains. There are two C2 related domains present, one central and one at the carboxyl end. Munc13-1 contains a third C2-like domain. Munc13 interacts with syntaxin, synaptobrevin, and synaptotagmin suggesting a role for these as scaffolding proteins. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 176008 [Multi-domain] Cd Length: 126 Bit Score: 47.26 E-value: 6.72e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1600 VNVVEGIELKPCRSHGKSNPYceVTM-----GSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQFSPDDF 1674
Cdd:cd04043    5 IRIVRAENLKADSSNGLSDPY--VTLvdtngKRRIAKTRTIYDTLNPRWDEEFELEVPAGEPLWISATVWDRSFVGKHDL 82


                 ....*..
gi 47717123 1675 LGRTEIR 1681
Cdd:cd04043   83 CGRASLK 89

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 51.30 E-value: 6.87e-06

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   307 SFRRVRSGSGISVISSTSVDQRLPEEPVLEDEQQQLEKKLPVTFEDKKRENFERGNLELEKRRQAllEQQRKEQerlaQL 386
Cdd:PTZ00121 1579 ALRKAEEAKKAEEARIEEVMKLYEEEKKMKAEEAKKAEEAKIKAEELKKAEEEKKKVEQLKKKEA--EEKKKAE----EL 1652

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   387 ERAEQERKERerQEQERKRQlELEKQLEKQRELERQREEERRKEIERREAAKRELERQRQLEWERNRRQELLnQRNKEQE 466
Cdd:PTZ00121 1653 KKAEEENKIK--AAEEAKKA-EEDKKKAEEAKKAEEDEKKAAEALKKEAEEAKKAEELKKKEAEEKKKAEEL-KKAEEEN 1728

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   467 DIVVLKAKKKTLEFELEALNDKKHqlEGKLQDIRCRLTTQRQEIESTNKSRELRIAEithlqqqLQESQQMLGRLIPEKQ 546
Cdd:PTZ00121 1729 KIKAEEAKKEAEEDKKKAEEAKKD--EEEKKKIAHLKKEEEKKAEEIRKEKEAVIEE-------ELDEEDEKRRMEVDKK 1799

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   547 I--LNDQLKQVQQNSLHRDSLVTLKRAL---EAKELA--RQHLRDQLDEVEKETRSK--------------LQEIDIFNN 605
Cdd:PTZ00121 1800 IkdIFDNFANIIEGGKEGNLVINDSKEMedsAIKEVAdsKNMQLEEADAFEKHKFNKnnengedgnkeadfNKEKDLKED 1879

                         330       340       350       360       370       380
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 47717123   606 QLKELREIHNKQQLQKQkSMEAERLKQ--KEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQED 668
Cdd:PTZ00121 1880 DEEEIEEADEIEKIDKD-DIEREIPNNnmAGKNNDIIDDKLDKDEYIKRDAEETREEIIKISKKD 1943

Third Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212750 [Multi-domain] Cd Length: 51 Bit Score: 44.71 E-value: 7.24e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKgEWVDESqtgepgWLGGELKGKTGWFPANY 800
Cdd:cd11816    3 VARFDFEGEQEDELSFSEGDVITLK-EYVGEE------WAKGELNGKIGIFPLNF 50

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 44.70 E-value: 7.64e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQ-----DMWWFGEVQGQKGWFP 962
Cdd:cd11762    2 VRALYDYEAQSDEELSFPEGAIIRILRKDdngvdDGWWEGEFNGRVGVFP 51

Fourth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212751 [Multi-domain] Cd Length: 50 Bit Score: 44.78 E-value: 7.71e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSY 965
Cdd:cd11817    2 AVALYDFTGETEEDLSFQRGDRILVTEHLDAeWSRGRLNGREGIFPRAF 50

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 1; Shank1, also called SSTRIP (Somatostatin receptor-interacting protein), is a brain-specific protein that plays a role in the construction of postsynaptic density (PSD) and the maturation of dendritic spines. Mice deficient in Shank1 show altered PSD composition, thinner PSDs, smaller dendritic spines, and weaker basal synaptic transmission, although synaptic plasticity is normal. They show increased anxiety and impaired fear memory, but also show better spatial learning. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212915 [Multi-domain] Cd Length: 52 Bit Score: 44.62 E-value: 7.73e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....
gi 47717123 1166 YTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11982    9 YQSQAEGEISLSKGEKIKVLSVGEGGFWEGQVKGRVGWFPSDCV 52

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 44.81 E-value: 7.75e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1085 YTATGPEQLTLAPGQLILIRKKNPG-----GWWEGELQARgkkrqIGWFPANYV 1133
Cdd:cd11876    8 YDARGEDELTLRRGQPVEVLSKDAAvsgdeGWWTGKIGDK-----VGIFPSNYV 56

Arginine and glutamate-rich 1; ARGLU, arginine and glutamate-rich 1 protein family, is required for the oestrogen-dependent expression of ESR1 target genes. It functions in cooperation with MED1. The family of proteins is found in eukaryotes.

Pssm-ID: 405931 [Multi-domain] Cd Length: 151 Bit Score: 47.35 E-value: 8.01e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    325 VDQRLPEEpvLEDEQQQLEKKLPVTFEDKKRENFERGNLELEKRRQALL-EQQRKEQERLAQLERAEQERKERERQEQER 403
Cdd:pfam15346   20 VAKRVEEE--LEKRKDEIEAEVERRVEEARKIMEKQVLEELEREREAELeEERRKEEEERKKREELERILEENNRKIEEA 97

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    404 KRQLELEKQlekqrelerqreeerrkeierreaakRELERQRQLEWERNRRQELLNQRNKEQEDIVVLKAK-KKTLEFEL 482
Cdd:pfam15346   98 QRKEAEERL--------------------------AMLEEQRRMKEERQRREKEEEEREKREQQKILNKKNsRPKLSFSL 151

Pleckstrin homology domain-containing family G member 5 and 6 pleckstrin homology (PH) domain; PLEKHG5 has a RhoGEF DH/double-homology domain in tandem with a PH domain which is involved in phospholipid binding. PLEKHG5 activates the nuclear factor kappa B (NFKB1) signaling pathway. Mutations in PLEKHG5 are associated with autosomal recessive distal spinal muscular atrophy. PLEKHG6 (also called MyoGEF) has no known function to date. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 270064 Cd Length: 100 Bit Score: 46.07 E-value: 8.09e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1461 RKFLHSG--KLYKAKSNK-ELYGFLFNDFLLltqITKPLGSSGtDKvfspksnlqYKMYKTPIFLNEVLVKLPTDPSGde 1537
Cdd:cd13244    1 RRLLLEGdlRLKEGKGSKvDVHCFLFTDMLL---ICKPVKRKK-DR---------LKVIRPPYLVDKLVVQELKDPGG-- 65

                         90       100       110
                 ....*....|....*....|....*....|....*.
gi 47717123 1538 piFHISHIDR------VYTLRAESINERTAWVQKIK 1567
Cdd:cd13244   66 --FLLVYLNEfhtavaAYTFQTSSQEDTRRWLDAIR 99

Third Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212717 [Multi-domain] Cd Length: 55 Bit Score: 44.69 E-value: 8.34e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTKK--DGdWWTGT--VGDKAGVFPSNYV 1055
Cdd:cd11783    2 YVALYPYKPQKPDELELRKGEMYTVTEKcqDG-WFKGTslRTGQSGVFPGNYV 53

First C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212895 [Multi-domain] Cd Length: 54 Bit Score: 44.79 E-value: 8.48e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGE-VQGQKGWFPKSYVKL 968
Cdd:cd11962    2 AVVLYDYEKDEDNEIELVEGEIVTNIEMVDEdWWMGTnSKGESGLFPSNYVEL 54

C2 domain in Protein Kinase C (PKC) alpha and gamma; A single C2 domain is found in PKC alpha and gamma. The PKC family of serine/threonine kinases regulates apoptosis, proliferation, migration, motility, chemo-resistance, and differentiation. There are 3 groups: group 1(alpha, betaI, beta II, gamma) which require phospholipids and calcium, group 2 (delta, epsilon, theta, eta) which do not require calcium for activation, and group 3 (xi, iota/lambda) which are atypical and can be activated in the absence of diacylglycerol and calcium. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members here have a type-I topology.

Pssm-ID: 175992 [Multi-domain] Cd Length: 131 Bit Score: 46.87 E-value: 8.65e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTM-----GSQCHITKTIQDTLNPKWNSncQFFIrDLEQE----VLCITVFER 1666
Cdd:cd04026   13 NKLTVEVREAKNLIPMDPNGLSDPYVKLKLipdpkNETKQKTKTIKKTLNPVWNE--TFTF-DLKPAdkdrRLSIEVWDW 89

                         90       100
                 ....*....|....*....|...
gi 47717123 1667 DQFSPDDFLGRTEIRVADIKKDQ 1689
Cdd:cd04026   90 DRTTRNDFMGSLSFGVSELIKMP 112

C2 domain second repeat found in Multiple C2 domain and Transmembrane region Proteins (MCTP); plant subset; MCTPs are involved in Ca2+ signaling at the membrane. Plant-MCTPs are composed of a variable N-terminal sequence, four C2 domains, two transmembrane regions (TMRs), and a short C-terminal sequence. It is one of four protein classes that are anchored to membranes via a transmembrane region; the others being synaptotagmins, extended synaptotagmins, and ferlins. MCTPs are the only membrane-bound C2 domain proteins that contain two functional TMRs. MCTPs are unique in that they bind Ca2+ but not phospholipids. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 176024 [Multi-domain] Cd Length: 121 Bit Score: 46.54 E-value: 8.72e-06

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1597 RLMVNVVEGIELKPCrshgKSNPYCEVTMGSQCHITKTIQDTLNPKWNsncQFFI--RDLEQE-VLCITVFERDqFSPDD 1673
Cdd:cd08378    1 YLYVRVVKARGLPAN----SNDPVVEVKLGNYKGSTKAIERTSNPEWN---QVFAfsKDRLQGsTLEVSVWDKD-KAKDD 72

                         90
                 ....*....|..
gi 47717123 1674 FLGRTEIRVADI 1685
Cdd:cd08378   73 FLGGVCFDLSEV 84

First C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212895 [Multi-domain] Cd Length: 54 Bit Score: 44.40 E-value: 8.91e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTVGD-KAGVFPSNYVRL 1057
Cdd:cd11962    3 VVLYDYEKDEDNEIELVEGEIVTnIEMVDEDWWMGTNSKgESGLFPSNYVEL 54

Third Src homology 3 domain of Rab3-interacting molecules (RIMs) binding proteins; RIMs binding proteins (RBPs, RIM-BPs) associate with calcium channels present in photoreceptors, neurons, and hair cells; they interact simultaneously with specific calcium channel subunits, and active zone proteins, RIM1 and RIM2. RIMs are part of the matrix at the presynaptic active zone and are associated with synaptic vesicles through their interaction with the small GTPase Rab3. RIM-BPs play a role in regulating synaptic transmission by serving as adaptors and linking calcium channels with the synaptic vesicle release machinery. RIM-BPs contain three SH3 domains and two to three fibronectin III repeats. Invertebrates contain one, while vertebrates contain at least two RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called peripheral-type benzodiazapine receptor associated protein 1 (PRAX-1). Mammals contain a third protein, RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly expressed in the brain where they display overlapping but distinct expression patterns, while RIM-BP3 is almost exclusively expressed in the testis and is essential in spermiogenesis. The SH3 domains of RIM-BPs bind to the PxxP motifs of RIM1, RIM2, and L-type (alpha1D) and N-type (alpha1B) calcium channel subunits. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212946 Cd Length: 61 Bit Score: 44.68 E-value: 9.38e-06

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1159 QVIGMYDYTAQ----NDD---ELAFNKGQIINVLNKEDPD-WWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12013    1 RMVALFDYDPResspNVDaevELSFRAGDIITVFGEMDEDgFYYGELNGQRGLVPSNFLE 60

Src homology 3 domain of Lyn Protein Tyrosine Kinase; Lyn is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lyn is expressed in B lymphocytes and myeloid cells. It exhibits both positive and negative regulatory roles in B cell receptor (BCR) signaling. Lyn, as well as Fyn and Blk, promotes B cell activation by phosphorylating ITAMs (immunoreceptor tyr activation motifs) in CD19 and in Ig components of BCR. It negatively regulates signaling by its unique ability to phosphorylate ITIMs (immunoreceptor tyr inhibition motifs) in cell surface receptors like CD22 and CD5. Lyn also plays an important role in G-CSF receptor signaling by phosphorylating a variety of adaptor molecules. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212937 [Multi-domain] Cd Length: 56 Bit Score: 44.60 E-value: 9.39e-06

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGDWWTGT--VGDKAGVFPSNYV 1055
Cdd:cd12004    3 VALYPYDGIHEDDLSFKKGEKLKVIEEHGEWWKARslTTKKEGFIPSNYV 52

Second Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the second SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212949 Cd Length: 54 Bit Score: 44.37 E-value: 9.85e-06

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123  922 YPWRAKKDNHLNFNKNDVITVLEQQ-DMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd12016    7 QAYKAENEDEIGFETGVVVEVIQKNlDGWWKIRYQGKEGWAPATYLK 53

Uncharacterized conserved protein, contains a C-terminal ATPase domain [Function unknown];

Pssm-ID: 443941 [Multi-domain] Cd Length: 1089 Bit Score: 50.68 E-value: 1.00e-05

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  366 EKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELE---------KQLEKQrelerqreeerrkeierREA 436
Cdd:COG4913  287 QRRLELLEAELEELRAELARLEAELERLEARLDALREELDELEAQirgnggdrlEQLERE-----------------IER 349

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  437 AKRELERQRQlewERNRRQELLNQ----RNKEQEDIVVLKAK----KKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQ 508
Cdd:COG4913  350 LERELEERER---RRARLEALLAAlglpLPASAEEFAALRAEaaalLEALEEELEALEEALAEAEAALRDLRRELRELEA 426


                 ....
gi 47717123  509 EIES 512
Cdd:COG4913  427 EIAS 430

C2 domain fourth repeat in Ferlin; Ferlins are involved in vesicle fusion events. Ferlins and other proteins, such as Synaptotagmins, are implicated in facilitating the fusion process when cell membranes fuse together. There are six known human Ferlins: Dysferlin (Fer1L1), Otoferlin (Fer1L2), Myoferlin (Fer1L3), Fer1L4, Fer1L5, and Fer1L6. Defects in these genes can lead to a wide range of diseases including muscular dystrophy (dysferlin), deafness (otoferlin), and infertility (fer-1, fertilization factor-1). Structurally they have 6 tandem C2 domains, designated as (C2A-C2F) and a single C-terminal transmembrane domain, though there is a new study that disputes this and claims that there are actually 7 tandem C2 domains with another C2 domain inserted between C2D and C2E. In a subset of them (Dysferlin, Myoferlin, and Fer1) there is an additional conserved domain called DysF. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the fourth C2 repeat, C2D, and has a type-II topology.

Pssm-ID: 175984 [Multi-domain] Cd Length: 135 Bit Score: 46.77 E-value: 1.16e-05

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1615 GKSNPYCEVTMGSQCHITKTIQDTLNPKWNsncQFFI----------RDLEQE--VLCITVFERDQFSPDDFLGRTEIR 1681
Cdd:cd04017   20 GLSDPFARVSFLNQSQETEVIKETLSPTWD---QTLIfdevelygspEEIAQNppLVVVELFDQDSVGKDEFLGRSVAK 95

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 44.16 E-value: 1.22e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVK 967
Cdd:cd11856    4 AIADYEAQGDDEISLQEGEVVEVLEKNDSgWWYVRKGDKEGWVPASYLE 52

Src Homology 3 domain of Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2-Like 1, also called Insulin Receptor Tyrosine Kinase Substrate (IRTKS); BAIAP2L1 or IRTKS is widely expressed, serves as a substrate for the insulin receptor, and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. BAIAP2L1 expression leads to the formation of short actin bundles, distinct from filopodia-like protrusions induced by the expression of the related protein IRSp53. IRTKS mediates the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. It contains an N-terminal IMD or Inverse-Bin/Amphiphysin/Rvs (I-BAR) domain, an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The SH3 domain of IRTKS has been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212846 Cd Length: 58 Bit Score: 44.14 E-value: 1.26e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|.
gi 47717123  932 LNFNKNDVITVL--EQQDMWWFGE--VQGQKGWFPKSYVKL 968
Cdd:cd11913   18 LSFAQGDVITLLipEEKDGWLYGEhdTTKARGWFPSSYTRP 58

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 44.16 E-value: 1.28e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1085 YTATGPEQLTLAPGQLILI-RKKNPGGWWEGELQARgkkrqIGWFPANYVK 1134
Cdd:cd11830    8 FCARDMRELSLKEGDVVKIyNKKGQQGWWRGEINGR-----IGWFPSTYVE 53

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 43.92 E-value: 1.32e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1081 VIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQarGKKrqiGWFPANYV 1133
Cdd:cd11806    4 AIADFVATDDSQLSFESGDKLLVLRKPSVDWWWAEHN--GCC---GYIPASHL 51

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 44.19 E-value: 1.34e-05

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1079 AQVIASYTATGPE-QLTLAPGQLILIRKK-----NPGGWWEGelqaRGKKRQIGWFPANYV 1133
Cdd:cd11771    2 CRALYDFTPENPEmELSLKKGDIVAVLSKtdplgRDSEWWKG----RTRDGRIGWFPSNYV 58

Third Src Homology 3 domain of SH3 domain containing ring finger 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212859 [Multi-domain] Cd Length: 55 Bit Score: 44.19 E-value: 1.35e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEV--NGQVGLFPSNYV 1209
Cdd:cd11926    3 VAIYPYTPRKEDELELRKGEMFLVFERCQDGWFKGTSmhTSKIGVFPGNYV 53

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase 3; GRAF3 is also called Rho GTPase activating protein 42 (ARHGAP42) or ARHGAP10-like. Though its function has not been characterized, it may be a GAP with activity towards RhoA and Cdc42, based on its similarity to GRAF and GRAF2. It contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212999 Cd Length: 55 Bit Score: 43.90 E-value: 1.41e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQII-NVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd12066    1 QAKAMYSCKAEHSHELSFPQGAIFsNVYPSVEPGWLKATYEGKTGLVPENYV 52

Third Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212750 [Multi-domain] Cd Length: 51 Bit Score: 43.94 E-value: 1.44e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11816    3 VARFDFEGEQEDELSFSEGDVITLKEYVGEeWAKGELNGKIGIFPLNFV 51

First Src homology 3 domain (or SH3A) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212920 [Multi-domain] Cd Length: 55 Bit Score: 43.83 E-value: 1.45e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1162 GMYDYTAQNDDELAFNKGQIINVLNKE--DPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11987    4 ALYPFEARSHDEITIQPGDIVMVDESQtgEPGWLGGELKGKTGWFPANYAE 54

Src homology 3 domain of Abl Interactor 1; Abi1, also called e3B1, is a central regulator of actin cytoskeletal reorganization through interactions with many protein complexes. It is part of WAVE, a nucleation-promoting factor complex, that links Rac 1 activation to actin polymerization causing lamellipodia protrusion at the plasma membrane. Abi1 interact with formins to promote protrusions at the leading edge of motile cells. It also is a target of alpha4 integrin, regulating membrane protrusions at sites of integrin engagement. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212904 [Multi-domain] Cd Length: 59 Bit Score: 44.24 E-value: 1.45e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11971    3 VAIYDYSKDKDDELSFMEGAIIYVIKKNDDgWYEGVCNGVTGLFPGNYV 51

Src homology 3 domain of Lyn Protein Tyrosine Kinase; Lyn is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lyn is expressed in B lymphocytes and myeloid cells. It exhibits both positive and negative regulatory roles in B cell receptor (BCR) signaling. Lyn, as well as Fyn and Blk, promotes B cell activation by phosphorylating ITAMs (immunoreceptor tyr activation motifs) in CD19 and in Ig components of BCR. It negatively regulates signaling by its unique ability to phosphorylate ITIMs (immunoreceptor tyr inhibition motifs) in cell surface receptors like CD22 and CD5. Lyn also plays an important role in G-CSF receptor signaling by phosphorylating a variety of adaptor molecules. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212937 [Multi-domain] Cd Length: 56 Bit Score: 44.21 E-value: 1.47e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLnKEDPDWWKGE--VNGQVGLFPSNYV 1209
Cdd:cd12004    2 VVALYPYDGIHEDDLSFKKGEKLKVI-EEHGEWWKARslTTKKEGFIPSNYV 52

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 43.79 E-value: 1.51e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVIT-VLEQQDMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd11873    4 VEFDYDAEEPDELTLKVGDIITnVKKMEEGWWEGTLNGKRGMFPDNFVK 52

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 43.87 E-value: 1.54e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  916 LQAQALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGEVQGQKGWFPKSYV 966
Cdd:cd11901    2 LPAYVKFNYTAEREDELSLVKGTKVIVMEKcSDGWWRGSYNGQVGWFPSNYV 53

Src Homology 3 domain of Sorting Nexin 33; SNX33 interacts with Wiskott-Aldrich syndrome protein (WASP) and plays a role in the maintenance of cell shape and cell cycle progression. It modulates the shedding and endocytosis of cellular prion protein (PrP(c)) and amyloid precursor protein (APP). SNXs are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNX33 also contains BAR and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212829 [Multi-domain] Cd Length: 55 Bit Score: 43.80 E-value: 1.54e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  746 RALYPFESRSHDEITIQPGDivmvkgEWVDESQTGEPGWLGGE-LKGKTGWFPANYAE 802
Cdd:cd11896    3 RALYSFQSENKEEINIQENE------ELVIFSENSLDGWLQGQnSRGETGLFPASYVE 54

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 44.21 E-value: 1.55e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTVGDKAGV-FPSNYV 1055
Cdd:cd11970    8 ALFDYKAQREDELTFTKNAIIQnVEKQEGGWWRGDYGGKKQLwFPSNYV 56

Src homology 3 domain of Endophilin-B; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain two endophilin-B isoforms. Endophilin-B proteins are cytoplasmic proteins expressed mainly in the heart, placenta, and skeletal muscle. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212736 [Multi-domain] Cd Length: 52 Bit Score: 43.82 E-value: 1.56e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM---WWFGEVQGQKGWFPKSY 965
Cdd:cd11802    1 KARVLYDYDAEDSTELSLLADEVITVYELPGMdedYMMGERGSQRGKVPVAY 52

C-terminal Src Homology 3 domain of NADPH oxidase activator 1; Noxa1 is a homolog of p67phox and is a cytosolic subunit of the nonphagocytic NADPH oxidase complex Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Noxa1 is co-expressed with Nox1 in colon, stomach, uterus, prostate, and vascular smooth muscle cells, consistent with its regulatory role. It does not interact with p40phox, unlike p67phox, making Nox1 activity independent of p40phox, unlike Nox2. Noxa1 contains TPR, PB1, and C-terminal SH3 domains, but lacks the central SH3 domain that is present in p67phox. The TPR domain binds activated GTP-bound Rac. The C-terminal SH3 domain binds the polyproline motif found at the C-terminus of Noxo1, a homolog of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212980 Cd Length: 53 Bit Score: 43.65 E-value: 1.57e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd12047    3 VAQHDYSAQGPEDLEFSQGDTIdILSEVNQEWLEGHCDGRIGIFPKCFA 51

DNA double-strand break repair Rad50 ATPase;

Pssm-ID: 179385 [Multi-domain] Cd Length: 880 Bit Score: 50.04 E-value: 1.62e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   326 DQRLPEEPVLEDEQQQLEkklpvtfeDKKRENFERGNLELEKRRQALlEQQRKEQErlAQLERAEQERkereRQEQERKR 405
Cdd:PRK02224  173 DARLGVERVLSDQRGSLD--------QLKAQIEEKEEKDLHERLNGL-ESELAELD--EEIERYEEQR----EQARETRD 237

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   406 QLE--LEKQLEKQrelerQREEERRKEIERREAAKRELERQR-----QLEWERNRRQELLNQRNKEQEDIVVLKAKKKTL 478
Cdd:PRK02224  238 EADevLEEHEERR-----EELETLEAEIEDLRETIAETEREReelaeEVRDLRERLEELEEERDDLLAEAGLDDADAEAV 312

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   479 EFELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKS---RELRIAEITHLQQQLQESQQMLGRLIPEKQ----ILNDQ 551
Cdd:PRK02224  313 EARREELEDRDEELRDRLEECRVAAQAHNEEAESLREDaddLEERAEELREEAAELESELEEAREAVEDRReeieELEEE 392

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   552 LKQVQQNslHRDSLVTLKRALEAKELARQHlRDQLDEVEKETRSKLQEIDIFNNQLKELREIHN----KQQL-------- 619
Cdd:PRK02224  393 IEELRER--FGDAPVDLGNAEDFLEELREE-RDELREREAELEATLRTARERVEEAEALLEAGKcpecGQPVegsphvet 469

                         330       340       350       360       370       380       390
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123   620 -----QKQKSMEAERLKQKEQ----ERKIIELEKQKEEAQRRaqERDKQWLEHVQQEDEHQRPRKlhEEEKLKREE 686
Cdd:PRK02224  470 ieedrERVEELEAELEDLEEEveevEERLERAEDLVEAEDRI--ERLEERREDLEELIAERRETI--EEKRERAEE 541

Synaptonemal complex protein 1 (SCP-1); Synaptonemal complex protein 1 (SCP-1) is the major component of the transverse filaments of the synaptonemal complex. Synaptonemal complexes are structures that are formed between homologous chromosomes during meiotic prophase.

Pssm-ID: 114219 [Multi-domain] Cd Length: 787 Bit Score: 49.72 E-value: 1.63e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEK-KLPVTFEDKKRENFERGNLEL-EKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERK-------- 404
Cdd:pfam05483   83 LYKEAEKIKKwKVSIEAELKQKENKLQENRKIiEAQRKAIQELQFENEKVSLKLEEEIQENKDLIKENNATRhlcnllke 162

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    405 ---RQLELEKQLEKQRELERQREEERRKEIERREAAKRELERQRQ---------LEWERNRRQELLNQRNKE---QEDIV 469
Cdd:pfam05483  163 tcaRSAEKTKKYEYEREETRQVYMDLNNNIEKMILAFEELRVQAEnarlemhfkLKEDHEKIQHLEEEYKKEindKEKQV 242

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    470 VL--------KAKKKTLEFELEALNDKKHQLE--GKLQDIRCRLTTQRQ-----EIESTNKSRELRIAEITHLQQQLQES 534
Cdd:pfam05483  243 SLlliqitekENKMKDLTFLLEESRDKANQLEekTKLQDENLKELIEKKdhltkELEDIKMSLQRSMSTQKALEEDLQIA 322

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    535 QQMLGRLIPEKQILNDQLKQVQQN-----SLHRDSLVTLKRALEAKELARQHLRDQLD----EVEKETrSKLQEIDIFNN 605
Cdd:pfam05483  323 TKTICQLTEEKEAQMEELNKAKAAhsfvvTEFEATTCSLEELLRTEQQRLEKNEDQLKiitmELQKKS-SELEEMTKFKN 401

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    606 ----QLKELREIHNKQQ--LQKQKSME--AERLKQKEQERKIIELEKQKE----EAQRRAQERDKQwleHVQQEDEHQRP 673
Cdd:pfam05483  402 nkevELEELKKILAEDEklLDEKKQFEkiAEELKGKEQELIFLLQAREKEihdlEIQLTAIKTSEE---HYLKEVEDLKT 478

                          410       420       430       440
                   ....*....|....*....|....*....|....*....|....*
gi 47717123    674 RKlhEEEKLKREE----SVKKKDGEEKGKQEAQDKLGRLfHQHQE 714
Cdd:pfam05483  479 EL--EKEKLKNIEltahCDKLLLENKELTQEASDMTLEL-KKHQE 520

Src homology 3 domain of the Rho guanine nucleotide exchange factor ARHGEF9; ARHGEF9, also called PEM2 or collybistin, selectively activates Cdc42 by exchanging bound GDP for free GTP. It is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. Mutations in the ARHGEF9 gene cause X-linked mental retardation with associated features like seizures, hyper-anxiety, aggressive behavior, and sensory hyperarousal. ARHGEF9 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212908 Cd Length: 62 Bit Score: 43.93 E-value: 1.66e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  916 LQAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11975    5 VSAEAVWDHVTMANRELAFKAGDVIKVLDASNKdWWWGQIDDEEGWFPASFVRL 58

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. Its N-terminal SH3 domain binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212879 [Multi-domain] Cd Length: 56 Bit Score: 43.86 E-value: 1.74e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  916 LQAQALYPWRAKKDNHLNFNKNDVITVL--EQQDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11946    1 MEAIAKYDFKATADDELSFKRGDILKVLneECDQNWYKAELNGKDGFIPKNYIEM 55

DNA double-strand break repair Rad50 ATPase;

Pssm-ID: 179385 [Multi-domain] Cd Length: 880 Bit Score: 49.65 E-value: 1.74e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   350 FEDKKRENFERGNLELEKRRQALleQQRKEQERLAQ---LERAEQERKE----RERQEQERKRQLELEKQLEKQRELERQ 422
Cdd:PRK02224  304 LDDADAEAVEARREELEDRDEEL--RDRLEECRVAAqahNEEAESLREDaddlEERAEELREEAAELESELEEAREAVED 381

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   423 REEERRKEIERREAAKRELE-RQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLE---FELEALNDkkhqlEGKL-- 496
Cdd:PRK02224  382 RREEIEELEEEIEELRERFGdAPVDLGNAEDFLEELREERDELREREAELEATLRTARervEEAEALLE-----AGKCpe 456

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   497 --QDIR----------CR-----LTTQRQEIESTNKSRELRIAEITHLQQQlqesqqmlgrlipEKQIlnDQLKQVQQNS 559
Cdd:PRK02224  457 cgQPVEgsphvetieeDRerveeLEAELEDLEEEVEEVEERLERAEDLVEA-------------EDRI--ERLEERREDL 521

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   560 lhrDSLVTLKRA-LEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREihNKQQLQKQKSMEAERLKQKEQERK 638
Cdd:PRK02224  522 ---EELIAERREtIEEKRERAEELRERAAELEAEAEEKREAAAEAEEEAEEARE--EVAELNSKLAELKERIESLERIRT 596

                         330       340       350       360
                  ....*....|....*....|....*....|....*....|....*..
gi 47717123   639 IIELEKQKEEAQRRAQERDKQWlehvqQEDEHQRPRKLHEEEKLKRE 685
Cdd:PRK02224  597 LLAAIADAEDEIERLREKREAL-----AELNDERRERLAEKRERKRE 638

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 43.86 E-value: 1.76e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQ--DMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd11978    3 AIARYDFCARDMRELSLLKGDVVKIYTKMstNGWWRGEVNGRVGWFPSTYVE 54

phosphodiesterase; Provisional

Pssm-ID: 237177 [Multi-domain] Cd Length: 520 Bit Score: 49.39 E-value: 1.81e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   572 LEAKELArQHLRDqldEVEKETRSKLQEIDIFNNQLKElRE--IHNKQQLQKQKSMEAERlKQKEQERKIIELEKQKEEA 649
Cdd:PRK12704   60 LEAKEEI-HKLRN---EFEKELRERRNELQKLEKRLLQ-KEenLDRKLELLEKREEELEK-KEKELEQKQQELEKKEEEL 133

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|...
gi 47717123   650 QRRAQERDK---------------QWLEHVQQEDEHQRPRKLHEEEKLKREES 687
Cdd:PRK12704  134 EELIEEQLQelerisgltaeeakeILLEKVEEEARHEAAVLIKEIEEEAKEEA 186

Uncharacterized conserved protein, contains a C-terminal ATPase domain [Function unknown];

Pssm-ID: 443941 [Multi-domain] Cd Length: 1089 Bit Score: 49.91 E-value: 1.81e-05

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  335 LEDEQQQLEKKLpvTFEDKKRENFERGNLELEKRRQALLEQQRKEQ-ERLAQLERaEQERKERERQEQERKRQlELEKQL 413
Cdd:COG4913  293 LEAELEELRAEL--ARLEAELERLEARLDALREELDELEAQIRGNGgDRLEQLER-EIERLERELEERERRRA-RLEALL 368

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  414 EKQRELERQREEERRKEIERREAAKRELERQRqlEWERNRRQELLNQRNKeqedivvLKAKKKTLEFELEALNDKKHQLE 493
Cdd:COG4913  369 AALGLPLPASAEEFAALRAEAAALLEALEEEL--EALEEALAEAEAALRD-------LRRELRELEAEIASLERRKSNIP 439

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  494 GKLQDIRCRLTTQ-----------------RQE--------------------------------IESTNKSRELRIAEI 524
Cdd:COG4913  440 ARLLALRDALAEAlgldeaelpfvgelievRPEeerwrgaiervlggfaltllvppehyaaalrwVNRLHLRGRLVYERV 519

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  525 THLQQQLQESQQMLGRLIPE------------KQILN-----------DQLK----------QVQQN-SLH--------- 561
Cdd:COG4913  520 RTGLPDPERPRLDPDSLAGKldfkphpfrawlEAELGrrfdyvcvdspEELRrhpraitragQVKGNgTRHekddrrrir 599

                        330       340       350       360       370       380       390       400
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  562 ---------RDSLVTLKRALEAKELARQHLRDQLDEVEKET------RSKLQEIDIFNNQLKELREIHNK-QQLQKQK-- 623
Cdd:COG4913  600 sryvlgfdnRAKLAALEAELAELEEELAEAEERLEALEAELdalqerREALQRLAEYSWDEIDVASAEREiAELEAELer 679

                        410       420       430       440       450
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  624 ----SMEAERLKQ--KEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQR 672
Cdd:COG4913  680 ldasSDDLAALEEqlEELEAELEELEEELDELKGEIGRLEKELEQAEEELDELQD 734

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 43.93 E-value: 1.83e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1078 IAQVIASYTATGPEQLTLAPGQLI-LIRKKNPG---GWWEGELQARgkkrqIGWFPA 1130
Cdd:cd11762    1 LVRALYDYEAQSDEELSFPEGAIIrILRKDDNGvddGWWEGEFNGR-----VGVFPS 52

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212777 [Multi-domain] Cd Length: 53 Bit Score: 43.56 E-value: 1.85e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVIL-VTKKDGD-WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11843    4 ALYDYEGQESDELSFKAGDILTkLEEEDEQgWCKGRLDGRVGLYPANYV 52

Predicted nucleic acid-binding protein DR0291, contains C4-type Zn-ribbon domain [General function prediction only];

Pssm-ID: 441187 [Multi-domain] Cd Length: 236 Bit Score: 48.00 E-value: 1.97e-05

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  364 ELEKRRQALLEQQRKEQERLAQLERA-EQERKERERQEQERKrqlELEKQLEKqrelerqreeerrkeierreaAKRELE 442
Cdd:COG1579   14 ELDSELDRLEHRLKELPAELAELEDElAALEARLEAAKTELE---DLEKEIKR---------------------LELEIE 69

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  443 RQRQLEwERNRRQeLLNQRN-KE----QEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSR 517
Cdd:COG1579   70 EVEARI-KKYEEQ-LGNVRNnKEyealQKEIESLKRRISDLEDEILELMERIEELEEELAELEAELAELEAELEEKKAEL 147


                 ....*..
gi 47717123  518 ELRIAEI 524
Cdd:COG1579  148 DEELAEL 154

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 43.54 E-value: 2.02e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVmvkgewVDESQTGEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11960    3 RALYDYQAADDTEISFDPGDII------TDIEQIDEGWWRGTGPDGTYGLFPANYVE 53

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 43.78 E-value: 2.02e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQ------DMWWFGEVQGQKGWFPKSYV 966
Cdd:cd12058    4 ALYDYEASGEDELSLRRGDVVEVLSQDaavsgdDGWWAGKIRHRLGIFPANYV 56

Src Homology 3 domain of the p85alpha regulatory subunit of Class IA Phosphatidylinositol 3-kinases; Class I PI3Ks convert PtdIns(4,5)P2 to the critical second messenger PtdIns(3,4,5)P3. They are heterodimers and exist in multiple isoforms consisting of one catalytic subunit (out of four isoforms) and one of several regulatory subunits. Class IA PI3Ks associate with the p85 regulatory subunit family, which contains SH3, RhoGAP, and SH2 domains. The p85 subunits recruit the PI3K p110 catalytic subunit to the membrane, where p110 phosphorylates inositol lipids. Vertebrates harbor two p85 isoforms, called alpha and beta. In addition to regulating the p110 subunit, p85alpha interacts with activated FGFR3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212843 Cd Length: 75 Bit Score: 44.12 E-value: 2.11e-05

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMV-KGEWV-------DESQTGEPGWLGG--ELKGKTGWFPANYAEKI 804
Cdd:cd11910    4 YRALYDYKKEREEDIDLHLGDILTVnKGSLLalgfsegQEARPEEIGWLNGynETTGERGDFPGTYVEYI 73

Src Homology 3 domain of Interleukin-2-inducible T-cell Kinase; ITK (also known as Tsk or Emt) is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. ITK is expressed in T-cells and mast cells, and is important in their development and differentiation. Of the three Tec kinases expressed in T-cells, ITK plays the predominant role in T-cell receptor (TCR) signaling. It is activated by phosphorylation upon TCR crosslinking and is involved in the pathway resulting in phospholipase C-gamma1 activation and actin polymerization. It also plays a role in the downstream signaling of the T-cell costimulatory receptor CD28, the T-cell surface receptor CD2, and the chemokine receptor CXCR4. In addition, ITK is crucial for the development of T-helper(Th)2 effector responses. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212841 [Multi-domain] Cd Length: 56 Bit Score: 43.46 E-value: 2.11e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWK-GEVNGQVGLFPSNYV 1209
Cdd:cd11908    3 VIALYDYQTNDPQELALRYNEEYHLLDSSEIHWWRvQDKNGHEGYVPSSYL 53

Third Src homology 3 domain (or SH3C) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212924 Cd Length: 52 Bit Score: 43.43 E-value: 2.23e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVKGEwvdesqtgEPGWLGGELKGKTGWFPANY 800
Cdd:cd11991    2 YVAMYTYESNEQGDLTFQQGDVILVTKK--------DGDWWTGTVGDKTGVFPSNY 49

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The N-terminal SH3 domain of GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212738 [Multi-domain] Cd Length: 52 Bit Score: 43.11 E-value: 2.31e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVL-EQQDMWWF-GEVQGQKGWFPKSYV 966
Cdd:cd11804    1 EAVAKHDFKATAEDELSFKKGSILKVLnMEDDPNWYkAELDGKEGLIPKNYI 52

Src Homology 3 domain of SH3 domain-binding protein 4; SH3 domain-binding protein 4 (SH3BP4) is also called transferrin receptor trafficking protein (TTP). SH3BP4 is an endocytic accessory protein that interacts with endocytic proteins including clathrin and dynamin, and regulates the internalization of the transferrin receptor (TfR). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212691 Cd Length: 52 Bit Score: 43.47 E-value: 2.33e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11757    1 EVVAIKDYCPTNFTTLKFSKGDHLYVLDTSGGEWWYAHNTTEMGYIPSSYVQ 52

RIB43A; This family consists of several RIB43A-like eukaryotic proteins. Ciliary and flagellar microtubules contain a specialized set of protofilaments, termed ribbons, that are composed of tubulin and several associated proteins. RIB43A was first characterized in the unicellular biflagellate, Chlamydomonas reinhardtii although highly related sequences are present in several higher eukaryotes including humans. The function of this protein is unknown although the structure of RIB43A and its association with the specialized protofilament ribbons and with basal bodies is relevant to the proposed role of ribbons in forming and stabilising doublet and triplet microtubules and in organizing their three-dimensional structure. Human RIB43A homologs could represent a structural requirement in centriole replication in dividing cells.

Pssm-ID: 461780 [Multi-domain] Cd Length: 372 Bit Score: 48.74 E-value: 2.34e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    375 QQRKEQERLAQLERAEQERKER----------------ERQEQERKRQLELEKQLEKQRELERQREEERRKEIErreaaK 438
Cdd:pfam05914    1 VDLKEAAAIERRRQREEERKSRifnarnrtigvdvealDKQVEEKKRQEAAEKAREEAFAEEMVQNDKIALMLE-----K 75

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    439 RELERQRQLEWE----RNRRQELLNQRNKEQEDIVVLKAKKKTLE--------------FELEALNDKKHQLEGKLQdIR 500
Cdd:pfam05914   76 REEEDRRRLNKElnefRQQHQRPETRREFDLNDPDALKKDLPARVsdddprcgpssmqkFEGEDLNREERKKLQQEQ-MR 154

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    501 CRLTTQRQEIESTNKSRelRIAEITHlqqqlqesqqmlgrlipEKQILNDQLKQVQQNSLHRDSlvtlKRALeAKELARQ 580
Cdd:pfam05914  155 EWLEQQIEEKKQAEEEE--KHAELLY-----------------DQKRLERDRRALELAKLEEEC----RRAV-NAATKNF 210

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    581 HLRDQLDEVEKETRSKLQEidifnnQLKELREIH----------NKQQLQKQ-----------KSMEAERLK--QKEQER 637
Cdd:pfam05914  211 NQALAAEQAERRRLEKRQE------QEDNLAEIYnhltsdllteNPEVAQSSlgphrvipdrwKGMSPEQLKeiRKEQEQ 284

                          330       340       350       360
                   ....*....|....*....|....*....|....*....|....*...
gi 47717123    638 KIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRprklhEEEKLKRE 685
Cdd:pfam05914  285 QREEKERRREEEKQRDAEWDRQRLELARAALLLER-----EQQRLRRE 327

Src homology 3 domain of the CAS (Crk-Associated Substrate) scaffolding protein family member, Breast Cancer Anti-estrogen Resistance 1; BCAR1, also called p130cas or CASS1, is the founding member of the CAS family of scaffolding proteins and was originally identified through its ability to associate with Crk. The name BCAR1 was designated because the human gene was identified in a screen for genes that promote resistance to tamoxifen. It is widely expressed and its deletion is lethal in mice. It plays a role in regulating cell motility, survival, proliferation, transformation, cancer progression, and bacterial pathogenesis. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212934 Cd Length: 68 Bit Score: 43.88 E-value: 2.35e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQ----DMWWFGEVQGQKGWFPKSYVKLISG 971
Cdd:cd12001    5 AKALYDNVAESPDELSFRKGDIMTVLERDtqglDGWWLCSLHGRQGIVPGNRLKILVG 62

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 1; Shank1, also called SSTRIP (Somatostatin receptor-interacting protein), is a brain-specific protein that plays a role in the construction of postsynaptic density (PSD) and the maturation of dendritic spines. Mice deficient in Shank1 show altered PSD composition, thinner PSDs, smaller dendritic spines, and weaker basal synaptic transmission, although synaptic plasticity is normal. They show increased anxiety and impaired fear memory, but also show better spatial learning. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212915 [Multi-domain] Cd Length: 52 Bit Score: 43.08 E-value: 2.51e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  745 YRALYPFESRSHDEITIQpgdivmvKGEWVDESQTGEPGWLGGELKGKTGWFPAN 799
Cdd:cd11982    3 FMAVKPYQSQAEGEISLS-------KGEKIKVLSVGEGGFWEGQVKGRVGWFPSD 50

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 43.42 E-value: 2.59e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1010 MYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd12054    6 LFEYVPQNEDELELKVGDIIDINEEvEEGWWSGTLNGKSGLFPSNFVK 53

Third N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212730 Cd Length: 51 Bit Score: 43.11 E-value: 2.59e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQKGWFPKSYV 966
Cdd:cd11796    1 QARVLQDLSAQLDEELDLREGDVVTITGILDKGWFrGELNGRRGIFPEGFV 51

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 43.47 E-value: 2.60e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGD--WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11978    4 IARYDFCARDMRELSLLKGDVVKIYTKMSTngWWRGEVNGRVGWFPSTYV 53

Src Homology 3 domain of Membrane Protein, Palmitoylated 6 (or MAGUK p55 subfamily member 6); MPP6, also called Veli-associated MAGUK 1 (VAM-1) or PALS2, is a scaffolding protein that binds to Veli-1, a homolog of Caenorhabditis Lin-7. It is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212971 Cd Length: 61 Bit Score: 43.51 E-value: 2.69e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1164 YDYTAQNDD-------ELAFNKGQIINVLNKEDPDWWKG---EVNGQVGLFPSNYV 1209
Cdd:cd12038    6 FDYNPYNDNlipckeaGLKFSKGEILQIVNREDPNWWQAshvKEGGSAGLIPSQFL 61

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 49.20 E-value: 2.73e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    331 EEPVLEDEQQQLEKKLPVTFE----DKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQ 406
Cdd:pfam02463  417 LEDLLKEEKKEELEILEEEEEsielKQGKLTEEKEELEKQELKLLKDELELKKSEDLLKETQLVKLQEQLELLLSRQKLE 496

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    407 LELEKQLEKQRELERQREEERRKEIERREAAKRELERQ--------------RQLEWERNRRQELLNQRNKEQEDIVVLK 472
Cdd:pfam02463  497 ERSQKESKARSGLKVLLALIKDGVGGRIISAHGRLGDLgvavenykvaistaVIVEVSATADEVEERQKLVRALTELPLG 576

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    473 AKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQL 552
Cdd:pfam02463  577 ARKLRLLIPKLKLPLKSIAVLEIDPILNLAQLDKATLEADEDDKRAKVVEGILKDTELTKLKESAKAKESGLRKGVSLEE 656

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    553 KQVQQNSLHRDSLVTLKRALEAKELarqhLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERLK- 631
Cdd:pfam02463  657 GLAEKSEVKASLSELTKELLEIQEL----QEKAESELAKEEILRRQLEIKKKEQREKEELKKLKLEAEELLADRVQEAQd 732

                          330       340       350       360       370       380
                   ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123    632 -----QKEQERKIIElEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKREES 687
Cdd:pfam02463  733 kineeLKLLKQKIDE-EEEEEEKSRLKKEEKEEEKSELSLKEKELAEEREKTEKLKVEEEK 792

C2 domain second repeat of Ras GTPase activating proteins (GAPs); RasGAPs suppress Ras function by enhancing the GTPase activity of Ras proteins resulting in the inactive GDP-bound form of Ras. In this way it can control cellular proliferation and differentiation. The proteins here all contain two tandem C2 domains, a Ras-GAP domain, and a pleckstrin homology (PH)-like domain. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members here have a type-I topology.

Pssm-ID: 176057 [Multi-domain] Cd Length: 137 Bit Score: 45.44 E-value: 2.80e-05

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1598 LMVNVVEGIELKPCRShGKSNPYCEVTMGSQCHI----TKTIQDTLNPKWNSNCQF---------------FIRDLEQEV 1658
Cdd:cd08675    1 LSVRVLECRDLALKSN-GTCDPFARVTLNYSSKTdtkrTKVKKKTNNPRFDEAFYFeltigfsyekksfkvEEEDLEKSE 79

                         90       100
                 ....*....|....*....|....
gi 47717123 1659 LCITVFERDQFSPDDFLGrtEIRV 1682
Cdd:cd08675   80 LRVELWHASMVSGDDFLG--EVRI 101

First Src Homology 3 domain (SH3A) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CD2AP. SH3A binds to the PXXXPR motif present in c-Cbl and the cytoplasmic domain of cell adhesion protein CD2. Its interaction with CD2 anchors CD2 at sites of cell contact. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212986 Cd Length: 56 Bit Score: 43.29 E-value: 2.84e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  749 YPFESRSHDEITIQPGDIVMvkgewvDESQTGEPGWLGGELKGKTGWFPANYAEKI 804
Cdd:cd12053    6 YDYDAVHEDELTIRVGEIIR------NVKKLEEEGWLEGELNGRRGMFPDNFVKEI 55

Third Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212858 Cd Length: 57 Bit Score: 43.06 E-value: 2.86e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEV--NGQVGLFPSNYV 1209
Cdd:cd11925    4 LALYAYKPQKNDELELRKGEMYRVIEKCQDGWFKGTSlrTGVSGVFPGNYV 54

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213017 [Multi-domain] Cd Length: 57 Bit Score: 43.26 E-value: 2.90e-05

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  743 VYYrALYPFESRSHDEITIQPGDIVMVKgEWVDesQTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd12141    1 VYY-AVYTFKARSPNELSVSANQRVRIL-EFSD--LTGNKEWWLAEANGQKGYVPSNYIRK 57

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the third SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212714 [Multi-domain] Cd Length: 55 Bit Score: 43.06 E-value: 2.92e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVG--DKAGVFPSNYV 1055
Cdd:cd11780    2 YRALYSYTPQNEDELELREGDIVYVMEKCDDgWFVGTSErtGLFGTFPGNYV 53

First Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212852 [Multi-domain] Cd Length: 55 Bit Score: 43.03 E-value: 2.95e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQKGWFPKSYVKLI 969
Cdd:cd11919    2 PARAKFDFKAQTLKELPLQKGDIVYIYKQIDQNWYeGEHHGRVGIFPRSYIELL 55

Second Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the second SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213009 [Multi-domain] Cd Length: 54 Bit Score: 43.10 E-value: 2.96e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1081 VIASYTATGPEQLTLAPGQLILIRKKNPGGWWegELQARGKKrqiGWFPANYVK 1134
Cdd:cd12076    5 VIYPYTARDQDEINLEKGAVVEVIQKNLEGWW--KIRYQGKE---GWAPASYLK 53

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 43.22 E-value: 2.97e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1085 YTATGPEQLTLAPGQLILIRKKNPG-----GWWEGELQARgkkrqIGWFPANYV 1133
Cdd:cd12059    8 YEASAEDELTLRRGDRVEVLSKDSAvsgdeGWWTGKINDR-----VGIFPSNYV 56

Uncharacterized protein, contains DUF3084 domain [Function unknown];

Pssm-ID: 443500 [Multi-domain] Cd Length: 370 Bit Score: 48.36 E-value: 2.98e-05

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  353 KKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEkQLEKQrelerqreeerrkeie 432
Cdd:COG4372    5 GEKVGKARLSLFGLRPKTGILIAALSEQLRKALFELDKLQEELEQLREELEQAREELE-QLEEE---------------- 67

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  433 rREAAKRELER-QRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIE 511
Cdd:COG4372   68 -LEQARSELEQlEEELEELNEQLQAAQAELAQAQEELESLQEEAEELQEELEELQKERQDLEQQRKQLEAQIAELQSEIA 146

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  512 STNKSRELRIAEITHLQQQLQESQQMLGRLIPEK--QILNDQLKQVQQNSLHRDSLVTLKRALEAKEL----ARQHLRDQ 585
Cdd:COG4372  147 EREEELKELEEQLESLQEELAALEQELQALSEAEaeQALDELLKEANRNAEKEEELAEAEKLIESLPRelaeELLEAKDS 226

                        250       260       270       280       290       300       310
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 47717123  586 LDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQ 659
Cdd:COG4372  227 LEAKLGLALSALLDALELEEDKEELLEEVILKEIEELELAILVEKDTEEEELEIAALELEALEEAALELKLLAL 300

Second C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212894 [Multi-domain] Cd Length: 53 Bit Score: 42.90 E-value: 3.01e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVmVKGEWVDesqtgePGWLGGELKGKTGWFPANYAE 802
Cdd:cd11961    3 KALYDYDAAEDNELSFFENDKI-INIEFVD------DDWWLGECHGSRGLFPSNYVE 52

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 42.97 E-value: 3.18e-05

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123    744 YYRALYPFESRSHDEITIQPGDIVMVKGEwvdesqtGEPGWLGGELKGKTGWFPANYAEKI 804
Cdd:pfam07653    1 YGRVIFDYVGTDKNGLTLKKGDVVKVLGK-------DNDGWWEGETGGRVGLVPSTAVEEI 54

Second Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212857 Cd Length: 56 Bit Score: 43.03 E-value: 3.21e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNG--QVGLFPSNYVKL 1211
Cdd:cd11924    2 EAVAQYTFKGDLEVELSFRKGEHICLIRKVNENWYEGRITGtgRQGIFPASYVQV 56

C2 domain found in the Human KIAA0528 cDNA clone; The members of this CD are named after the Human KIAA0528 cDNA clone. All members here contain a single C2 repeat. No other information on this protein is currently known. The C2 domain was first identified in PKC. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176070 [Multi-domain] Cd Length: 110 Bit Score: 44.61 E-value: 3.34e-05

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1612 RSHGKSNPYCEVTMGSQCHITKTIQDTLNPKWNSncQFFI-----RDLEQEVLCITVFERDQFSPDDFLGRTEI 1680
Cdd:cd08688   16 RSSDLTDAFVEVKFGSTTYKTDVVKKSLNPVWNS--EWFRfevddEELQDEPLQIRVMDHDTYSANDAIGKVYI 87

cell envelope integrity inner membrane protein TolA; Provisional

Pssm-ID: 236545 [Multi-domain] Cd Length: 387 Bit Score: 48.26 E-value: 3.35e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   615 NKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKREESVKKKDGE 694
Cdd:PRK09510   65 NRQQQQQKSAKRAEEQRKKKEQQQAEELQQKQAAEQERLKQLEKERLAAQEQKKQAEEAAKQAALKQKQAEEAAAKAAAA 144

                          90       100
                  ....*....|....*....|....*
gi 47717123   695 EKGKQEAQDKlgrlfhQHQEPAKPA 719
Cdd:PRK09510  145 AKAKAEAEAK------RAAAAAKKA 163

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 48.91 E-value: 3.43e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   369 RQAL-LEQQRKEQERLAQLERAEQERKER-----ERQEQERKRQLELEKQLEKqrelerqreeeRrkeierreaakreLE 442
Cdd:PRK03918  152 RQILgLDDYENAYKNLGEVIKEIKRRIERlekfiKRTENIEELIKEKEKELEE-----------V-------------LR 207

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   443 RQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTnKSRELRIA 522
Cdd:PRK03918  208 EINEISSELPELREELEKLEKEVKELEELKEEIEELEKELESLEGSKRKLEEKIRELEERIEELKKEIEEL-EEKVKELK 286

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   523 EITHLQQqlqesqqmlgrlipEKQILNDQLKQvqqnslHRDSLVTLKRALEAKELARQHLRDQLDEVE------KETRSK 596
Cdd:PRK03918  287 ELKEKAE--------------EYIKLSEFYEE------YLDELREIEKRLSRLEEEINGIEERIKELEekeerlEELKKK 346

                         250       260       270       280       290
                  ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123   597 LQEIDifnNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQE 655
Cdd:PRK03918  347 LKELE---KRLEELEERHELYEEAKAKKEELERLKKRLTGLTPEKLEKELEELEKAKEE 402

Domain of unknown function (DUF4686); This family of proteins is found in eukaryotes. Proteins in this family are typically between 498 and 775 amino acids in length. There is a conserved DLK sequence motif.

Pssm-ID: 464838 [Multi-domain] Cd Length: 384 Bit Score: 48.14 E-value: 3.44e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    367 KRRQALLEQQRKEQERLAQ-LER-------AEQE-RKERER-----------QEQERKRQLELeKQLEKQRELERQREEE 426
Cdd:pfam15742    2 SSGEKLKYQQQEEVQQLRQnLQRlqilctsAEKElRYERGKnldlkqhnsllQEENIKIKAEL-KQAQQKLLDSTKMCSS 80

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    427 RRKEIerreaaKRELERQRQLEWERNRRQELLNQRNKEQEDIVVLKAK-----KKTLEFE-----------LEALNDKKH 490
Cdd:pfam15742   81 LTAEW------KHCQQKIRELELEVLKQAQSIKSQNSLQEKLAQEKSRvadaeEKILELQqklehahkvclTDTCILEKK 154

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    491 QLEGK---LQDIRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQIlndqlkQVQQNSLHRDSLVT 567
Cdd:pfam15742  155 QLEERikeASENEAKLKQQYQEEQQKRKLLDQNVNELQQQVRSLQDKEAQLEMTNSQQQL------RIQQQEAQLKQLEN 228

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    568 LKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQL-KELREIHNKQQLQKQKSMEAERLKQKEQER---KIIELE 643
Cdd:pfam15742  229 EKRKSDEHLKSNQELSEKLSSLQQEKEALQEELQQVLKQLdVHVRKYNEKHHHHKAKLRRAKDRLVHEVEQrdeRIKQLE 308

                          330       340       350       360
                   ....*....|....*....|....*....|....*....|....*
gi 47717123    644 KQKEEAQRRAqERDKQWLEHVQQEDEH--QRPRKL----HEEEKL 682
Cdd:pfam15742  309 NEIGILQQQS-EKEKAFQKQVTAQNEIllLEKRKLleqlTEQEEL 352

chromosome partition protein MukB;

Pssm-ID: 235316 [Multi-domain] Cd Length: 1486 Bit Score: 48.80 E-value: 3.54e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   351 EDKKRENFERGnLELEKRRQALLEQQRKEQERLAQLERAEQERKERER----------------------QEQERKRQ-- 406
Cdd:PRK04863  278 ANERRVHLEEA-LELRRELYTSRRQLAAEQYRLVEMARELAELNEAESdleqdyqaasdhlnlvqtalrqQEKIERYQad 356

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   407 -LELEKQLEKQRELERQREEERRKEIERREAAKRELER-QRQLEwERNRRQELLNQRNKEQEDIVVLKAKKKTL----EF 480
Cdd:PRK04863  357 lEELEERLEEQNEVVEEADEQQEENEARAEAAEEEVDElKSQLA-DYQQALDVQQTRAIQYQQAVQALERAKQLcglpDL 435

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   481 ELEALNDKKHQLEGKLQDircrLTTQRQEIEstnksRELRIAEITHLqqqlqesqqmlgrlIPEK--QILNDQLKQVQQN 558
Cdd:PRK04863  436 TADNAEDWLEEFQAKEQE----ATEELLSLE-----QKLSVAQAAHS--------------QFEQayQLVRKIAGEVSRS 492

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   559 SLHRDSLVTLKRALEAKELA--RQHLRDQLDEVEKETRSKlqeidifNNQLKELREIHNKQQLQKQKSMEAERLkQKEQE 636
Cdd:PRK04863  493 EAWDVARELLRRLREQRHLAeqLQQLRMRLSELEQRLRQQ-------QRAERLLAEFCKRLGKNLDDEDELEQL-QEELE 564

                         330       340       350
                  ....*....|....*....|....*....|..
gi 47717123   637 RKIIELEKQKEEA-QRRAQERDKQwlEHVQQE 667
Cdd:PRK04863  565 ARLESLSESVSEArERRMALRQQL--EQLQAR 594

cell envelope integrity inner membrane protein TolA; Provisional

Pssm-ID: 236545 [Multi-domain] Cd Length: 387 Bit Score: 47.88 E-value: 4.05e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   574 AKELARQHlRDQLDEVEKETRSKLQEidifNNQLKELREIHNKQQlQKQKSMEAERLKQKEQErkiieleKQKEEAQRRA 653
Cdd:PRK09510   61 VEQYNRQQ-QQQKSAKRAEEQRKKKE----QQQAEELQQKQAAEQ-ERLKQLEKERLAAQEQK-------KQAEEAAKQA 127

                          90       100       110
                  ....*....|....*....|....*....|...
gi 47717123   654 QERDKQWLEHVQQEDEHQrprKLHEEEKLKREE 686
Cdd:PRK09510  128 ALKQKQAEEAAAKAAAAA---KAKAEAEAKRAA 157

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 42.70 E-value: 4.25e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQ--DMWWFGE-VQGQKGWFPKSYV 966
Cdd:cd11763    1 KVRALYDFDSQPSGELSLRAGEVLTITRQDvgDGWLEGRnSRGEVGLFPSSYV 53

First or N-terminal Src homology 3 domain of the p47phox subunit of NADPH oxidase, also called Neutrophil Cytosolic Factor 1; p47phox, or NCF1, is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox), which plays a key role in the ability of phagocytes to defend against bacterial infections. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p47phox is required for activation of NADH oxidase and plays a role in translocation. It contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), a polybasic/autoinhibitory region, and a C-terminal proline-rich region (PRR). This model characterizes the first SH3 domain (or N-SH3) of p47phox. In its inactive state, the tandem SH3 domains interact intramolecularly with the autoinhibitory region; upon activation, the tandem SH3 domains are exposed through a conformational change, resulting in their binding to the PRR of p22phox and the activation of NADPH oxidase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212954 [Multi-domain] Cd Length: 53 Bit Score: 42.64 E-value: 4.25e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVmvkgEWVDESQTGepgWLGGELKGKTGWFPANYAE 802
Cdd:cd12021    2 YRAIADYEKSSKSEMALKTGDVV----EVVEKSENG---WWFCQLKAKRGWVPASYLE 52

Src Homology 3 domain of Tec-like Protein Tyrosine Kinases; The Tec (Tyrosine kinase expressed in hepatocellular carcinoma) subfamily is composed of Tec, Btk, Bmx (Etk), Itk (Tsk, Emt), Rlk (Txk), and similar proteins. They are cytoplasmic (or nonreceptor) tyr kinases containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. Most Tec subfamily members (except Rlk) also contain an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation. In addition, some members contain the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. Tec kinases are expressed mainly by haematopoietic cells, although Tec and Bmx are also found in endothelial cells. B-cells express Btk and Tec, while T-cells express Itk, Txk, and Tec. Collectively, Tec kinases are expressed in a variety of myeloid cells such as mast cells, platelets, macrophages, and dendritic cells. Each Tec kinase shows a distinct cell-type pattern of expression. The function of Tec kinases in lymphoid cells have been studied extensively. They play important roles in the development, differentiation, maturation, regulation, survival, and function of B-cells and T-cells. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212702 [Multi-domain] Cd Length: 54 Bit Score: 42.65 E-value: 4.30e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1008 IAMYTYESSEQGDLTFQQGD-VILVTKKDGDWWtgTVGDK---AGVFPSNYVR 1056
Cdd:cd11768    3 VALYDFQPIEPGDLPLEKGEeYVVLDDSNEHWW--RARDKngnEGYIPSNYVT 53

Third Src homology 3 domain (or SH3C) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (SH3C) of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212925 Cd Length: 52 Bit Score: 42.69 E-value: 4.40e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  745 YRALYPFESrshdeitIQPGDIVMVKGEWVDESQT-GEpgWLGGELKGKTGWFPANY 800
Cdd:cd11992    2 YIALYPYSS-------SEPGDLTFNEGEEILVTQKdGE--WWTGSIEDRTGIFPSNY 49

Alpha helical coiled-coil rod protein (HCR); This family consists of several mammalian alpha helical coiled-coil rod HCR proteins. The function of HCR is unknown but it has been implicated in psoriasis in humans and is thought to affect keratinocyte proliferation.

Pssm-ID: 284517 [Multi-domain] Cd Length: 749 Bit Score: 48.21 E-value: 4.57e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    478 LEFELEALNDKKHQLEGKLQdIRCRLTTQRqeiesTNKSRELRIAEithlqqqlqesqqmLGRLIPEKQILNDQLKQVQQ 557
Cdd:pfam07111  479 LSLELEQLREERNRLDAELQ-LSAHLIQQE-----VGRAREQGEAE--------------RQQLSEVAQQLEQELQRAQE 538

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    558 nslhrdSLVTLKRALEA----------------------KELARQHLRDQLDEVEKETRSKLQEIDifnNQLKELREIHN 615
Cdd:pfam07111  539 ------SLASVGQQLEVarqgqqesteeaaslrqeltqqQEIYGQALQEKVAEVETRLREQLSDTK---RRLNEARREQA 609

                          170       180       190       200       210       220
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123    616 KQQLQ-KQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQ-----ERDKQ-WLEHVQQEDEHQRPRK 675
Cdd:pfam07111  610 KAVVSlRQIQHRATQEKERNQELRRLQDEARKEEGQRLARrvqelERDKNlMLATLQQEGLLSRYKQ 676

C2A domain first repeat present in Synaptotagmin 8; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176033 [Multi-domain] Cd Length: 124 Bit Score: 44.70 E-value: 4.61e-05

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTMGSQCHITKTIQ---DTLNPKWNSNCQFFIR--DLEQEVLCITVFERDQFS 1670
Cdd:cd08387   16 GILNVKLIQARNLQPRDFSGTADPYCKVRLLPDRSNTKQSKihkKTLNPEFDESFVFEVPpqELPKRTLEVLLYDFDQFS 95

                         90
                 ....*....|....*
gi 47717123 1671 PDDFLGRTEIRVADI 1685
Cdd:cd08387   96 RDECIGVVELPLAEV 110

NIMA-related protein kinase; Provisional

Pssm-ID: 173502 [Multi-domain] Cd Length: 1021 Bit Score: 48.58 E-value: 4.62e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   355 RENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKqLEKQRELerqreeerrkeierr 434
Cdd:PTZ00266  432 KDHAERARIEKENAHRKALEMKILEKKRIERLEREERERLERERMERIERERLERER-LERERLE--------------- 495

                          90       100
                  ....*....|....*....|....*..
gi 47717123   435 eaaKRELERQRQLEWERNRRQELLNQR 461
Cdd:PTZ00266  496 ---RDRLERDRLDRLERERVDRLERDR 519

MAP7 (E-MAP-115) family; The organization of microtubules varies with the cell type and is presumably controlled by tissue-specific microtubule-associated proteins (MAPs). The 115-kDa epithelial MAP (E-MAP-115/MAP7) has been identified as a microtubule-stabilising protein predominantly expressed in cell lines of epithelial origin. The binding of this microtubule associated protein is nucleotide independent.

Pssm-ID: 461709 [Multi-domain] Cd Length: 153 Bit Score: 45.42 E-value: 4.80e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    606 QLKELREIHNKQQLQKQksmEAERLKQKEQERKIIE-LEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKR 684
Cdd:pfam05672   22 QAREQREREEQERLEKE---EEERLRKEELRRRAEEeRARREEEARRLEEERRREEEERQRKAEEEAEEREQREQEEQER 98


                   ..
gi 47717123    685 EE 686
Cdd:pfam05672   99 LQ 100

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 3 (PACSIN3); PACSIN 3 or Syndapin III (Synaptic dynamin-associated protein III) is expressed ubiquitously and regulates glucose uptake in adipocytes through its role in GLUT1 trafficking. It also modulates the subcellular localization and stimulus-specific function of the cation channel TRPV4. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212930 [Multi-domain] Cd Length: 56 Bit Score: 42.64 E-value: 4.95e-05

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  743 VYYRALYPFESRSHDEITIQPGDIVMVKGEwvdesqTGEPGWLGGEL-KGKTGWFPANYAE 802
Cdd:cd11997    2 VRVRALYDYTGQEADELSFKAGEELLKIGE------EDEQGWCKGRLlSGRIGLYPANYVE 56

Src homology 3 domain of High osmolarity signaling protein Sho1p; Sho1p (or Sho1), also called SSU81 (Suppressor of SUA8-1 mutation), is a yeast membrane protein that regulates adaptation to high salt conditions by activating the HOG (high-osmolarity glycerol) pathway. High salt concentrations lead to the localization to the membrane of the MAPKK Pbs2, which is then activated by the MAPKK Ste11 and in turn, activates the MAPK Hog1. Pbs2 is localized to the membrane though the interaction of its PxxP motif with the SH3 domain of Sho1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212789 [Multi-domain] Cd Length: 55 Bit Score: 42.41 E-value: 5.04e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1009 AMYTYESSEQ--GDLTFQQGDVILVTKKDGDWWTGTVGD-KAGVFPSNYVRL 1057
Cdd:cd11855    4 ALYPYDASPDdpNELSFEKGEILEVSDTSGKWWQARKSNgETGICPSNYLQL 55

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 42.67 E-value: 5.13e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1085 YTATGPEQLTLAPGQLILIRKKNPGGWWEGELqarGKKRQIgWFPANYVK 1134
Cdd:cd11970   12 YKAQREDELTFTKNAIIQNVEKQEGGWWRGDY---GGKKQL-WFPSNYVE 57

Src homology 3 domain of RUN and SH3 domain-containing proteins 1 and 2; RUSC1 and RUSC2, that were originally characterized in silico. They are adaptor proteins consisting of RUN, leucine zipper, and SH3 domains. RUSC1, also called NESCA (New molecule containing SH3 at the carboxy-terminus), is highly expressed in the brain and is translocated to the nuclear membrane from the cytoplasm upon stimulation with neurotrophin. It plays a role in facilitating neurotrophin-dependent neurite outgrowth. It also interacts with NEMO (or IKKgamma) and may function in NEMO-mediated activation of NF-kB. RUSC2, also called Iporin, is expressed ubiquitously with highest amounts in the brain and testis. It interacts with the small GTPase Rab1 and the Golgi matrix protein GM130, and may function in linking GTPases to certain intracellular signaling pathways. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212744 Cd Length: 50 Bit Score: 42.43 E-value: 5.16e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNY 1208
Cdd:cd11810    2 VRALCHHVATDSGQLSFRKGDILRVIARVDDDWLLCTRGSTKGLVPLSY 50

Src homology 3 domain of the CAS (Crk-Associated Substrate) scaffolding protein family member, Breast Cancer Anti-estrogen Resistance 1; BCAR1, also called p130cas or CASS1, is the founding member of the CAS family of scaffolding proteins and was originally identified through its ability to associate with Crk. The name BCAR1 was designated because the human gene was identified in a screen for genes that promote resistance to tamoxifen. It is widely expressed and its deletion is lethal in mice. It plays a role in regulating cell motility, survival, proliferation, transformation, cancer progression, and bacterial pathogenesis. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212934 Cd Length: 68 Bit Score: 42.72 E-value: 5.16e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1162 GMYDYTAQNDDELAFNKGQIINVLNKEDP---DWWKGEVNGQVGLFPSNYVKLTTDM 1215
Cdd:cd12001    7 ALYDNVAESPDELSFRKGDIMTVLERDTQgldGWWLCSLHGRQGIVPGNRLKILVGM 63

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 3; Shank3, also called ProSAP2 (Proline-rich synapse-associated protein 2), is widely expressed. It plays a role in the formation of dendritic spines and synapses. Haploinsufficiency of the Shank3 gene causes the 22q13 deletion/Phelan-McDermid syndrome, and variants of Shank3 have been implicated in autism spectrum disorder, schizophrenia, and intellectual disability. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212917 Cd Length: 52 Bit Score: 42.25 E-value: 5.16e-05

                         10        20        30
                 ....*....|....*....|....*....|....*..
gi 47717123  763 PGDIVMVKGEWVDESQTGEPGWLGGELKGKTGWFPAN 799
Cdd:cd11984   14 EGEIQLNRGERVKVLSIGEGGFWEGTVKGRTGWFPAD 50

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 42.33 E-value: 5.16e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARgkkrqIGWFPANYVKL 1135
Cdd:cd11781    2 ARALYPFKAQSAKELSLKKGDIIYIRRQIDKNWYEGEHNGR-----VGIFPASYVEI 53

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212849 [Multi-domain] Cd Length: 59 Bit Score: 42.67 E-value: 5.19e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1080 QVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQargKKRQIGWFPANYVKLL 1136
Cdd:cd11916    5 QALYSYAPQNDDELELRDGDIVDVMEKCDDGWFVGTSR---RTKQFGTFPGNYVKLL 58

Third Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212836 [Multi-domain] Cd Length: 59 Bit Score: 42.35 E-value: 5.42e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQD---MWW-FGEVQGQKGWFPKSYVKLIS 970
Cdd:cd11903    4 QTLYPFSSVTEEELNFEKGETMEVIEKPEndpEWWkCKNSRGQVGLVPKNYVVVLS 59

First Src homology 3 domain (or SH3A) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212920 [Multi-domain] Cd Length: 55 Bit Score: 42.29 E-value: 5.44e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1085 YTATGPEQLTLAPGQLILIRKKNPG--GWWEGELqargkKRQIGWFPANYVK 1134
Cdd:cd11987    8 FEARSHDEITIQPGDIVMVDESQTGepGWLGGEL-----KGKTGWFPANYAE 54

C-terminal (Fourth) Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the fourth SH3 domain, located at the C-terminus of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212719 Cd Length: 55 Bit Score: 42.45 E-value: 5.49e-05

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELK--GKTGWFPANYAEK 803
Cdd:cd11785    2 YRVIVPYPPQSEAELELKEGDIVFV-------HKKREDGWFKGTLQrtGKTGLFPGSFVES 55

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing (Stac) proteins; Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. This model represents the first C-terminal SH3 domain of Stac1 and Stac3, and the single C-terminal SH3 domain of Stac2. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212767 [Multi-domain] Cd Length: 53 Bit Score: 42.10 E-value: 5.67e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYV 966
Cdd:cd11833    4 ALYKFKPQENEDLEMRPGDKITLLDDSNEdWWKGKIEDRVGFFPANFV 51

Src homology 3 domain of Type I fungal Myosins; Type I myosins (myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Saccharomyces cerevisiae has two myosins-I, Myo3 and Myo5, which are involved in endocytosis and the polarization of the actin cytoskeleton. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212792 [Multi-domain] Cd Length: 55 Bit Score: 42.37 E-value: 5.75e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQV--GLFPSNYVKL 1211
Cdd:cd11858    5 LYDFAGSVANELSLKKDDIVYIVQKEDNGWWLAKKLDESkeGWVPAAYLEE 55

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 42.35 E-value: 5.82e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1080 QVIASY--TATGPEQLTLAPGQLILIRKKNPGgWWEGELQargkKRQIGWFPANYVKL 1135
Cdd:cd11837    1 TATALYpwRAKKENHLSFAKGDIITVLEQQEM-WWFGELE----GGEEGWFPKSYVKE 53

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 1; ASAP1 is also called DDEF1 (Development and Differentiation Enhancing Factor 1), AMAP1, centaurin beta-4, or PAG2. an Arf GTPase activating protein (GAP) with activity towards Arf1 and Arf5 but not Arf6. However, it has been shown to bind GTP-Arf6 stably without GAP activity. It has been implicated in cell growth, migration, and survival, as well as in tumor invasion and malignancy. It binds paxillin and cortactin, two components of invadopodia which are essential for tumor invasiveness. It also binds focal adhesion kinase (FAK) and the SH2/SH3 adaptor CrkL. ASAP1 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212898 [Multi-domain] Cd Length: 57 Bit Score: 42.30 E-value: 5.93e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQ---KGWFPKSYVKLI 969
Cdd:cd11965    1 RVKTIYDCQADNDDELTFVEGEVIIVTGEEDQeWWIGHIEGQperKGVFPVSFVHIL 57

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 42.35 E-value: 6.01e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQArgkkrQIGWFPANYVK 1134
Cdd:cd11786    2 AKALYNYEGKEPGDLSFKKGDIILLRKRIDENWYHGECNG-----KQGFFPASYVQ 52

N-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212881 [Multi-domain] Cd Length: 54 Bit Score: 42.11 E-value: 6.03e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVKgewvdeSQTGEPGWLGGELKGKTGWFPANY 800
Cdd:cd11948    4 ALYSFQATESDELPFQKGDILKIL------NMEDDQNWYKAELQGREGYIPKNY 51

Myosin tail; The myosin molecule is a multi-subunit complex made up of two heavy chains and four light chains it is a fundamental contractile protein found in all eukaryote cell types. This family consists of the coiled-coil myosin heavy chain tail region. The coiled-coil is composed of the tail from two molecules of myosin. These can then assemble into the macromolecular thick filament. The coiled-coil region provides the structural backbone the thick filament.

Pssm-ID: 460256 [Multi-domain] Cd Length: 1081 Bit Score: 47.86 E-value: 6.15e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    327 QRLPEEPVLEDEQQQLEKKLPVTFEDKkRENFERGNLELEKRRQALLEQQRKEQERLAQLEraeQERKERERQEQERKRQ 406
Cdd:pfam01576   36 QQLCEEKNALQEQLQAETELCAEAEEM-RARLAARKQELEEILHELESRLEEEEERSQQLQ---NEKKKMQQHIQDLEEQ 111

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    407 LELEK------QLEKQRELERQREEERRKEIERREAAKRELERQ----------RQLEWERNRRQELLNQRNKEQEDIVV 470
Cdd:pfam01576  112 LDEEEaarqklQLEKVTTEAKIKKLEEDILLLEDQNSKLSKERKlleeriseftSNLAEEEEKAKSLSKLKNKHEAMISD 191

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    471 LKAKKKTLEFELEALNDKKHQLEGKLQDIR---CRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQI 547
Cdd:pfam01576  192 LEERLKKEEKGRQELEKAKRKLEGESTDLQeqiAELQAQIAELRAQLAKKEEELQAALARLEEETAQKNNALKKIRELEA 271

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    548 LNDQLKQ-VQQNSLHRDSLVTLKRAL-EAKELARQHLRDQLDE--VEKETRSKL-QEIDIFNNQLKELREIHNKQ-QLQK 621
Cdd:pfam01576  272 QISELQEdLESERAARNKAEKQRRDLgEELEALKTELEDTLDTtaAQQELRSKReQEVTELKKALEEETRSHEAQlQEMR 351

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    622 QKSMEA-----ERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRpRKLH---EEEKLKREESvkkkdg 693
Cdd:pfam01576  352 QKHTQAleeltEQLEQAKRNKANLEKAKQALESENAELQAELRTLQQAKQDSEHKR-KKLEgqlQELQARLSES------ 424

                          410
                   ....*....|....*
gi 47717123    694 eEKGKQEAQDKLGRL 708
Cdd:pfam01576  425 -ERQRAELAEKLSKL 438

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53, Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2 (BAIAP2)-Like proteins, and similar proteins; Proteins in this family include IRSp53, BAIAP2L1, BAIAP2L2, and similar proteins. They all contain an Inverse-Bin/Amphiphysin/Rvs (I-BAR) or IMD domain in addition to the SH3 domain. IRSp53, also known as BAIAP2, is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. BAIAP2L1, also called IRTKS (Insulin Receptor Tyrosine Kinase Substrate), serves as a substrate for the insulin receptor and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. IRSp53 and IRTKS also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. The SH3 domains of IRSp53 and IRTKS have been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212713 [Multi-domain] Cd Length: 57 Bit Score: 42.31 E-value: 6.21e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1080 QVIASYTATGPEQLTLAPGQLI-LIRKKNPGGWWEGELQaRGKKRqiGWFPANYVK 1134
Cdd:cd11779    4 KALYPHAAGGETQLSFEEGDVItLLGPEPRDGWHYGENE-RSGRR--GWFPIAYTE 56

Src Homology 3 domain of Myosin XV; This subfamily is composed of proteins with similarity to Myosin XVa. Myosin XVa is an unconventional myosin that is critical for the normal growth of mechanosensory stereocilia of inner ear hair cells. Mutations in the myosin XVa gene are associated with nonsyndromic hearing loss. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212817 [Multi-domain] Cd Length: 56 Bit Score: 42.31 E-value: 6.21e-05

                         10        20        30
                 ....*....|....*....|....*....|....*....
gi 47717123  932 LNFNKNDVITVL-EQQDM---WWFGEVQGQKGWFPKSYV 966
Cdd:cd11884   16 LSFHKGDVIKLLpKEGPLdpgWLFGTLDGRSGAFPKEYV 54

Second Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the second SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213010 Cd Length: 54 Bit Score: 42.33 E-value: 6.44e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*
gi 47717123 1166 YTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd12077    9 YTSQGKDEIGFEKGVTVEVIQKNLEGWWYIRYLGKEGWAPASYLK 53

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212850 [Multi-domain] Cd Length: 61 Bit Score: 42.29 E-value: 6.45e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1004 GEEFIAMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKA--GVFPSNYVR 1056
Cdd:cd11917    4 GEPFQALYNYMPRNEDELELREGDVIDVMEKcDDGWFVGTSRRTKffGTFPGNYVK 59

Fifth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212752 [Multi-domain] Cd Length: 50 Bit Score: 42.09 E-value: 6.81e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTVGDKAGVFPSNY 1054
Cdd:cd11818    4 ALYDFTGENEDELSFKAGDIITeLESIDEEWMSGELRGKSGIFPKNF 50

Second Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212749 [Multi-domain] Cd Length: 52 Bit Score: 41.78 E-value: 7.10e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd11815    3 VVLHDFPAEHSDDLSLNSGEIVyLLEKIDTEWYRGKCKNTTGIFPANHVK 52

Guanylate-binding protein, C-terminal domain; Guanylate-binding protein (GBP), C-terminal domain. Guanylate-binding proteins (GBPs) are synthesized after activation of the cell by interferons. The biochemical properties of GBPs are clearly different from those of Ras-like and heterotrimeric GTP-binding proteins. They bind guanine nucleotides with low affinity (micromolar range), are stable in their absence, and have a high turnover GTPase. In addition to binding GDP/GTP, they have the unique ability to bind GMP with equal affinity and hydrolyze GTP not only to GDP, but also to GMP. This C-terminal domain has been shown to mediate inhibition of endothelial cell proliferation by inflammatory cytokines.

Pssm-ID: 293879 [Multi-domain] Cd Length: 291 Bit Score: 46.80 E-value: 7.25e-05

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  331 EEPVLEDEQQQLEKKLpvtfEDKKReNFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELE 410
Cdd:cd16269  213 ERKLLEEQQRELEQKL----EDQER-SYEEHLRQLKEKMEEERENLLKEQERALESKLKEQEALLEEGFKEQAELLQEEI 287


                 ....
gi 47717123  411 KQLE 414
Cdd:cd16269  288 RSLK 291

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 41.94 E-value: 7.28e-05

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11781    3 RALYPFKAQSAKELSLKKGDIIYIRRQiDKNWYEGEHNGRVGIFPASYV 51

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 41.83 E-value: 7.67e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKGEwVDESqtgepgWLGGELKGKTGWFPANYAE 802
Cdd:cd11928    2 CGKALYSYEGKEPGDLKFNKGDIIILRRK-VDEN------WYHGELNGCHGFLPASYIQ 53

DNA double-strand break repair Rad50 ATPase;

Pssm-ID: 179385 [Multi-domain] Cd Length: 880 Bit Score: 47.73 E-value: 7.67e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   335 LEDEQQQLEKKLpvtfedkkrenfERGN--LELEKRRQALLEQQRKEQERLAQlERAEQERKeRERQEQERKRQLELEKQ 412
Cdd:PRK02224  487 LEEEVEEVEERL------------ERAEdlVEAEDRIERLEERREDLEELIAE-RRETIEEK-RERAEELRERAAELEAE 552

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   413 LEKQRELerqreeerrkeierreAAKRELERQRQLEW--ERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKH 490
Cdd:PRK02224  553 AEEKREA----------------AAEAEEEAEEAREEvaELNSKLAELKERIESLERIRTLLAAIADAEDEIERLREKRE 616

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   491 QLEGKLQDIRCRLTTQRQEIestnksRELriaeithlqqqlqesqqmlgrlipEKQILNDQLKQVQQNslhrdslvtLKR 570
Cdd:PRK02224  617 ALAELNDERRERLAEKRERK------REL------------------------EAEFDEARIEEARED---------KER 657

                         250       260       270       280
                  ....*....|....*....|....*....|....*....|....
gi 47717123   571 ALEAKElarqHLRDQLDEVEkETRSKLQ-EIDIFNNQLKELREI 613
Cdd:PRK02224  658 AEEYLE----QVEEKLDELR-EERDDLQaEIGAVENELEELEEL 696

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding proteins; CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes including migration, chemotaxis, apoptosis, differentiation, and progenitor cell function. They mediate the signaling of integrins at focal adhesions where they localize, and thus, regulate cell invasion and survival. Over-expression of these proteins is implicated in poor prognosis, increased metastasis, and resistance to chemotherapeutics in many cancers such as breast, lung, melanoma, and glioblastoma. CAS proteins have also been linked to the pathogenesis of inflammatory disorders, Alzheimer's, Parkinson's, and developmental defects. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. Vertebrates contain four CAS proteins: BCAR1 (or p130Cas), NEDD9 (or HEF1), EFS (or SIN), and CASS4 (or HEPL). The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212778 Cd Length: 56 Bit Score: 41.95 E-value: 7.76e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQ----DMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11844    2 ARALYDNVAESPDELAFRRGDILTVLEQNtaglEGWWLCSLRGRQGIAPGNRLKL 56

Second Src Homology 3 domain (SH3B) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CIN85. SH3B has been shown to bind Cbl proline-rich peptides and ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212988 [Multi-domain] Cd Length: 53 Bit Score: 41.91 E-value: 8.23e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwVDEsqtgepGWLGGELKGKTGWFPANY 800
Cdd:cd12055    3 QVAFSYLPQNEDELELKVGDIIEVVGE-VEE------GWWEGVLNGKTGMFPSNF 50

Src Homology 3 domain of Membrane Protein, Palmitoylated 1 (or MAGUK p55 subfamily member 1)-like proteins; This subfamily includes MPP1, CASK (Calcium/calmodulin-dependent Serine protein Kinase), Caenorhabditis elegans lin-2, and similar proteins. MPP1 and CASK are scaffolding proteins from the MAGUK (membrane-associated guanylate kinase) protein family, which is characterized by the presence of a core of three domains: PDZ, SH3, and guanylate kinase (GuK). In addition, they also have the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. CASK and lin-2 also contain an N-terminal calmodulin-dependent kinase (CaMK)-like domain and two L27 domains. MPP1 is ubiquitously-expressed and plays roles in regulating neutrophil polarity, cell shape, hair cell development, and neural development and patterning of the retina. CASK is highly expressed in the mammalian nervous system and plays roles in synaptic protein targeting, neural development, and gene expression regulation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212968 Cd Length: 62 Bit Score: 42.03 E-value: 8.37e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1160 VIGMYDYTAQNDD-------ELAFNKGQIINVLNKEDPDWWKGEV----NGQVGLFPS 1206
Cdd:cd12035    2 VRAQFDYDPSKDDlipcqqaGIAFKTGDILQIISKDDHNWWQARKpgasKEPAGLIPS 59

Src homology 3 domain of the Rho guanine nucleotide exchange factor, ephexin-1 (also called NGEF or ARHGEF27); Ephexin-1, also called NGEF (neuronal GEF) or ARHGEF27, activates RhoA, Tac1, and Cdc42 by exchanging bound GDP for free GTP. It is expressed mainly in the brain in a region associated with movement control. It regulates the stability of postsynaptic acetylcholine receptor (AChR) clusters and thus, plays a critical role in the maturation and neurotransmission of neuromuscular junctions. Ephexin-1 directly interacts with the ephrin receptor EphA4 and their coexpression enhances the ability of ephexin-1 to activate RhoA. It is required for normal axon growth and EphA-induced growth cone collapse. Ephexin-1 contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212872 [Multi-domain] Cd Length: 55 Bit Score: 41.85 E-value: 8.55e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGEV--QGQKGWFPKSYVK 967
Cdd:cd11939    1 QVQCVHPYVSQEPDELSLELADVLNILDKtDDGWIFGERlhDQERGWFPSSVVE 54

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 47.76 E-value: 8.66e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    328 RLPEEPVLEDEQQQLEKKLPVTFEDKK--RENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERE---RQEQE 402
Cdd:TIGR02169  824 LTLEKEYLEKEIQELQEQRIDLKEQIKsiEKEIENLNGKKEELEEELEELEAALRDLESRLGDLKKERDELEaqlRELER 903

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    403 RKRQLELEKQLEKQrelerqreeerrkeIERREAAKRELERQRQLEWERNRRQELlnQRNKEQEDIVVLKAKKKTLEFEL 482
Cdd:TIGR02169  904 KIEELEAQIEKKRK--------------RLSELKAKLEALEEELSEIEDPKGEDE--EIPEEELSLEDVQAELQRVEEEI 967

                          170       180       190       200       210
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123    483 EALND------------KKHQLEgkLQDIRCRLTTQRQEIestnksrELRIAEIT 525
Cdd:TIGR02169  968 RALEPvnmlaiqeyeevLKRLDE--LKEKRAKLEEERKAI-------LERIEEYE 1013

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 41.71 E-value: 8.70e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1080 QVIA--SYTATGPEQLTLAPGQLILIRKKNPGGWWEGelQARGKkrqIGWFPANYVK 1134
Cdd:cd12046    1 QVVAlfSYEASQPEDLEFQKGDVILVLSKVNEDWLEG--QCKGK---IGIFPSAFVE 52

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 1; ASAP1 is also called DDEF1 (Development and Differentiation Enhancing Factor 1), AMAP1, centaurin beta-4, or PAG2. an Arf GTPase activating protein (GAP) with activity towards Arf1 and Arf5 but not Arf6. However, it has been shown to bind GTP-Arf6 stably without GAP activity. It has been implicated in cell growth, migration, and survival, as well as in tumor invasion and malignancy. It binds paxillin and cortactin, two components of invadopodia which are essential for tumor invasiveness. It also binds focal adhesion kinase (FAK) and the SH2/SH3 adaptor CrkL. ASAP1 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212898 [Multi-domain] Cd Length: 57 Bit Score: 41.92 E-value: 8.87e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1010 MYTYESSEQGDLTFQQGDVILVT-KKDGDWWTGTVG---DKAGVFPSNYVRL 1057
Cdd:cd11965    5 IYDCQADNDDELTFVEGEVIIVTgEEDQEWWIGHIEgqpERKGVFPVSFVHI 56

First Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the first C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212845 [Multi-domain] Cd Length: 55 Bit Score: 41.83 E-value: 9.08e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWW----KGevNGQVGLFPSNYVKL 1211
Cdd:cd11912    5 LYDYTASGDDEVSISEGEEVTVLEPDDGSGWtkvrNG--SGEEGLVPTSYIEI 55

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRB2 binds to Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, as well as to the proline-rich C-terminus of FGRF2. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212882 [Multi-domain] Cd Length: 53 Bit Score: 41.75 E-value: 9.17e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVkgewVDESqtgEPGWLGGELKGKTGWFPANY 800
Cdd:cd11949    1 YVQALFDFDPQEDGELGFRRGDFIEV----MDNS---DPNWWKGACHGQTGMFPRNY 50

Src Homology 3 domain of Class A and B Dedicator of Cytokinesis proteins; DOCK proteins are atypical guanine nucleotide exchange factors (GEFs) that lack the conventional Dbl homology (DH) domain. They are divided into four classes (A-D) based on sequence similarity and domain architecture: class A includes Dock1, 2 and 5; class B includes Dock3 and 4; class C includes Dock6, 7, and 8; and class D includes Dock9, 10 and 11. All DOCKs contain two homology domains: the DHR-1 (Dock homology region-1), also called CZH1 (CED-5, Dock180, and MBC-zizimin homology 1), and DHR-2 (also called CZH2 or Docker). The DHR-1 domain binds phosphatidylinositol-3,4,5-triphosphate while DHR-2 contains the catalytic activity for Rac and/or Cdc42. This subfamily includes only Class A and B DOCKs, which also contain an SH3 domain at the N-terminal region and a PxxP motif at the C-terminus. Class A/B DOCKs are mostly specific GEFs for Rac, except Dock4 which activates the Ras family GTPase Rap1, probably indirectly through interaction with Rap regulatory proteins. The SH3 domain of class A/B DOCKs have been shown to bind Elmo, a scaffold protein that promotes GEF activity of DOCKs by releasing DHR-2 autoinhibition by the intramolecular SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212805 [Multi-domain] Cd Length: 56 Bit Score: 41.80 E-value: 9.21e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1081 VIASYTATGPEQLTLAPGQLILIRKKNpGGWWEGELQarGKKRQIGWFPANYVKL 1135
Cdd:cd11872    4 AIYNFQGDGEHQLSLQVGDTVQILEEC-EGWYRGFSL--RNKSLKGIFPKSYVHI 55

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 41.55 E-value: 9.35e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11874    1 RCKVLFSYTPQNEDELELKVGDTIEVLGEvEEGWWEGKLNGKVGVFPSNFVKE 53

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase; GRAF, also called Rho GTPase activating protein 26 (ARHGAP26), Oligophrenin-1-like (OPHN1L) or GRAF1, is a GAP with activity towards RhoA and Cdc42 and is only weakly active towards Rac1. It influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase (FAK), which is a critical component of integrin signaling. It is essential for the major clathrin-independent endocytic pathway mediated by pleiomorphic membranes. GRAF contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212997 Cd Length: 56 Bit Score: 41.64 E-value: 9.40e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVmvkgEWVDESQtgEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd12064    4 KALYACKAEHDSELSFTAGTVF----DNVHPSQ--EPGWLEGTLNGKTGLIPENYVE 54

Src homology 3 domain of Lck Protein Tyrosine Kinase; Lck is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lck is expressed in T-cells and natural killer cells. It plays a critical role in T-cell maturation, activation, and T-cell receptor (TCR) signaling. Lck phosphorylates ITAM (immunoreceptor tyr activation motif) sequences on several subunits of TCRs, leading to the activation of different second messenger cascades. Phosphorylated ITAMs serve as binding sites for other signaling factor such as Syk and ZAP-70, leading to their activation and propagation of downstream events. In addition, Lck regulates drug-induced apoptosis by interfering with the mitochondrial death pathway. The apototic role of Lck is independent of its primary function in T-cell signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212938 [Multi-domain] Cd Length: 54 Bit Score: 41.73 E-value: 9.42e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGDWWTG---TVGDKaGVFPSNYV 1055
Cdd:cd12005    3 VALYSYEPSHDGDLGFEKGEKLRILEQSGEWWKAqslTTGQE-GFIPFNFV 52

Coiled-coil domain-containing protein 3; This family is found in eukaryotes; it has several conserved tryptophan residues. The function is not known.

Pssm-ID: 464032 [Multi-domain] Cd Length: 221 Bit Score: 45.47 E-value: 9.52e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    366 EKRRQALLEQQRKEQERLAQLERAEQ-ERKERERQEQ--ERKRQLELEKQLEKQRELERQREEERRKEIERREAAkrELE 442
Cdd:pfam13904   63 AKQRQRQKELQAQKEEREKEEQEAELrKRLAKEKYQEwlQRKARQQTKKREESHKQKAAESASKSLAKPERKVSQ--EEA 140

                           90       100       110       120
                   ....*....|....*....|....*....|....*....|....*....
gi 47717123    443 RQRQLEWERNRRQELLNQRNKEQEDivvlKAKKKTLEFELEALNDKKHQ 491
Cdd:pfam13904  141 KEVLQEWERKKLEQQQRKREEEQRE----QLKKEEEEQERKQLAEKAWQ 185

Src Homology 3 domain of C-terminal Src kinase; CSK is a cytoplasmic (or nonreceptor) tyr kinase containing the Src homology domains, SH3 and SH2, N-terminal to the catalytic tyr kinase domain. They negatively regulate the activity of Src kinases that are anchored to the plasma membrane. To inhibit Src kinases, CSK is translocated to the membrane via binding to specific transmembrane proteins, G-proteins, or adaptor proteins near the membrane. CSK catalyzes the tyr phosphorylation of the regulatory C-terminal tail of Src kinases, resulting in their inactivation. It is expressed in a wide variety of tissues and plays a role, as a regulator of Src, in cell proliferation, survival, and differentiation, and consequently, in cancer development and progression. In addition, CSK also shows Src-independent functions. It is a critical component in G-protein signaling, and plays a role in cytoskeletal reorganization and cell migration. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212703 [Multi-domain] Cd Length: 57 Bit Score: 41.52 E-value: 9.69e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1004 GEEFIAMYTYESSEQGDLTFQQGDVILVTK--KDGDWWTG-TVGDKAGVFPSNYV 1055
Cdd:cd11769    1 GTECIAKYNFNGASEEDLPFKKGDILTIVAvtKDPNWYKAkNKDGREGMIPANYV 55

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 41.73 E-value: 9.87e-05

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1077 EIAQVIASYTATGPEQLTLAPGQLILIRKKNPG--GWWEGELQarGKKrqiGWFPANYVKL 1135
Cdd:cd12056    2 EYCKALFHYEGTNEDELDFKEGEIILIISKDTGepGWWKGELN--GKE---GVFPDNFVSQ 57

Second Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212857 Cd Length: 56 Bit Score: 41.87 E-value: 9.93e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVG--DKAGVFPSNYVRL 1057
Cdd:cd11924    2 EAVAQYTFKGDLEVELSFRKGEHIcLIRKVNENWYEGRITgtGRQGIFPASYVQV 56

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Neural precursor cell Expressed, Developmentally Down-regulated 9; NEDD9 is also called human enhancer of filamentation 1 (HEF1) or CAS-L (Crk-associated substrate in lymphocyte). It was first described as a gene predominantly expressed in early embryonic brain, and was also isolated from a screen of human proteins that regulate filamentous budding in yeast, and as a tyrosine phosphorylated protein in lymphocytes. It promotes metastasis in different solid tumors. NEDD9 localizes in focal adhesions and associates with FAK and Abl kinase. It also interacts with SMAD3 and the proteasomal machinery which allows its rapid turnover; these interactions are not shared by other CAS proteins. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212935 Cd Length: 57 Bit Score: 41.89 E-value: 9.94e-05

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKED---PDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd12002    5 LYDNVPECAEELAFRKGDILTVIEQNTgglEGWWLCSLHGRQGIAPGNRLKL 56

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Embryonal Fyn-associated Substrate; EFS is also called HEFS, CASS3 (Cas scaffolding protein family member 3) or SIN (Src-interacting protein). It was identified based on interactions with the Src kinases, Fyn and Yes. It plays a role in thymocyte development and acts as a negative regulator of T cell proliferation. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212936 Cd Length: 62 Bit Score: 41.80 E-value: 9.94e-05

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM----WWFGEVQGQKGWFPKSYVKLI-SGP 972
Cdd:cd12003    3 AKALYDNAAESPEELSFRRGDVLMVLKREHGslpgWWLCSLHGQQGIAPANRLRLLpTAP 62

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 47.37 E-value: 1.01e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   353 KKRENFERGNLELEKRRQALLEQQRKEQERLAQLERA-EQERKERERQEQERKRQLELEKQLEKqRELERQREEERRKei 431
Cdd:PRK03918  186 KRTENIEELIKEKEKELEEVLREINEISSELPELREElEKLEKEVKELEELKEEIEELEKELES-LEGSKRKLEEKIR-- 262

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   432 erreaakrELERQRQlewERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQdircRLTTQRQEIE 511
Cdd:PRK03918  263 --------ELEERIE---ELKKEIEELEEKVKELKELKEKAEEYIKLSEFYEEYLDELREIEKRLS----RLEEEINGIE 327

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   512 STNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQL-KQVQQNSLHRD----SLVTLKRALEAKELARQHLRDQL 586
Cdd:PRK03918  328 ERIKELEEKEERLEELKKKLKELEKRLEELEERHELYEEAKaKKEELERLKKRltglTPEKLEKELEELEKAKEEIEEEI 407

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   587 DEVEKETRSKLQEIDIFNNQLKELREIHNKQQL--------QKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDK 658
Cdd:PRK03918  408 SKITARIGELKKEIKELKKAIEELKKAKGKCPVcgrelteeHRKELLEEYTAELKRIEKELKEIEEKERKLRKELRELEK 487

                         330       340       350
                  ....*....|....*....|....*....|
gi 47717123   659 QwlehVQQEDEHQRPRKLHE-----EEKLK 683
Cdd:PRK03918  488 V----LKKESELIKLKELAEqlkelEEKLK 513

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the third SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212714 [Multi-domain] Cd Length: 55 Bit Score: 41.52 E-value: 1.01e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF---GEVQGQKGWFPKSYVK 967
Cdd:cd11780    3 RALYSYTPQNEDELELREGDIVYVMEKCDDGWFvgtSERTGLFGTFPGNYVA 54

Src Homology 3 domain of Epidermal growth factor receptor kinase substrate 8 and similar proteins; This group is composed of Eps8 and Eps8-like proteins including Eps8-like 1-3, among others. These proteins contain N-terminal Phosphotyrosine-binding (PTB), central SH3, and C-terminal effector domains. Eps8 binds either Abi1 (also called E3b1) or Rab5 GTPase activating protein RN-tre through its SH3 domain. With Abi1 and Sos1, it becomes part of a trimeric complex that is required to activate Rac. Together with RN-tre, it inhibits the internalization of EGFR. The SH3 domains of Eps8 and similar proteins recognize peptides containing a PxxDY motif, instead of the classical PxxP motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212698 [Multi-domain] Cd Length: 54 Bit Score: 41.48 E-value: 1.03e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDpDWWKGE-VNGQVGLFPSN 1207
Cdd:cd11764    5 LYDFTARNSKELSVLKGEYLEVLDDSR-QWWKVRnSRGQVGYVPHN 49

Coiled-coil domain-containing protein 3; This family is found in eukaryotes; it has several conserved tryptophan residues. The function is not known.

Pssm-ID: 464032 [Multi-domain] Cd Length: 221 Bit Score: 45.47 E-value: 1.03e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    550 DQLKQVQQNSLHRDSLVT------LKRALEAKELARQHLRDQLDEVEKETRSKLqeidifnNQLKELREIHNKQQLQKQK 623
Cdd:pfam13904   39 TYARKLEGLKLERQPLEAyenwlaAKQRQRQKELQAQKEEREKEEQEAELRKRL-------AKEKYQEWLQRKARQQTKK 111

                           90       100       110       120       130       140
                   ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 47717123    624 SMEaeRLKQKEQERKIIELEKQ-KEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKREE 686
Cdd:pfam13904  112 REE--SHKQKAAESASKSLAKPeRKVSQEEAKEVLQEWERKKLEQQQRKREEEQREQLKKEEEE 173

Fourth Src homology 3 domain (or SH3D) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212927 Cd Length: 59 Bit Score: 41.84 E-value: 1.04e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQG-----QKGWFPKSYVKLI 969
Cdd:cd11994    2 AQVTTAYVASGVEQLSLSPGQLILILKKNSSgWWLGELQArgkkrQKGWFPASHVKLL 59

Second Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the second SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213010 Cd Length: 54 Bit Score: 41.56 E-value: 1.08e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123  923 PWRAKKDNHLNFNKNDVITVLEQQ-DMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd12077    8 PYTSQGKDEIGFEKGVTVEVIQKNlEGWWYIRYLGKEGWAPASYLK 53

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF5 and ARHGEF19; ARHGEF5, also called ephexin-3 or TIM (Transforming immortalized mammary oncogene), is a potent activator of RhoA and it plays roles in regulating cell shape, adhesion, and migration. It binds to the SH3 domain of Src and is involved in regulating Src-induced podosome formation. ARHGEF19, also called ephexin-2 or WGEF (weak-similarity GEF), is highly expressed in the intestine, liver, heart and kidney. It activates RhoA, Cdc42, and Rac 1, and has been shown to activate RhoA in the Wnt-PCP (planar cell polarity) pathway. It is involved in the regulation of cell polarity and cytoskeletal reorganization. ARHGEF5 and ARHGEF19 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212873 Cd Length: 55 Bit Score: 41.70 E-value: 1.09e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1080 QVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGelqARGKKRQIGWFPANYVKL 1135
Cdd:cd11940    3 QCIRSYKAQENDELTLEKADIIMVRQQSSDGWLEG---VRLSDGERGWFPQSHVEE 55

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 41.42 E-value: 1.10e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123  922 YPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVK 967
Cdd:cd12052    6 FDYKAQHEDELTITVGDIITKIKKDDGgWWEGEIKGRRGLFPDNFVR 52

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 41.54 E-value: 1.13e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVkgewVDESQTgepGWLGGELKGKTGWFPANY 800
Cdd:cd11963    5 RALYDFEAVEDNELTFKHGEIIIV----LDDSDA---NWWKGENHRGVGLFPSNF 52

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 3 (Stac3); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212919 [Multi-domain] Cd Length: 53 Bit Score: 41.43 E-value: 1.17e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVkgewVDESQTgepGWLGGELKGKTGWFPANY 800
Cdd:cd11986    1 YFVALYRFKALEKDDLDFHPGERITV----IDDSNE---EWWRGKIGEKTGYFPMNF 50

Second Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the second C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212712 [Multi-domain] Cd Length: 51 Bit Score: 41.33 E-value: 1.18e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKD-GDWWT-GTVGDKAGVFPSNY 1054
Cdd:cd11778    4 ALYDYEAQGDDEISIRVGDRIAVIRGDdGSGWTyGEINGVKGLFPTSY 51

Src Homology 3 domain of Sorting nexin 18; SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. It binds FIP5 and is required for apical lumen formation. It may also play a role in axonal elongation. SNXs are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNX18 also contains BAR and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212830 [Multi-domain] Cd Length: 55 Bit Score: 41.52 E-value: 1.18e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVN--GQVGLFPSNYVKL 1211
Cdd:cd11897    5 LYDFRSENPGEISLREHEVLSLCSEQDIEGWLEGVNsrGDRGLFPASYVEV 55

First C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212895 [Multi-domain] Cd Length: 54 Bit Score: 41.32 E-value: 1.19e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGElqarGKKRQIGWFPANYVKL 1135
Cdd:cd11962    2 AVVLYDYEKDEDNEIELVEGEIVTNIEMVDEDWWMGT----NSKGESGLFPSNYVEL 54

Trichohyalin-plectin-homology domain; This family is a mixtrue of two different families of eukaryotic proteins. Trichoplein or mitostatin, was first defined as a meiosis-specific nuclear structural protein. It has since been linked with mitochondrial movement. It is associated with the mitochondrial outer membrane, and over-expression leads to reduction in mitochondrial motility whereas lack of it enhances mitochondrial movement. The activity appears to be mediated through binding the mitochondria to the actin intermediate filaments (IFs). The family is in the trichohyalin-plectin-homology domain.

Pssm-ID: 464007 [Multi-domain] Cd Length: 341 Bit Score: 46.07 E-value: 1.22e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    336 EDEQQQLEKKLpvtfedKKRENFERGNLE--LEKRRQALLEQQRKEQERLAQLER-AEQERKERERQEQERKRQLELEKQ 412
Cdd:pfam13868  221 QKEREEAEKKA------RQRQELQQAREEqiELKERRLAEEAEREEEEFERMLRKqAEDEEIEQEEAEKRRMKRLEHRRE 294

                           90       100       110       120
                   ....*....|....*....|....*....|....*....|....*
gi 47717123    413 LEKQRELERQREEERRKEIERREAAKRELERQRQLEWERNRRQEL 457
Cdd:pfam13868  295 LEKQIEEREEQRAAEREEELEEGERLREEEAERRERIEEERQKKL 339

Second Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212856 [Multi-domain] Cd Length: 57 Bit Score: 41.44 E-value: 1.23e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNG--QVGLFPSNYVKL 1211
Cdd:cd11923    2 EAVAKYNFNADTNVELSLRKGDRVVLLKQVDQNWYEGKIPGtnRQGIFPVSYVEV 56

phosphodiesterase; Provisional

Pssm-ID: 237177 [Multi-domain] Cd Length: 520 Bit Score: 46.69 E-value: 1.24e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   363 LELEKRRQALLEQQRKEQE---RLAQLERAEQERKERERQEQE-RKRQLELEKQLekqrelerqreeerrkeierreaaK 438
Cdd:PRK12704   34 KEAEEEAKRILEEAKKEAEaikKEALLEAKEEIHKLRNEFEKElRERRNELQKLE------------------------K 89

                          90       100       110       120       130       140       150
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 47717123   439 RELERQRQLEwernRRQELLNQRNKEqedivvLKAKKKTLEFELEALNDKKHQLEGKLQDircrlttQRQEIES 512
Cdd:PRK12704   90 RLLQKEENLD----RKLELLEKREEE------LEKKEKELEQKQQELEKKEEELEELIEE-------QLQELER 146

First or N-terminal Src homology 3 domain of the p47phox subunit of NADPH oxidase, also called Neutrophil Cytosolic Factor 1; p47phox, or NCF1, is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox), which plays a key role in the ability of phagocytes to defend against bacterial infections. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p47phox is required for activation of NADH oxidase and plays a role in translocation. It contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), a polybasic/autoinhibitory region, and a C-terminal proline-rich region (PRR). This model characterizes the first SH3 domain (or N-SH3) of p47phox. In its inactive state, the tandem SH3 domains interact intramolecularly with the autoinhibitory region; upon activation, the tandem SH3 domains are exposed through a conformational change, resulting in their binding to the PRR of p22phox and the activation of NADPH oxidase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212954 [Multi-domain] Cd Length: 53 Bit Score: 41.48 E-value: 1.27e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1080 QVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGkkrqiGWFPANYVK 1134
Cdd:cd12021    3 RAIADYEKSSKSEMALKTGDVVEVVEKSENGWWFCQLKAKR-----GWVPASYLE 52

Fourth Src homology 3 domain (or SH3D) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212927 Cd Length: 59 Bit Score: 41.46 E-value: 1.28e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1166 YTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNG-----QVGLFPSNYVKL 1211
Cdd:cd11994    8 YVASGVEQLSLSPGQLILILKKNSSGWWLGELQArgkkrQKGWFPASHVKL 58

C2 domain present in Phosphatidylserine decarboxylase (PSD); PSD is involved in the biosynthesis of aminophospholipid by converting phosphatidylserine (PtdSer) to phosphatidylethanolamine (PtdEtn). There is a single C2 domain present and it is thought to confer PtdSer binding motif that is common to PKC and synaptotagmin. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176004 [Multi-domain] Cd Length: 108 Bit Score: 43.01 E-value: 1.31e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1619 PYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEV-LCITVFERDQFSPDDFLGRTEIRVADIKKDQGSKGPVTK 1697
Cdd:cd04039   28 PFVIISFGRRVFRTSWRRHTLNPVFNERLAFEVYPHEKNFdIQFKVLDKDKFSFNDYVATGSLSVQELLNAAPQPDPETG 107

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 41.16 E-value: 1.37e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPG-GWWEGElQARGKkrqIGWFPANYV 1133
Cdd:cd11763    2 VRALYDFDSQPSGELSLRAGEVLTITRQDVGdGWLEGR-NSRGE---VGLFPSSYV 53

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. Its N-terminal SH3 domain binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212879 [Multi-domain] Cd Length: 56 Bit Score: 41.16 E-value: 1.38e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDV--ILVTKKDGDWWTGTVGDKAGVFPSNYVRLK 1058
Cdd:cd11946    2 EAIAKYDFKATADDELSFKRGDIlkVLNEECDQNWYKAELNGKDGFIPKNYIEMK 56

C2 domain in Protein Kinase C (PKC) epsilon; A single C2 domain is found in PKC epsilon. The PKC family of serine/threonine kinases regulates apoptosis, proliferation, migration, motility, chemo-resistance, and differentiation. There are 3 groups: group 1 (alpha, betaI, beta II, gamma) which require phospholipids and calcium, group 2 (delta, epsilon, theta, eta) which do not require calcium for activation, and group 3 (xi, iota/lambda) which are atypical and can be activated in the absence of diacylglycerol and calcium. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members here have a type-II topology.

Pssm-ID: 175981 [Multi-domain] Cd Length: 132 Bit Score: 43.42 E-value: 1.42e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCR-----SHGKSN-----PYCEVTMgSQCHI--TKTIQDTLNPKWNsncQFFIRDLEQ-EVLCIT 1662
Cdd:cd04014    4 GTLKIKICEAVDLKPTDwstrhAVPKKGsqlldPYVSIDV-DDTHIgkTSTKPKTNSPVWN---EEFTTEVHNgRNLELT 79

                         90       100       110       120       130
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1663 VFERDQFSPDDFLGRTEIRVADIKKDQGSKgpvtKCLLLHEVPTGEIVVRLDLQ 1716
Cdd:cd04014   80 VFHDAAIGPDDFVANCTISFEDLIQRGSGS----FDLWVDLEPQGKLHVKIELK 129

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 41.11 E-value: 1.42e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  746 RALYPFESRSHDEITIQPGDIVmvkgewvDESQTGEPGWLGGELKGKTGWFPANYAEKI 804
Cdd:cd12054    4 KVLFEYVPQNEDELELKVGDII-------DINEEVEEGWWSGTLNGKSGLFPSNFVKEL 55

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 41.53 E-value: 1.46e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQKGWFPKSYVKLISGP 972
Cdd:cd11972    7 AIYDYTKDKEDELSFQEGAIIYVIKKNDDGWYeGVMNGVTGLFPGNYVESIMHY 60

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 41.17 E-value: 1.49e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1011 YTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11901    8 FNYTAEREDELSLVKGTKVIVMEKCSDgWWRGSYNGQVGWFPSNYV 53

Src homology 3 domain of Brk (Breast tumor kinase) Protein Tyrosine Kinase (PTK), also called PTK6; Brk is a cytoplasmic (or non-receptor) PTK with limited homology to Src kinases. It has been found to be overexpressed in a majority of breast tumors. It plays roles in normal cell differentiation, proliferation, survival, migration, and cell cycle progression. Brk substrates include RNA-binding proteins (SLM-1/2, Sam68), transcription factors (STAT3/5), and signaling molecules (Akt, paxillin, IRS-4). Src kinases in general contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr; they are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation site. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212781 [Multi-domain] Cd Length: 58 Bit Score: 41.39 E-value: 1.50e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDpDWW----KGEVNGQV--GLFPSNYV 1209
Cdd:cd11847    3 KALWDFKARGDEELSFQAGDQFRIAERSG-DWWtalkLDRAGGVVaqGFVPNNYL 56

Src Homology 3 domain of Nephrocystin (or Nephrocystin-1); Nephrocystin contains an SH3 domain involved in signaling pathways that regulate cell adhesion and cytoskeletal organization. It is a protein that in humans is associated with juvenile nephronophthisis, an inherited kidney disease characterized by renal fibrosis that lead to chronic renal failure in children. It is localized in cell-cell junctions in renal duct cells, and is known to interact with Ack1, an activated Cdc42-associated kinase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212704 [Multi-domain] Cd Length: 54 Bit Score: 41.14 E-value: 1.51e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLE-QQDMWWFGE-VQGQKGWFPKSYVKL 968
Cdd:cd11770    4 ALSDFQAEQEGDLSFKKGEVLRIISkRADGWWLAEnSKGNRGLVPKTYLKV 54

First Src Homology 3 domain of Bud emergence protein 1 and similar domains; Members of this subfamily bear similarity to Saccharomyces cerevisiae Bem1p, containing two Src Homology 3 (SH3) domains at the N-terminus, a central PX domain, and a C-terminal PB1 domain. Bem1p is a scaffolding protein that is critical for proper Cdc42p activation during bud formation in yeast. During budding and mating, Bem1p migrates to the plasma membrane where it can serve as an adaptor for Cdc42p and some other proteins. Bem1p also functions as an effector of the G1 cyclin Cln3p and the cyclin-dependent kinase Cdc28p in promoting vacuolar fusion. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212811 [Multi-domain] Cd Length: 54 Bit Score: 41.12 E-value: 1.56e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPD-WWKGE--VNGQVGLFPSNY 1208
Cdd:cd11878    6 YDYRAQTPGELSFSKGDFFHVIGEEDQGeWYEATnpVTGKRGLVPKSY 53

Src Homology 3 domain of Membrane Protein, Palmitoylated 7 (or MAGUK p55 subfamily member 7); MPP7 is a scaffolding protein that binds to DLG1 and promotes tight junction formation and epithelial cell polarity. Mutations in the MPP7 gene may be associated with the pathogenesis of diabetes and extreme bone mineral density. It is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212966 Cd Length: 61 Bit Score: 41.16 E-value: 1.61e-04

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1160 VIGMYDYTAQNDDE-------LAFNKGQIINVLNKEDPDWWK----GEVNGQVGLFPSNY 1208
Cdd:cd12033    2 IKALFDYNPNEDKAipckeagLSFKKGDILQIMSQDDATWWQakheGDANPRAGLIPSKH 61

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 41.13 E-value: 1.61e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1084 SYTATGPEQLTLAPGQLILIRKKNPGGWWEGELqaRGKKrqiGWFPANYV 1133
Cdd:cd11772    7 DYEAQHPDELSFEEGDLLYISDKSDPNWWKATC--GGKT---GLIPSNYV 51

Src Homology 3 domain of Class A and B Dedicator of Cytokinesis proteins; DOCK proteins are atypical guanine nucleotide exchange factors (GEFs) that lack the conventional Dbl homology (DH) domain. They are divided into four classes (A-D) based on sequence similarity and domain architecture: class A includes Dock1, 2 and 5; class B includes Dock3 and 4; class C includes Dock6, 7, and 8; and class D includes Dock9, 10 and 11. All DOCKs contain two homology domains: the DHR-1 (Dock homology region-1), also called CZH1 (CED-5, Dock180, and MBC-zizimin homology 1), and DHR-2 (also called CZH2 or Docker). The DHR-1 domain binds phosphatidylinositol-3,4,5-triphosphate while DHR-2 contains the catalytic activity for Rac and/or Cdc42. This subfamily includes only Class A and B DOCKs, which also contain an SH3 domain at the N-terminal region and a PxxP motif at the C-terminus. Class A/B DOCKs are mostly specific GEFs for Rac, except Dock4 which activates the Ras family GTPase Rap1, probably indirectly through interaction with Rap regulatory proteins. The SH3 domain of class A/B DOCKs have been shown to bind Elmo, a scaffold protein that promotes GEF activity of DOCKs by releasing DHR-2 autoinhibition by the intramolecular SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212805 [Multi-domain] Cd Length: 56 Bit Score: 41.03 E-value: 1.61e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGDWWTG-TVGDKA--GVFPSNYVRLK 1058
Cdd:cd11872    3 VAIYNFQGDGEHQLSLQVGDTVQILEECEGWYRGfSLRNKSlkGIFPKSYVHIK 56

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212849 [Multi-domain] Cd Length: 59 Bit Score: 41.13 E-value: 1.64e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF---GEVQGQKGWFPKSYVKLI 969
Cdd:cd11916    5 QALYSYAPQNDDELELRDGDIVDVMEKCDDGWFvgtSRRTKQFGTFPGNYVKLL 58

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 40.96 E-value: 1.65e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1011 YTYESSEQGdLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11829    8 FTGEQHQQG-LSFEAGELIRVLQApDGGWWEGEKDGLRGWFPASYV 52

C2 domain present in Calpain proteins; A single C2 domain is found in calpains (EC 3.4.22.52, EC 3.4.22.53), calcium-dependent, non-lysosomal cysteine proteases. Caplains are classified as belonging to Clan CA by MEROPS and include six families: C1, C2, C10, C12, C28, and C47. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176011 [Multi-domain] Cd Length: 126 Bit Score: 43.04 E-value: 1.67e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1600 VNVVEGIELKPCRSHGKSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLcITVFERDQFSpDDFLGRTE 1679
Cdd:cd04046    7 VHVHSAEGLSKQDSGGGADPYVIIKCEGESVRSPVQKDTLSPEFDTQAIFYRKKPRSPIK-IQVWNSNLLC-DEFLGQAT 84


                 .
gi 47717123 1680 I 1680
Cdd:cd04046   85 L 85

Src homology 3 domain of Src kinase-like Protein Tyrosine Kinases; Src subfamily members include Src, Lck, Hck, Blk, Lyn, Fgr, Fyn, Yrk, Yes, and Brk. Src (or c-Src) proteins are cytoplasmic (or non-receptor) PTKs which are anchored to the plasma membrane. They contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation sites. Src proteins are involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. They were identified as the first proto-oncogene products, and they regulate cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Src kinases are overexpressed in a variety of human cancers, making them attractive targets for therapy. They are also implicated in acute inflammatory responses and osteoclast function. Src, Fyn, Yes, and Yrk are widely expressed, while Blk, Lck, Hck, Fgr, Lyn, and Brk show a limited expression pattern. This subfamily also includes Drosophila Src42A, Src oncogene at 42A (also known as Dsrc41) which accumulates at sites of cell-cell or cell-matrix adhesion, and participates in Drosphila development and wound healing. It has been shown to promote tube elongation in the tracheal system, is essential for proper cell-cell matching during dorsal closure, and regulates cell-cell contacts in developing Drosophila eyes. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212779 [Multi-domain] Cd Length: 52 Bit Score: 41.03 E-value: 1.69e-04

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMV----KGEWvdesqtgepgWLGGELK-GKTGWFPANY 800
Cdd:cd11845    2 YVALYDYEARTDDDLSFKKGDRLQIlddsDGDW----------WLARHLStGKEGYIPSNY 52

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 40.94 E-value: 1.70e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVKGEWVDEsqtgepgWLGGELKGKTGWFPANYAE 802
Cdd:cd12046    4 ALFSYEASQPEDLEFQKGDVILVLSKVNED-------WLEGQCKGKIGIFPSAFVE 52

Third Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212718 Cd Length: 55 Bit Score: 40.92 E-value: 1.71e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVKGEWVDesqtgepGWLGGE--LKGKTGWFPANY 800
Cdd:cd11784    2 CVALHSYSAHRPEELELQKGEGVRVLGKFQE-------GWLRGLslVTGRVGIFPSNY 52

exonuclease SbcC; All proteins in this family for which functions are known are part of an exonuclease complex with sbcD homologs. This complex is involved in the initiation of recombination to regulate the levels of palindromic sequences in DNA. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

Pssm-ID: 129705 [Multi-domain] Cd Length: 1042 Bit Score: 46.50 E-value: 1.73e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    332 EPVLEDEQQQLEKKLPVTFEDKKRENFERGNLE-LEKRRQAL---LEQQRKEQERLAQL--ERAEQERKERERQeQERKR 405
Cdd:TIGR00618  541 ETSEEDVYHQLTSERKQRASLKEQMQEIQQSFSiLTQCDNRSkedIPNLQNITVRLQDLteKLSEAEDMLACEQ-HALLR 619

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    406 QLELEKQLEKQRELERQREEERRKEIERREAAKRELERQRQLE-WERNRRQEL------LNQRNKEQEDIVVLKAKKKTL 478
Cdd:TIGR00618  620 KLQPEQDLQDVRLHLQQCSQELALKLTALHALQLTLTQERVREhALSIRVLPKellasrQLALQKMQSEKEQLTYWKEML 699

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    479 EFELEALNDkKHQLEGKL----QDIRCRLTTQRQEI--------ESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQ 546
Cdd:TIGR00618  700 AQCQTLLRE-LETHIEEYdrefNEIENASSSLGSDLaaredalnQSLKELMHQARTVLKARTEAHFNNNEEVTAALQTGA 778

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    547 ILNDQLKQVQQNSLHRDSLVTLKRALEAKelARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELreiHNKQ-QLQKQKSM 625
Cdd:TIGR00618  779 ELSHLAAEIQFFNRLREEDTHLLKTLEAE--IGQEIPSDEDILNLQCETLVQEEEQFLSRLEEK---SATLgEITHQLLK 853

                          330       340
                   ....*....|....*....|....
gi 47717123    626 EAERLKQKEQ----ERKIIELEKQ 645
Cdd:TIGR00618  854 YEECSKQLAQltqeQAKIIQLSDK 877

Third Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212718 Cd Length: 55 Bit Score: 40.92 E-value: 1.73e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1081 VIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGKkrqIGWFPANYV 1133
Cdd:cd11784    4 ALHSYSAHRPEELELQKGEGVRVLGKFQEGWLRGLSLVTGR---VGIFPSNYV 53

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 40.84 E-value: 1.74e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGEVQGQKGWFPKSYV 966
Cdd:cd11806    4 AIADFVATDDSQLSFESGDKLLVLRKpSVDWWWAEHNGCCGYIPASHL 51

C2A domain first repeat present in Synaptotagmin 7; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Synaptotagmin 7, a member of class 2 synaptotagmins, is located in presynaptic plasma membranes in neurons, dense-core vesicles in endocrine cells, and lysosomes in fibroblasts. It has been shown to play a role in regulation of Ca2+-dependent lysosomal exocytosis in fibroblasts and may also function as a vesicular Ca2+-sensor. It is distinguished from the other synaptotagmins by having over 12 splice forms. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176032 [Multi-domain] Cd Length: 125 Bit Score: 43.09 E-value: 1.79e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1598 LMVNVVEGIELKPCRSHGKSNPYCEVTM---GSQCHITKTIQDTLNPKWNSNCQF--F-IRDLEQEVLCITVFERDQFSP 1671
Cdd:cd08386   18 LTLKILKAVELPAKDFSGTSDPFVKIYLlpdKKHKLETKVKRKNLNPHWNETFLFegFpYEKLQQRVLYLQVLDYDRFSR 97

                         90
                 ....*....|....*
gi 47717123 1672 DDFLGRTEIRVADIK 1686
Cdd:cd08386   98 NDPIGEVSLPLNKVD 112

Transcriptional activator LAG-3; The C.elegans Notch pathway, involved in the control of growth, differentiation and patterning in animal development, relies on either of the receptors GLP-1 or LIN-12. Both these receptors promote signalling by the recruitment of LAG-3 to target promoters, where it then acts as a transcriptional activator. LAG-3 works as a ternary complex together with the DNA binding protein, LAG-1. Its N-terminal region adopts an elongated kinked helix that is required for complex assembly.

Pssm-ID: 151935 [Multi-domain] Cd Length: 476 Bit Score: 46.11 E-value: 1.80e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    606 QLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQE--RDKQWLEHVQQEDE-----------HQR 672
Cdd:pfam11498  321 HIAQLAQQQNKMRLLQQQEMEMQRIEQQRQQQIMHQHQQQQQQEHQQQQMllQQQQQMHQLQQHHQmngggqfatqaHQH 400

                           90       100       110       120
                   ....*....|....*....|....*....|....*....|....*
gi 47717123    673 PRKLHEEEKLKREESVKKKDGEEKGKQEAQdklgrlfHQHQEPAK 717
Cdd:pfam11498  401 AAYLQQMQHMRLQEQIQHQQQQAQHHQQAQ-------QQHQQPAQ 438

Src Homology 3 domain of eumetazoan Peroxisomal biogenesis factor 13; PEX13 is a peroxin and is required for protein import into the peroxisomal matrix and membrane. It is an integral membrane protein that is essential for the localization of PEX14 and the import of proteins containing the peroxisome matrix targeting signals, PTS1 and PTS2. Mutations of the PEX13 gene in humans lead to a wide range of peroxisome biogenesis disorders (PBDs), the most severe of which is known as Zellweger syndrome (ZS), a severe multisystem disorder characterized by hypotonia, psychomotor retardation, and neuronal migration defects. PEX13 contains two transmembrane regions and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212798 Cd Length: 58 Bit Score: 41.08 E-value: 1.87e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwvdESQTGEPGWLGGELKG-KTGWFPANY 800
Cdd:cd11864    3 RAEYDFVAESEDELSFRAGDKLRLAPK---ELQPRVRGWLLATVDGqKIGLVPANY 55

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 1; Shank1, also called SSTRIP (Somatostatin receptor-interacting protein), is a brain-specific protein that plays a role in the construction of postsynaptic density (PSD) and the maturation of dendritic spines. Mice deficient in Shank1 show altered PSD composition, thinner PSDs, smaller dendritic spines, and weaker basal synaptic transmission, although synaptic plasticity is normal. They show increased anxiety and impaired fear memory, but also show better spatial learning. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212915 [Multi-domain] Cd Length: 52 Bit Score: 40.77 E-value: 1.90e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1082 IASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARgkkrqIGWFPANYV 1133
Cdd:cd11982    6 VKPYQSQAEGEISLSKGEKIKVLSVGEGGFWEGQVKGR-----VGWFPSDCV 52

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. Its N-terminal SH3 domain binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212879 [Multi-domain] Cd Length: 56 Bit Score: 40.78 E-value: 1.93e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVKGEWVDESqtgepgWLGGELKGKTGWFPANYAE 802
Cdd:cd11946    5 AKYDFKATADDELSFKRGDILKVLNEECDQN------WYKAELNGKDGFIPKNYIE 54

Src Homology 3 domain of Saccharomyces cerevisiae Nap1-binding protein 2 and similar fungal proteins; This subfamily includes Saccharomyces cerevisiae Nbp2 (Nucleosome assembly protein 1 (Nap1)-binding protein 2), Schizosaccharomyces pombe Skb5, and similar proteins. Nbp2 interacts with Nap1, which is essential for maintaining proper nucleosome structures in transcription and replication. It is also the binding partner of the yeast type II protein phosphatase Ptc1p and serves as a scaffolding protein that brings seven kinases in close contact to Ptc1p. Nbp2 plays a role many cell processes including organelle inheritance, mating hormone response, cell wall stress, mitotic cell growth at elevated temperatures, and high osmolarity. Skb5 interacts with the p21-activated kinase (PAK) homolog Shk1, which is critical for fission yeast cell viability. Skb5 activates Shk1 and plays a role in regulating cell morphology and growth under hypertonic conditions. Nbp2 and Skb5 contain an SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212799 Cd Length: 55 Bit Score: 40.96 E-value: 1.94e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWW--KGEVNGQVGLFPSNYVKL 1211
Cdd:cd11865    1 RAVALYDFEPEHDNELGFAEGQILFILYKHGQGWLiaEDESGGKTGLVPEEFVSY 55

First Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212852 [Multi-domain] Cd Length: 55 Bit Score: 40.72 E-value: 1.97e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwVDESqtgepgWLGGELKGKTGWFPANYAEKI 804
Cdd:cd11919    4 RAKFDFKAQTLKELPLQKGDIVYIYKQ-IDQN------WYEGEHHGRVGIFPRSYIELL 55

Src homology 3 domain of Slit-Robo GTPase Activating Proteins; Slit-Robo GTPase Activating Proteins (srGAPs) are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. Vertebrates contain three isoforms of srGAPs (srGAP1-3), all of which are expressed during embryonic and early development in the nervous system but with different localization and timing. A fourth member has also been reported (srGAP4, also called ARHGAP4). srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212743 [Multi-domain] Cd Length: 53 Bit Score: 40.85 E-value: 2.00e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11809    1 EATAQFDYTGRSERELSFKKGDSLTLYRQvSDDWWRGQLNGQDGLVPHKYITL 53

Src Homology 3 domain of Membrane Protein, Palmitoylated 5 (or MAGUK p55 subfamily member 5); MPP5, also called PALS1 (Protein associated with Lin7) or Nagie oko protein in zebrafish or Stardust in Drosophila, is a scaffolding protein which associates with Crumbs homolog 1 (CRB1), CRB2, or CRB3 through its PDZ domain and with PALS1-associated tight junction protein (PATJ) or multi-PDZ domain protein 1 (MUPP1) through its L27 domain. The resulting tri-protein complexes are core proteins of the Crumb complex, which localizes at tight junctions or subapical regions, and is involved in the maintenance of apical-basal polarity in epithelial cells and the morphogenesis and function of photoreceptor cells. MPP5 is critical for the proper stratification of the retina and is also expressed in T lymphocytes where it is important for TCR-mediated activation of NFkB. Drosophila Stardust exists in several isoforms, some of which show opposing functions in photoreceptor cells, which suggests that the relative ratio of different Crumbs complexes regulates photoreceptor homeostasis. MPP5 contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212969 Cd Length: 63 Bit Score: 40.86 E-value: 2.09e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1164 YDYTAQnDDE--------LAFNKGQIINVLNKEDPDWWK----GEVNGQ--VGLFPS 1206
Cdd:cd12036    6 FDYDPE-DDPyipcrelgLSFQKGDILHVISQEDPNWWQayreGEEDNQslAGLIPS 61

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 40.76 E-value: 2.10e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANYAEKI 804
Cdd:cd11920    4 RAVYDFKAQTSKELSFKKGDTVYI-------LRKIDQNWYEGEHHGRVGIFPISYVEKL 55

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor; ASEF, also called ARHGEF4, exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli). GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF can activate Rac1 or Cdc42. Truncated ASEF, which is found in colorectal cancers, is constitutively active and has been shown to promote angiogenesis and cancer cell migration. ASEF contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212906 [Multi-domain] Cd Length: 73 Bit Score: 41.16 E-value: 2.12e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKAGVFPSNYVRLK 1058
Cdd:cd11973   22 ALWDHVTMDDQELGFKAGDVIeVMDATNKEWWWGRVLDSEGWFPASFVRLR 72

Src homology 3 domain of Type I fungal Myosins; Type I myosins (myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Saccharomyces cerevisiae has two myosins-I, Myo3 and Myo5, which are involved in endocytosis and the polarization of the actin cytoskeleton. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212792 [Multi-domain] Cd Length: 55 Bit Score: 40.83 E-value: 2.13e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1085 YTATGPEQLTLAPGQLILIRKKNPGGWWegeLQARGKKRQIGWFPANYVKL 1135
Cdd:cd11858    8 FAGSVANELSLKKDDIVYIVQKEDNGWW---LAKKLDESKEGWVPAAYLEE 55

Src homology 3 domain of Src-Like Adaptor Protein 2; SLAP2 plays a role in c-Cbl-dependent regulation of CSF1R, a tyrosine kinase important for myeloid cell growth and differentiation. It has been shown to interact with CSF1R, c-Cbl, LAT, CD247, and Zap70. SLAPs are adaptor proteins with limited similarity to Src family tyrosine kinases. They contain an N-terminal SH3 domain followed by an SH2 domain, and a unique C-terminal sequence. They function in regulating the signaling, ubiquitination, and trafficking of T-cell receptor (TCR) and B-cell receptor (BCR) components. The SH3 domain of SLAP forms a complex with v-Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212944 Cd Length: 55 Bit Score: 40.50 E-value: 2.14e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTKKDGDWWT--GTVGDKAGVFPSNYV 1055
Cdd:cd12011    2 AVALCNFPSGGPTELSIRMGEQLTILSEDGDWWKvsSAVTGRECYIPSNYV 52

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Neural precursor cell Expressed, Developmentally Down-regulated 9; NEDD9 is also called human enhancer of filamentation 1 (HEF1) or CAS-L (Crk-associated substrate in lymphocyte). It was first described as a gene predominantly expressed in early embryonic brain, and was also isolated from a screen of human proteins that regulate filamentous budding in yeast, and as a tyrosine phosphorylated protein in lymphocytes. It promotes metastasis in different solid tumors. NEDD9 localizes in focal adhesions and associates with FAK and Abl kinase. It also interacts with SMAD3 and the proteasomal machinery which allows its rapid turnover; these interactions are not shared by other CAS proteins. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212935 Cd Length: 57 Bit Score: 40.74 E-value: 2.14e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQ----DMWWFGEVQGQKGWFPKSYVKLI 969
Cdd:cd12002    2 ARALYDNVPECAEELAFRKGDILTVIEQNtgglEGWWLCSLHGRQGIAPGNRLKLL 57

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 40.72 E-value: 2.19e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1009 AMYTYESSEQG-DLTFQQGDVILVTKK------DGDWWTGTVGD-KAGVFPSNYV 1055
Cdd:cd11771    4 ALYDFTPENPEmELSLKKGDIVAVLSKtdplgrDSEWWKGRTRDgRIGWFPSNYV 58

Second Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the second SH3 domain, located C-terminal of the first SH3 domain at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212865 Cd Length: 57 Bit Score: 40.59 E-value: 2.23e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1157 VCQVIGMYDY----TAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11932    1 LCRALYNFDLkeknREESKDCLKFQKDDIITVISRVDENWAEGKLGDQVGIFPILFV 57

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 40.76 E-value: 2.27e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11920    5 AVYDFKAQTSKELSFKKGDTVYILRKiDQNWYEGEHHGRVGIFPISYV 52

Src homology 3 domain of the Rho guanine nucleotide exchange factor ARHGEF9; ARHGEF9, also called PEM2 or collybistin, selectively activates Cdc42 by exchanging bound GDP for free GTP. It is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. Mutations in the ARHGEF9 gene cause X-linked mental retardation with associated features like seizures, hyper-anxiety, aggressive behavior, and sensory hyperarousal. ARHGEF9 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212908 Cd Length: 62 Bit Score: 40.85 E-value: 2.28e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1001 VVSGEefiAMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11975    4 IVSAE---AVWDHVTMANRELAFKAGDVIkVLDASNKDWWWGQIDDEEGWFPASFVRL 58

C-terminal Src Homology 3 domain of Nebulette and LIM-nebulette (or Lasp2); Nebulette is a cardiac-specific protein that localizes to the Z-disc. It interacts with tropomyosin and is important in stabilizing actin thin filaments in cardiac muscles. Polymorphisms in the nebulette gene are associated with dilated cardiomyopathy, with some mutations resulting in severe heart failure. Nebulette is a 107kD protein that contains an N-terminal acidic region, multiple nebulin repeats, and a C-terminal SH3 domain. LIM-nebulette, also called Lasp2 (LIM and SH3 domain protein 2), is an alternatively spliced variant of nebulette. Although it shares a gene with nebulette, Lasp2 is not transcribed from a muscle-specific promoter, giving rise to its multiple tissue expression pattern with highest amounts in the brain. It can crosslink actin filaments and it affects cell spreading. Lasp2 is a 34kD protein containing an N-terminal LIM domain, three nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212868 [Multi-domain] Cd Length: 58 Bit Score: 40.76 E-value: 2.32e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVIL-VTKKDGDWWTGTV--GDKAGVFPSNYVRL 1057
Cdd:cd11935    5 AMYDYSAQDEDEVSFRDGDYIVnVQPIDEGWMYGTVqrTGRTGMLPANYIEF 56

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 40.57 E-value: 2.40e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1085 YTATGPEQLTLAPGQLILIRKKNPGGWWEGELqarGKKRQiGWFPANYV 1133
Cdd:cd11812    8 YTANRSDELTIHRGDIIRVLYKDNDNWWFGSL---VNGQQ-GYFPANYV 52

Septal ring factor EnvC, activator of murein hydrolases AmiA and AmiB [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 443969 [Multi-domain] Cd Length: 377 Bit Score: 45.53 E-value: 2.47e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  335 LEDEQQQLEKKLPVTFEDKKRENFERGNLE-----LEKRRQALLEQQRKEQERLAQLERAEQE-RKERERQEQERKRQL- 407
Cdd:COG4942   32 LQQEIAELEKELAALKKEEKALLKQLAALErriaaLARRIRALEQELAALEAELAELEKEIAElRAELEAQKEELAELLr 111

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  408 --------------------------------------ELEKQLEKQRELERQREEERRKEIERREAAKRELERQRQ-LE 448
Cdd:COG4942  112 alyrlgrqpplalllspedfldavrrlqylkylaparrEQAEELRADLAELAALRAELEAERAELEALLAELEEERAaLE 191

                        170       180       190       200       210       220
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  449 WERNRRQELLNQrnkeqedivvLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSR 517
Cdd:COG4942  192 ALKAERQKLLAR----------LEKELAELAAELAELQQEAEELEALIARLEAEAAAAAERTPAAGFAA 250

Src Homology 3 domain of Tec (Tyrosine kinase expressed in hepatocellular carcinoma); Tec is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. It is more widely-expressed than other Tec subfamily kinases. Tec is found in endothelial cells, both B- and T-cells, and a variety of myeloid cells including mast cells, erythroid cells, platelets, macrophages and neutrophils. Tec is a key component of T-cell receptor (TCR) signaling, and is important in TCR-stimulated proliferation, IL-2 production and phospholipase C-gamma1 activation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212838 [Multi-domain] Cd Length: 56 Bit Score: 40.57 E-value: 2.49e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1077 EIAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWegelQARGKKRQIGWFPANYV 1133
Cdd:cd11905    1 EIVVAMYDFQPTEPHDLRLETGEEYVILEKNDVHWW----KARDKYGKEGYIPSNYV 53

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The N-terminal SH3 domain of GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212738 [Multi-domain] Cd Length: 52 Bit Score: 40.42 E-value: 2.49e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEWVDesqtgePGWLGGELKGKTGWFPANY 800
Cdd:cd11804    3 VAKHDFKATAEDELSFKKGSILKVLNMEDD------PNWYKAELDGKEGLIPKNY 51

C2 domain present in the putative elicitor-responsive gene; In plants elicitor-responsive proteins are triggered in response to specific elicitor molecules such as glycolproteins, peptides, carbohydrates and lipids. A host of defensive responses are also triggered resulting in localized cell death. Antimicrobial secondary metabolites, such as phytoalexins, or defense-related proteins, including pathogenesis-related (PR) proteins are also produced. There is a single C2 domain present here. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members have a type-II topology.

Pssm-ID: 176014 [Multi-domain] Cd Length: 124 Bit Score: 42.32 E-value: 2.57e-04

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1615 GKSNPYCEVTMGSQCHITKTIQDT-LNPKWNSNCQFFIRDLEQEV---LCITVFERDQFSPDDFLGRTEIRVADI 1685
Cdd:cd04049   20 GKIDPYVIIQCRTQERKSKVAKGDgRNPEWNEKFKFTVEYPGWGGdtkLILRIMDKDNFSDDDFIGEATIHLKGL 94

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53; IRSp53 is also known as BAIAP2 (Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2). It is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. One variant (T-form) is expressed exclusively in human breast cancer cells. The gene encoding IRSp53 is a putative susceptibility gene for Gilles de la Tourette syndrome. IRSp53 can also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. It contains an N-terminal IMD, a CRIB (Cdc42 and Rac interactive binding motif), an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The SH3 domain of IRSp53 has been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212848 Cd Length: 59 Bit Score: 40.77 E-value: 2.64e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  917 QAQALYPwRAKKDNH--LNFNKNDVITVL--EQQDMWWFGEVQGQK--GWFPKSYVKLI 969
Cdd:cd11915    2 RVQAIFS-HAAGDNStlLSFKEGDYITLLvpEARDGWHYGECEKTKmrGWFPFSYTRVL 59

Septal ring factor EnvC, activator of murein hydrolases AmiA and AmiB [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 443969 [Multi-domain] Cd Length: 377 Bit Score: 45.14 E-value: 2.65e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  337 DEQQQLEKKLpvtfedkkrenfERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQL-ELEKQLEK 415
Cdd:COG4942   20 DAAAEAEAEL------------EQLQQEIAELEKELAALKKEEKALLKQLAALERRIAALARRIRALEQELaALEAELAE 87

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  416 qreLERQreeerrkeierREAAKRELERQRQLEWERNRRQellnQRNKEQEDIVVLKAKKKTLEFE-----LEALNDKKH 490
Cdd:COG4942   88 ---LEKE-----------IAELRAELEAQKEELAELLRAL----YRLGRQPPLALLLSPEDFLDAVrrlqyLKYLAPARR 149

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  491 QLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEIthlqqqlqesQQMLGRLIPEKQILNDQLKQVQQNslhrdsLVTLKR 570
Cdd:COG4942  150 EQAEELRADLAELAALRAELEAERAELEALLAEL----------EEERAALEALKAERQKLLARLEKE------LAELAA 213

                        250       260
                 ....*....|....*....|....*.
gi 47717123  571 ALEAKELARQHLRDQLDEVEKETRSK 596
Cdd:COG4942  214 ELAELQQEAEELEALIARLEAEAAAA 239

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 40.38 E-value: 2.68e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKK---DGDWWTGTVGDKAGVFPSNYVrlkDSEG 1062
Cdd:cd11977    4 VARYNFAARDMRELSLREGDVVRIYSRiggDQGWWKGETNGRIGWFPSTYV---EEEG 58

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 40.76 E-value: 2.76e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANYAEKI 804
Cdd:cd11972    7 AIYDYTKDKEDELSFQEGAIIYV-------IKKNDDGWYEGVMNGVTGLFPGNYVESI 57

Second Src Homology 3 domain of FCH and double SH3 domains protein 1; FCHSD1 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212828 Cd Length: 58 Bit Score: 40.33 E-value: 2.76e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK-----DGDWWTGTVGDKAGVFPS 1052
Cdd:cd11895    4 ALYSYTGQSPEELSFPEGALIRLLPRaqdgvDDGFWRGEFGGRVGVFPS 52

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 40.43 E-value: 2.82e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVkgewVDEsqtGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd11824    2 YSVLYDYTAQEDDELSISKGDVVAV----IEK---GEDGWWTVERNGQKGLVPGTYLEK 53

exonuclease SbcC; All proteins in this family for which functions are known are part of an exonuclease complex with sbcD homologs. This complex is involved in the initiation of recombination to regulate the levels of palindromic sequences in DNA. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

Pssm-ID: 129705 [Multi-domain] Cd Length: 1042 Bit Score: 45.73 E-value: 2.85e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEKKLpvtfedkkrENFERGNLELEKRRQALLEQQRKEQE---RLAQLERAEQERKERERQEQERKRQlELEK 411
Cdd:TIGR00618  533 GEQTYAQLETSE---------EDVYHQLTSERKQRASLKEQMQEIQQsfsILTQCDNRSKEDIPNLQNITVRLQD-LTEK 602

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    412 QLEKQRELERqreeerrkeierreaAKRELERQrqLEWERNRRQELLNQRNKEQEDIVVLKAKKKTL-----EFELEALN 486
Cdd:TIGR00618  603 LSEAEDMLAC---------------EQHALLRK--LQPEQDLQDVRLHLQQCSQELALKLTALHALQltltqERVREHAL 665

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    487 DKKHQLEGKLQDIRCRLTTQRQEIESTNKSRElriaEITHLQQQLqesqqmlgRLIPEKQILNDQLKQVQQNSLHrdslv 566
Cdd:TIGR00618  666 SIRVLPKELLASRQLALQKMQSEKEQLTYWKE----MLAQCQTLL--------RELETHIEEYDREFNEIENASS----- 728

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    567 TLKRALEAKELARQHLRDQLDEvEKETRSKLQEIDIFNNQLKELREIHNKQQLQKqksMEAERLKQKEQERKIIELEKQK 646
Cdd:TIGR00618  729 SLGSDLAAREDALNQSLKELMH-QARTVLKARTEAHFNNNEEVTAALQTGAELSH---LAAEIQFFNRLREEDTHLLKTL 804

                          330       340       350       360       370       380       390
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 47717123    647 EEAQRRAQERDKQWLE---HVQQEDEHQRPRKLHEEEKLKREESVKKKDGEEKGKQEAQdKLGRLFHQHQEPAK 717
Cdd:TIGR00618  805 EAEIGQEIPSDEDILNlqcETLVQEEEQFLSRLEEKSATLGEITHQLLKYEECSKQLAQ-LTQEQAKIIQLSDK 877

First Src homology 3 domain (or SH3A) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212920 [Multi-domain] Cd Length: 55 Bit Score: 40.37 E-value: 2.87e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK---DGDWWTGTVGDKAGVFPSNY 1054
Cdd:cd11987    4 ALYPFEARSHDEITIQPGDIVMVDESqtgEPGWLGGELKGKTGWFPANY 52

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 3; Shank3, also called ProSAP2 (Proline-rich synapse-associated protein 2), is widely expressed. It plays a role in the formation of dendritic spines and synapses. Haploinsufficiency of the Shank3 gene causes the 22q13 deletion/Phelan-McDermid syndrome, and variants of Shank3 have been implicated in autism spectrum disorder, schizophrenia, and intellectual disability. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212917 Cd Length: 52 Bit Score: 40.32 E-value: 2.89e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1081 VIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGkkrqiGWFPANYV 1133
Cdd:cd11984    5 AVKAYSPQGEGEIQLNRGERVKVLSIGEGGFWEGTVKGRT-----GWFPADCV 52

Src Homology 3 domain of Tec (Tyrosine kinase expressed in hepatocellular carcinoma); Tec is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. It is more widely-expressed than other Tec subfamily kinases. Tec is found in endothelial cells, both B- and T-cells, and a variety of myeloid cells including mast cells, erythroid cells, platelets, macrophages and neutrophils. Tec is a key component of T-cell receptor (TCR) signaling, and is important in TCR-stimulated proliferation, IL-2 production and phospholipase C-gamma1 activation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212838 [Multi-domain] Cd Length: 56 Bit Score: 40.18 E-value: 2.92e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1005 EEFIAMYTYESSEQGDLTFQQG-DVILVTKKDGDWWTGTvgDK---AGVFPSNYVRLK 1058
Cdd:cd11905    1 EIVVAMYDFQPTEPHDLRLETGeEYVILEKNDVHWWKAR--DKygkEGYIPSNYVTGK 56

Src Homology 3 (SH3) domain of Inhibitor of ASPP protein (iASPP); iASPP, also called RelA-associated inhibitor (RAI), is an oncoprotein that inhibits the apoptotic transactivation potential of p53. It is upregulated in human breast cancers expressing wild-type p53, in acute leukemias regardless of the p53 mutation status, as well as in ovarian cancer where it is associated with poor patient outcome and chemoresistance. iASPP is also a binding partner and negative regulator of p65RelA, which promotes cell proliferation and inhibits apoptosis; p65RelA has the opposite effect on cell growth compared to the p53 family. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of iASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212885 [Multi-domain] Cd Length: 56 Bit Score: 40.30 E-value: 3.00e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKDG---DWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11952    5 ALWDYSAEFPDELSFKEGDMVTVLRKDGegtDWWWASLCGREGYVPRNYFGL 56

Third Src Homology 3 domain of SH3 domain containing ring finger 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212859 [Multi-domain] Cd Length: 55 Bit Score: 40.34 E-value: 3.02e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTV--GDKAGVFPSNYV 1055
Cdd:cd11926    2 YVAIYPYTPRKEDELELRKGEMFLVFERCQDgWFKGTSmhTSKIGVFPGNYV 53

Coiled-coil domain-containing protein 158; CCDC158 is a family of proteins found in eukaryotes. The function is not known.

Pssm-ID: 464943 [Multi-domain] Cd Length: 1112 Bit Score: 45.88 E-value: 3.03e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    332 EPVLEDEQQQ---LEKKLPVTFEDKKRENFergnleleKRRQALLEQQRKEQErlAQLER---AEQERKERERQEqerkr 405
Cdd:pfam15921   77 ERVLEEYSHQvkdLQRRLNESNELHEKQKF--------YLRQSVIDLQTKLQE--MQMERdamADIRRRESQSQE----- 141

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    406 qlELEKQLEKQRelerqreeerrkeierreaakRELERQRQLewernrRQELLNQRNKEQEDIvvlkaKKKTLEFeleal 485
Cdd:pfam15921  142 --DLRNQLQNTV---------------------HELEAAKCL------KEDMLEDSNTQIEQL-----RKMMLSH----- 182

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    486 ndkkhqlEGKLQDIRCRLT---------TQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPekqiLNDQLKQVQ 556
Cdd:pfam15921  183 -------EGVLQEIRSILVdfeeasgkkIYEHDSMSTMHFRSLGSAISKILRELDTEISYLKGRIFP----VEDQLEALK 251

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    557 QNSLHRDSLVTLKRALEAKELARQH------LRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERL 630
Cdd:pfam15921  252 SESQNKIELLLQQHQDRIEQLISEHeveitgLTEKASSARSQANSIQSQLEIIQEQARNQNSMYMRQLSDLESTVSQLRS 331

                          330       340       350       360       370       380
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123    631 KQKEQER----KIIELEKQ----KEEAQRRAQERDKQWLEHVQQEDEHQR-PRKLHEEEK---LKREES 687
Cdd:pfam15921  332 ELREAKRmyedKIEELEKQlvlaNSELTEARTERDQFSQESGNLDDQLQKlLADLHKREKelsLEKEQN 400

Second Src Homology 3 domain (SH3B) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CIN85. SH3B has been shown to bind Cbl proline-rich peptides and ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212988 [Multi-domain] Cd Length: 53 Bit Score: 40.36 E-value: 3.04e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd12055    4 VAFSYLPQNEDELELKVGDIIeVVGEVEEGWWEGVLNGKTGMFPSNFIK 52

First Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212854 Cd Length: 55 Bit Score: 40.29 E-value: 3.08e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1085 YTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARgkkrqIGWFPANYVKLL 1136
Cdd:cd11921    9 FQAQSPKELTLQKGDIVYIHKEVDKNWLEGEHHGR-----VGIFPANYVEVL 55

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase and similar proteins; This subfamily is composed of Rho GTPase activating proteins (GAPs) with similarity to GRAF. Members contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. Although vertebrates harbor four Rho GAPs in the GRAF subfamily including GRAF, GRAF2, GRAF3, and Oligophrenin-1 (OPHN1), only three are included in this model. OPHN1 contains the BAR, PH and GAP domains, but not the C-terminal SH3 domain. GRAF and GRAF2 show GAP activity towards RhoA and Cdc42. GRAF influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase. GRAF2 regulates caspase-activated p21-activated protein kinase-2. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212815 [Multi-domain] Cd Length: 54 Bit Score: 40.35 E-value: 3.12e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQ--QDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11882    1 RARALYACKAEDESELSFEPGQIITNVQPsdEPGWLEGTLNGRTGLIPENYVEF 54

C-terminal (Fourth) Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the fourth SH3 domain, located at the C-terminus of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212719 Cd Length: 55 Bit Score: 40.14 E-value: 3.16e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1166 YTAQNDDELAFNKGQIINVLNKEDPDWWKG--EVNGQVGLFPSNYVK 1210
Cdd:cd11785    8 YPPQSEAELELKEGDIVFVHKKREDGWFKGtlQRTGKTGLFPGSFVE 54

Src Homology 3 domain of Membrane Protein, Palmitoylated 3 (or MAGUK p55 subfamily member 3); MPP3 is a scaffolding protein that colocalizes with MPP5 and CRB1 at the subdpical region adjacent to adherens junctions and may function in photoreceptor polarity. It interacts with some nectins and regulates their trafficking and processing. Nectins are cell-cell adhesion proteins involved in the establishment apical-basal polarity at cell adhesion sites. It is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212972 Cd Length: 62 Bit Score: 40.33 E-value: 3.17e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1163 MYDYTAQNDDE-------LAFNKGQIINVLNKEDPDWWK----GEVNGQVGLFPS 1206
Cdd:cd12039    5 LFDYNPYEDRAipcqeagLPFKRRDILEVVSQDDPTWWQakrvGDTNLRAGLIPS 59

Src Homology 3 domain of Sorting nexin 18; SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. It binds FIP5 and is required for apical lumen formation. It may also play a role in axonal elongation. SNXs are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNX18 also contains BAR and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212830 [Multi-domain] Cd Length: 55 Bit Score: 40.36 E-value: 3.18e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM--WWFG-EVQGQKGWFPKSYVKL 968
Cdd:cd11897    1 RARALYDFRSENPGEISLREHEVLSLCSEQDIegWLEGvNSRGDRGLFPASYVEV 55

Src homology 3 domain of RUN and SH3 domain-containing protein 2; RUSC2, also called Iporin or Interacting protein of Rab1, is expressed ubiquitously with highest amounts in the brain and testis. It interacts with the small GTPase Rab1 and the Golgi matrix protein GM130, and may function in linking GTPases to certain intracellular signaling pathways. RUSC proteins are adaptor proteins consisting of RUN, leucine zipper, and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212890 Cd Length: 52 Bit Score: 40.28 E-value: 3.23e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILV-TKKDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11957    1 EVKALCHHIATEPGQLSFNKGDILQVlSRADGDWLRCSLGPDSGLVPIAYV 51

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 40.34 E-value: 3.27e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd12054    2 QCKVLFEYVPQNEDELELKVGDIIDINEEvEEGWWSGTLNGKSGLFPSNFVK 53

Src homology 3 domain of Endophilin-B; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain two endophilin-B isoforms. Endophilin-B proteins are cytoplasmic proteins expressed mainly in the heart, placenta, and skeletal muscle. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212736 [Multi-domain] Cd Length: 52 Bit Score: 39.96 E-value: 3.28e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINV--LNKEDPDWWKGEVNGQVGLFPSNY 1208
Cdd:cd11802    5 LYDYDAEDSTELSLLADEVITVyeLPGMDEDYMMGERGSQRGKVPVAY 52

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212849 [Multi-domain] Cd Length: 59 Bit Score: 40.36 E-value: 3.39e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTV--GDKAGVFPSNYVRL 1057
Cdd:cd11916    6 ALYSYAPQNDDELELRDGDIVDVMEKcDDGWFVGTSrrTKQFGTFPGNYVKL 57

C-terminal Src Homology 3 domain of the p67phox subunit of NADPH oxidase and similar proteins; This subfamily is composed of p67phox, NADPH oxidase activator 1 (Noxa1), and similar proteins. p67phox, also called Neutrophil cytosol factor 2 (NCF-2), and Noxa1 are homologs and are the cytosolic subunits of the phagocytic (Nox2) and nonphagocytic (Nox1) NADPH oxidase complexes, respectively. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox and Noxa1 play regulatory roles. p67phox contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. Noxa1 has a similar domain architecture except it is lacking the N-terminal SH3 domain. The TPR domain of both binds activated GTP-bound Rac, while the C-terminal SH3 domain of p67phox and Noxa1 binds the polyproline motif found at the C-terminus of p47phox and Noxo1, respectively. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212803 [Multi-domain] Cd Length: 53 Bit Score: 40.20 E-value: 3.40e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQKGWFPKSYVK 967
Cdd:cd11870    1 QVVALHRYEAQGPEDLGFREGDTIDVLSEVNEAWLeGHSDGRVGIFPKCFVV 52

Second Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212855 [Multi-domain] Cd Length: 58 Bit Score: 40.36 E-value: 3.47e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNG--QVGLFPSNYVKL 1211
Cdd:cd11922    2 EAIAKFNFNGDTQVEMSFRKGERITLLRQVDENWYEGRIPGtsRQGIFPITYVDV 56

Third (or C-terminal) Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212851 [Multi-domain] Cd Length: 58 Bit Score: 40.33 E-value: 3.49e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1004 GEEFIAMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTV--GDKAGVFPSNYV 1055
Cdd:cd11918    1 RTPYKAVYQYRPQNEDELELREGDRVDVMQQcDDGWFVGVSrrTQKFGTFPGNYV 55

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 40.19 E-value: 3.62e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQ---QDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd12056    5 KALFHYEGTNEDELDFKEGEIILIISKdtgEPGWWKGELNGKEGVFPDNFVSQ 57

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 40.20 E-value: 3.63e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1085 YTATGPEQLTLAPGQLILIRKKNPGGWWEGelQARGKkrqIGWFPANYVKLL 1136
Cdd:cd12073    9 YQGEGDDEISFDPQETITDIEMVDEGWWKG--TCHGH---RGLFPANYVELL 55

Nop53 (60S ribosomal biogenesis); This nucleolar family of proteins are involved in 60S ribosomal biogenesis. They are specifically involved in the processing beyond the 27S stage of 25S rRNA maturation. This family contains sequences that bear similarity to the glioma tumour suppressor candidate region gene 2 protein (p60). This protein has been found to interact with herpes simplex type 1 regulatory proteins.

Pssm-ID: 462259 [Multi-domain] Cd Length: 353 Bit Score: 44.98 E-value: 3.66e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    363 LELEKRRQALLEQQRKEQERLAQLERAEQERK-----ERERQEQERKRQLELEKQLEKQrelerqreeerrkeierreaa 437
Cdd:pfam07767  209 KKRLKEEEKLERVLEKIAESAATAEAREEKRKtkaqrNKEKRRKEEEREAKEEKALKKK--------------------- 267

                           90       100       110       120       130       140
                   ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    438 KRELERQRQLewernrRQELLNQRNKEQEDIVVLKAKKKTLEFELEALndKKHQLeGKLQ 497
Cdd:pfam07767  268 LAQLERLKEI------AKEIAEKEKEREEKAEARKREKRKKKKEEKKL--RPRKL-GKHK 318

Src homology 3 domain of SH3 and multiple ankyrin repeat domains (Shank) proteins; Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. They bind a variety of membrane and cytosolic proteins, and exist in alternatively spliced isoforms. They are highly enriched in postsynaptic density (PSD) where they interact with the cytoskeleton and with postsynaptic membrane receptors including NMDA and glutamate receptors. They are crucial in the construction and organization of the PSD and dendritic spines of excitatory synapses. There are three members of this family (Shank1, Shank2, Shank3) which show distinct and cell-type specific patterns of expression. Shank1 is brain-specific; Shank2 is found in neurons, glia, endocrine cells, liver, and kidney; Shank3 is widely expressed. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212766 Cd Length: 50 Bit Score: 39.73 E-value: 3.74e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTK-KDGDWWTGTVGDKAGVFPS 1052
Cdd:cd11832    2 FIAVKSYSPQEEGEISLHKGDRVKVLSiGEGGFWEGSVRGRTGWFPS 48

Src Homology 3 domain of Melanoma Inhibitory Activity protein and similar proteins; MIA is a single domain protein that adopts a SH3 domain-like fold; it contains an additional antiparallel beta sheet and two disulfide bonds compared to classical SH3 domains. MIA is secreted from malignant melanoma cells and it plays an important role in melanoma development and invasion. MIA is expressed by chondrocytes in normal tissues and may be important in the cartilage cell phenotype. Unlike classical SH3 domains, MIA does not bind proline-rich ligands. MIA is a member of the recently identified family that also includes MIA-like (MIAL), MIA2, and MIA3 (also called TANGO); the biological functions of this family are not yet fully understood.

Pssm-ID: 212694 Cd Length: 76 Bit Score: 40.54 E-value: 3.75e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNK---EDPDWWKGEVNGQ---VGLFPSNYVK 1210
Cdd:cd11760   17 LEDYHGPDCRFLNFKKGDTIYVYSKlagERQDLWAGSVGGDaglFGYFPKNLVQ 70

flagellar export protein FliJ; Members of this family are the FliJ protein found, in nearly every case, in the midst of other flagellar biosynthesis genes in bacgterial genomes. Typically the fliJ gene is found adjacent to the gene for the flagellum-specific ATPase FliI. Sequence scoring in the gray zone between trusted and noise cutoffs include both probable FliJ proteins and components of bacterial type III secretion systems.

Pssm-ID: 131526 [Multi-domain] Cd Length: 141 Bit Score: 42.30 E-value: 3.87e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    550 DQLKQVQQnsLHRDSLVTLKRALEAKELARQHLRDQLDEVEKETR----------------SKLQEIDIFNNQLKELREI 613
Cdd:TIGR02473    2 FRLQKLLD--LREKEEEQAKLELAKAQAEFERLETQLQQLIKYREeyeqqalekvgagtsaLELSNYQRFIRQLDQRIQQ 79

                           90       100       110       120       130
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123    614 HNKQQLQKQKSMEA--ERLKQKEQERKIIEL--EKQKEEAQRRAQERDKQWL-EHVQQ 666
Cdd:TIGR02473   80 QQQELALLQQEVEAkrERLLEARRELKALEKlkEKKQKEYRAEEAKREQKEMdELATQ 137

TolA protein; TolA couples the inner membrane complex of itself with TolQ and TolR to the outer membrane complex of TolB and OprL (also called Pal). Most of the length of the protein consists of low-complexity sequence that may differ in both length and composition from one species to another, complicating efforts to discriminate TolA (the most divergent gene in the tol-pal system) from paralogs such as TonB. Selection of members of the seed alignment and criteria for setting scoring cutoffs are based largely conserved operon struction. //The Tol-Pal complex is required for maintaining outer membrane integrity. Also involved in transport (uptake) of colicins and filamentous DNA, and implicated in pathogenesis. Transport is energized by the proton motive force. TolA is an inner membrane protein that interacts with periplasmic TolB and with outer membrane porins ompC, phoE and lamB. [Transport and binding proteins, Other, Cellular processes, Pathogenesis]

Pssm-ID: 274303 [Multi-domain] Cd Length: 346 Bit Score: 44.84 E-value: 3.87e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    588 EVEKETRSKLQEIDIFNNQLKELREihNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQE 667
Cdd:TIGR02794   51 QANRIQQQKKPAAKKEQERQKKLEQ--QAEEAEKQRAAEQARQKELEQRAAAEKAAKQAEQAAKQAEEKQKQAEEAKAKQ 128

                           90       100
                   ....*....|....*....|....*.
gi 47717123    668 -------DEHQRPRKLHEEEKLKREE 686
Cdd:TIGR02794  129 aaeakakAEAEAERKAKEEAAKQAEE 154

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. Also included in this subfamily is the second C-terminal SH3 domain of Rho guanine nucleotide exchange factor 37 (ARHGEF37), whose function is still unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212734 [Multi-domain] Cd Length: 57 Bit Score: 40.05 E-value: 3.92e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILV-----TKKDGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd11800    2 YYALYTFEARSPGELSVTEGQVVTVlekhdLKGNPEWWLVEDRGKQGYVPSNYLA 56

phosphodiesterase; Provisional

Pssm-ID: 237177 [Multi-domain] Cd Length: 520 Bit Score: 45.15 E-value: 3.97e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   336 EDEQQQLEKKLPVTFE--DKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKER-ER-----QEQERKRQL 407
Cdd:PRK12704   81 RNELQKLEKRLLQKEEnlDRKLELLEKREEELEKKEKELEQKQQELEKKEEELEELIEEQLQElERisgltAEEAKEILL 160

                          90
                  ....*....|
gi 47717123   408 E-LEKQLEKQ 416
Cdd:PRK12704  161 EkVEEEARHE 170

Src Homology 3 domain of Apoptosis Stimulating of p53 protein 1; ASPP1, like ASPP2, activates the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73). In addition, it functions in the cytoplasm to regulate the nuclear localization of the transcriptional cofactors YAP and TAZ by inihibiting their phosphorylation; YAP and TAZ are important regulators of cell expansion, differentiation, migration, and invasion. ASPP1 is downregulated in breast tumors expressing wild-type p53. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of ASPP1 contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212887 [Multi-domain] Cd Length: 57 Bit Score: 40.00 E-value: 4.00e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQD----MWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11954    3 VYALWDYEAQNADELSFQEGDAITILRRKDdsetEWWWARLNDKEGYVPKNLLGL 57

C2 domain second repeat in Munc13 (mammalian uncoordinated) proteins; C2-like domains are thought to be involved in phospholipid binding in a Ca2+ independent manner in both Unc13 and Munc13. Caenorabditis elegans Unc13 has a central domain with sequence similarity to PKC, which includes C1 and C2-related domains. Unc13 binds phorbol esters and DAG with high affinity in a phospholipid manner. Mutations in Unc13 results in abnormal neuronal connections and impairment in cholinergic neurotransmission in the nematode. Munc13 is the mammalian homolog which are expressed in the brain. There are 3 isoforms (Munc13-1, -2, -3) and are thought to play a role in neurotransmitter release and are hypothesized to be high-affinity receptors for phorbol esters. Unc13 and Munc13 contain both C1 and C2 domains. There are two C2 related domains present, one central and one at the carboxyl end. Munc13-1 contains a third C2-like domain. Munc13 interacts with syntaxin, synaptobrevin, and synaptotagmin suggesting a role for these as scaffolding proteins. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 175993 [Multi-domain] Cd Length: 127 Bit Score: 42.17 E-value: 4.01e-04

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1615 GKSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLcITVFERD---------QFS--PDDFLGRTEIRV 1682
Cdd:cd04027   20 GTSDPYVTVQVGKTKKRTKTIPQNLNPVWNEKFHFECHNSSDRIK-VRVWDEDddiksrlkqKFTreSDDFLGQTIIEV 97

rad50; All proteins in this family for which functions are known are involvedin recombination, recombinational repair, and/or non-homologous end joining.They are components of an exonuclease complex with MRE11 homologs. This family is distantly related to the SbcC family of bacterial proteins.This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University).

Pssm-ID: 129694 [Multi-domain] Cd Length: 1311 Bit Score: 45.42 E-value: 4.04e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    370 QALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKqLEKQRELERQREEERRKEIERREAAKRELERQRQLEW 449
Cdd:TIGR00606  690 EAELQEFISDLQSKLRLAPDKLKSTESELKKKEKRRDEMLGL-APGRQSIIDLKEKEIPELRNKLQKVNRDIQRLKNDIE 768

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    450 ERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRiaeithlqq 529
Cdd:TIGR00606  769 EQETLLGTIMPEEESAKVCLTDVTIMERFQMELKDVERKIAQQAAKLQGSDLDRTVQQVNQEKQEKQHELD--------- 839

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    530 qlqeSQQMLGRLIpeKQILNDQLKQVQQNSLHRDSLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKE 609
Cdd:TIGR00606  840 ----TVVSKIELN--RKLIQDQQEQIQHLKSKTNELKSEKLQIGTNLQRRQQFEEQLVELSTEVQSLIREIKDAKEQDSP 913

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    610 LRE------------IHNKQQLQKQKSME----AERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRP 673
Cdd:TIGR00606  914 LETflekdqqekeelISSKETSNKKAQDKvndiKEKVKNIHGYMKDIENKIQDGKDDYLKQKETELNTVNAQLEECEKHQ 993

                          330
                   ....*....|...
gi 47717123    674 RKLHEEEKLKREE 686
Cdd:TIGR00606  994 EKINEDMRLMRQD 1006

C-terminal (Fourth) Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the fourth SH3 domain, located at the C-terminus of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212719 Cd Length: 55 Bit Score: 39.76 E-value: 4.04e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1080 QVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGKKrqiGWFPANYVK 1134
Cdd:cd11785    3 RVIVPYPPQSEAELELKEGDIVFVHKKREDGWFKGTLQRTGKT---GLFPGSFVE 54

DDRGK domain; This is a family of proteins of approximately 300 residues, found in plants and vertebrates. They contain a highly conserved DDRGK motif.

Pssm-ID: 370664 [Multi-domain] Cd Length: 188 Bit Score: 43.11 E-value: 4.04e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    366 EKRRQALLEQQRKEQERLAQleraEQERKERERQEQERKRQLELEKqlekqrelerqreeerrkeierreaAKRELERQR 445
Cdd:pfam09756    5 AKKRAKLELKEAKRQQREAE----EEEREEREKLEEKREEEYKERE-------------------------EREEEAEKE 55

                           90       100       110       120       130
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123    446 QLEWERNRRQEllnQRNKEQEDIVVLKAkkktlEFELEALNDKKHQLEGKLQDIRC 501
Cdd:pfam09756   56 KEEEERKQEEE---QERKEQEEYEKLKS-----QFVVEEEGTDKLSAEDESQLLED 103

PH domain; PH stands for pleckstrin homology.

Pssm-ID: 459697 [Multi-domain] Cd Length: 105 Bit Score: 41.39 E-value: 4.09e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   1465 HSGKLYK-----AKSNKELYGFLFNDFLLLtqitkplgssgtdkvFSPKSNLQYKMYKTPIFLNEV-LVKLPTDPSGDEP 1538
Cdd:pfam00169    3 KEGWLLKkgggkKKSWKKRYFVLFDGSLLY---------------YKDDKSGKSKEPKGSISLSGCeVVEVVASDSPKRK 67

                           90       100       110
                   ....*....|....*....|....*....|....*...
gi 47717123   1539 -IFHISHID----RVYTLRAESINERTAWVQKIKAASE 1571
Cdd:pfam00169   68 fCFELRTGErtgkRTYLLQAESEEERKDWIKAIQSAIR 105

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The N-terminal SH3 domain of GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212738 [Multi-domain] Cd Length: 52 Bit Score: 39.65 E-value: 4.12e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVTKKDGD--WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11804    1 EAVAKHDFKATAEDELSFKKGSILKVLNMEDDpnWYKAELDGKEGLIPKNYI 52

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 40.01 E-value: 4.16e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1078 IAQVIASYTATGPEQLTLAPGQLILI-RKKNPGGWWEGELQARgkkrqIGWFPANYVK 1134
Cdd:cd11978    2 IAIARYDFCARDMRELSLLKGDVVKIyTKMSTNGWWRGEVNGR-----VGWFPSTYVE 54

Periplasmic chaperone for outer membrane proteins, Skp family [Cell wall/membrane/envelope biogenesis, Posttranslational modification, protein turnover, chaperones];

Pssm-ID: 442073 [Multi-domain] Cd Length: 171 Bit Score: 42.90 E-value: 4.18e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  335 LEDEQQQLEKKLpvtfeDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKQLE 414
Cdd:COG2825   48 LEKEFKKRQAEL-----QKLEKELQALQEKLQKEAATLSEEERQKKERELQKKQQELQRKQQEAQQDLQKRQQELLQPIL 122


                 ..
gi 47717123  415 KQ 416
Cdd:COG2825  123 EK 124

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 39.68 E-value: 4.40e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVKgewvdeSQTG-EPGWLGGELKGKTGWFPANY 800
Cdd:cd11841    4 ALYSFEGQQPCDLSFQAGDRITVL------TRTDsQFDWWEGRLRGRVGIFPANY 52

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 45.31 E-value: 4.41e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  363 LELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKQLEkqrelerqrEEERRKEIERREAAKRELE 442
Cdd:COG1196  651 LEGEGGSAGGSLTGGSRRELLAALLEAEAELEELAERLAEEELELEEALLAE---------EEEERELAEAEEERLEEEL 721

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  443 RQRQLEWERNR-RQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDI------------RCR-----LT 504
Cdd:COG1196  722 EEEALEEQLEAeREELLEELLEEEELLEEEALEELPEPPDLEELERELERLEREIEALgpvnllaieeyeELEerydfLS 801

                        170       180
                 ....*....|....*....|
gi 47717123  505 TQRQEIESTNKSRELRIAEI 524
Cdd:COG1196  802 EQREDLEEARETLEEAIEEI 821

Second or C-terminal Src homology 3 domain of the p47phox subunit of NADPH oxidase, also called Neutrophil Cytosolic Factor 1; p47phox, or NCF1, is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox), which plays a key role in the ability of phagocytes to defend against bacterial infections. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p47phox is required for activation of NADH oxidase and plays a role in translocation. It contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), a polybasic/autoinhibitory region, and a C-terminal proline-rich region (PRR). This model characterizes the second SH3 domain (or C-SH3) of p47phox. In its inactive state, the tandem SH3 domains interact intramolecularly with the autoinhibitory region; upon activation, the tandem SH3 domains are exposed through a conformational change, resulting in their binding to the PRR of p22phox and the activation of NADPH oxidase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212955 [Multi-domain] Cd Length: 53 Bit Score: 39.82 E-value: 4.56e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1165 DYTAQNDDELAFNKGQIINVLNKEDPDWW---KGEvngQVGLFPSNYVK 1210
Cdd:cd12022    7 AYTAVEEDELTLLEGEAIEVIHKLLDGWWvvrKGE---VTGYFPSMYLQ 52

Src Homology 3 domain of Cytokinesis protein 3 and similar proteins; Cytokinesis protein 3 (Cyk3 or Cyk3p) is a component of the actomyosin ring independent cytokinesis pathway in yeast. It interacts with Inn1 and facilitates its recruitment to the bud neck, thereby promoting cytokinesis. Cyk3p contains an N-terminal SH3 domain and a C-terminal transglutaminase-like domain. The Cyk3p SH3 domain binds to the C-terminal proline-rich region of Inn1. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212822 Cd Length: 53 Bit Score: 39.79 E-value: 4.62e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQD-MWWFGEVQ--GQKGWFPKSYV 966
Cdd:cd11889    2 VKAVYSWAGETEGDLGFLEGDLIEVLSIGDgSWWSGKLRrnGAEGIFPSNFV 53

Calcium binding and coiled-coil domain (CALCOCO1) like; Proteins found in this family are similar to the coiled-coil transcriptional coactivator protein coexpressed by Mus musculus (CoCoA/CALCOCO1). This protein binds to a highly conserved N-terminal domain of p160 coactivators, such as GRIP1, and thus enhances transcriptional activation by a number of nuclear receptors. CALCOCO1 has a central coiled-coil region with three leucine zipper motifs, which is required for its interaction with GRIP1 and may regulate the autonomous transcriptional activation activity of the C-terminal region.

Pssm-ID: 462303 [Multi-domain] Cd Length: 488 Bit Score: 44.89 E-value: 4.72e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEKKLPVTFED-----KKRENFERGNLELEKRRQALLEQQRKEQERLAQLE-------------RAEQER-KE 395
Cdd:pfam07888   78 LESRVAELKEELRQSREKheeleEKYKELSASSEELSEEKDALLAQRAAHEARIRELEediktltqrvlerETELERmKE 157

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    396 RERQEQERKRQLELEK---QLEKQRELERQREEERRKEIERREAAKRELERQrQLEWERNRRQELLNQRNKEQEDIVVLK 472
Cdd:pfam07888  158 RAKKAGAQRKEEEAERkqlQAKLQQTEEELRSLSKEFQELRNSLAQRDTQVL-QLQDTITTLTQKLTTAHRKEAENEALL 236

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    473 AKKKTLEfelEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSReLRIAEIT-HLQQQLQESQQMLGRLIPEKQILndq 551
Cdd:pfam07888  237 EELRSLQ---ERLNASERKVEGLGEELSSMAAQRDRTQAELHQAR-LQAAQLTlQLADASLALREGRARWAQERETL--- 309

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    552 lkqvQQNS-LHRDSLVTLKRALEAKELARQHLRDQLDEVEKETRsklQEIDIFNNQLKELReihnkQQLQKQKSmeAERL 630
Cdd:pfam07888  310 ----QQSAeADKDRIEKLSAELQRLEERLQEERMEREKLEVELG---REKDCNRVQLSESR-----RELQELKA--SLRV 375

                          330       340       350       360
                   ....*....|....*....|....*....|....*....|....*
gi 47717123    631 KQKEQERkiIELEKQ------KEEAQRRAQERDKQWLEHVQQEDE 669
Cdd:pfam07888  376 AQKEKEQ--LQAEKQelleyiRQLEQRLETVADAKWSEAALTSTE 418

Third Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212837 [Multi-domain] Cd Length: 57 Bit Score: 39.63 E-value: 4.75e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK---DGDWWTGTVGD-KAGVFPSNYV 1055
Cdd:cd11904    5 ALYPFSSSNDEELNFEKGEVMDVIEKpenDPEWWKCRKANgQVGLVPKNYV 55

Myosin tail; The myosin molecule is a multi-subunit complex made up of two heavy chains and four light chains it is a fundamental contractile protein found in all eukaryote cell types. This family consists of the coiled-coil myosin heavy chain tail region. The coiled-coil is composed of the tail from two molecules of myosin. These can then assemble into the macromolecular thick filament. The coiled-coil region provides the structural backbone the thick filament.

Pssm-ID: 460256 [Multi-domain] Cd Length: 1081 Bit Score: 45.17 E-value: 4.79e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    326 DQRLPEEpvlEDEQQ--QLEKklpVTFEDKKREnFERGNLELEKRRQALLEQQRKEQERLAQLER--AEQERKER----- 396
Cdd:pfam01576  109 EEQLDEE---EAARQklQLEK---VTTEAKIKK-LEEDILLLEDQNSKLSKERKLLEERISEFTSnlAEEEEKAKslskl 181

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    397 ------------ERQEQERKRQLELEK---QLEKQRELERQREEERRKEIERREA--AKRELERQRQLewerNRRQELLN 459
Cdd:pfam01576  182 knkheamisdleERLKKEEKGRQELEKakrKLEGESTDLQEQIAELQAQIAELRAqlAKKEEELQAAL----ARLEEETA 257

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    460 QRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEIE----STNKSRELRI---AEITHLQQQLQ 532
Cdd:pfam01576  258 QKNNALKKIRELEAQISELQEDLESERAARNKAEKQRRDLGEELEALKTELEdtldTTAAQQELRSkreQEVTELKKALE 337

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    533 ESQQMLGRLIPEKQI--------LNDQLKQVQQNslhRDSLVTLKRALEA--KELA----------------RQHLRDQL 586
Cdd:pfam01576  338 EETRSHEAQLQEMRQkhtqaleeLTEQLEQAKRN---KANLEKAKQALESenAELQaelrtlqqakqdsehkRKKLEGQL 414

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    587 DEVE-------------KETRSKLQ-EIDIFNNQLKELR---------------EIHNKQQL----QKQKSMEAERLKQK 633
Cdd:pfam01576  415 QELQarlseserqraelAEKLSKLQsELESVSSLLNEAEgkniklskdvsslesQLQDTQELlqeeTRQKLNLSTRLRQL 494

                          410       420       430       440       450       460       470
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123    634 EQERKIIELEKQKEEAQRRAQER-----DKQWLEHVQQEDEHQRPRKLHEEEKLKREESVKKKDGEEKGKQEAQDKLGR 707
Cdd:pfam01576  495 EDERNSLQEQLEEEEEAKRNVERqlstlQAQLSDMKKKLEEDAGTLEALEEGKKRLQRELEALTQQLEEKAAAYDKLEK 573

Src homology 3 domain of Ubiquitin-associated and SH3 domain-containing proteins, also called TULA (T cell Ubiquitin LigAnd) family of proteins; UBASH3 or TULA proteins are also referred to as Suppressor of T cell receptor Signaling (STS) proteins. They contain an N-terminal UBA domain, a central SH3 domain, and a C-terminal histidine phosphatase domain. They bind c-Cbl through the SH3 domain and to ubiquitin via UBA. In some vertebrates, there are two TULA family proteins, called UBASH3A (also called TULA or STS-2) and UBASH3B (also called TULA-2 or STS-1), which show partly overlapping as well as distinct functions. UBASH3B is widely expressed while UBASH3A is only found in lymphoid cells. UBASH3A facilitates apoptosis induced in T cells through its interaction with the apoptosis-inducing factor AIF. UBASH3B is an active phosphatase while UBASH3A is not. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212725 [Multi-domain] Cd Length: 59 Bit Score: 39.98 E-value: 4.79e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1157 VCQVIgmYDYTAQNDDELAFNKGQIINV----LNKEDPDWWKG--EVNGQVGLFPSNYV 1209
Cdd:cd11791    1 VLRVL--YPYTPQEEDELELVPGDYIYVspeeLDSSSDGWVEGtsWLTGCSGLLPENYT 57

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 39.71 E-value: 4.89e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1078 IAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGElqARGkkrQIGWFPANYVKL 1135
Cdd:cd11959    1 TAVALYDYQAADDDEISFDPDDIITNIEMIDEGWWRGV--CRG---KYGLFPANYVEL 53

First Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the first SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212948 Cd Length: 53 Bit Score: 39.71 E-value: 4.93e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1081 VIASYTATGPEQLTLAPGQLILIRKKNPGGWW----EGELqargkkrqiGWFPANY 1132
Cdd:cd12015    4 VVADYKKQQPNEISLRAGDVVDVIEKNENGWWfvslEDEQ---------GWVPATY 50

Src homology 3 domain of Slit-Robo GTPase Activating Protein 4; srGAP4, also called ARHGAP4, is highly expressed in hematopoietic cells and may play a role in lymphocyte differentiation. It is able to stimulate the GTPase activity of Rac1, Cdc42, and RhoA. In the nervous system, srGAP4 has been detected in differentiating neurites and may be involved in axon and dendritic growth. srGAPs are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212889 [Multi-domain] Cd Length: 55 Bit Score: 39.82 E-value: 5.04e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  916 LQAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11956    2 VEAVACFDYTGRTAQELSFKRGDVLLLHSKASSdWWRGEHNGMRGLIPHKYISV 55

Src Homology 3 (SH3) domain of Inhibitor of ASPP protein (iASPP); iASPP, also called RelA-associated inhibitor (RAI), is an oncoprotein that inhibits the apoptotic transactivation potential of p53. It is upregulated in human breast cancers expressing wild-type p53, in acute leukemias regardless of the p53 mutation status, as well as in ovarian cancer where it is associated with poor patient outcome and chemoresistance. iASPP is also a binding partner and negative regulator of p65RelA, which promotes cell proliferation and inhibits apoptosis; p65RelA has the opposite effect on cell growth compared to the p53 family. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of iASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212885 [Multi-domain] Cd Length: 56 Bit Score: 39.53 E-value: 5.05e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLE---QQDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11952    5 ALWDYSAEFPDELSFKEGDMVTVLRkdgEGTDWWWASLCGREGYVPRNYFGL 56

Src homology 3 domain of the Rho guanine nucleotide exchange factor, ephexin-1 (also called NGEF or ARHGEF27); Ephexin-1, also called NGEF (neuronal GEF) or ARHGEF27, activates RhoA, Tac1, and Cdc42 by exchanging bound GDP for free GTP. It is expressed mainly in the brain in a region associated with movement control. It regulates the stability of postsynaptic acetylcholine receptor (AChR) clusters and thus, plays a critical role in the maturation and neurotransmission of neuromuscular junctions. Ephexin-1 directly interacts with the ephrin receptor EphA4 and their coexpression enhances the ability of ephexin-1 to activate RhoA. It is required for normal axon growth and EphA-induced growth cone collapse. Ephexin-1 contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212872 [Multi-domain] Cd Length: 55 Bit Score: 39.54 E-value: 5.07e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEV--NGQVGLFPSNYVK 1210
Cdd:cd11939    1 QVQCVHPYVSQEPDELSLELADVLNILDKTDDGWIFGERlhDQERGWFPSSVVE 54

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 39.69 E-value: 5.28e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGelqaRGKKRQIGWFPANYVKL 1135
Cdd:cd11960    2 ARALYDYQAADDTEISFDPGDIITDIEQIDEGWWRG----TGPDGTYGLFPANYVEL 54

Src homology 3 domain of Apoptosis Stimulating of p53 proteins (ASPP); The ASPP family of proteins bind to important regulators of apoptosis (p53, Bcl-2, and RelA) and cell growth (APCL, PP1). They share similarity at their C-termini, where they harbor a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain. Vertebrates contain three members of the family: ASPP1, ASPP2, and iASPP. ASPP1 and ASPP2 activate the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73), while iASPP is an oncoprotein that specifically inhibits p53-induced apoptosis. The expression of ASPP proteins is altered in tumors; ASPP1 and ASPP2 are downregulated whereas iASPP is upregulated is some cancer types. ASPP proteins also bind and regulate protein phosphatase 1 (PP1), and this binding is competitive with p53 binding. The SH3 domain and the ANK repeats of ASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212741 [Multi-domain] Cd Length: 57 Bit Score: 39.67 E-value: 5.29e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVL----EQQDMWWFGEVQGQKGWFPKSYVKL 968
Cdd:cd11807    2 VVYALFDYEAENGDELSFREGDELTVLrkgdDDETEWWWARLNDKEGYVPRNLLGL 57

Third Src Homology 3 domain of Nck adaptor proteins; This group contains the third SH3 domain of Nck, the first SH3 domain of Caenorhabditis elegans Ced-2 (Cell death abnormality protein 2), and similar domains. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. Ced-2 is a cell corpse engulfment protein that interacts with Ced-5 in a pathway that regulates the activation of Ced-10, a Rac small GTPase.

Pssm-ID: 212701 [Multi-domain] Cd Length: 56 Bit Score: 39.60 E-value: 5.41e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKK---DGDWW-----TGTVgdkaGVFPSNYV 1055
Cdd:cd11767    3 VALYPFTGENDEELSFEKGERLEIIEKpedDPDWWkarnaLGTT----GLVPRNYV 54

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 2; ASAP2 is also called DDEF2 (Development and Differentiation Enhancing Factor 2), AMAP2, centaurin beta-3, or PAG3. It mediates the functions of Arf GTPases vial dual mechanisms: it exhibits GTPase activating protein (GAP) activity towards class I (Arf1) and II (Arf5) Arfs; and it binds class III Arfs (GTP-Arf6) stably without GAP activity. It binds paxillin and is implicated in Fcgamma receptor-mediated phagocytosis in macrophages and in cell migration. ASAP2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212899 Cd Length: 56 Bit Score: 39.55 E-value: 5.47e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVT-KKDGDWWTGTV-GD--KAGVFPSNYV 1055
Cdd:cd11966    4 ALYNCVADNPDELTFSEGEIIIVDgEEDKEWWIGHIdGEptRRGAFPVSFV 54

Third Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the third SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212950 Cd Length: 53 Bit Score: 39.36 E-value: 5.58e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1082 IASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGkkrqiGWFPANYV 1133
Cdd:cd12017    5 IGEFQATIQDGISFQKGQKVEVIDKNPSGWWYVKIDGKE-----GWAPSSYI 51

Extracytoplasmic sensor domain CHASE3 (specificity unknown) [Signal transduction mechanisms];

Pssm-ID: 444089 [Multi-domain] Cd Length: 530 Bit Score: 44.51 E-value: 5.63e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  356 ENFERGNLELEKRRQAL---LEQQRKEQERLAQLERAEQERKE------RERQEQERKRQLELEKQLEKQRELERQREEE 426
Cdd:COG5278   79 EPYEEARAEIDELLAELrslTADNPEQQARLDELEALIDQWLAeleqviALRRAGGLEAALALVRSGEGKALMDEIRARL 158

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  427 RRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRcRLTTQ 506
Cdd:COG5278  159 LLLALALAALLLAAAALLLLLLALAALLALAELLLLALARALAALLLLLLLEAELAAAAALLAAAAALAALAAL-ELLAA 237

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  507 RQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRDSLVTLKRALEAKELARQHLRDQL 586
Cdd:COG5278  238 LALALALLLAALLLALLAALALAALLAAALLALAALLLALAAAAALAAAAALELAAAEALALAELELELLLAAAAAAAAA 317

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  587 DEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEHVQQ 666
Cdd:COG5278  318 AAAAAAALAALLALALATALAAAAAALALLAALLAEAAAAAAEEAEAAAEAAAAALAGLAEVEAEGAAEAVELEVLAIAA 397

                        330       340       350       360       370       380       390
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 47717123  667 EDEHQRPRKLHEEEKLKREESVKKKDGEEKGKQEAQDKLGRLFHQHQEPAKPAVQAPWSTAEKGPLTISAQENV 740
Cdd:COG5278  398 AAAAAAAEAAAAAAAAAAASAAEALELAEALAEALALAEEEALALAAASSELAEAGAALALAAAEALAEELAAV 471

Uncharacterized conserved protein, contains a C-terminal ATPase domain [Function unknown];

Pssm-ID: 443941 [Multi-domain] Cd Length: 1089 Bit Score: 44.91 E-value: 5.69e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  337 DEQQQLEKKLPVTFEDKKREnfergnlELEKRRQALLEQQRKEQERLAQLERAEQERKERER------------------ 398
Cdd:COG4913  272 AELEYLRAALRLWFAQRRLE-------LLEAELEELRAELARLEAELERLEARLDALREELDeleaqirgnggdrleqle 344

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  399 QEQERkrqleLEKQLEKQRELERQREEERRKEIERREAAKRELERQRQ-----LEWERNRRQELLNQRNKEQEDIVVLKA 473
Cdd:COG4913  345 REIER-----LERELEERERRRARLEALLAALGLPLPASAEEFAALRAeaaalLEALEEELEALEEALAEAEAALRDLRR 419

                        170       180       190
                 ....*....|....*....|....*....|
gi 47717123  474 KKKTLEFELEALNDKKHQLEGKLQDIRCRL 503
Cdd:COG4913  420 ELRELEAEIASLERRKSNIPARLLALRDAL 449

Third Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212717 [Multi-domain] Cd Length: 55 Bit Score: 39.30 E-value: 5.77e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGE--VQGQKGWFPKSYVKL 968
Cdd:cd11783    4 ALYPYKPQKPDELELRKGEMYTVTEKcQDGWFKGTslRTGQSGVFPGNYVQP 55

helix-rich Mycoplasma protein; Members of this family occur strictly within a subset of Mycoplasma species. Members average 750 amino acids in length, including signal peptide. Sequences are predicted (Jpred 3) to be almost entirely alpha-helical. These sequences show strong periodicity (consistent with long alpha helical structures) and low complexity rich in D,E,N,Q, and K. Genes encoding these proteins are often found in tandem. The function is unknown.

Pssm-ID: 275316 [Multi-domain] Cd Length: 745 Bit Score: 44.63 E-value: 5.82e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    446 QLEWERNRRQELL------NQRNKE-QEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQdircrlTTQRQEIESTNKSre 518
Cdd:TIGR04523  191 KIKNKLLKLELLLsnlkkkIQKNKSlESQISELKKQNNQLKDNIEKKQQEINEKTTEIS------NTQTQLNQLKDEQ-- 262

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    519 lriaeiTHLQQQLQESQQMLGRliPEKQI--LNDQLKQVQ------QNSLHRDSLVTLKRALEAKELARQHLRDQLDEVE 590
Cdd:TIGR04523  263 ------NKIKKQLSEKQKELEQ--NNKKIkeLEKQLNQLKseisdlNNQKEQDWNKELKSELKNQEKKLEEIQNQISQNN 334

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    591 KETRSKLQEIDIFNNQL-----------KELREIHNK-QQLQKQKSMEAERLKQKEQERKIIE--LEKQKEEAQRRAQER 656
Cdd:TIGR04523  335 KIISQLNEQISQLKKELtnsesensekqRELEEKQNEiEKLKKENQSYKQEIKNLESQINDLEskIQNQEKLNQQKDEQI 414

                          250       260       270
                   ....*....|....*....|....*....|....*..
gi 47717123    657 DKQWLEHVQQEDEHQRPRKLHEEEK-----LKREESV 688
Cdd:TIGR04523  415 KKLQQEKELLEKEIERLKETIIKNNseikdLTNQDSV 451

N-terminal Src Homology 3 domain of Ct10 Regulator of Kinase adaptor proteins; CRK adaptor proteins consists of SH2 and SH3 domains, which bind tyrosine-phosphorylated peptides and proline-rich motifs, respectively. They function downstream of protein tyrosine kinases in many signaling pathways started by various extracellular signals, including growth and differentiation factors. Cellular CRK (c-CRK) contains a single SH2 domain, followed by N-terminal and C-terminal SH3 domains. It is involved in the regulation of many cellular processes including cell growth, motility, adhesion, and apoptosis. CRK has been implicated in the malignancy of various human cancers. The N-terminal SH3 domain of CRK binds a number of target proteins including DOCK180, C3G, SOS, and cABL. The CRK family includes two alternatively spliced protein forms, CRKI and CRKII, that are expressed by the CRK gene, and the CRK-like (CRKL) protein, which is expressed by a distinct gene (CRKL). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212692 [Multi-domain] Cd Length: 55 Bit Score: 39.27 E-value: 5.84e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1005 EEFIAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGD-KAGVFPSNYV 1055
Cdd:cd11758    1 EYVRALFDFPGNDDEDLPFKKGEILTVIRKPEEqWWNARNSEgKTGMIPVPYV 53

Src homology 3 domain of Endophilin-B2; Endophilin-B2, also called SH3GLB2 (SH3-domain GRB2-like endophilin B2), is a cytoplasmic protein that interacts with the apoptosis inducer Bax. It is overexpressed in prostate cancer metastasis and has been identified as a cancer antigen with potential utility in immunotherapy. Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. Endophilin-B2 forms homo- and heterodimers (with endophilin-B1) through its BAR domain. The related protein endophilin-B1 interacts with amphiphysin 1 and dynamin 1 through its SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212877 Cd Length: 55 Bit Score: 39.59 E-value: 5.85e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINV--LNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11944    5 LYDYEAADSSELALLADELITVysLPGMDPDWLIGERGNQKGKVPVTYLEL 55

Src Homology 3 domain of Small G protein Signaling Modulator 3; SGSM3 is also called Merlin-associated protein (MAP), RUN and SH3 domain-containing protein (RUSC3), RUN and TBC1 domain-containing protein 3 (RUTBC3), Rab GTPase-activating protein 5 (RabGAP5), or Rab GAP-like protein (RabGAPLP). It is expressed ubiquitously and functions as a regulator of small G protein RAP- and RAB-mediated neuronal signaling. It is involved in modulating NGF-mediated neurite outgrowth and differentiation. It also interacts with the tumor suppressor merlin and may play a role in the merlin-associated suppression of cell growth. SGSM3 contains TBC, SH3, and RUN domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212747 Cd Length: 53 Bit Score: 39.40 E-value: 5.96e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKgewvdeSQTGEPGWLGgELKGKTGWFPANYAE 802
Cdd:cd11813    3 KALLDFERHDDDELGFRKNDIITII------SQKDEHCWVG-ELNGLRGWFPAKFVE 52

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 44.96 E-value: 6.15e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    331 EEPVLEDEQQQLEKKLPVTFEDKKRENfERGNLELEKRRQALLEQQRKEQERLAQLEraeqerKERERQEQERKRQLELE 410
Cdd:pfam02463  272 KENKEEEKEKKLQEEELKLLAKEEEEL-KSELLKLERRKVDDEEKLKESEKEKKKAE------KELKKEKEEIEELEKEL 344

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    411 KQLEKQRELERqreeerrkeierreaAKRELERQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALN--DK 488
Cdd:pfam02463  345 KELEIKREAEE---------------EEEEELEKLQEKLEQLEEELLAKKKLESERLSSAAKLKEEELELKSEEEKeaQL 409

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    489 KHQLEGKLQDIRCRLTTQRQEIESTNKSRelriaeithlqqqlqesqqmlgRLIPEKQILNDQLKQVQQNSLHRDslvtL 568
Cdd:pfam02463  410 LLELARQLEDLLKEEKKEELEILEEEEES----------------------IELKQGKLTEEKEELEKQELKLLK----D 463

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    569 KRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQkQKSMEAERLKQKEQERKIIELEKQKEE 648
Cdd:pfam02463  464 ELELKKSEDLLKETQLVKLQEQLELLLSRQKLEERSQKESKARSGLKVLLAL-IKDGVGGRIISAHGRLGDLGVAVENYK 542


                   ...
gi 47717123    649 AQR 651
Cdd:pfam02463  543 VAI 545

Coiled-coil domain-containing protein 66; This protein family, named Coiled-coil domain-containing protein 66 (CCDC) refers to a protein domain found in eukaryotes, and is approximately 160 amino acids in length. CCDC66 protein is detected mainly in the inner segments of photoreceptors in many vertebrates including mice and humans. It has been found in dogs, that a mutation in the CCDC66 gene causes generalized progressive retinal atrophy (gPRA). This shows that the protein encoded for by this gene is vital for healthy vision and guards against photoreceptor cell degeneration. The structure of CCDC66 proteins includes a heptad repeat pattern which contains at least one coiled-coil domain. There are at least two or more alpha-helices which form a cable-like structure.

Pssm-ID: 434558 [Multi-domain] Cd Length: 154 Bit Score: 42.09 E-value: 6.16e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    364 ELEKRRQALLE------QQRKEQERLAQLERaEQERKERERQEQERKRQLELE---------KQLEKQRELERQREEERR 428
Cdd:pfam15236   46 ERERKRQKALEhqnaikKQLEEKERQKKLEE-ERRRQEEQEEEERLRREREEEqkqfeeerrKQKEKEEAMTRKTQALLQ 124

                           90       100
                   ....*....|....*....|....*
gi 47717123    429 KEIERREAAKRELERQRQLEWERNR 453
Cdd:pfam15236  125 AMQKAQELAQRLKQEQRIRELAEKG 149

Src Homology 3 domain of fungal BOI-like proteins; This subfamily includes the Saccharomyces cerevisiae proteins BOI1 and BOI2, and similar proteins. They contain an N-terminal SH3 domain, a Sterile alpha motif (SAM), and a Pleckstrin homology (PH) domain at the C-terminus. BOI1 and BOI2 interact with the SH3 domain of Bem1p, a protein involved in bud formation. They promote polarized cell growth and participates in the NoCut signaling pathway, which is involved in the control of cytokinesis. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212819 Cd Length: 55 Bit Score: 39.24 E-value: 6.20e-04

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMV---KGEWVDesqtgepGW-LGGELK-GKTGWFPANY 800
Cdd:cd11886    1 LLIVIHDFNARSEDELTLKPGDKIELiedDEEFGD-------GWyLGRNLRtGETGLFPVVF 55

Uncharacterized conserved protein, contains a C-terminal ATPase domain [Function unknown];

Pssm-ID: 443941 [Multi-domain] Cd Length: 1089 Bit Score: 44.91 E-value: 6.24e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  342 LEKklPVTFE--DKKRENFE-----RGNLELEKRRQALLEQQRKEQERLA----QLERAEQERKERERQEQERKRQLeLE 410
Cdd:COG4913  218 LEE--PDTFEaaDALVEHFDdleraHEALEDAREQIELLEPIRELAERYAaareRLAELEYLRAALRLWFAQRRLEL-LE 294

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  411 KQLEKqrelerqreeeRRKEIERREAAKRELERQRQLEweRNRRQELLNQRNKEQ-EDIVVLKAKKKTLEFELEALNDKK 489
Cdd:COG4913  295 AELEE-----------LRAELARLEAELERLEARLDAL--REELDELEAQIRGNGgDRLEQLEREIERLERELEERERRR 361

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  490 HQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEIThlqQQLQESQQMLGRLIPEKQILNDQLKQVQQ--NSL-HRDSLV 566
Cdd:COG4913  362 ARLEALLAALGLPLPASAEEFAALRAEAAALLEALE---EELEALEEALAEAEAALRDLRRELRELEAeiASLeRRKSNI 438

                        250       260
                 ....*....|....*....|....
gi 47717123  567 TlKRALEAKELARQHLrdQLDEVE 590
Cdd:COG4913  439 P-ARLLALRDALAEAL--GLDEAE 459

C2 domain second repeat in Ferlin; Ferlins are involved in vesicle fusion events. Ferlins and other proteins, such as Synaptotagmins, are implicated in facilitating the fusion process when cell membranes fuse together. There are six known human Ferlins: Dysferlin (Fer1L1), Otoferlin (Fer1L2), Myoferlin (Fer1L3), Fer1L4, Fer1L5, and Fer1L6. Defects in these genes can lead to a wide range of diseases including muscular dystrophy (dysferlin), deafness (otoferlin), and infertility (fer-1, fertilization factor-1). Structurally they have 6 tandem C2 domains, designated as (C2A-C2F) and a single C-terminal transmembrane domain, though there is a new study that disputes this and claims that there are actually 7 tandem C2 domains with another C2 domain inserted between C2D and C2E. In a subset of them (Dysferlin, Myoferlin, and Fer1) there is an additional conserved domain called DysF. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 175978 [Multi-domain] Cd Length: 111 Bit Score: 41.02 E-value: 6.35e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1600 VNVVEGIELKpcrsHGKSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIR----DLEQEVLCITVFERDQFSPDDFL 1675
Cdd:cd04011    8 VRVIEARQLV----GGNIDPVVKVEVGGQKKYTSVKKGTNCPFYNEYFFFNFHespdELFDKIIKISVYDSRSLRSDTLI 83

                         90
                 ....*....|
gi 47717123 1676 GRTEIRVADI 1685
Cdd:cd04011   84 GSFKLDVGTV 93

Calcium binding and coiled-coil domain (CALCOCO1) like; Proteins found in this family are similar to the coiled-coil transcriptional coactivator protein coexpressed by Mus musculus (CoCoA/CALCOCO1). This protein binds to a highly conserved N-terminal domain of p160 coactivators, such as GRIP1, and thus enhances transcriptional activation by a number of nuclear receptors. CALCOCO1 has a central coiled-coil region with three leucine zipper motifs, which is required for its interaction with GRIP1 and may regulate the autonomous transcriptional activation activity of the C-terminal region.

Pssm-ID: 462303 [Multi-domain] Cd Length: 488 Bit Score: 44.12 E-value: 6.66e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEKKLPVTFEDKKRENFERGNLELEKRRqalLEQQRKEQERlaQLERAEQE-RKERERQEQERKRQleleKQL 413
Cdd:pfam07888   36 LEECLQERAELLQAQEAANRQREKEKERYKRDREQ---WERQRRELES--RVAELKEElRQSREKHEELEEKY----KEL 106

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    414 EKQRELERQREEERRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKEQEDIVVlkAKKKTLEFELEALNDKKHQLE 493
Cdd:pfam07888  107 SASSEELSEEKDALLAQRAAHEARIRELEEDIKTLTQRVLERETELERMKERAKKAG--AQRKEEEAERKQLQAKLQQTE 184

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    494 GKLqdirCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQ--NSLHRdSLVTLKRA 571
Cdd:pfam07888  185 EEL----RSLSKEFQELRNSLAQRDTQVLQLQDTITTLTQKLTTAHRKEAENEALLEELRSLQErlNASER-KVEGLGEE 259

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    572 LEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIELEK--QKEEA 649
Cdd:pfam07888  260 LSSMAAQRDRTQAELHQARLQAAQLTLQLADASLALREGRARWAQERETLQQSAEADKDRIEKLSAELQRLEErlQEERM 339

                          330
                   ....*....|....
gi 47717123    650 QRR------AQERD 657
Cdd:pfam07888  340 EREklevelGREKD 353

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF16 and ARHGEF26; ARHGEF16, also called ephexin-4, acts as a GEF for RhoG, activating it by exchanging bound GDP for free GTP. RhoG is a small GTPase that is a crucial regulator of Rac in migrating cells. ARHGEF16 interacts directly with the ephrin receptor EphA2 and mediates cell migration and invasion in breast cancer cells by activating RhoG. ARHGEF26, also called SGEF (SH3 domain-containing guanine exchange factor), also activates RhoG. It is highly expressed in liver and may play a role in regulating membrane dynamics. ARHGEF16 and ARHGEF26 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212871 Cd Length: 55 Bit Score: 39.44 E-value: 6.68e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1080 QVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGKKrqiGWFPANYVK 1134
Cdd:cd11938    3 EIIKAYTAKQPDELSLQQADVVLVLQTESDGWYYGERLRDGER---GWFPSSCAK 54

Src homology 3 domain of Alpha Spectrin; Spectrin is a major structural component of the red blood cell membrane skeleton and is important in erythropoiesis and membrane biogenesis. It is a flexible, rope-like molecule composed of two subunits, alpha and beta, which consist of many spectrin-type repeats. Alpha and beta spectrin associate to form heterodimers and tetramers; spectrin tetramer formation is critical for red cell shape and deformability. Defects in alpha spectrin have been associated with inherited hemolytic anemias including hereditary spherocytosis (HSp), hereditary elliptocytosis (HE), and hereditary pyropoikilocytosis (HPP). Alpha spectrin contains a middle SH3 domain and a C-terminal EF-hand binding motif in addition to multiple spectrin repeats. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212742 [Multi-domain] Cd Length: 53 Bit Score: 39.39 E-value: 6.78e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVK 967
Cdd:cd11808    4 ALYDYQEKSPREVSMKKGDILTLLNSSNKdWWKVEVNDRQGFVPAAYVK 52

Second Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the second SH3 domain, located C-terminal of the first SH3 domain at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212865 Cd Length: 57 Bit Score: 39.44 E-value: 6.78e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1009 AMYTYE-----SSEQGD-LTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11932    4 ALYNFDlkeknREESKDcLKFQKDDIITVISRvDENWAEGKLGDQVGIFPILFV 57

Src homology 3 domain of Type I fungal Myosins; Type I myosins (myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Saccharomyces cerevisiae has two myosins-I, Myo3 and Myo5, which are involved in endocytosis and the polarization of the actin cytoskeleton. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212792 [Multi-domain] Cd Length: 55 Bit Score: 39.29 E-value: 6.86e-04

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGW-LGGELKG-KTGWFPANYAE 802
Cdd:cd11858    2 YKALYDFAGSVANELSLKKDDIVYI-------VQKEDNGWwLAKKLDEsKEGWVPAAYLE 54

Src homology 3 domain of Ysc84p and similar fungal proteins; This family is composed of the Saccharomyces cerevisiae proteins, Ysc84p (also called LAS17-binding protein 4, Lsb4p) and Lsb3p, and similar fungal proteins. They contain an N-terminal SYLF domain (also called DUF500) and a C-terminal SH3 domain. Ysc84p localizes to actin patches and plays an important in actin polymerization during endocytosis. The N-terminal domain of both Ysc84p and Lsb3p can bind and bundle actin filaments. A study of the yeast SH3 domain interactome predicts that the SH3 domains of Lsb3p and Lsb4p may function as molecular hubs for the assembly of endocytic complexes. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212776 [Multi-domain] Cd Length: 55 Bit Score: 39.33 E-value: 6.88e-04

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMV--KGEWVDEsqtgepgWLGGELKGKTGWFPANYAE 802
Cdd:cd11842    1 KAVALYDFAGEQPGDLAFQKGDIITIlkKSDSQND-------WWTGRIGGREGIFPANYVE 54

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 39.28 E-value: 6.90e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11824    1 KYSVLYDYTAQEDDELSISKGDVVAVIEKGEDgWWTVERNGQKGLVPGTYL 51

Src Homology 3 domain of Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2-Like 2; BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. It contains an N-terminal IMD or Inverse-Bin/Amphiphysin/Rvs (I-BAR) domain, an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The related proteins, BAIAP2L1 and IRSp53, function as regulators of membrane dynamics and the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212847 [Multi-domain] Cd Length: 59 Bit Score: 39.41 E-value: 6.92e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1080 QVIASYTATG-PEQLTLAPGQLILIRKKNP-GGWWEGELQarGKKRQiGWFPANYVKLL 1136
Cdd:cd11914    4 RAIVSHPAGSnPTLLRFNRGDIITVLVPEArNGWLYGKLE--GSSRQ-GWFPEAYVKAL 59

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 3 (Stac3); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212919 [Multi-domain] Cd Length: 53 Bit Score: 39.12 E-value: 6.97e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVL-EQQDMWWFGEVQGQKGWFPKSYV 966
Cdd:cd11986    4 ALYRFKALEKDDLDFHPGERITVIdDSNEEWWRGKIGEKTGYFPMNFI 51

C2 domain first repeat present in RasA2 and RasA3; RasA2 and RasA3 are GAP1s (GTPase activating protein 1s ), Ras-specific GAP members, which suppresses Ras function by enhancing the GTPase activity of Ras proteins resulting in the inactive GDP-bound form of Ras. In this way it can control cellular proliferation and differentiation. RasA2 and RasA3 are both inositol 1,3,4,5-tetrakisphosphate-binding proteins and contain an N-terminal C2 domain, a Ras-GAP domain, a pleckstrin-homology (PH) domain which localizes it to the plasma membrane, and Bruton's Tyrosine Kinase (BTK) a zinc binding domain. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176046 [Multi-domain] Cd Length: 121 Bit Score: 41.27 E-value: 7.23e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1598 LMVNVVEGIELKPcRSHGKS--NPYCEVTMgSQCHI--TKTIQDTLNPKWNSNCQFFI-RDLEQevLCITVFERDQFSPD 1672
Cdd:cd08401    2 LKIKIGEAKNLPP-RSGPNKmrDCYCTVNL-DQEEVfrTKTVEKSLCPFFGEDFYFEIpRTFRH--LSFYIYDRDVLRRD 77

                         90
                 ....*....|....*....
gi 47717123 1673 DFLGRTEIRVADIKKDQGS 1691
Cdd:cd08401   78 SVIGKVAIKKEDLHKYYGK 96

Fourth N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP bind the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212731 Cd Length: 50 Bit Score: 38.94 E-value: 7.37e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKGewvdesqTGEPGWLGGELKGKTGWFP 797
Cdd:cd11797    1 YGVALYRFQALEPNELDFEVGDRIRIIA-------TLEDGWLEGELKGRRGIFP 47

Second Src homology 3 domain (or SH3B) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212923 [Multi-domain] Cd Length: 52 Bit Score: 39.25 E-value: 7.40e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGgWWEGELqaRGKKrqiGWFPANYVKL 1135
Cdd:cd11990    2 AQALCSWTAKKDNHLNFSKNDIITVLEQQEN-WWFGEV--HGGR---GWFPKSYVKL 52

Src Homology 3 domain of Cdc42-Interacting Protein 4; This subfamily is composed of Cdc42-Interacting Protein 4 (CIP4), Formin Binding Protein 17 (FBP17), FormiN Binding Protein 1-Like (FNBP1L), and similar proteins. CIP4 and FNBP1L are Cdc42 effectors that bind Wiskott-Aldrich syndrome protein (WASP) and function in endocytosis. CIP4 and FBP17 bind to the Fas ligand and may be implicated in the inflammatory response. CIP4 may also play a role in phagocytosis. It functions downstream of Cdc42 in PDGF-dependent actin reorganization and cell migration, and also regulates the activity of PDGFRbeta. It uses Src as a substrate in regulating the invasiveness of breast tumor cells. CIP4 may also play a role in the pathogenesis of Huntington's disease. Members of this subfamily typically contain an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs) domain, a central Cdc42-binding HR1 domain, and a C-terminal SH3 domain. The SH3 domain of CIP4 associates with Gapex-5, a Rab31 GEF. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212844 [Multi-domain] Cd Length: 55 Bit Score: 39.17 E-value: 7.41e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWW----KGevNGQVGLFPSNYVKL 1211
Cdd:cd11911    1 TCTALYDFDGTSEGTLSMEEGEILLVLEEDGGDGWtrvrKN--NGDEGYVPTSYIEV 55

Protein of unknown function (DUF3584); This protein is found in bacteria and eukaryotes. Proteins in this family are typically between 943 to 1234 amino acids in length. This family contains a P-loop motif suggesting it is a nucleotide binding protein. It may be involved in replication.

Pssm-ID: 432349 [Multi-domain] Cd Length: 1191 Bit Score: 44.44 E-value: 7.49e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    331 EEPVLEDEQQQLEKKLPVTFE--DKKRENFERGNLELEKRRQALLEQQRKE----------QERLAQL--------ERAE 390
Cdd:pfam12128  591 DVPEWAASEEELRERLDKAEEalQSAREKQAAAEEQLVQANGELEKASREEtfartalknaRLDLRRLfdekqsekDKKN 670

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    391 QERKERERQEQERKRQLELE-KQLEKQRELERQREEERrkeierreaaKRELERQRQLEWernrrQELLNQRNKEQEDIV 469
Cdd:pfam12128  671 KALAERKDSANERLNSLEAQlKQLDKKHQAWLEEQKEQ----------KREARTEKQAYW-----QVVEGALDAQLALLK 735

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    470 VLKAKKKT-LEFELEALN-DKKHQLEGKLQD--IRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQEsqqmlgRLIPEK 545
Cdd:pfam12128  736 AAIAARRSgAKAELKALEtWYKRDLASLGVDpdVIAKLKREIRTLERKIERIAVRRQEVLRYFDWYQE------TWLQRR 809

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    546 QILNDQLKQVQQNSLH-RDSLVTL----KRALEAKELARQHLRDQLDEVEKEtrskLQEIDIFNNQLKELREIHNKQQLQ 620
Cdd:pfam12128  810 PRLATQLSNIERAISElQQQLARLiadtKLRRAKLEMERKASEKQQVRLSEN----LRGLRCEMSKLATLKEDANSEQAQ 885

                          330       340       350       360       370       380
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123    621 KQKSmeaERLKQKEQERKIIELE----KQKEE------AQRRAQERDKQWLEHvqQEDEHQRPRKL 676
Cdd:pfam12128  886 GSIG---ERLAQLEDLKLKRDYLsesvKKYVEhfknviADHSGSGLAETWESL--REEDHYQNDKG 946

Borrelia P83/100 protein; This family consists of several Borrelia P83/P100 antigen proteins.

Pssm-ID: 114011 [Multi-domain] Cd Length: 489 Bit Score: 44.22 E-value: 7.60e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    541 LIP-EKQILNDQLKQVQQNSLHRDSLVtlKRALEAKELARQHLRDQLD--EVEKETRSKLQEIDIFNNQLKELREIHNKQ 617
Cdd:pfam05262  157 VIPlKKNILSGNVSDVDTDSISDKKVV--EALREDNEKGVNFRRDMTDlkERESQEDAKRAQQLKEELDKKQIDADKAQQ 234

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    618 QLQ-KQKSMEAER--LKQKEQERKIIELEKQKEEAQ--RRAQERDKQWLEHVQQE----DEHQRPRKLHEEEKLKREesv 688
Cdd:pfam05262  235 KADfAQDNADKQRdeVRQKQQEAKNLPKPADTSSPKedKQVAENQKREIEKAQIEikknDEEALKAKDHKAFDLKQE--- 311

                          170
                   ....*....|....*.
gi 47717123    689 kkkdgEEKGKQEAQDK 704
Cdd:pfam05262  312 -----SKASEKEAEDK 322

C-terminal Src Homology 3 domain of Ct10 Regulator of Kinase adaptor proteins; CRK adaptor proteins consists of SH2 and SH3 domains, which bind tyrosine-phosphorylated peptides and proline-rich motifs, respectively. They function downstream of protein tyrosine kinases in many signaling pathways started by various extracellular signals, including growth and differentiation factors. Cellular CRK (c-CRK) contains a single SH2 domain, followed by N-terminal and C-terminal SH3 domains. It is involved in the regulation of many cellular processes including cell growth, motility, adhesion, and apoptosis. CRK has been implicated in the malignancy of various human cancers. The C-terminal SH3 domain of CRK has not been shown to bind any target protein; it acts as a negative regulator of CRK function by stabilizing a structure that inhibits the access by target proteins to the N-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212693 [Multi-domain] Cd Length: 57 Bit Score: 39.01 E-value: 7.65e-04

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1076 PEIAQVIASY--TATGPEQLTLAPGQLILIRKKNPGGWWEGELqaRGKKrqiGWFPANYVKL 1135
Cdd:cd11759    1 PAYARVIQKRvpNAYDKTALALEVGDLVKVTKINVSGQWEGEL--NGKV---GHFPFTHVEL 57

Src homology 3 domain of Ubiquitin-associated and SH3 domain-containing protein A; UBASH3A is also called Cbl-Interacting Protein 4 (CLIP4), T cell Ubiquitin LigAnd (TULA), or T cell receptor Signaling (STS)-2. It is only found in lymphoid cells and exhibits weak phosphatase activity. UBASH3A facilitates T cell-induced apoptosis through interaction with the apoptosis-inducing factor AIF. It is involved in regulating the level of phosphorylation of the zeta-associated protein (ZAP)-70 tyrosine kinase. TULA proteins contain an N-terminal UBA domain, a central SH3 domain, and a C-terminal histidine phosphatase domain. They bind c-Cbl through the SH3 domain and to ubiquitin via UBA. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212870 [Multi-domain] Cd Length: 60 Bit Score: 39.23 E-value: 7.66e-04

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVmvkgeWVDESQTGE--PGWLGG--ELKGKTGWFPANYAEK 803
Cdd:cd11937    4 RALFQYKPQNIDELMLSPGDYI-----FVDPTQQSEasEGWVIGisHRTGCRGFLPENYTER 60

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 39.30 E-value: 7.75e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKGEwvdESQTGEPGWLGGELKGKTGWFPA 798
Cdd:cd11762    1 LVRALYDYEAQSDEELSFPEGAIIRILRK---DDNGVDDGWWEGEFNGRVGVFPS 52

hypothetical protein; Provisional

Pssm-ID: 237178 [Multi-domain] Cd Length: 508 Bit Score: 43.93 E-value: 7.80e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   339 QQQLEKKLPVTFEDKKRENfERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKER---ERQEQERKRQLELEKQLEK 415
Cdd:PRK12705   28 RQRLAKEAERILQEAQKEA-EEKLEAALLEAKELLLRERNQQRQEARREREELQREEErlvQKEEQLDARAEKLDNLENQ 106

                          90       100       110       120       130       140
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123   416 QRELERQREEERRKEIERREAAKRELERQRQLEWERnRRQELLNQRNKEQEDIVVLKAKKKTLEFELEA 484
Cdd:PRK12705  107 LEEREKALSARELELEELEKQLDNELYRVAGLTPEQ-ARKLLLKLLDAELEEEKAQRVKKIEEEADLEA 174

Glutamine-rich N-terminal helical domain of HDAC9, a Class IIa histone deacetylase; This family consists of the glutamine-rich domain of histone deacetylase 9 (HDAC9). It belongs to a superfamily that consists of the glutamine-rich N-terminal helical extension to certain Class IIa histone deacetylases (HDACs), including HDAC4, HDAC5 and HDCA9; it is missing from HDAC7. This domain confers responsiveness to calcium signals and mediates interactions with transcription factors and cofactors, and it is able to repress transcription independently of the HDAC C-terminal, zinc-dependent catalytic domain. It has many intra- and inter-helical interactions which are possibly involved in reversible assembly and disassembly of proteins. HDACs regulate diverse cellular processes through enzymatic deacetylation of histone as well as non-histone proteins, in particular deacetylating N(6)-acetyl-lysine residues.

Pssm-ID: 197399 [Multi-domain] Cd Length: 90 Bit Score: 40.12 E-value: 7.86e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  326 DQRLPEEPVLEDEQQQLEKKLPVTFEDKKRENFER---GNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQE 402
Cdd:cd10163    6 EKQLQQELLLIQQQQQIQKQLLIAEFQKQHENLTRqhqAQLQEHLKLQQELLAMKQQQELLEKEQKLEQQRQEQELERHR 85


                 ....*
gi 47717123  403 RKRQL 407
Cdd:cd10163   86 REQQL 90

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 3; Shank3, also called ProSAP2 (Proline-rich synapse-associated protein 2), is widely expressed. It plays a role in the formation of dendritic spines and synapses. Haploinsufficiency of the Shank3 gene causes the 22q13 deletion/Phelan-McDermid syndrome, and variants of Shank3 have been implicated in autism spectrum disorder, schizophrenia, and intellectual disability. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212917 Cd Length: 52 Bit Score: 39.16 E-value: 8.11e-04

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1161 IGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11984    4 IAVKAYSPQGEGEIQLNRGERVKVLSIGEGGFWEGTVKGRTGWFPADCV 52

N-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also have roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212880 [Multi-domain] Cd Length: 52 Bit Score: 39.01 E-value: 8.19e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVTKKDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11947    1 EARGKFDFTASGEDELSFKKGDVLKILSSDDIWFKAELNGEEGYVPKNFV 50

Guanylate-binding protein, C-terminal domain; Transcription of the anti-viral guanylate-binding protein (GBP) is induced by interferon-gamma during macrophage induction. This family contains GBP1 and GPB2, both GTPases capable of binding GTP, GDP and GMP.

Pssm-ID: 460721 [Multi-domain] Cd Length: 297 Bit Score: 43.43 E-value: 8.48e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    563 DSLVTLKRALEAKELARQHLRDQLDEVEKETRSkLQEIDIFNNQLKELREIHNKQQL-QKQKSMEAER----------LK 631
Cdd:pfam02841  190 EAILQTDQALTAKEKAIEAERAKAEAAEAEQEL-LREKQKEEEQMMEAQERSYQEHVkQLIEKMEAEReqllaeqermLE 268

                           90       100
                   ....*....|....*....|....
gi 47717123    632 QKEQERKIIELEKQKEEAQRRAQE 655
Cdd:pfam02841  269 HKLQEQEELLKEGFKTEAESLQKE 292

Src Homology 3 domain of Membrane Protein, Palmitoylated 2 (or MAGUK p55 subfamily member 2); MPP2 is a scaffolding protein that interacts with the non-receptor tyrosine kinase c-Src in epithelial cells to negatively regulate its activity and morphological function. It is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212970 Cd Length: 59 Bit Score: 39.16 E-value: 8.97e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1164 YDYTAQNDD-------ELAFNKGQIINVLNKEDPDWWKG--EVNGQVGLFPS 1206
Cdd:cd12037    6 FDYDPSSDSlipckeaGLKFRAGDLLQIVNQEDPNWWQAchVEGGSAGLIPS 57

Third Src Homology 3 domain of Nck adaptor proteins; This group contains the third SH3 domain of Nck, the first SH3 domain of Caenorhabditis elegans Ced-2 (Cell death abnormality protein 2), and similar domains. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. Ced-2 is a cell corpse engulfment protein that interacts with Ced-5 in a pathway that regulates the activation of Ced-10, a Rac small GTPase.

Pssm-ID: 212701 [Multi-domain] Cd Length: 56 Bit Score: 38.83 E-value: 9.02e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQ---QDMWWFGE-VQGQKGWFPKSYVKL 968
Cdd:cd11767    2 VVALYPFTGENDEELSFEKGERLEIIEKpedDPDWWKARnALGTTGLVPRNYVEV 56

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 44.29 E-value: 9.20e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    547 ILNDQLKQVQQNSLHR---DSLVTLKRALEAKELA---------RQHLRDQLDEVEKetrsklqEIDIFNNQLKELR-EI 613
Cdd:TIGR02169  195 EKRQQLERLRREREKAeryQALLKEKREYEGYELLkekealerqKEAIERQLASLEE-------ELEKLTEEISELEkRL 267

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    614 HNKQQLQKQKSMEAERLKQKEQ---ERKIIELEKQKEEAQR--RAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKR--EE 686
Cdd:TIGR02169  268 EEIEQLLEELNKKIKDLGEEEQlrvKEKIGELEAEIASLERsiAEKERELEDAEERLAKLEAEIDKLLAEIEELEReiEE 347

                          170       180       190
                   ....*....|....*....|....*....|.
gi 47717123    687 SVKKKDGEEKGKQEAQDKLGRLFHQHQEPAK 717
Cdd:TIGR02169  348 ERKRRDKLTEEYAELKEELEDLRAELEEVDK 378

Septal ring factor EnvC, activator of murein hydrolases AmiA and AmiB [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 443969 [Multi-domain] Cd Length: 377 Bit Score: 43.60 E-value: 9.48e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  484 ALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEITHLqqqlqesqqmlgrlipEKQI--LNDQLKQVQQNslh 561
Cdd:COG4942   17 AQADAAAEAEAELEQLQQEIAELEKELAALKKEEKALLKQLAAL----------------ERRIaaLARRIRALEQE--- 77

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  562 rdsLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIE 641
Cdd:COG4942   78 ---LAALEAELAELEKEIAELRAELEAQKEELAELLRALYRLGRQPPLALLLSPEDFLDAVRRLQYLKYLAPARREQAEE 154

                        170       180       190       200       210       220
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  642 LEKQKEE--AQRRAQERDKQWLEHVQQEDEHQRpRKLhEEEKLKREESVKKKDGEEKGKQEAQDKLGR 707
Cdd:COG4942  155 LRADLAElaALRAELEAERAELEALLAELEEER-AAL-EALKAERQKLLARLEKELAELAAELAELQQ 220

Src Homology 3 domain of Cdc42-Interacting Protein 4, Bzz1 and similar domains; This subfamily is composed of Cdc42-Interacting Protein 4 (CIP4) and similar proteins such as Formin Binding Protein 17 (FBP17) and FormiN Binding Protein 1-Like (FNBP1L), as well as yeast Bzz1 (or Bzz1p). CIP4 and FNBP1L are Cdc42 effectors that bind Wiskott-Aldrich syndrome protein (WASP) and function in endocytosis. CIP4 and FBP17 bind to the Fas ligand and may be implicated in the inflammatory response. CIP4 may also play a role in phagocytosis. Bzz1 is also a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Members of this subfamily contain an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs) domain as well as at least one C-terminal SH3 domain. Bzz1 contains a second SH3 domain at the C-terminus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212711 [Multi-domain] Cd Length: 55 Bit Score: 38.74 E-value: 9.52e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVTKKD-GDWWTGTVGDKA--GVFPSNYVRL 1057
Cdd:cd11777    1 ECKALYAFVGSSEGTISMTEGEKLSLVEEDkGDGWTRVRRDTGeeGYVPTSYIRI 55

Membrane protein TolA involved in colicin uptake [Cell wall/membrane/envelope biogenesis];

Pssm-ID: 442298 [Multi-domain] Cd Length: 485 Bit Score: 43.87 E-value: 9.75e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  349 TFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKQLEK------QRELERQ 422
Cdd:COG3064    4 ALEEKAAEAAAQERLEQAEAEKRAAAEAEQKAKEEAEEERLAELEAKRQAEEEAREAKAEAEQRAAElaaeaaKKLAEAE 83

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  423 REEERRKEIERREAAKRELERQRQLEWERNR---RQELLNQRNKEQEDIVVLKAKKKTLEFELEAlndKKHQLEGKLQDI 499
Cdd:COG3064   84 KAAAEAEKKAAAEKAKAAKEAEAAAAAEKAAaaaEKEKAEEAKRKAEEEAKRKAEEERKAAEAEA---AAKAEAEAARAA 160

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  500 RCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRDSLVTLKRALEAKELAR 579
Cdd:COG3064  161 AAAAAAAAAAAARAAAGAAAALVAAAAAAVEAADTAAAAAAALAAAAAAAAADAALLALAVAARAAAASREAALAAVEAT 240

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  580 QHLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQ 659
Cdd:COG3064  241 EEAALGGAEEAADLAAVGVLGAALAAAAAGAAALSSGLVVVAAALAGLAAAAAGLVLDDSAALAAELLGAVAAEEAVLAA 320

                        330       340       350       360       370       380       390       400
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  660 WLEHVQQEDEHQRPRKLHEEEKLKREESVKKKDGEEKGKQEAQDKLGRLFHQHQEPAKPAVQAPWSTAEKGPLTISAQEN 739
Cdd:COG3064  321 AAAAGALVVRGGGAASLEAALSLLAAGAAAAAAGAGALATGALGDALAAEAAGALLLGKLADVEEAAGAGILAAAGGGGL 400

                        410       420       430       440       450
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  740 VKVVYYRALYPFESRSHDEITIQPGDIVMVKGEWVDESQTGEPGWLGGELKGKT 793
Cdd:COG3064  401 LGLRLDLGAALLEAASAVELRVLLALAGAAGAVVALLVKLVADLAGGLVGIGKA 454

C2 domain first repeat in Copine; There are 2 copies of the C2 domain present in copine, a protein involved in membrane trafficking, protein-protein interactions, and perhaps even cell division and growth. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176013 [Multi-domain] Cd Length: 120 Bit Score: 40.63 E-value: 9.83e-04

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1616 KSNPYCEVTMGSQCHI-------TKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQFSPD----DFLGRTEIRVAD 1684
Cdd:cd04048   20 KSDPFVVVYVKTGGSGqwveigrTEVIKNNLNPDFVTTFTVDYYFEEVQKLRFEVYDVDSKSKDlsdhDFLGEAECTLGE 99

                         90       100
                 ....*....|....*....|...
gi 47717123 1685 IkkdQGSKGPVTKCLLLHEVPTG 1707
Cdd:cd04048  100 I---VSSPGQKLTLPLKGGKGKG 119

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 38.89 E-value: 9.84e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGElqargKKRQIGWFPANYVKL 1135
Cdd:cd11824    2 YSVLYDYTAQEDDELSISKGDVVAVIEKGEDGWWTVE-----RNGQKGLVPGTYLEK 53

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 39.03 E-value: 9.86e-04

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQ------DMWWFGEVQGQKGWFPKSYV 966
Cdd:cd11876    4 ALFDYDARGEDELTLRRGQPVEVLSKDaavsgdEGWWTGKIGDKVGIFPSNYV 56

Coiled-coil domain-containing protein 66; This protein family, named Coiled-coil domain-containing protein 66 (CCDC) refers to a protein domain found in eukaryotes, and is approximately 160 amino acids in length. CCDC66 protein is detected mainly in the inner segments of photoreceptors in many vertebrates including mice and humans. It has been found in dogs, that a mutation in the CCDC66 gene causes generalized progressive retinal atrophy (gPRA). This shows that the protein encoded for by this gene is vital for healthy vision and guards against photoreceptor cell degeneration. The structure of CCDC66 proteins includes a heptad repeat pattern which contains at least one coiled-coil domain. There are at least two or more alpha-helices which form a cable-like structure.

Pssm-ID: 434558 [Multi-domain] Cd Length: 154 Bit Score: 41.32 E-value: 9.99e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    585 QLDEVEKETRSKLQEIDIFNNQLKELREIH--NKQQLQKQKSMEAERL-KQKEQERKIIELE----KQKEEAQRRAQERD 657
Cdd:pfam15236   43 QLEERERKRQKALEHQNAIKKQLEEKERQKklEEERRRQEEQEEEERLrREREEEQKQFEEErrkqKEKEEAMTRKTQAL 122

                           90       100
                   ....*....|....*....|....*.
gi 47717123    658 KQWLEHVQQ--EDEHQRPRKLHEEEK 681
Cdd:pfam15236  123 LQAMQKAQElaQRLKQEQRIRELAEK 148

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 38.84 E-value: 1.00e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQ---QDMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd11977    3 AVARYNFAARDMRELSLREGDVVRIYSRiggDQGWWKGETNGRIGWFPSTYVE 55

Second Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212857 Cd Length: 56 Bit Score: 38.79 E-value: 1.00e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1080 QVIASYTATG--PEQLTLAPGQLI-LIRKKNpGGWWEGELQARGKKrqiGWFPANYVKL 1135
Cdd:cd11924    2 EAVAQYTFKGdlEVELSFRKGEHIcLIRKVN-ENWYEGRITGTGRQ---GIFPASYVQV 56

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 38.98 E-value: 1.00e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQ------DMWWFGEVQGQKGWFPKSYV 966
Cdd:cd12059    4 AVFDYEASAEDELTLRRGDRVEVLSKDsavsgdEGWWTGKINDRVGIFPSNYV 56

Uncharacterized conserved protein, contains a C-terminal ATPase domain [Function unknown];

Pssm-ID: 443941 [Multi-domain] Cd Length: 1089 Bit Score: 44.14 E-value: 1.01e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  548 LNDQLKQVQQNSLHRDSLVTLKRALE---------------AKELARqhLRDQLDEVEKeTRSKLQEIDIfnnQLKELRE 612
Cdd:COG4913  626 LAEAEERLEALEAELDALQERREALQrlaeyswdeidvasaEREIAE--LEAELERLDA-SSDDLAALEE---QLEELEA 699

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  613 IHN-----KQQLQKQKSMEAERLKQKEQERKiiELEKQKEEAQRRAQERDKQWLE-HVQQEDEHQRPRKLHE--EEKLKR 684
Cdd:COG4913  700 ELEeleeeLDELKGEIGRLEKELEQAEEELD--ELQDRLEAAEDLARLELRALLEeRFAAALGDAVERELREnlEERIDA 777

                        170       180       190
                 ....*....|....*....|....*....|
gi 47717123  685 EESvkkkdgeekGKQEAQDKLGRLFHQHQE 714
Cdd:COG4913  778 LRA---------RLNRAEEELERAMRAFNR 798

MAP7 (E-MAP-115) family; The organization of microtubules varies with the cell type and is presumably controlled by tissue-specific microtubule-associated proteins (MAPs). The 115-kDa epithelial MAP (E-MAP-115/MAP7) has been identified as a microtubule-stabilising protein predominantly expressed in cell lines of epithelial origin. The binding of this microtubule associated protein is nucleotide independent.

Pssm-ID: 461709 [Multi-domain] Cd Length: 153 Bit Score: 41.56 E-value: 1.02e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    338 EQQQLEkklpvtfEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKQLEKQR 417
Cdd:pfam05672   25 EQRERE-------EQERLEKEEEERLRKEELRRRAEEERARREEEARRLEEERRREEEERQRKAEEEAEEREQREQEEQE 97

                           90       100       110       120       130
                   ....*....|....*....|....*....|....*....|....*....|.
gi 47717123    418 ELERqrEEERRKEIERREAAKRELERQRQLEWERNRRQEllnqRNKEQEDI 468
Cdd:pfam05672   98 RLQK--QKEEAEAKAREEAERQRQEREKIMQQEEQERLE----RKKRIEEI 142

RNase Y N-terminal region;

Pssm-ID: 463456 [Multi-domain] Cd Length: 201 Bit Score: 42.18 E-value: 1.04e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    338 EQQQLEKKLPVTFE--DKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKER-ER-----QEQERKRQL-E 408
Cdd:pfam12072   79 ELQRQERRLLQKEEtlDRKDESLEKKEESLEKKEKELEAQQQQLEEKEEELEELIEEQRQElERisgltSEEAKEILLdE 158


                   ....*..
gi 47717123    409 LEKQLEK 415
Cdd:pfam12072  159 VEEELRH 165

helix-rich Mycoplasma protein; Members of this family occur strictly within a subset of Mycoplasma species. Members average 750 amino acids in length, including signal peptide. Sequences are predicted (Jpred 3) to be almost entirely alpha-helical. These sequences show strong periodicity (consistent with long alpha helical structures) and low complexity rich in D,E,N,Q, and K. Genes encoding these proteins are often found in tandem. The function is unknown.

Pssm-ID: 275316 [Multi-domain] Cd Length: 745 Bit Score: 43.86 E-value: 1.04e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    452 NRRQELLNQRNKEQEDIVVLKAKKKTLEFEL-------EALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEI 524
Cdd:TIGR04523   33 TEEKQLEKKLKTIKNELKNKEKELKNLDKNLnkdeekiNNSNNKIKILEQQIKDLNDKLKKNKDKINKLNSDLSKINSEI 112

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    525 THLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRDSLVTLKRAlEAKELARQ--HLRDQLDEVEKETRSKLQEIDI 602
Cdd:TIGR04523  113 KNDKEQKNKLEVELNKLEKQKKENKKNIDKFLTEIKKKEKELEKLNN-KYNDLKKQkeELENELNLLEKEKLNIQKNIDK 191

                          170       180       190       200       210       220
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123    603 FNNQL--KELREIHNKQQLQKQKSMEAERLKQKEQErkiIELEKQKEEAQRRAQERDKQwLEHVQQE 667
Cdd:TIGR04523  192 IKNKLlkLELLLSNLKKKIQKNKSLESQISELKKQN---NQLKDNIEKKQQEINEKTTE-ISNTQTQ 254

Uncharacterized conserved protein YhaN, contains AAA domain [Function unknown];

Pssm-ID: 443752 [Multi-domain] Cd Length: 641 Bit Score: 43.60 E-value: 1.08e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  409 LEKQLEKQRElerqreeerrkeierreaakrELERQRQLEWERNrrqelLNQRNKEQEDIVVLKAKKKtlefELEALNDK 488
Cdd:COG4717   47 LLERLEKEAD---------------------ELFKPQGRKPELN-----LKELKELEEELKEAEEKEE----EYAELQEE 96

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  489 KHQLEGKLQDIRCRLTTQRQEIESTNKSRELRiaeithlqqqlqesqqmlgRLIPEKQILNDQLKQVQQNslhrdslvtl 568
Cdd:COG4717   97 LEELEEELEELEAELEELREELEKLEKLLQLL-------------------PLYQELEALEAELAELPER---------- 147

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  569 KRALEAKELARQHLRDQLDEVEKETRSKLQEIDifnnQLKELREIHNKQQLQKQKSmEAERLKQKEQERKiIELEKQKEE 648
Cdd:COG4717  148 LEELEERLEELRELEEELEELEAELAELQEELE----ELLEQLSLATEEELQDLAE-ELEELQQRLAELE-EELEEAQEE 221

                        250       260
                 ....*....|....*....|...
gi 47717123  649 AQRRAQERDKQWLEHVQQEDEHQ 671
Cdd:COG4717  222 LEELEEELEQLENELEAAALEER 244

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 38.72 E-value: 1.09e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  749 YPFESRSHDEITIQPGDIVM-VKGEwvdesqtgEPGWLGGELKGKTGWFPANY 800
Cdd:cd12052    6 FDYKAQHEDELTITVGDIITkIKKD--------DGGWWEGEIKGRRGLFPDNF 50

Third N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212730 Cd Length: 51 Bit Score: 38.49 E-value: 1.09e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwvdesqtGEPGWLGGELKGKTGWFPANY 800
Cdd:cd11796    3 RVLQDLSAQLDEELDLREGDVVTITGI-------LDKGWFRGELNGRRGIFPEGF 50

Src homology 3 domain of SH3 protein interacting with Nck, 90 kDa (SPIN90); SPIN90 is also called NCK interacting protein with SH3 domain (NCKIPSD), Dia-interacting protein (DIP), 54 kDa vimentin-interacting protein (VIP54), or WASP-interacting SH3-domain protein (WISH). It is an F-actin binding protein that regulates actin polymerization and endocytosis. It associates with the Arp2/3 complex near actin filaments and determines filament localization at the leading edge of lamellipodia. SPIN90 is expressed in the early stages of neuronal differentiation and plays a role in regulating growth cone dynamics and neurite outgrowth. It also interacts with IRSp53 and regulates cell motility by playing a role in the formation of membrane protrusions. SPIN90 contains an N-terminal SH3 domain, a proline-rich domain, and a C-terminal VCA (verprolin-homology and cofilin-like acidic) domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212783 [Multi-domain] Cd Length: 53 Bit Score: 38.45 E-value: 1.10e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWK-GEVNGQVGLFPSNYVK 1210
Cdd:cd11849    5 LYDFKSAEPNTLSFSEGETFLLLERSNAHWWLvTNHSGETGYVPANYVK 53

First Src Homology 3 domain (SH3A) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CD2AP. SH3A binds to the PXXXPR motif present in c-Cbl and the cytoplasmic domain of cell adhesion protein CD2. Its interaction with CD2 anchors CD2 at sites of cell contact. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212986 Cd Length: 56 Bit Score: 38.67 E-value: 1.13e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILVTKK--DGDWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd12053    1 EYIVEYDYDAVHEDELTIRVGEIIRNVKKleEEGWLEGELNGRRGMFPDNFVK 53

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 38.53 E-value: 1.20e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGDVILV-TKKDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11806    1 EYVAIADFVATDDSQLSFESGDKLLVlRKPSVDWWWAEHNGCCGYIPASHL 51

TolA protein; TolA couples the inner membrane complex of itself with TolQ and TolR to the outer membrane complex of TolB and OprL (also called Pal). Most of the length of the protein consists of low-complexity sequence that may differ in both length and composition from one species to another, complicating efforts to discriminate TolA (the most divergent gene in the tol-pal system) from paralogs such as TonB. Selection of members of the seed alignment and criteria for setting scoring cutoffs are based largely conserved operon struction. //The Tol-Pal complex is required for maintaining outer membrane integrity. Also involved in transport (uptake) of colicins and filamentous DNA, and implicated in pathogenesis. Transport is energized by the proton motive force. TolA is an inner membrane protein that interacts with periplasmic TolB and with outer membrane porins ompC, phoE and lamB. [Transport and binding proteins, Other, Cellular processes, Pathogenesis]

Pssm-ID: 274303 [Multi-domain] Cd Length: 346 Bit Score: 43.30 E-value: 1.20e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    336 EDEQQQLEKKLPvtfEDKKRENFERgnlELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKqlek 415
Cdd:TIGR02794   63 AKKEQERQKKLE---QQAEEAEKQR---AAEQARQKELEQRAAAEKAAKQAEQAAKQAEEKQKQAEEAKAKQAAEA---- 132

                           90       100       110       120       130       140       150
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 47717123    416 qrelerqreeerrkeierreAAKRELERQRQLEWERNRRQElLNQRNKEQEDivvlkAKKKTLEFELEALNDKK 489
Cdd:TIGR02794  133 --------------------KAKAEAEAERKAKEEAAKQAE-EEAKAKAAAE-----AKKKAEEAKKKAEAEAK 180

Leukemia-associated Rho guanine nucleotide exchange factor Pleckstrin homology (PH) domain; LARG (also called RhoGEF12) belongs to regulator of G-protein signaling (RGS) domain-containing RhoGEFs that are RhoA-selective and directly activated by the Galpha12/13 family of heterotrimeric G proteins. RhoGEFs activate Rho GTPases regulating cytoskeletal structure, gene transcription, and cell migration. LARG contains a N-terminal extension, followed by Dbl homology (DH)-PH domains which bind and catalyze the exchange of GDP for GTP on RhoA in addition to a RGS domain. The active site of RhoA adopts two distinct GDP-excluding conformations among the four unique complexes in the asymmetric unit. The LARG PH domain also contains a potential protein-docking site. LARG forms a homotetramer via its DH domains. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 275425 Cd Length: 138 Bit Score: 40.74 E-value: 1.22e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1458 LGPRKFLHSGKL-YKAKSNK--ELYGFLFNDFLLLTQ----------ITKPLGSSGTDK-VFSPKsnlqykmyktpIFLN 1523
Cdd:cd13390   21 LTKRKMIHEGPLtWKVNRDKtiDLYTLLLEDILVLLQkqddrlvlrcHSKILASTADSKhTFSPV-----------IKLN 89

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|...
gi 47717123 1524 EVLVK-LPTDpsgDEPIFHISHID---RVYTLRAESINERTAW 1562
Cdd:cd13390   90 TVLVRqVATD---NKAFFVISMSEngaQIYELVAQTVSEKTVW 129

Protein of unknown function (DUF3584); This protein is found in bacteria and eukaryotes. Proteins in this family are typically between 943 to 1234 amino acids in length. This family contains a P-loop motif suggesting it is a nucleotide binding protein. It may be involved in replication.

Pssm-ID: 432349 [Multi-domain] Cd Length: 1191 Bit Score: 43.67 E-value: 1.26e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEKKL--------PVTFEDKKRENFERGNLELEKRRQALlEQQRKEQERLAQLERA---------EQERKERE 397
Cdd:pfam12128  435 FNEEEYRLKSRLgelklrlnQATATPELLLQLENFDERIERAREEQ-EAANAEVERLQSELRQarkrrdqasEALRQASR 513

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    398 RQEQERKRQLELEKQLEKQRELERQREEERRKEIERREA--AKRELERQRQLEWERNRRQEllnqrnKEQEDIVVLKAKK 475
Cdd:pfam12128  514 RLEERQSALDELELQLFPQAGTLLHFLRKEAPDWEQSIGkvISPELLHRTDLDPEVWDGSV------GGELNLYGVKLDL 587

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    476 KTLE-----FELEALNDKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQilND 550
Cdd:pfam12128  588 KRIDvpewaASEEELRERLDKAEEALQSAREKQAAAEEQLVQANGELEKASREETFARTALKNARLDLRRLFDEKQ--SE 665

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    551 QLKQVQQNSLHRDSLVTLKRALEAK--------ELARQHLRDQLDEVEKETRSKLQE-IDIFNNQLKELreihnKQQLQK 621
Cdd:pfam12128  666 KDKKNKALAERKDSANERLNSLEAQlkqldkkhQAWLEEQKEQKREARTEKQAYWQVvEGALDAQLALL-----KAAIAA 740

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    622 QKSMEAERLKQKEQERK-------------------IIELEKQKEEAQRRAQE--RDKQWLEHVQQEdehQRPRKLHEEE 680
Cdd:pfam12128  741 RRSGAKAELKALETWYKrdlaslgvdpdviaklkreIRTLERKIERIAVRRQEvlRYFDWYQETWLQ---RRPRLATQLS 817

                          410       420
                   ....*....|....*....|....*...
gi 47717123    681 KLKREESvkkkdgeekgkqEAQDKLGRL 708
Cdd:pfam12128  818 NIERAIS------------ELQQQLARL 833

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 38.42 E-value: 1.29e-03

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwvDESqtgepGWLGGEL-----KGKTGWFPANY 800
Cdd:cd11883    3 VALYDFTPKSKNQLSFKAGDIIYVLNK--DPS-----GWWDGVIisssgKVKRGWFPSNY 55

C-terminal Src Homology 3 domain of Ct10 Regulator of Kinase adaptor proteins; CRK adaptor proteins consists of SH2 and SH3 domains, which bind tyrosine-phosphorylated peptides and proline-rich motifs, respectively. They function downstream of protein tyrosine kinases in many signaling pathways started by various extracellular signals, including growth and differentiation factors. Cellular CRK (c-CRK) contains a single SH2 domain, followed by N-terminal and C-terminal SH3 domains. It is involved in the regulation of many cellular processes including cell growth, motility, adhesion, and apoptosis. CRK has been implicated in the malignancy of various human cancers. The C-terminal SH3 domain of CRK has not been shown to bind any target protein; it acts as a negative regulator of CRK function by stabilizing a structure that inhibits the access by target proteins to the N-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212693 [Multi-domain] Cd Length: 57 Bit Score: 38.62 E-value: 1.30e-03

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1153 ALAAVCQ--VIGMYDYTAqnddeLAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd11759    2 AYARVIQkrVPNAYDKTA-----LALEVGDLVKVTKINVSGQWEGELNGKVGHFPFTHVEL 57

Second Src Homology 3 domain of FCH and double SH3 domains protein 2; FCHSD2 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212827 Cd Length: 56 Bit Score: 38.38 E-value: 1.33e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILV----TKKDGDWWTGTVGDKAGVFPS 1052
Cdd:cd11894    4 ALYDYEGQTDDELSFPEGAIIRIlnkeNQDDDGFWEGEFNGRIGVFPS 51

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 38.45 E-value: 1.33e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1084 SYTATGPEQLTLAPGQLILIRKKNPG--GWWEGELQARgkkrqIGWFPANYVK 1134
Cdd:cd11977    8 NFAARDMRELSLREGDVVRIYSRIGGdqGWWKGETNGR-----IGWFPSTYVE 55

C2 domain of Perforin; Perforin contains a single copy of a C2 domain in its C-terminus and plays a role in lymphocyte-mediated cytotoxicity. Mutations in perforin leads to familial hemophagocytic lymphohistiocytosis type 2. The function of perforin is calcium dependent and the C2 domain is thought to confer this binding to target cell membranes. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 175998 [Multi-domain] Cd Length: 127 Bit Score: 40.32 E-value: 1.35e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1594 GIGRLMVNVVegielkpcRSHG-------KSNPYCEVTMGSQCHITKTIQDTLNPKWNSNCQFFIRDLEQ-EVLCITVFE 1665
Cdd:cd04032   26 GLATLTVTVL--------RATGlwgdyftSTDGYVKVFFGGQEKRTEVIWNNNNPRWNATFDFGSVELSPgGKLRFEVWD 97

                         90       100
                 ....*....|....*....|....*
gi 47717123 1666 RDQFSPDDFLGRTEIRV-ADIKKDQ 1689
Cdd:cd04032   98 RDNGWDDDLLGTCSVVPeAGVHEDS 122

EF-hand domain pair;

Pssm-ID: 463900 [Multi-domain] Cd Length: 67 Bit Score: 38.77 E-value: 1.36e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 47717123    224 KYRQLFNSHDKTMSGHLT----GPQARTILMQSSLPQAQLASIWNLSDIDQDGKLTAEEFILAM 283
Cdd:pfam13499    3 KLKEAFKLLDSDGDGYLDveelKKLLRKLEEGEPLSDEEVEELFKEFDLDKDGRISFEEFLELY 66

Src homology 3 domain of Src kinase-like Protein Tyrosine Kinases; Src subfamily members include Src, Lck, Hck, Blk, Lyn, Fgr, Fyn, Yrk, Yes, and Brk. Src (or c-Src) proteins are cytoplasmic (or non-receptor) PTKs which are anchored to the plasma membrane. They contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation sites. Src proteins are involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. They were identified as the first proto-oncogene products, and they regulate cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Src kinases are overexpressed in a variety of human cancers, making them attractive targets for therapy. They are also implicated in acute inflammatory responses and osteoclast function. Src, Fyn, Yes, and Yrk are widely expressed, while Blk, Lck, Hck, Fgr, Lyn, and Brk show a limited expression pattern. This subfamily also includes Drosophila Src42A, Src oncogene at 42A (also known as Dsrc41) which accumulates at sites of cell-cell or cell-matrix adhesion, and participates in Drosphila development and wound healing. It has been shown to promote tube elongation in the tracheal system, is essential for proper cell-cell matching during dorsal closure, and regulates cell-cell contacts in developing Drosophila eyes. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212779 [Multi-domain] Cd Length: 52 Bit Score: 38.33 E-value: 1.37e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGE--VQGQKGWFPKSY 965
Cdd:cd11845    4 ALYDYEARTDDDLSFKKGDRLQILDDsDGDWWLARhlSTGKEGYIPSNY 52

C2 domain second repeat present in Synaptotagmin 1; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Synaptotagmin 1, a member of the class 1 synaptotagmins, is located in the brain and endocranium and localized to the synaptic vesicles and secretory granules. It functions as a Ca2+ sensor for fast exocytosis. It, like synaptotagmin-2, has an N-glycosylated N-terminus. Synaptotagmin 4, a member of class 4 synaptotagmins, is located in the brain. It functions are unknown. It, like synaptotagmin-11, has an Asp to Ser substitution in its C2A domain. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 176047 [Multi-domain] Cd Length: 136 Bit Score: 40.46 E-value: 1.44e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTM---GSQCHITKTI--QDTLNPKWNSNCQFFI--RDLEQEVLCITVFERDQ 1668
Cdd:cd08402   15 GKLTVVILEAKNLKKMDVGGLSDPYVKIHLmqnGKRLKKKKTTikKRTLNPYYNESFSFEVpfEQIQKVHLIVTVLDYDR 94


                 ....*....
gi 47717123 1669 FSPDDFLGR 1677
Cdd:cd08402   95 IGKNDPIGK 103

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 2; ASAP2 is also called DDEF2 (Development and Differentiation Enhancing Factor 2), AMAP2, centaurin beta-3, or PAG3. It mediates the functions of Arf GTPases vial dual mechanisms: it exhibits GTPase activating protein (GAP) activity towards class I (Arf1) and II (Arf5) Arfs; and it binds class III Arfs (GTP-Arf6) stably without GAP activity. It binds paxillin and is implicated in Fcgamma receptor-mediated phagocytosis in macrophages and in cell migration. ASAP2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212899 Cd Length: 56 Bit Score: 38.40 E-value: 1.48e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQ---KGWFPKSYV 966
Cdd:cd11966    1 RVKALYNCVADNPDELTFSEGEIIIVDGEEDKeWWIGHIDGEptrRGAFPVSFV 54

Myosin tail; The myosin molecule is a multi-subunit complex made up of two heavy chains and four light chains it is a fundamental contractile protein found in all eukaryote cell types. This family consists of the coiled-coil myosin heavy chain tail region. The coiled-coil is composed of the tail from two molecules of myosin. These can then assemble into the macromolecular thick filament. The coiled-coil region provides the structural backbone the thick filament.

Pssm-ID: 460256 [Multi-domain] Cd Length: 1081 Bit Score: 43.63 E-value: 1.50e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEKKLPVtfEDKKRENFERgnlELEKRRQALLEQQRKEQERLAQLERAEQERKERERqEQERKRQlelekqle 414
Cdd:pfam01576  494 LEDERNSLQEQLEE--EEEAKRNVER---QLSTLQAQLSDMKKKLEEDAGTLEALEEGKKRLQR-ELEALTQ-------- 559

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    415 kqrelerqReeerrkeIERREAAKRELERQrqleweRNRRQEllnqrnkEQEDIVVLKAKKKTLEFELEALNDKKHQLEG 494
Cdd:pfam01576  560 --------Q-------LEEKAAAYDKLEKT------KNRLQQ-------ELDDLLVDLDHQRQLVSNLEKKQKKFDQMLA 611

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    495 KLQDIRCRLTTQRQEIESTNKSRELRIAEITHLqqqlqesqqmlgrLIPEKQILNDQLKQVQQNSLHRDSLVT------- 567
Cdd:pfam01576  612 EEKAISARYAEERDRAEAEAREKETRALSLARA-------------LEEALEAKEELERTNKQLRAEMEDLVSskddvgk 678

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    568 ----LKRALEAKELARQHLRDQLDEVEKETR----SKLQ-EIDIFNNQLKELREIHN--------KQQLQKQ-KSMEAER 629
Cdd:pfam01576  679 nvheLERSKRALEQQVEEMKTQLEELEDELQatedAKLRlEVNMQALKAQFERDLQArdeqgeekRRQLVKQvRELEAEL 758

                          330       340       350       360       370       380
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123    630 LKQKEQ-----------ERKIIELEKQKEEAQRRAQERDKQwLEHVQ-QEDEHQRPRklhEEEKLKREE 686
Cdd:pfam01576  759 EDERKQraqavaakkklELDLKELEAQIDAANKGREEAVKQ-LKKLQaQMKDLQREL---EEARASRDE 823

Second Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the second SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213010 Cd Length: 54 Bit Score: 38.47 E-value: 1.50e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELKGKTGWFPANYAEK 803
Cdd:cd12077    3 YVTVQPYTSQGKDEIGFEKGVTVEV-------IQKNLEGWWYIRYLGKEGWAPASYLKK 54

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 38.43 E-value: 1.53e-03

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  746 RALYPFESRSHDEITiqpgdivMVKGEWVDESQTGEPGWLGGELKGKTG-WFPANYAEKI 804
Cdd:cd11970    7 KALFDYKAQREDELT-------FTKNAIIQNVEKQEGGWWRGDYGGKKQlWFPSNYVEEI 59

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 38.45 E-value: 1.53e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1082 IASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQArgkkrQIGWFPANYVKLLS 1137
Cdd:cd11972    8 IYDYTKDKEDELSFQEGAIIYVIKKNDDGWYEGVMNG-----VTGLFPGNYVESIM 58

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 38.42 E-value: 1.55e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVkgewVDESqtgEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11996    5 AMYDYTANNEDELSFSKGQLINV----LNKD---DPDWWQGEINGVTGLFPSNYVK 53

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 38.46 E-value: 1.57e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1085 YTATGPEQLTLAPGQLILIRKKNPGGWWEGElqargKKRQIGWFPANYV 1133
Cdd:cd11963   10 FEAVEDNELTFKHGEIIIVLDDSDANWWKGE-----NHRGVGLFPSNFV 53

Src homology 3 domain of Type I fungal Myosins; Type I myosins (myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Saccharomyces cerevisiae has two myosins-I, Myo3 and Myo5, which are involved in endocytosis and the polarization of the actin cytoskeleton. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212792 [Multi-domain] Cd Length: 55 Bit Score: 38.14 E-value: 1.58e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGD--KAGVFPSNYV 1055
Cdd:cd11858    2 YKALYDFAGSVANELSLKKDDIVYIVQKEDNgWWLAKKLDesKEGWVPAAYL 53

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 1 (PACSIN1) and PACSIN 2; PACSIN 1 or Syndapin I (Synaptic dynamin-associated protein I) is expressed specifically in the brain and is localized in neurites and synaptic boutons. It binds the brain-specific proteins dynamin I, synaptojanin, synapsin I, and neural Wiskott-Aldrich syndrome protein (nWASP), and functions as a link between the cytoskeletal machinery and synaptic vesicle endocytosis. PACSIN 1 interacts with huntingtin and may be implicated in the neuropathology of Huntington's disease. PACSIN 2 or Syndapin II is expressed ubiquitously and is involved in the regulation of tubulin polymerization. It associates with Golgi membranes and forms a complex with dynamin II which is crucial in promoting vesicle formation from the trans-Golgi network. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212931 [Multi-domain] Cd Length: 56 Bit Score: 38.39 E-value: 1.61e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKDGD--WWTGTV-GDKAGVFPSNYV 1055
Cdd:cd11998    5 ALYDYDGQEQDELSFKAGDELTKLEDEDEqgWCKGRLdSGQVGLYPANYV 54

Second Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212749 [Multi-domain] Cd Length: 52 Bit Score: 37.93 E-value: 1.66e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQKGWFPKSYVK 967
Cdd:cd11815    1 HAVVLHDFPAEHSDDLSLNSGEIVYLLEKIDTEWYrGKCKNTTGIFPANHVK 52

Src homology 3 domain of RUN and SH3 domain-containing protein 2; RUSC2, also called Iporin or Interacting protein of Rab1, is expressed ubiquitously with highest amounts in the brain and testis. It interacts with the small GTPase Rab1 and the Golgi matrix protein GM130, and may function in linking GTPases to certain intracellular signaling pathways. RUSC proteins are adaptor proteins consisting of RUN, leucine zipper, and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212890 Cd Length: 52 Bit Score: 37.97 E-value: 1.67e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1159 QVIGMYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11957    1 EVKALCHHIATEPGQLSFNKGDILQVLSRADGDWLRCSLGPDSGLVPIAYV 51

Uncharacterized conserved protein YhaN, contains AAA domain [Function unknown];

Pssm-ID: 443752 [Multi-domain] Cd Length: 641 Bit Score: 43.22 E-value: 1.69e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  545 KQILNDQLKQVQQNslhRDSLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKS 624
Cdd:COG4717   66 PELNLKELKELEEE---LKEAEEKEEEYAELQEELEELEEELEELEAELEELREELEKLEKLLQLLPLYQELEALEAELA 142

                         90       100       110       120       130       140
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  625 MEAERLKQ-KEQERKIIELEKQKEEAQRRAQERDkqwlehvQQEDEHQRPRKLHEEEKLKR 684
Cdd:COG4717  143 ELPERLEElEERLEELRELEEELEELEAELAELQ-------EELEELLEQLSLATEEELQD 196

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53, Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2 (BAIAP2)-Like proteins, and similar proteins; Proteins in this family include IRSp53, BAIAP2L1, BAIAP2L2, and similar proteins. They all contain an Inverse-Bin/Amphiphysin/Rvs (I-BAR) or IMD domain in addition to the SH3 domain. IRSp53, also known as BAIAP2, is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. BAIAP2L1, also called IRTKS (Insulin Receptor Tyrosine Kinase Substrate), serves as a substrate for the insulin receptor and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. IRSp53 and IRTKS also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. The SH3 domains of IRSp53 and IRTKS have been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212713 [Multi-domain] Cd Length: 57 Bit Score: 38.07 E-value: 1.72e-03

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwvdesqtgEP--GWLGGEL--KGKTGWFPANYAEK 803
Cdd:cd11779    4 KALYPHAAGGETQLSFEEGDVITLLGP--------EPrdGWHYGENerSGRRGWFPIAYTEP 57

Second C-terminal Src homology 3 domain of Rho guanine nucleotide exchange factor 37; ARHGEF37 contains a RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. Its specific function is unknown. Its domain architecture is similar to the C-terminal half of DNMBP or Tuba, a cdc42-specific GEF that provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics, and plays an important role in regulating cell junction configuration. GEFs activate small GTPases by exchanging bound GDP for free GTP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212874 Cd Length: 57 Bit Score: 38.35 E-value: 1.73e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-----WWFGEVQGQKGWFPKSYV 966
Cdd:cd11941    1 QVVAAYPFTARSKHEVSLQAGQPVTVLEPHDKkgspeWSLVEVNGQRGYVPSSYL 55

First Src Homology 3 domain of SH3 domain containing ring finger protein 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212860 Cd Length: 54 Bit Score: 38.01 E-value: 1.75e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwVDESqtgepgWLGGELKGKTGWFPANYAE 802
Cdd:cd11927    4 KALYNYEGKEPGDLKFSKGDIIILRRQ-VDEN------WYHGEVNGIHGFFPTNFVQ 53

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 38.06 E-value: 1.76e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwvdesqtGEPGWLGGELKGK---TGWFPANY 800
Cdd:cd11821    3 RALYDCQADNDDELTFSEGEIIVVTGE-------EDDEWWEGHIEGDpsrRGVFPVSF 53

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 38.06 E-value: 1.80e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1011 YTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11902    7 FAYVAEREDELSLVKGSRVTVMEKCSDgWWRGSYNGQIGWFPSNYV 52

Src homology 3 domain of SH3 and multiple ankyrin repeat domains (Shank) proteins; Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. They bind a variety of membrane and cytosolic proteins, and exist in alternatively spliced isoforms. They are highly enriched in postsynaptic density (PSD) where they interact with the cytoskeleton and with postsynaptic membrane receptors including NMDA and glutamate receptors. They are crucial in the construction and organization of the PSD and dendritic spines of excitatory synapses. There are three members of this family (Shank1, Shank2, Shank3) which show distinct and cell-type specific patterns of expression. Shank1 is brain-specific; Shank2 is found in neurons, glia, endocrine cells, liver, and kidney; Shank3 is widely expressed. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212766 Cd Length: 50 Bit Score: 37.80 E-value: 1.83e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKGewvdesqTGEPGWLGGELKGKTGWFPA 798
Cdd:cd11832    1 YFIAVKSYSPQEEGEISLHKGDRVKVLS-------IGEGGFWEGSVRGRTGWFPS 48

Second Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212856 [Multi-domain] Cd Length: 57 Bit Score: 37.97 E-value: 1.84e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1006 EFIAMYTYESSEQGDLTFQQGD-VILVTKKDGDWWTGTV--GDKAGVFPSNYVRL 1057
Cdd:cd11923    2 EAVAKYNFNADTNVELSLRKGDrVVLLKQVDQNWYEGKIpgTNRQGIFPVSYVEV 56

First Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212695 [Multi-domain] Cd Length: 57 Bit Score: 38.11 E-value: 1.85e-03

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1076 PEIAQVIASYTATGPEQLTLAPGQLI-LIRKKNPGGWwegeLQARGKKRQIGWFPANYVKL 1135
Cdd:cd11761    1 PVTCKVLYSYEAQRPDELTITEGEELeVIEDGDGDGW----VKARNKSGEVGYVPENYLQF 57

Second Src Homology 3 domain (SH3B) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CIN85. SH3B has been shown to bind Cbl proline-rich peptides and ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212988 [Multi-domain] Cd Length: 53 Bit Score: 38.05 E-value: 1.88e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1080 QVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARgkkrqIGWFPANYVK 1134
Cdd:cd12055    3 QVAFSYLPQNEDELELKVGDIIEVVGEVEEGWWEGVLNGK-----TGMFPSNFIK 52

Src Homology 3 domain of Nephrocystin (or Nephrocystin-1); Nephrocystin contains an SH3 domain involved in signaling pathways that regulate cell adhesion and cytoskeletal organization. It is a protein that in humans is associated with juvenile nephronophthisis, an inherited kidney disease characterized by renal fibrosis that lead to chronic renal failure in children. It is localized in cell-cell junctions in renal duct cells, and is known to interact with Ack1, an activated Cdc42-associated kinase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212704 [Multi-domain] Cd Length: 54 Bit Score: 38.06 E-value: 1.94e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1081 VIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGElQARGKKrqiGWFPANYVKL 1135
Cdd:cd11770    4 ALSDFQAEQEGDLSFKKGEVLRIISKRADGWWLAE-NSKGNR---GLVPKTYLKV 54

Third Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212718 Cd Length: 55 Bit Score: 37.83 E-value: 1.97e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTKKDGDWW---TGTVGDKAGVFPSNYV 1055
Cdd:cd11784    2 CVALHSYSAHRPEELELQKGEGVRVLGKFQEGWlrgLSLVTGRVGIFPSNYV 53

Third Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. The third SH3 domain of Sla1p can bind ubiquitin while retaining the ability to bind proline-rich ligands; monoubiquitination of target proteins signals internalization and sorting through the endocytic pathway. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212709 [Multi-domain] Cd Length: 57 Bit Score: 38.07 E-value: 2.00e-03

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1077 EIAQVIASYTATGPEQLTLAPGQ-LILIRKKNPGGWWEGELQARGKKrqiGWFPANYVKL 1135
Cdd:cd11775    1 KRGKVLYDFDAQSDDELTVKEGDvVYILDDKKSKDWWMVENVSTGKE---GVVPASYIEI 57

Src Homology 3 domain of Amphiphysin and related domains; Amphiphysins function primarily in endocytosis and other membrane remodeling events. They exist in several isoforms and mammals possess two amphiphysin proteins from distinct genes. Amphiphysin I proteins, enriched in the brain and nervous system, contain domains that bind clathrin, Adaptor Protein complex 2 (AP2), dynamin, and synaptojanin. They function in synaptic vesicle endocytosis. Human autoantibodies to amphiphysin I hinder GABAergic signaling and contribute to the pathogenesis of paraneoplastic stiff-person syndrome. Some amphiphysin II isoforms, also called Bridging integrator 1 (Bin1), are localized in many different tissues and may function in intracellular vesicle trafficking. In skeletal muscle, Bin1 plays a role in the organization and maintenance of the T-tubule network. Mutations in Bin1 are associated with autosomal recessive centronuclear myopathy. Amphiphysins contain an N-terminal BAR domain with an additional N-terminal amphipathic helix (an N-BAR), a variable central domain, and a C-terminal SH3 domain. The SH3 domain of amphiphysins bind proline-rich motifs present in binding partners such as dynamin, synaptojanin, and nsP3. It also belongs to a subset of SH3 domains that bind ubiquitin in a site that overlaps with the peptide binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212724 [Multi-domain] Cd Length: 64 Bit Score: 38.08 E-value: 2.02e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVT------KKDGDWWTGTVGD--KAGVFPSNYVR 1056
Cdd:cd11790    7 ATHDYTAEDTDELTFEKGDVILVIpfddpeEQDEGWLMGVKEStgCRGVFPENFTE 62

Src Homology 3 domain of Myosin XVb; Myosin XVb, also called KIAA1783, was named based on its similarity with myosin XVa. It is a transcribed and unprocessed pseudogene whose predicted amino acid sequence contains mutated or deleted amino acid residues that are normally conserved and important for myosin function. The related myosin XVa is important for normal growth of mechanosensory stereocilia of inner ear hair cells. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 213001 Cd Length: 55 Bit Score: 37.93 E-value: 2.05e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNKE--DPDWWKGEVNGQVGLFPSNYVKL 1211
Cdd:cd12068    2 VVALRSYITDDKSLLSFHRGDLIKLLPMAglEPGWQFGSTGGRSGLFPADIVQP 55

Second Src Homology 3 domain of FCH and double SH3 domains protein 2; FCHSD2 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212827 Cd Length: 56 Bit Score: 38.00 E-value: 2.05e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  744 YYRALYPFESRSHDEITIQPGDIVMVKGEwvdESQTGEPGWlGGELKGKTGWFPANYAE 802
Cdd:cd11894    1 FVKALYDYEGQTDDELSFPEGAIIRILNK---ENQDDDGFW-EGEFNGRIGVFPSVLVE 55

Second Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the second SH3 domain, located C-terminal of the first SH3 domain at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212864 Cd Length: 55 Bit Score: 37.98 E-value: 2.07e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1162 GMYDYTAQNDDE----LAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd11931    4 ALYDFEIKDKDQdkdcLTFTKDEILTVIRRVDENWAEGMLGDKIGIFPILYV 55

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 37.73 E-value: 2.11e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVKgewvdESQtgEPGWLGGELKGKTGWFPANY 800
Cdd:cd11837    2 ATALYPWRAKKENHLSFAKGDIITVL-----EQQ--EMWWFGELEGGEEGWFPKSY 50

rad50; All proteins in this family for which functions are known are involvedin recombination, recombinational repair, and/or non-homologous end joining.They are components of an exonuclease complex with MRE11 homologs. This family is distantly related to the SbcC family of bacterial proteins.This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University).

Pssm-ID: 129694 [Multi-domain] Cd Length: 1311 Bit Score: 43.11 E-value: 2.13e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEKKLPVTFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERE--------RQEQERKRQ 406
Cdd:TIGR00606  476 LDQELRKAERELSKAEKNSLTETLKKEVKSLQNEKADLDRKLRKLDQEMEQLNHHTTTRTQMEmltkdkmdKDEQIRKIK 555

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    407 LELEKQLEKQRELERQREEERRKEIERREAAKRELERQRQLEWERNRRQELLNQRNKEQedivvlkakkKTLEFELEALN 486
Cdd:TIGR00606  556 SRHSDELTSLLGYFPNKKQLEDWLHSKSKEINQTRDRLAKLNKELASLEQNKNHINNEL----------ESKEEQLSSYE 625

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    487 DKKHQLEGKlQDIRCRLTTQRQEIESTNKSRELRIAE-------ITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNS 559
Cdd:TIGR00606  626 DKLFDVCGS-QDEESDLERLKEEIEKSSKQRAMLAGAtavysqfITQLTDENQSCCPVCQRVFQTEAELQEFISDLQSKL 704

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    560 -LHRDSLVTLKRALEAKELARQHL-------RDQLDEVEK---ETRSKLQEIdifNNQLKELREIHNKQQLQKQKSMEAE 628
Cdd:TIGR00606  705 rLAPDKLKSTESELKKKEKRRDEMlglapgrQSIIDLKEKeipELRNKLQKV---NRDIQRLKNDIEEQETLLGTIMPEE 781

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    629 RLKQKEQ------ERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKL--KREESVKKKDGEEKGKQE 700
Cdd:TIGR00606  782 ESAKVCLtdvtimERFQMELKDVERKIAQQAAKLQGSDLDRTVQQVNQEKQEKQHELDTVvsKIELNRKLIQDQQEQIQH 861


                   ....*...
gi 47717123    701 AQDKLGRL 708
Cdd:TIGR00606  862 LKSKTNEL 869

Src homology 3 domain of Abl Interactor 1; Abi1, also called e3B1, is a central regulator of actin cytoskeletal reorganization through interactions with many protein complexes. It is part of WAVE, a nucleation-promoting factor complex, that links Rac 1 activation to actin polymerization causing lamellipodia protrusion at the plasma membrane. Abi1 interact with formins to promote protrusions at the leading edge of motile cells. It also is a target of alpha4 integrin, regulating membrane protrusions at sites of integrin engagement. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212904 [Multi-domain] Cd Length: 59 Bit Score: 38.08 E-value: 2.18e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1082 IASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQargkkRQIGWFPANYVK 1134
Cdd:cd11971    5 IYDYSKDKDDELSFMEGAIIYVIKKNDDGWYEGVCN-----GVTGLFPGNYVE 52

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 37.75 E-value: 2.22e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1085 YTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARgkkrqIGWFPANYVKL 1135
Cdd:cd11828    8 HVTMDPEELGFKAGDVIEVLDMSDKDWWWGSIRDE-----EGWFPASFVRL 53

Ca2+-binding protein, EF-hand superfamily [Signal transduction mechanisms];

Pssm-ID: 444056 [Multi-domain] Cd Length: 137 Bit Score: 40.16 E-value: 2.23e-03

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|...
gi 47717123  212 VAEWAVPQSSRLKYRQLFNSHDKTMSGHLTGPQARTILMQSSLPQAQLASIWNLSDIDQDGKLTAEEFILAMH 284
Cdd:COG5126   58 GMESLFEATVEPFARAAFDLLDTDGDGKISADEFRRLLTALGVSEEEADELFARLDTDGDGKISFEEFVAAVR 130

C-terminal Src Homology 3 domain of Nebulin; Nebulin is a giant filamentous protein (600-900 kD) that is expressed abundantly in skeletal muscle. It binds to actin thin filaments and regulates its assembly and function. Nebulin was thought to be part of a molecular ruler complex that is critical in determining the lengths of actin thin filaments in skeletal muscle since its length, which varies due to alternative splicing, correlates with the length of thin filaments in various muscle types. Recent studies indicate that nebulin regulates thin filament length by stabilizing the filaments and preventing depolymerization. Mutations in nebulin can cause nemaline myopathy, characterized by muscle weakness which can be severe and can lead to neonatal lethality. Nebulin contains an N-terminal LIM domain, many nebulin repeats/super repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212866 [Multi-domain] Cd Length: 58 Bit Score: 38.06 E-value: 2.30e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  915 GLQAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQ--GQKGWFPKSYVKLI 969
Cdd:cd11933    1 GKSFRAMYDYRAADDDEVSFKDGDTIVNVQTIDEgWMYGTVQrtGKTGMLPANYVEAI 58

Uncharacterized conserved protein YhaN, contains AAA domain [Function unknown];

Pssm-ID: 443752 [Multi-domain] Cd Length: 641 Bit Score: 42.83 E-value: 2.31e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  295 LPPVLPPEYIPPSFRRVRSGSGISVISSTSVDQRLPEEpvLEDEQQQLEKKLPVTFEDKKRENFERGN--LELEKRRQAL 372
Cdd:COG4717  330 LPPDLSPEELLELLDRIEELQELLREAEELEEELQLEE--LEQEIAALLAEAGVEDEEELRAALEQAEeyQELKEELEEL 407

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  373 LEQ-QRKEQERLAQLERAEQERKERERQEQERKRQlELEKQLEKQRELERQREeerrkeierreAAKRELERQRQLEWER 451
Cdd:COG4717  408 EEQlEELLGELEELLEALDEEELEEELEELEEELE-ELEEELEELREELAELE-----------AELEQLEEDGELAELL 475

                        170       180       190       200       210
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  452 NRRQELLNQRNKEQEDIVVLKAKKKTLEFELEAL-NDKKHQLEGKLQDIRCRLT 504
Cdd:COG4717  476 QELEELKAELRELAEEWAALKLALELLEEAREEYrEERLPPVLERASEYFSRLT 529

Src Homology 3 domain of Amphiphysin and related domains; Amphiphysins function primarily in endocytosis and other membrane remodeling events. They exist in several isoforms and mammals possess two amphiphysin proteins from distinct genes. Amphiphysin I proteins, enriched in the brain and nervous system, contain domains that bind clathrin, Adaptor Protein complex 2 (AP2), dynamin, and synaptojanin. They function in synaptic vesicle endocytosis. Human autoantibodies to amphiphysin I hinder GABAergic signaling and contribute to the pathogenesis of paraneoplastic stiff-person syndrome. Some amphiphysin II isoforms, also called Bridging integrator 1 (Bin1), are localized in many different tissues and may function in intracellular vesicle trafficking. In skeletal muscle, Bin1 plays a role in the organization and maintenance of the T-tubule network. Mutations in Bin1 are associated with autosomal recessive centronuclear myopathy. Amphiphysins contain an N-terminal BAR domain with an additional N-terminal amphipathic helix (an N-BAR), a variable central domain, and a C-terminal SH3 domain. The SH3 domain of amphiphysins bind proline-rich motifs present in binding partners such as dynamin, synaptojanin, and nsP3. It also belongs to a subset of SH3 domains that bind ubiquitin in a site that overlaps with the peptide binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212724 [Multi-domain] Cd Length: 64 Bit Score: 38.08 E-value: 2.32e-03

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVL------EQQDMWWFG--EVQGQKGWFPKSYVKLI 969
Cdd:cd11790    5 VRATHDYTAEDTDELTFEKGDVILVIpfddpeEQDEGWLMGvkESTGCRGVFPENFTERI 64

Outer membrane protein (OmpH-like); This family includes outer membrane proteins such as OmpH among others. Skp (OmpH) has been characterized as a molecular chaperone that interacts with unfolded proteins as they emerge in the periplasm from the Sec translocation machinery.

Pssm-ID: 214922 [Multi-domain] Cd Length: 140 Bit Score: 39.87 E-value: 2.50e-03

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123     335 LEDEQQQLEKKLpvtfeDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKQLE 414
Cdd:smart00935   23 LEKEFKKRQAEL-----EKLEKELQKLKEKLQKDAATLSEAAREKKEKELQKKVQEFQRKQQKLQQDLQKRQQEELQKIL 97


                    ..
gi 47717123     415 KQ 416
Cdd:smart00935   98 DK 99

EF-hand, calcium binding motif; A diverse superfamily of calcium sensors and calcium signal modulators; most examples in this alignment model have 2 active canonical EF hands. Ca2+ binding induces a conformational change in the EF-hand motif, leading to the activation or inactivation of target proteins. EF-hands tend to occur in pairs or higher copy numbers.

Pssm-ID: 238008 [Multi-domain] Cd Length: 63 Bit Score: 37.91 E-value: 2.51e-03

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|...
gi 47717123  224 KYRQLFNSHDKTMSGHLTGPQARTIL--MQSSLPQAQLASIWNLSDIDQDGKLTAEEFILAMH 284
Cdd:cd00051    1 ELREAFRLFDKDGDGTISADELKAALksLGEGLSEEEIDEMIREVDKDGDGKIDFEEFLELMA 63

Third Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the third SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212950 Cd Length: 53 Bit Score: 37.43 E-value: 2.54e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*
gi 47717123 1165 DYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYV 1209
Cdd:cd12017    7 EFQATIQDGISFQKGQKVEVIDKNPSGWWYVKIDGKEGWAPSSYI 51

Apg6 coiled-coil region; In yeast, 15 Apg proteins coordinate the formation of autophagosomes. Autophagy is a bulk degradation process induced by starvation in eukaryotic cells. Apg6/Vps30p has two distinct functions in the autophagic process, either associated with the membrane or in a retrieval step of the carboxypeptidase Y sorting pathway.

Pssm-ID: 465452 [Multi-domain] Cd Length: 127 Bit Score: 39.50 E-value: 2.56e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    576 ELARQHLRDQLDEVEKetrsklqEIDIFNNQLKELREIHNKQQLQKQKsmEAERLKQKEQE--RKIIELEKQKE--EAQR 651
Cdd:pfam17675    8 DLLLEELDKQLEDAEK-------ERDAYISFLKKLEKETPEELEELEK--ELEKLEKEEEEllQELEELEKEREelDAEL 78

                           90       100       110
                   ....*....|....*....|....*....|....*
gi 47717123    652 RAQERDKQWLEhvQQEDEHQRPRKLHEEEKLKREE 686
Cdd:pfam17675   79 EALEEELEALD--EEEEEFWREYNALQLQLLEFQD 111

Third Src homology 3 domain of Rab3-interacting molecules (RIMs) binding proteins; RIMs binding proteins (RBPs, RIM-BPs) associate with calcium channels present in photoreceptors, neurons, and hair cells; they interact simultaneously with specific calcium channel subunits, and active zone proteins, RIM1 and RIM2. RIMs are part of the matrix at the presynaptic active zone and are associated with synaptic vesicles through their interaction with the small GTPase Rab3. RIM-BPs play a role in regulating synaptic transmission by serving as adaptors and linking calcium channels with the synaptic vesicle release machinery. RIM-BPs contain three SH3 domains and two to three fibronectin III repeats. Invertebrates contain one, while vertebrates contain at least two RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called peripheral-type benzodiazapine receptor associated protein 1 (PRAX-1). Mammals contain a third protein, RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly expressed in the brain where they display overlapping but distinct expression patterns, while RIM-BP3 is almost exclusively expressed in the testis and is essential in spermiogenesis. The SH3 domains of RIM-BPs bind to the PxxP motifs of RIM1, RIM2, and L-type (alpha1D) and N-type (alpha1B) calcium channel subunits. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212946 Cd Length: 61 Bit Score: 37.74 E-value: 2.57e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1008 IAMYTYESSE-------QGDLTFQQGDVILV---TKKDGdWWTGTVGDKAGVFPSNYVR 1056
Cdd:cd12013    3 VALFDYDPREsspnvdaEVELSFRAGDIITVfgeMDEDG-FYYGELNGQRGLVPSNFLE 60

DNA double-strand break repair Rad50 ATPase;

Pssm-ID: 179385 [Multi-domain] Cd Length: 880 Bit Score: 42.72 E-value: 2.64e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   352 DKKRENFErgnlELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKQLEKQRELERQREEerrkei 431
Cdd:PRK02224  471 EEDRERVE----ELEAELEDLEEEVEEVEERLERAEDLVEAEDRIERLEERREDLEELIAERRETIEEKRERAE------ 540

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   432 eRREAAKRELERQRQlEWeRNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNdkkhqlegKLQDIRCRLTTQRQEIE 511
Cdd:PRK02224  541 -ELRERAAELEAEAE-EK-REAAAEAEEEAEEAREEVAELNSKLAELKERIESLE--------RIRTLLAAIADAEDEIE 609

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   512 STNKSRElriaeithlqqqlqesqqmlgrlipEKQILNDQLKQvqqnslhrdslvtlkrALEAKELARQHLRDQLDEvek 591
Cdd:PRK02224  610 RLREKRE-------------------------ALAELNDERRE----------------RLAEKRERKRELEAEFDE--- 645

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   592 etrsklqeidifnNQLKELREihNKQQLQKQKSMEAERLKQKEQERKiiELEKQ----KEEAQRRAQERDkqwlEHVQQE 667
Cdd:PRK02224  646 -------------ARIEEARE--DKERAEEYLEQVEEKLDELREERD--DLQAEigavENELEELEELRE----RREALE 704

                         330
                  ....*....|..
gi 47717123   668 DEHQRPRKLHEE 679
Cdd:PRK02224  705 NRVEALEALYDE 716

Src Homology 3 domain of Tec-like Protein Tyrosine Kinases; The Tec (Tyrosine kinase expressed in hepatocellular carcinoma) subfamily is composed of Tec, Btk, Bmx (Etk), Itk (Tsk, Emt), Rlk (Txk), and similar proteins. They are cytoplasmic (or nonreceptor) tyr kinases containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. Most Tec subfamily members (except Rlk) also contain an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation. In addition, some members contain the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. Tec kinases are expressed mainly by haematopoietic cells, although Tec and Bmx are also found in endothelial cells. B-cells express Btk and Tec, while T-cells express Itk, Txk, and Tec. Collectively, Tec kinases are expressed in a variety of myeloid cells such as mast cells, platelets, macrophages, and dendritic cells. Each Tec kinase shows a distinct cell-type pattern of expression. The function of Tec kinases in lymphoid cells have been studied extensively. They play important roles in the development, differentiation, maturation, regulation, survival, and function of B-cells and T-cells. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212702 [Multi-domain] Cd Length: 54 Bit Score: 37.64 E-value: 2.65e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1080 QVIA--SYTATGPEQLTLAPGQ-LILIRKKNPGgWWegelQARGKKRQIGWFPANYVK 1134
Cdd:cd11768    1 IVVAlyDFQPIEPGDLPLEKGEeYVVLDDSNEH-WW----RARDKNGNEGYIPSNYVT 53

C2 domain second repeat present in Synaptotagmin 17; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Synaptotagmin 17 is located in the brain, kidney, and prostate and is thought to be a peripheral membrane protein. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 176055 [Multi-domain] Cd Length: 135 Bit Score: 39.87 E-value: 2.65e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTMGSQCHITKT-----IQDTLNPKWNSNCQFFI--RDLEQEVLCITVFERDQ 1668
Cdd:cd08410   14 GRLNVDIIRAKQLLQTDMSQGSDPFVKIQLVHGLKLIKTkktscMRGTIDPFYNESFSFKVpqEELENVSLVFTVYGHNV 93

                         90
                 ....*....|..
gi 47717123 1669 FSPDDFLGRTEI 1680
Cdd:cd08410   94 KSSNDFIGRIVI 105

Domain of unknown function (DUF4670); This family of proteins is found in eukaryotes. Proteins in this family are typically between 373 and 763 amino acids in length.

Pssm-ID: 464815 [Multi-domain] Cd Length: 522 Bit Score: 42.25 E-value: 2.67e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    338 EQQQLEKKLPVTFEDKKRENFERGnlELEKRRQALLEQQ-RKEQERLAqlERAEQERKE--RERQEQERKRQLELEKQle 414
Cdd:pfam15709  424 QQEEFRRKLQELQRKKQQEEAERA--EAEKQRQKELEMQlAEEQKRLM--EMAEEERLEyqRQKQEAEEKARLEAEER-- 497

                           90       100       110
                   ....*....|....*....|....*....|..
gi 47717123    415 kqrelerQREEERRKEIERREAAKRELERQRQ 446
Cdd:pfam15709  498 -------RQKEEEAARLALEEAMKQAQEQARQ 522

N-terminal (or first) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. The N-terminal SH3 domain increases the affinity of p67phox for the oxidase complex. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212804 Cd Length: 54 Bit Score: 37.57 E-value: 2.69e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123 1163 MYDYTAQNDDELAFNKGQIINVLNKEDPDWWKGEVNGQVGLFPSNYVK 1210
Cdd:cd11871    5 LYEFVPETKEELQVLPGNIVFVLKKGTDNWATVVFNGKKGLVPCNFLE 52

Crescentin protein; This entry represents a bacterial equivalent to Intermediate Filament proteins, named crescentin, whose cytoskeletal function is required for the vibrioid and helical shapes of Caulobacter crescentus. Without crescentin, the cells adopt a straight-rod morphology. Crescentin has characteriztic features of IF proteins including the ability to assemble into filaments in vitro without energy or cofactor requirements. In vivo, crescentin forms a helical structure that colocalizes with the inner cell curvatures beneath the cytoplasmic membrane.

Pssm-ID: 437057 [Multi-domain] Cd Length: 401 Bit Score: 41.98 E-value: 2.69e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    364 ELEKRRQALLEQQRKEQERLAQLERAEQERkERERQEQeRKRQLELEKQLEkqrelerqreeerrkeierreaakrELER 443
Cdd:pfam19220   73 GLTRRLSAAEGELEELVARLAKLEAALREA-EAAKEEL-RIELRDKTAQAE-------------------------ALER 125

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    444 QRQLEWERNR-------------------RQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLT 504
Cdd:pfam19220  126 QLAAETEQNRaleeenkalreeaqaaekaLQRAEGELATARERLALLEQENRRLQALSEEQAAELAELTRRLAELETQLD 205

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    505 TQRQEIESTnksrELRIAEIThlqqqlqesqqmlgrliPEKQILNDQLKqvQQNSLHRDSLVTLKRALEAKEL------- 577
Cdd:pfam19220  206 ATRARLRAL----EGQLAAEQ-----------------AERERAEAQLE--EAVEAHRAERASLRMKLEALTAraaateq 262

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    578 ----ARQHLRDQ----------LDEVEKETRSKLQEIDIFNNQLKELREIHN-----KQQLQKQKSMEAERLKQKEQ--- 635
Cdd:pfam19220  263 llaeARNQLRDRdeairaaerrLKEASIERDTLERRLAGLEADLERRTQQFQemqraRAELEERAEMLTKALAAKDAale 342

                          330       340       350       360       370
                   ....*....|....*....|....*....|....*....|....*....|....
gi 47717123    636 --ERKIIELEKQKEEAQRRaQERDKQWLEhvqqedehQRPRKLHEEekLKREES 687
Cdd:pfam19220  343 raEERIASLSDRIAELTKR-FEVERAALE--------QANRRLKEE--LQRERA 385

C2 domain second repeat in Copine; There are 2 copies of the C2 domain present in copine, a protein involved in membrane trafficking, protein-protein interactions, and perhaps even cell division and growth. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 176012 [Multi-domain] Cd Length: 110 Bit Score: 39.09 E-value: 2.71e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1603 VEGIELKPCRSHGKSNPYCEVTMGS------QCHITKTIQDTLNPKWNsncQFFIR-------DLEQEVLcITVFERDQF 1669
Cdd:cd04047    7 FSGKKLDKKDFFGKSDPFLEISRQSedgtwvLVYRTEVIKNTLNPVWK---PFTIPlqklcngDYDRPIK-IEVYDYDSS 82

                         90       100
                 ....*....|....*....|.
gi 47717123 1670 SPDDFLGRTEIRVADIKKDQG 1690
Cdd:cd04047   83 GKHDLIGEFETTLDELLKSSP 103

chromosome segregation protein; Provisional

Pssm-ID: 100796 [Multi-domain] Cd Length: 895 Bit Score: 42.58 E-value: 2.71e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   453 RRQELLNQR---NKEQEDIVVLKAKKKTLEFELEALNDKKHQLegklqdircrlttQRQEIESTNKSRELRIAEITHLQq 529
Cdd:PRK01156  150 QRKKILDEIleiNSLERNYDKLKDVIDMLRAEISNIDYLEEKL-------------KSSNLELENIKKQIADDEKSHSI- 215

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   530 qlqesqqmlgrLIPEKQILNDQLKQVQQNSLHRDSlvTLKRALEAKELArqhlrDQLDEVEKETRSKLQEIDIFNNQLKE 609
Cdd:PRK01156  216 -----------TLKEIERLSIEYNNAMDDYNNLKS--ALNELSSLEDMK-----NRYESEIKTAESDLSMELEKNNYYKE 277

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   610 LREIHN--------------------KQQLQKQKSM----EAERLKQKEQERKIIELEK---QKEEAQRRAQERDKQWLE 662
Cdd:PRK01156  278 LEERHMkiindpvyknrnyindyfkyKNDIENKKQIlsniDAEINKYHAIIKKLSVLQKdynDYIKKKSRYDDLNNQILE 357

                         250       260
                  ....*....|....*....|....
gi 47717123   663 HVQQEDEHQRPRKLHEEEKLKREE 686
Cdd:PRK01156  358 LEGYEMDYNSYLKSIESLKKKIEE 381

C2 domain present in Phosphoinositide-specific phospholipases C (PLC); PLCs are involved in the hydrolysis of phosphatidylinositol-4,5-bisphosphate (PIP2) to d-myo-inositol-1,4,5-trisphosphate (1,4,5-IP3) and sn-1,2-diacylglycerol (DAG). 1,4,5-IP3 and DAG are second messengers in eukaryotic signal transduction cascades. PLC is composed of a N-terminal PH domain followed by a series of EF hands, a catalytic TIM barrel and a C-terminal C2 domain. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members here have a type-II topology.

Pssm-ID: 175974 [Multi-domain] Cd Length: 128 Bit Score: 39.45 E-value: 2.79e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1615 GKSNPYCEVTM-----GSQC-HITKTIQD-TLNPKWNSNCQFFIRDLEQEVLCITVFERDQFSpDDFLGRTEIRVADIKK 1687
Cdd:cd00275   23 SIVDPYVEVEIhglpaDDSAkFKTKVVKNnGFNPVWNETFEFDVTVPELAFLRFVVYDEDSGD-DDFLGQACLPLDSLRQ 101

First Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212707 [Multi-domain] Cd Length: 57 Bit Score: 37.40 E-value: 2.82e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVI-LVTKKDGDWWT----GTVGD---KAGVFPSNY 1054
Cdd:cd11773    4 ALYDYEPQTEDELTIQEDDILyLLEKSDDDWWKvklkVNSSDddePVGLVPATY 57

Src homology 3 domain of Phospholipase C (PLC) gamma 2; PLCgamma2 is primarily expressed in haematopoietic cells, specifically in B cells. It is activated by tyrosine phosphorylation by B cell receptor (BCR) kinases and is recruited to the plasma membrane where its substrate is located. It is required in pre-BCR signaling and in the maturation of B cells. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212902 Cd Length: 55 Bit Score: 37.51 E-value: 2.82e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVI-TVLEQQDMWWFGEVQGQ-KGWFPKSYVK 967
Cdd:cd11969    3 KALYDYRAKRSDELSFCKGALIhNVSKETGGWWKGDYGGKvQHYFPSNYVE 53

Src Homology 3 domain of Rho GTPase-activating protein 9 and similar proteins; This subfamily is composed of Rho GTPase-activating proteins including mammalian ARHGAP9, and vertebrate ARHGAPs 12 and 27. RhoGAPs (or ARHGAPs) bind to Rho proteins and enhance the hydrolysis rates of bound GTP. ARHGAP9 functions as a GAP for Rac and Cdc42, but not for RhoA. It negatively regulates cell migration and adhesion. It also acts as a docking protein for the MAP kinases Erk2 and p38alpha, and may facilitate cross-talk between the Rho GTPase and MAPK pathways to control actin remodeling. ARHGAP27, also called CAMGAP1, shows GAP activity towards Rac1 and Cdc42. It binds the adaptor protein CIN85 and may play a role in clathrin-mediated endocytosis. ARHGAP12 has been shown to display GAP activity towards Rac1. It plays a role in regulating HFG-driven cell growth and invasiveness. ARHGAPs in this subfamily contain SH3, WW, Pleckstin homology (PH), and RhoGAP domains. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212821 [Multi-domain] Cd Length: 54 Bit Score: 37.35 E-value: 2.88e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1164 YDYTAQNDDELAFNKGQIINVLNKEDPDWW--KGEVNGQVGLFPSNY 1208
Cdd:cd11888    8 FEYTGKDGRKVSIKEGERFLLLKKSNDDWWqvRRPGDSKPFYVPAQY 54

First Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212695 [Multi-domain] Cd Length: 57 Bit Score: 37.34 E-value: 2.94e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVKgEWVDESqtgepGWLGG-ELKGKTGWFPANYAEK 803
Cdd:cd11761    6 VLYSYEAQRPDELTITEGEELEVI-EDGDGD-----GWVKArNKSGEVGYVPENYLQF 57

Third Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212717 [Multi-domain] Cd Length: 55 Bit Score: 37.37 E-value: 3.04e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVKGEWVDesqtgepGWLGGE--LKGKTGWFPANY 800
Cdd:cd11783    2 YVALYPYKPQKPDELELRKGEMYTVTEKCQD-------GWFKGTslRTGQSGVFPGNY 52

Second Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212708 [Multi-domain] Cd Length: 52 Bit Score: 37.44 E-value: 3.11e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILV-TKKDGDW-WTGTVGDKAGVFPSNYV 1055
Cdd:cd11774    4 ALYDYDKQTEEELSFNEGDTLDVyDDSDSDWiLVGFNGTQFGFVPANYI 52

First Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212854 Cd Length: 55 Bit Score: 37.59 E-value: 3.15e-03

                         10        20        30
                 ....*....|....*....|....*....|....*....
gi 47717123 1020 DLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11921   16 ELTLQKGDIVYIHKEvDKNWLEGEHHGRVGIFPANYVEV 54

Membrane protein TolA involved in colicin uptake [Cell wall/membrane/envelope biogenesis];

Pssm-ID: 442298 [Multi-domain] Cd Length: 485 Bit Score: 41.95 E-value: 3.15e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  327 QRLPEEPVLEDEQQQLEKKLPVTFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERaEQERKERERQEQERKRQ 406
Cdd:COG3064   16 ERLEQAEAEKRAAAEAEQKAKEEAEEERLAELEAKRQAEEEAREAKAEAEQRAAELAAEAAK-KLAEAEKAAAEAEKKAA 94

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  407 LELEKQLEKQRELERQREEERRKEIERREAAKRELERQRQLEWErNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALN 486
Cdd:COG3064   95 AEKAKAAKEAEAAAAAEKAAAAAEKEKAEEAKRKAEEEAKRKAE-EERKAAEAEAAAKAEAEAARAAAAAAAAAAAAAAR 173

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  487 DKKHQLEGKLQDIRCRLTTQRQEIESTNKSRELRIAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSLHRDSLV 566
Cdd:COG3064  174 AAAGAAAALVAAAAAAVEAADTAAAAAAALAAAAAAAAADAALLALAVAARAAAASREAALAAVEATEEAALGGAEEAAD 253

                        250       260       270       280       290       300       310       320
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  567 TLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHnkqqlqkQKSMEAERLKQKEQERKIIELEKQK 646
Cdd:COG3064  254 LAAVGVLGAALAAAAAGAAALSSGLVVVAAALAGLAAAAAGLVLDDSA-------ALAAELLGAVAAEEAVLAAAAAAGA 326

                        330       340       350       360       370       380
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  647 EEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKREESVKKKDGEEKGKQEAQDKLGR 707
Cdd:COG3064  327 LVVRGGGAASLEAALSLLAAGAAAAAAGAGALATGALGDALAAEAAGALLLGKLADVEEAA 387

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 2; SKAP2, also called SKAP55-Related (SKAP55R) or SKAP55 homolog (SKAP-HOM or SKAP55-HOM), is an immune cell-specific adaptor protein that plays an important role in adhesion and migration of B-cells and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), YopH, SHPS1, and HPK1. SKAP2 has also been identified as a substrate for lymphoid-specific tyrosine phosphatase (Lyp), which has been implicated in a wide variety of autoimmune diseases. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. Like SKAP1, SKAP2 is expected to bind primarily to a proline-rich region of ADAP through its SH3 domain; its degradation may be regulated by ADAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212978 Cd Length: 53 Bit Score: 37.19 E-value: 3.16e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQ-DM--WWFGEVQGQKGWFPKSYV 966
Cdd:cd12045    3 QGLWDCTGDQPDELSFKRGDTIYILSKEyNRfgWWVGEMKGTIGLVPKAYI 53

Second or C-terminal Src homology 3 domain of the p47phox subunit of NADPH oxidase, also called Neutrophil Cytosolic Factor 1; p47phox, or NCF1, is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox), which plays a key role in the ability of phagocytes to defend against bacterial infections. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p47phox is required for activation of NADH oxidase and plays a role in translocation. It contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), a polybasic/autoinhibitory region, and a C-terminal proline-rich region (PRR). This model characterizes the second SH3 domain (or C-SH3) of p47phox. In its inactive state, the tandem SH3 domains interact intramolecularly with the autoinhibitory region; upon activation, the tandem SH3 domains are exposed through a conformational change, resulting in their binding to the PRR of p22phox and the activation of NADPH oxidase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212955 [Multi-domain] Cd Length: 53 Bit Score: 37.51 E-value: 3.17e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTKK--DGdWWTGTVGDKAGVFPSNYV 1055
Cdd:cd12022    2 YITIKAYTAVEEDELTLLEGEAIEVIHKllDG-WWVVRKGEVTGYFPSMYL 51

Ciliary protein causing Leber congenital amaurosis disease; Lebercilin is a family of eukaryotic ciliary proteins. Mutations in the gene, LCA5, are implicated in the disease Leber congenital amaurosis. In photoreceptors, lebercilin is uniquely localized at the cilium that bridges the inner and outer segments. Lebercilin functions as an integral element of selective protein transport through photoreceptor cilia. Lebercilin specifically interacts with the intraflagellar transport (IFT), and disruption of IFT can lead to Leber congenital amaurosis.

Pssm-ID: 464776 [Multi-domain] Cd Length: 193 Bit Score: 40.66 E-value: 3.21e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    353 KKRENFERGNLELEKRRQALLeqqrKEQERLAQLERAEQERKERERQEQERKRQlELEKQLEKQRElerqreeerrkeie 432
Cdd:pfam15619   78 RLQEKERDLERKLKEKEAELL----RLRDQLKRLEKLSEDKNLAEREELQKKLE-QLEAKLEDKDE-------------- 138

                           90       100       110       120       130       140
                   ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 47717123    433 rreaAKRELERQRQLEwERNRRQELLNQRNKEQEdivvLKAKKKTLEFELEALNDKKHQLEGKL 496
Cdd:pfam15619  139 ----KIQDLERKLELE-NKSFRRQLAAEKKKHKE----AQEEVKILQEEIERLQQKLKEKEREL 193

Src Homology 3 domain of the p40phox subunit of NADPH oxidase; p40phox, also called Neutrophil cytosol factor 4 (NCF-4), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p40phox positively regulates NADPH oxidase in both phosphatidylinositol-3-phosphate (PI3P)-dependent and PI3P-independent manner. It contains an N-terminal PX domain, a central SH3 domain, and a C-terminal PB1 domain that interacts with p67phox. The SH3 domain of p40phox binds to canonical polyproline and noncanonical motifs at the C-terminus of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212802 Cd Length: 54 Bit Score: 37.47 E-value: 3.34e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQKGWFPKSYVKLI 969
Cdd:cd11869    1 RAEALFDFTGNSKLELNFKAGDVIFLLSRVNKDWLeGTVRGATGIFPLSFVKII 54

Src homology 3 domain of SH3 protein interacting with Nck, 90 kDa (SPIN90); SPIN90 is also called NCK interacting protein with SH3 domain (NCKIPSD), Dia-interacting protein (DIP), 54 kDa vimentin-interacting protein (VIP54), or WASP-interacting SH3-domain protein (WISH). It is an F-actin binding protein that regulates actin polymerization and endocytosis. It associates with the Arp2/3 complex near actin filaments and determines filament localization at the leading edge of lamellipodia. SPIN90 is expressed in the early stages of neuronal differentiation and plays a role in regulating growth cone dynamics and neurite outgrowth. It also interacts with IRSp53 and regulates cell motility by playing a role in the formation of membrane protrusions. SPIN90 contains an N-terminal SH3 domain, a proline-rich domain, and a C-terminal VCA (verprolin-homology and cofilin-like acidic) domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212783 [Multi-domain] Cd Length: 53 Bit Score: 37.29 E-value: 3.44e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123 1009 AMYTYESSEQGDLTFQQGDV-ILVTKKDGDWW-----TGTVgdkaGVFPSNYVR 1056
Cdd:cd11849    4 ALYDFKSAEPNTLSFSEGETfLLLERSNAHWWlvtnhSGET----GYVPANYVK 53

Hyaluronan mediated motility receptor N-terminal; HMMR_N is the N-terminal region of eukaryotic hyaluronan-mediated motility receptor proteins. The protein is functionally associated with BRCA1 and thus predicted to be a common, low-penetrance breast cancer candidate.

Pssm-ID: 464932 [Multi-domain] Cd Length: 329 Bit Score: 41.72 E-value: 3.46e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    344 KKLPVTFED-----KKRENFERGNLELEK--------RRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELE 410
Cdd:pfam15905   17 LKGPVSFEKsqrfrKQKAAESQPNLNNSKdastpataRKVKSLELKKKSQKNLKESKDQKELEKEIRALVQERGEQDKRL 96

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    411 KQLEKQRELERQREEERRKEIERREAAKRELERQRQlewERNRRQELL--------NQRNKEQEDIVVLKAKKKtLEFEL 482
Cdd:pfam15905   97 QALEEELEKVEAKLNAAVREKTSLSASVASLEKQLL---ELTRVNELLkakfsedgTQKKMSSLSMELMKLRNK-LEAKM 172

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    483 EALNDKKHQLEGKLQDIRCRLTTQRQEI---ESTNKSRELRIAEithlqqqlqesqqmlgrlipEKQILNDQLKQVQQNS 559
Cdd:pfam15905  173 KEVMAKQEGMEGKLQVTQKNLEHSKGKVaqlEEKLVSTEKEKIE--------------------EKSETEKLLEYITELS 232

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    560 LHRDSLVTLKRALeakelarqhlrDQLDEVEKEtrsKLQEIDIFNNQLKElreihNKQQLQKQksmeaerlkQKEQERKI 639
Cdd:pfam15905  233 CVSEQVEKYKLDI-----------AQLEELLKE---KNDEIESLKQSLEE-----KEQELSKQ---------IKDLNEKC 284

                          330       340       350       360
                   ....*....|....*....|....*....|....*....|....
gi 47717123    640 IELEKQKEEAQRRAQERDK------QWLEH--VQQEDEHQRPRK 675
Cdd:pfam15905  285 KLLESEKEELLREYEEKEQtlnaelEELKEklTLEEQEHQKLQQ 328

Src homology 3 domain of SH3 protein interacting with Nck, 90 kDa (SPIN90); SPIN90 is also called NCK interacting protein with SH3 domain (NCKIPSD), Dia-interacting protein (DIP), 54 kDa vimentin-interacting protein (VIP54), or WASP-interacting SH3-domain protein (WISH). It is an F-actin binding protein that regulates actin polymerization and endocytosis. It associates with the Arp2/3 complex near actin filaments and determines filament localization at the leading edge of lamellipodia. SPIN90 is expressed in the early stages of neuronal differentiation and plays a role in regulating growth cone dynamics and neurite outgrowth. It also interacts with IRSp53 and regulates cell motility by playing a role in the formation of membrane protrusions. SPIN90 contains an N-terminal SH3 domain, a proline-rich domain, and a C-terminal VCA (verprolin-homology and cofilin-like acidic) domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212783 [Multi-domain] Cd Length: 53 Bit Score: 37.29 E-value: 3.47e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWF-GEVQGQKGWFPKSYVK 967
Cdd:cd11849    3 RALYDFKSAEPNTLSFSEGETFLLLERSNAhWWLvTNHSGETGYVPANYVK 53

Glutamine-rich N-terminal helical domain of HDAC5, a Class IIa histone deacetylase; This family consists of the glutamine-rich domain of histone deacetylase 5 (HDAC5). It belongs to a superfamily that consists of the glutamine-rich N-terminal helical extension to certain Class IIa histone deacetylases (HDACs), including HDAC4, HDAC5 and HDCA9; it is missing from HDAC7. This domain confers responsiveness to calcium signals and mediates interactions with transcription factors and cofactors, and it is able to repress transcription independently of the HDAC C-terminal, zinc-dependent catalytic domain. It has many intra- and inter-helical interactions which are possibly involved in reversible assembly and disassembly of proteins. HDACs regulate diverse cellular processes through enzymatic deacetylation of histone as well as non-histone proteins, in particular deacetylating N(6)-acetyl-lysine residues.

Pssm-ID: 197400 [Multi-domain] Cd Length: 97 Bit Score: 38.65 E-value: 3.49e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  326 DQRLPEEPVLEDEQQQLEKKLPVTFEDKKRENFERGN-----LELEKRRQALLEQQRKEQERLAQLERAEQERKeRERQE 400
Cdd:cd10164    6 EQQLQQELLLLKQQQQLQKQLLFAEFQKQHEHLTRQHevqlqKHLKVRAELFSEQQQQEILAAKRQQELEQQRK-REQQR 84

                         90
                 ....*....|...
gi 47717123  401 QERKRQLELEKQL 413
Cdd:cd10164   85 QEELEKQRLEQQL 97

putative monovalent cation/H+ antiporter subunit G; Reviewed

Pssm-ID: 183610 Cd Length: 197 Bit Score: 40.44 E-value: 3.53e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   582 LRDQLDEVEKETRSKLQEIDIFNNQLKELReihnkqqlQKQKSMEaERLKQKEQERKIIELEKQKEEAQrraqERDKQWL 661
Cdd:PRK12585  103 IRDQLRSVKKDDIKKKKSLIIRQEQIEKAR--------QEREELE-ERMEWERREEKIDEREDQEEQER----EREEQTI 169

                          90
                  ....*....|
gi 47717123   662 EHVQQEDEHQ 671
Cdd:PRK12585  170 EEQSDDSEHE 179

Src homology 3 domain of Src kinase-like Protein Tyrosine Kinases; Src subfamily members include Src, Lck, Hck, Blk, Lyn, Fgr, Fyn, Yrk, Yes, and Brk. Src (or c-Src) proteins are cytoplasmic (or non-receptor) PTKs which are anchored to the plasma membrane. They contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation sites. Src proteins are involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. They were identified as the first proto-oncogene products, and they regulate cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Src kinases are overexpressed in a variety of human cancers, making them attractive targets for therapy. They are also implicated in acute inflammatory responses and osteoclast function. Src, Fyn, Yes, and Yrk are widely expressed, while Blk, Lck, Hck, Fgr, Lyn, and Brk show a limited expression pattern. This subfamily also includes Drosophila Src42A, Src oncogene at 42A (also known as Dsrc41) which accumulates at sites of cell-cell or cell-matrix adhesion, and participates in Drosphila development and wound healing. It has been shown to promote tube elongation in the tracheal system, is essential for proper cell-cell matching during dorsal closure, and regulates cell-cell contacts in developing Drosophila eyes. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212779 [Multi-domain] Cd Length: 52 Bit Score: 37.18 E-value: 3.53e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123 1080 QVIA--SYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGKKrqiGWFPANY 1132
Cdd:cd11845    1 IYVAlyDYEARTDDDLSFKKGDRLQILDDSDGDWWLARHLSTGKE---GYIPSNY 52

RIM-binding protein of the cytomatrix active zone; This is a family of proteins that form part of the CAZ (cytomatrix at the active zone) complex which is involved in determining the site of synaptic vesicle fusion. The C-terminus is a PDZ-binding motif that binds directly to RIM (a small G protein Rab-3A effector). The family also contains four coiled-coil domains.

Pssm-ID: 431111 [Multi-domain] Cd Length: 766 Bit Score: 42.12 E-value: 3.56e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    371 ALLEQQRKEQERLAQLERAEQERKERERQE---QERKRQLELEKQL-----EKQRELERQREEERRKEIERREAAKRElE 442
Cdd:pfam10174  439 TTLEEALSEKERIIERLKEQREREDRERLEeleSLKKENKDLKEKVsalqpELTEKESSLIDLKEHASSLASSGLKKD-S 517

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    443 RQRQLEWERNRRQE----LLNQRNKEQEDIVVLKAKK------KTLEFELEALNDKKHQLEGKLQdircRLTTQRQEIES 512
Cdd:pfam10174  518 KLKSLEIAVEQKKEecskLENQLKKAHNAEEAVRTNPeindriRLLEQEVARYKEESGKAQAEVE----RLLGILREVEN 593

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    513 TNKSRELRIAEIthlqqqlqesQQMLGRLIPEKQILNDQLKQVQQnSLHRDSLVTLKRALEAKE-LARQHLRDQLDEVEK 591
Cdd:pfam10174  594 EKNDKDKKIAEL----------ESLTLRQMKEQNKKVANIKHGQQ-EMKKKGAQLLEEARRREDnLADNSQQLQLEELMG 662

                          250       260       270       280       290
                   ....*....|....*....|....*....|....*....|....*....|.
gi 47717123    592 ETRSKLQEIDIFNNQLKEL------REIH-NKQQLQKQKSMEaERLKQKEQ 635
Cdd:pfam10174  663 ALEKTRQELDATKARLSSTqqslaeKDGHlTNLRAERRKQLE-EILEMKQE 712

Src Homology 3 domain of Sorting nexin 9; Sorting nexin 9 (SNX9), also known as SH3PX1, is a cytosolic protein that interacts with proteins associated with clathrin-coated pits such as Cdc-42-associated tyrosine kinase 2 (ACK2). It binds class I polyproline sequences found in dynamin 1/2 and the WASP/N-WASP actin regulators. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis. Its array of interacting partners suggests that SNX9 functions at the interface between endocytosis and actin cytoskeletal organization. SNXs are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNX9 also contains BAR and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212831 Cd Length: 57 Bit Score: 37.15 E-value: 3.57e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123 1079 AQVIASYTA-TGPEQLTLAPGQLILIRKKNPGGWWegeLQARGKKRQIGWFPANYVKLL 1136
Cdd:cd11898    2 ARVLYDFAAePGNNELTVKEGEIITVTNPNVGGGW---IEAKNSQGERGLVPTDYVEIV 57

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 37.30 E-value: 3.58e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARgkkrqIGWFPANYVKLL 1136
Cdd:cd11920    3 ARAVYDFKAQTSKELSFKKGDTVYILRKIDQNWYEGEHHGR-----VGIFPISYVEKL 55

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 42.23 E-value: 3.65e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  355 RENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKQLEKQRELERQREEERRKEIERR 434
Cdd:COG1196  629 AARLEAALRRAVTLAGRLREVTLEGEGGSAGGSLTGGSRRELLAALLEAEAELEELAERLAEEELELEEALLAEEEEERE 708

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  435 EAAKRELERQRQLEWERNRRQELLNQRNKEQEDIVVLKAKKKTLEFELEALNDKKhQLEGKLQdircRLTTQRQEIESTN 514
Cdd:COG1196  709 LAEAEEERLEEELEEEALEEQLEAEREELLEELLEEEELLEEEALEELPEPPDLE-ELERELE----RLEREIEALGPVN 783

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  515 ksreLRiAEithlqqqlqesqqmlgrlipekqilnDQLKQVQQnslhR-DSLVTlKRA-LEAkelARQHLRDQLDEVEKE 592
Cdd:COG1196  784 ----LL-AI--------------------------EEYEELEE----RyDFLSE-QREdLEE---ARETLEEAIEEIDRE 824


                 ....*..
gi 47717123  593 TRSKLQE 599
Cdd:COG1196  825 TRERFLE 831

Exopolysaccharide export protein/domain GumC/Wzc1 [Cell wall/membrane/envelope biogenesis];

Pssm-ID: 442439 [Multi-domain] Cd Length: 687 Bit Score: 41.93 E-value: 3.73e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  391 QERKERERQEQERKRQLELEKQLEKqrelerqreeerrkeierreaAKRELERQRQlewernRRQELlnqrnKEQEDIVV 470
Cdd:COG3206  162 LEQNLELRREEARKALEFLEEQLPE---------------------LRKELEEAEA------ALEEF-----RQKNGLVD 209

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  471 LKAKKKTLEFELEALNDKKHQLEGKLQDIRcrltTQRQEIESTNKSRELRIAEITHLqqqlqesqqmlgrliPEKQILND 550
Cdd:COG3206  210 LSEEAKLLLQQLSELESQLAEARAELAEAE----ARLAALRAQLGSGPDALPELLQS---------------PVIQQLRA 270

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  551 QLKQVQQnslhrdslvtlKRALEAKELARQH-----LRDQLDEVEKETRSKLQEIDI-FNNQLKELREihNKQQLQKQKS 624
Cdd:COG3206  271 QLAELEA-----------ELAELSARYTPNHpdviaLRAQIAALRAQLQQEAQRILAsLEAELEALQA--REASLQAQLA 337

                        250       260
                 ....*....|....*....|....*...
gi 47717123  625 -MEAERLKQKEQERKIIELEKQKEEAQR 651
Cdd:COG3206  338 qLEARLAELPELEAELRRLEREVEVARE 365

C2 domain second repeat present in Synaptotagmin 7; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Synaptotagmin 7, a member of class 2 synaptotagmins, is located in presynaptic plasma membranes in neurons, dense-core vesicles in endocrine cells, and lysosomes in fibroblasts. It has been shown to play a role in regulation of Ca2+-dependent lysosomal exocytosis in fibroblasts and may also function as a vesicular Ca2+-sensor. It is distinguished from the other synaptotagmins by having over 12 splice forms. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 176050 [Multi-domain] Cd Length: 136 Bit Score: 39.32 E-value: 3.73e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTM---GSQCHITKTI--QDTLNPKWNSNCQF-----FIRDLEqevLCITVFE 1665
Cdd:cd08405   15 NRITVNIIKARNLKAMDINGTSDPYVKVWLmykDKRVEKKKTVikKRTLNPVFNESFIFnipleRLRETT---LIITVMD 91

                         90
                 ....*....|..
gi 47717123 1666 RDQFSPDDFLGR 1677
Cdd:cd08405   92 KDRLSRNDLIGK 103

RIM-binding protein of the cytomatrix active zone; This is a family of proteins that form part of the CAZ (cytomatrix at the active zone) complex which is involved in determining the site of synaptic vesicle fusion. The C-terminus is a PDZ-binding motif that binds directly to RIM (a small G protein Rab-3A effector). The family also contains four coiled-coil domains.

Pssm-ID: 431111 [Multi-domain] Cd Length: 766 Bit Score: 42.12 E-value: 3.81e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    364 ELEKRRQALLEQQRKE----QERLAQLE-RAEQERKERERQEQERKRQLELeKQLEKQRELERQREEERRKEIERREAAK 438
Cdd:pfam10174  116 ENFRRLQSEHERQAKElfllRKTLEEMElRIETQKQTLGARDESIKKLLEM-LQSKGLPKKSGEEDWERTRRIAEAEMQL 194

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    439 RELERQ-RQLEWERNRRQELLNQRNKEQEDivvlKAKKKTLEFELEALNDKKHQLEGKLQDIRcrlttqrQEIESTNKSr 517
Cdd:pfam10174  195 GHLEVLlDQKEKENIHLREELHRRNQLQPD----PAKTKALQTVIEMKDTKISSLERNIRDLE-------DEVQMLKTN- 262

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    518 elriaeithlqqqlqesqqmlGRLIPEKQilNDQLKQVQQNSLHRDSLVT----LKRALEAKELARQHLRDQLD------ 587
Cdd:pfam10174  263 ---------------------GLLHTEDR--EEEIKQMEVYKSHSKFMKNkidqLKQELSKKESELLALQTKLEtltnqn 319

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    588 -------EVEKET-------RSKLQ-EIDIFNNQLKELREIHNK-----QQLQKQKSMEAERLKQKEQ-----ERKIIEL 642
Cdd:pfam10174  320 sdckqhiEVLKESltakeqrAAILQtEVDALRLRLEEKESFLNKktkqlQDLTEEKSTLAGEIRDLKDmldvkERKINVL 399

                          330
                   ....*....|....*..
gi 47717123    643 EKQKEEAQRRAQERDKQ 659
Cdd:pfam10174  400 QKKIENLQEQLRDKDKQ 416

Ca2+-dependent lipid-binding protein, contains C2 domain [General function prediction only];

Pssm-ID: 227371 [Multi-domain] Cd Length: 1227 Bit Score: 42.05 E-value: 4.09e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1593 TGIGRLMVNVVEGIELKPCRSH--GKSNPYCEVTMGSQCH-ITKTIQDTLNPKWNSNCQFFIRDLEQEvLCITVFERDQF 1669
Cdd:COG5038  433 TAIGVVEVKIKSAEGLKKSDSTinGTVDPYITVTFSDRVIgKTRVKKNTLNPVWNETFYILLNSFTDP-LNLSLYDFNSF 511

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123 1670 SPDDFLGRTEIRVADIKKDQGSKGPVTKcLLLHEVPTGEIVvrLDLQLF 1718
Cdd:COG5038  512 KSDKVVGSTQLDLALLHQNPVKKNELYE-FLRNTKNVGRLT--YDLRFF 557

Src Homology 3 domain of Calcium/calmodulin-dependent Serine protein Kinase; CASK is a scaffolding protein that is highly expressed in the mammalian nervous system and plays roles in synaptic protein targeting, neural development, and gene expression regulation. CASK interacts with many different binding partners including parkin, neurexin, syndecans, calcium channel proteins, caskin, among others, to perform specific functions in different subcellular locations. Disruption of the CASK gene in mice results in neonatal lethality while mutations in the human gene have been associated with X-linked mental retardation. Drosophila CASK is associated with both pre- and postsynaptic membranes and is crucial in synaptic transmission and vesicle cycling. CASK contains an N-terminal calmodulin-dependent kinase (CaMK)-like domain, two L27 domains, followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213014 Cd Length: 62 Bit Score: 37.19 E-value: 4.18e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1160 VIGMYDYTAQNDD-------ELAFNKGQIINVLNKEDPDWWKGE----VNGQVGLFPS 1206
Cdd:cd12081    2 VRAQFEYDPLKDDlipckqaGIRFRVGDILQIISKDDHNWWQAKlensKNGTAGLIPS 59

Guanylate-binding protein, C-terminal domain; Guanylate-binding protein (GBP), C-terminal domain. Guanylate-binding proteins (GBPs) are synthesized after activation of the cell by interferons. The biochemical properties of GBPs are clearly different from those of Ras-like and heterotrimeric GTP-binding proteins. They bind guanine nucleotides with low affinity (micromolar range), are stable in their absence, and have a high turnover GTPase. In addition to binding GDP/GTP, they have the unique ability to bind GMP with equal affinity and hydrolyze GTP not only to GDP, but also to GMP. This C-terminal domain has been shown to mediate inhibition of endothelial cell proliferation by inflammatory cytokines.

Pssm-ID: 293879 [Multi-domain] Cd Length: 291 Bit Score: 41.02 E-value: 4.21e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  370 QALLEQQRKEQErlaqlERAEQERKERERQEQERKRQlELEKQLEKQRelerqreeerrkeierreaaKRELERQRQLE- 448
Cdd:cd16269  191 QALTEKEKEIEA-----ERAKAEAAEQERKLLEEQQR-ELEQKLEDQE--------------------RSYEEHLRQLKe 244

                         90       100       110       120       130
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123  449 -WERNRRQELlnqrnKEQEDIVVLKAKKKTLEFElEALNDKKHQLEGKLQDIR 500
Cdd:cd16269  245 kMEEERENLL-----KEQERALESKLKEQEALLE-EGFKEQAELLQEEIRSLK 291

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Embryonal Fyn-associated Substrate; EFS is also called HEFS, CASS3 (Cas scaffolding protein family member 3) or SIN (Src-interacting protein). It was identified based on interactions with the Src kinases, Fyn and Yes. It plays a role in thymocyte development and acts as a negative regulator of T cell proliferation. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212936 Cd Length: 62 Bit Score: 37.18 E-value: 4.39e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKKDGD----WWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd12003    5 ALYDNAAESPEELSFRRGDVLMVLKREHGslpgWWLCSLHGQQGIAPANRLRL 57

Fourth Src homology 3 domain (or SH3D) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212926 Cd Length: 65 Bit Score: 37.40 E-value: 4.42e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  918 AQALYPWRAKKDNHLNFNKNDVITVLEQQ-DMWWFGEVQG-----QKGWFPKSYVKLIS 970
Cdd:cd11993    6 AQVIASYTATGPEQLTLAPGQLILIRKKNpGGWWEGELQArgkkrQIGWFPANYVKLLS 64

Second Src Homology 3 domain (SH3B) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CIN85. SH3B has been shown to bind Cbl proline-rich peptides and ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212988 [Multi-domain] Cd Length: 53 Bit Score: 36.90 E-value: 4.43e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVL-EQQDMWWFGEVQGQKGWFPKSYVK 967
Cdd:cd12055    1 RCQVAFSYLPQNEDELELKVGDIIEVVgEVEEGWWEGVLNGKTGMFPSNFIK 52

First Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212707 [Multi-domain] Cd Length: 57 Bit Score: 37.02 E-value: 4.61e-03

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|...
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGELK-------GKTGWFPANY 800
Cdd:cd11773    2 YKALYDYEPQTEDELTIQEDDILYL-------LEKSDDDWWKVKLKvnssdddEPVGLVPATY 57

C-terminal Src Homology 3 domain of the p67phox subunit of NADPH oxidase and similar proteins; This subfamily is composed of p67phox, NADPH oxidase activator 1 (Noxa1), and similar proteins. p67phox, also called Neutrophil cytosol factor 2 (NCF-2), and Noxa1 are homologs and are the cytosolic subunits of the phagocytic (Nox2) and nonphagocytic (Nox1) NADPH oxidase complexes, respectively. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox and Noxa1 play regulatory roles. p67phox contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. Noxa1 has a similar domain architecture except it is lacking the N-terminal SH3 domain. The TPR domain of both binds activated GTP-bound Rac, while the C-terminal SH3 domain of p67phox and Noxa1 binds the polyproline motif found at the C-terminus of p47phox and Noxo1, respectively. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212803 [Multi-domain] Cd Length: 53 Bit Score: 36.74 E-value: 4.62e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1080 QVIA--SYTATGPEQLTLAPGQLILIRKKNPGGWWEGElqARGKkrqIGWFPANYVK 1134
Cdd:cd11870    1 QVVAlhRYEAQGPEDLGFREGDTIDVLSEVNEAWLEGH--SDGR---VGIFPKCFVV 52

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212850 [Multi-domain] Cd Length: 61 Bit Score: 37.28 E-value: 4.70e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQK--GWFPKSYVK 967
Cdd:cd11917    8 QALYNYMPRNEDELELREGDVIDVMEKCDDGWFvGTSRRTKffGTFPGNYVK 59

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 36.91 E-value: 4.76e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*.
gi 47717123 1087 ATGPEQLTLAPGQLILIRKKNPGGWWEGELQarGKKRQIGWFPANY 1132
Cdd:cd11821   10 ADNDDELTFSEGEIIVVTGEEDDEWWEGHIE--GDPSRRGVFPVSF 53

Src homology 3 domain of Brk (Breast tumor kinase) Protein Tyrosine Kinase (PTK), also called PTK6; Brk is a cytoplasmic (or non-receptor) PTK with limited homology to Src kinases. It has been found to be overexpressed in a majority of breast tumors. It plays roles in normal cell differentiation, proliferation, survival, migration, and cell cycle progression. Brk substrates include RNA-binding proteins (SLM-1/2, Sam68), transcription factors (STAT3/5), and signaling molecules (Akt, paxillin, IRS-4). Src kinases in general contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr; they are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation site. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212781 [Multi-domain] Cd Length: 58 Bit Score: 37.15 E-value: 4.80e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  745 YRALYPFESRSHDEITIQPGD---IVMVKGEWVDESQTGEPGWLGGelkgkTGWFPANY 800
Cdd:cd11847    2 YKALWDFKARGDEELSFQAGDqfrIAERSGDWWTALKLDRAGGVVA-----QGFVPNNY 55

DNA damage checkpoint protein; This is a family of proteins which regulate checkpoint kinases. In Schizosaccharomyces pombe this protein is called Rad26 and in Saccharomyces cerevisiae it is called LCD1.

Pssm-ID: 462906 Cd Length: 615 Bit Score: 41.53 E-value: 4.80e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 47717123    582 LRDQLDEVEKEtrsKLQEIDIFNNQLKELREIHnKQQLQKQKSmEAERLkqkEQERKIIELEKQK 646
Cdd:pfam09798    2 LRDKLELLQQE---KEKELEKLKNSYEELKSSH-EEELEKLKQ-EVQKL---EDEKKFLLNELRS 58

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF5 and ARHGEF19; ARHGEF5, also called ephexin-3 or TIM (Transforming immortalized mammary oncogene), is a potent activator of RhoA and it plays roles in regulating cell shape, adhesion, and migration. It binds to the SH3 domain of Src and is involved in regulating Src-induced podosome formation. ARHGEF19, also called ephexin-2 or WGEF (weak-similarity GEF), is highly expressed in the intestine, liver, heart and kidney. It activates RhoA, Cdc42, and Rac 1, and has been shown to activate RhoA in the Wnt-PCP (planar cell polarity) pathway. It is involved in the regulation of cell polarity and cytoskeletal reorganization. ARHGEF5 and ARHGEF19 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212873 Cd Length: 55 Bit Score: 36.69 E-value: 4.82e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 47717123  917 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGEVQ---GQKGWFPKSYVKL 968
Cdd:cd11940    1 QVQCIRSYKAQENDELTLEKADIIMVRQQSSDGWLEGVRlsdGERGWFPQSHVEE 55

Guanylate-binding protein, C-terminal domain; Guanylate-binding protein (GBP), C-terminal domain. Guanylate-binding proteins (GBPs) are synthesized after activation of the cell by interferons. The biochemical properties of GBPs are clearly different from those of Ras-like and heterotrimeric GTP-binding proteins. They bind guanine nucleotides with low affinity (micromolar range), are stable in their absence, and have a high turnover GTPase. In addition to binding GDP/GTP, they have the unique ability to bind GMP with equal affinity and hydrolyze GTP not only to GDP, but also to GMP. This C-terminal domain has been shown to mediate inhibition of endothelial cell proliferation by inflammatory cytokines.

Pssm-ID: 293879 [Multi-domain] Cd Length: 291 Bit Score: 41.02 E-value: 5.02e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  616 KQQLQKQKSMEAERLK--QKEQERKI-----IELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPR-------KLHEEEK 681
Cdd:cd16269  191 QALTEKEKEIEAERAKaeAAEQERKLleeqqRELEQKLEDQERSYEEHLRQLKEKMEEERENLLKEqeralesKLKEQEA 270


                 ....*
gi 47717123  682 LKREE 686
Cdd:cd16269  271 LLEEG 275

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1 and similar proteins; This subfamily is composed of SKAP1, SKAP2, and similar proteins. SKAP1 and SKAP2 are immune cell-specific adaptor proteins that play roles in T- and B-cell adhesion, respectively, and are thus important in the migration of T- and B-cells to sites of inflammation and for movement during T-cell conjugation with antigen-presenting cells. Both SKAP1 and SKAP2 bind to ADAP (adhesion and degranulation-promoting adaptor protein), among many other binding partners. They contain a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212800 Cd Length: 53 Bit Score: 36.64 E-value: 5.09e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  919 QALYPWRAKKDNHLNFNKNDVITVLEQQ---DMWWFGEVQGQKGWFPKSYV 966
Cdd:cd11866    3 MGLWDCSGNEPDELSFKRGDLIYIISKEydsFGWWVGELNGKVGLVPKDYL 53

Protein of unknown function (DUF3584); This protein is found in bacteria and eukaryotes. Proteins in this family are typically between 943 to 1234 amino acids in length. This family contains a P-loop motif suggesting it is a nucleotide binding protein. It may be involved in replication.

Pssm-ID: 432349 [Multi-domain] Cd Length: 1191 Bit Score: 41.75 E-value: 5.40e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    490 HQLEGKLQDIRCRLTTQRQEIEsTNKSRELRI--------AEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQNSlh 561
Cdd:pfam12128  230 IQAIAGIMKIRPEFTKLQQEFN-TLESAELRLshlhfgykSDETLIASRQEERQETSAELNQLLRTLDDQWKEKRDEL-- 306

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    562 RDSLVTLKRALEAKE-----LARQHLRDQLDEVEKeTRSKLQEIDIFNNQLKELREIHnKQQLQKQKSMEAE----RLKQ 632
Cdd:pfam12128  307 NGELSAADAAVAKDRseleaLEDQHGAFLDADIET-AAADQEQLPSWQSELENLEERL-KALTGKHQDVTAKynrrRSKI 384

                          170       180       190       200       210
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123    633 KEQERKIIELEKQKEEAQRRAQER-------DKQWLEHVQQEDEHQRPRKLHEEEKL 682
Cdd:pfam12128  385 KEQNNRDIAGIKDKLAKIREARDRqlavaedDLQALESELREQLEAGKLEFNEEEYR 441

Ca2+-dependent lipid-binding protein, contains C2 domain [General function prediction only];

Pssm-ID: 227371 [Multi-domain] Cd Length: 1227 Bit Score: 41.67 E-value: 5.45e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1596 GRLMVNVVEGIELKPCRSHGKSNPYCEVTM-GSQCHITKTIQDTLNPKWNSNCQFFIRDLEQEVLCITVFERDQFSPDDF 1674
Cdd:COG5038 1040 GYLTIMLRSGENLPSSDENGYSDPFVKLFLnEKSVYKTKVVKKTLNPVWNEEFTIEVLNRVKDVLTINVNDWDSGEKNDL 1119

                         90       100
                 ....*....|....*....|....
gi 47717123 1675 LGRTEIRVADIK--KDQGSKGPVT 1696
Cdd:COG5038 1120 LGTAEIDLSKLEpgGTTNSNIPLD 1143

Uncharacterized protein, contains DUF3084 domain [Function unknown];

Pssm-ID: 443500 [Multi-domain] Cd Length: 370 Bit Score: 41.04 E-value: 5.52e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  542 IPEKQILNDQLKQVQQNSLH-RDSLVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREihNKQQLQ 620
Cdd:COG4372   37 LFELDKLQEELEQLREELEQaREELEQLEEELEQARSELEQLEEELEELNEQLQAAQAELAQAQEELESLQE--EAEELQ 114

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  621 KQ-KSMEAERlKQKEQERKiiELEKQKEEAQRRAQERDKQwLEHVQQedehqrprklhEEEKLKREESVKKKDGEEKGKQ 699
Cdd:COG4372  115 EElEELQKER-QDLEQQRK--QLEAQIAELQSEIAEREEE-LKELEE-----------QLESLQEELAALEQELQALSEA 179

                        170
                 ....*....|....*
gi 47717123  700 EAQDKLGRLFHQHQE 714
Cdd:COG4372  180 EAEQALDELLKEANR 194

recombination and DNA strand exchange inhibitor protein; Reviewed

Pssm-ID: 234750 [Multi-domain] Cd Length: 782 Bit Score: 41.35 E-value: 5.71e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   580 QHLRDQLDEVEKETRSKLQEIDIFNNQLKElreihNKQQLQKQKsmEAERLKQKEQERKIIElEKQKEEAQRRAQERDKQ 659
Cdd:PRK00409  526 EELERELEQKAEEAEALLKEAEKLKEELEE-----KKEKLQEEE--DKLLEEAEKEAQQAIK-EAKKEADEIIKELRQLQ 597

                          90       100       110
                  ....*....|....*....|....*....|....*
gi 47717123   660 WLEHVQQ-----EDEHQR---PRKLHEEEKLKREE 686
Cdd:PRK00409  598 KGGYASVkahelIEARKRlnkANEKKEKKKKKQKE 632

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 36.82 E-value: 5.72e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1080 QVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGkkrqiGWFPANYVKL 1135
Cdd:cd11928    4 KALYSYEGKEPGDLKFNKGDIIILRRKVDENWYHGELNGCH-----GFLPASYIQC 54

Weak chloroplast movement under blue light; WEMBL consists of several plant proteins required for the chloroplast avoidance response under high intensity blue light. This avoidance response consists in the relocation of chloroplasts on the anticlinal side of exposed cells. Acts in association with PMI2 to maintain the velocity of chloroplast photo-relocation movement via the regulation of cp-actin filaments. Thus several member-sequences are described as "myosin heavy chain-like".

Pssm-ID: 461718 [Multi-domain] Cd Length: 562 Bit Score: 41.17 E-value: 5.73e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    325 VDQRLPEEPVLEDEQQQLEKKLPVTFEDKKRE------NFERGN--------------LELEKRRQALLEQQRKE----- 379
Cdd:pfam05701  270 MESKLKEEADGEGNEKKTSTSIQAALASAKKEleevkaNIEKAKdevnclrvaaaslrSELEKEKAELASLRQREgmasi 349

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    380 --QERLAQLERAEQERKE-RERQEQERKRQLELEKQLEKqrelerqreeerrkeierreaAKRELERQRQLEweRNRRQE 456
Cdd:pfam05701  350 avSSLEAELNRTKSEIALvQAKEKEAREKMVELPKQLQQ---------------------AAQEAEEAKSLA--QAAREE 406

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    457 LlnqrNKEQEDIVVLKAKKKTLEFELEAlndkkhqlegklqdircrltTQRqEIESTNKSRELRIAEIthlqqqlqesqq 536
Cdd:pfam05701  407 L----RKAKEEAEQAKAAASTVESRLEA--------------------VLK-EIEAAKASEKLALAAI------------ 449

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    537 mlgrlipeKQILNDQLKQVQQNSLHRDSLVTL---------KRALEAKELARQHLRDQLDEVE--KETRSKLQEidifnn 605
Cdd:pfam05701  450 --------KALQESESSAESTNQEDSPRGVTLsleeyyelsKRAHEAEELANKRVAEAVSQIEeaKESELRSLE------ 515

                          330       340       350       360       370
                   ....*....|....*....|....*....|....*....|....*....|..
gi 47717123    606 QLKEL-REIHNKQQLQKQKSMEAERLKQ----KEQerkiiELEKQKEEAQRR 652
Cdd:pfam05701  516 KLEEVnREMEERKEALKIALEKAEKAKEgklaAEQ-----ELRKWRAEHEQR 562

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 2; Shank2, also called ProSAP1 (Proline-rich synapse-associated protein 1) or CortBP1 (Cortactin-binding protein 1), is found in neurons, glia, endocrine cells, liver, and kidney. It plays a role in regulating dendritic spine volume and branching and postsynaptic clustering. Mutations in the Shank2 gene are associated with autism spectrum disorder and mental retardation. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212916 Cd Length: 52 Bit Score: 36.44 E-value: 5.80e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 47717123 1081 VIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGelQARGkkrQIGWFPANYV 1133
Cdd:cd11983    5 VVKSYQPQVEGEIPLHKGDRVKVLSIGEGGFWEG--SARG---HVGWFPAECV 52

TolA protein; TolA couples the inner membrane complex of itself with TolQ and TolR to the outer membrane complex of TolB and OprL (also called Pal). Most of the length of the protein consists of low-complexity sequence that may differ in both length and composition from one species to another, complicating efforts to discriminate TolA (the most divergent gene in the tol-pal system) from paralogs such as TonB. Selection of members of the seed alignment and criteria for setting scoring cutoffs are based largely conserved operon struction. //The Tol-Pal complex is required for maintaining outer membrane integrity. Also involved in transport (uptake) of colicins and filamentous DNA, and implicated in pathogenesis. Transport is energized by the proton motive force. TolA is an inner membrane protein that interacts with periplasmic TolB and with outer membrane porins ompC, phoE and lamB. [Transport and binding proteins, Other, Cellular processes, Pathogenesis]

Pssm-ID: 274303 [Multi-domain] Cd Length: 346 Bit Score: 40.98 E-value: 5.84e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    574 AKELARQHLRDQLDEVEKETRSKLQEIDIFNNQLKELREIH-NKQQLQKQKSMEAERLKQKEQERKIIEL-EKQKEEAQR 651
Cdd:TIGR02794   47 AVAQQANRIQQQKKPAAKKEQERQKKLEQQAEEAEKQRAAEqARQKELEQRAAAEKAAKQAEQAAKQAEEkQKQAEEAKA 126

                           90       100       110       120       130       140
                   ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 47717123    652 RA---------QERDKQWLEHVQQEDEHQRPRKLHEEEKLKREESVKKKDGEEKGKQEAQDK 704
Cdd:TIGR02794  127 KQaaeakakaeAEAERKAKEEAAKQAEEEAKAKAAAEAKKKAEEAKKKAEAEAKAKAEAEAK 188

First Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The first SH3 domain of Nck2 binds the PxxDY sequence in the CD3e cytoplasmic tail; this binding inhibits phosphorylation by Src kinases, resulting in the downregulation of TCR surface expression. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212832 [Multi-domain] Cd Length: 58 Bit Score: 36.65 E-value: 5.93e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1160 VIGMYDYTAQNDDELAFNKGQIINVLNkEDPDWWK-GEVNGQVGLFPSNYVK 1210
Cdd:cd11899    6 VIAKWDYTAQQDQELDIKKNERLWLLD-DSKTWWRvRNAANRTGYVPSNYVE 56

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF16 and ARHGEF26; ARHGEF16, also called ephexin-4, acts as a GEF for RhoG, activating it by exchanging bound GDP for free GTP. RhoG is a small GTPase that is a crucial regulator of Rac in migrating cells. ARHGEF16 interacts directly with the ephrin receptor EphA2 and mediates cell migration and invasion in breast cancer cells by activating RhoG. ARHGEF26, also called SGEF (SH3 domain-containing guanine exchange factor), also activates RhoG. It is highly expressed in liver and may play a role in regulating membrane dynamics. ARHGEF16 and ARHGEF26 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212871 Cd Length: 55 Bit Score: 36.75 E-value: 5.95e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  751 FESRSHDEITIQPGDIVMVkgewvdeSQTGEPGWLGGEL--KGKTGWFPANYAE 802
Cdd:cd11938    8 YTAKQPDELSLQQADVVLV-------LQTESDGWYYGERlrDGERGWFPSSCAK 54

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Embryonal Fyn-associated Substrate; EFS is also called HEFS, CASS3 (Cas scaffolding protein family member 3) or SIN (Src-interacting protein). It was identified based on interactions with the Src kinases, Fyn and Yes. It plays a role in thymocyte development and acts as a negative regulator of T cell proliferation. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212936 Cd Length: 62 Bit Score: 36.79 E-value: 6.01e-03

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVkgewVDESQTGEPGWLGGELKGKTGWFPANYAEKIPE 806
Cdd:cd12003    4 KALYDNAAESPEELSFRRGDVLMV----LKREHGSLPGWWLCSLHGQQGIAPANRLRLLPT 60

Third Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212750 [Multi-domain] Cd Length: 51 Bit Score: 36.62 E-value: 6.12e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*...
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQ-QDMWWFGEVQGQKGWFPKSYV 966
Cdd:cd11816    4 ARFDFEGEQEDELSFSEGDVITLKEYvGEEWAKGELNGKIGIFPLNFV 51

Src homology 3 domain of Lyn Protein Tyrosine Kinase; Lyn is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lyn is expressed in B lymphocytes and myeloid cells. It exhibits both positive and negative regulatory roles in B cell receptor (BCR) signaling. Lyn, as well as Fyn and Blk, promotes B cell activation by phosphorylating ITAMs (immunoreceptor tyr activation motifs) in CD19 and in Ig components of BCR. It negatively regulates signaling by its unique ability to phosphorylate ITIMs (immunoreceptor tyr inhibition motifs) in cell surface receptors like CD22 and CD5. Lyn also plays an important role in G-CSF receptor signaling by phosphorylating a variety of adaptor molecules. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212937 [Multi-domain] Cd Length: 56 Bit Score: 36.51 E-value: 6.26e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGE--VQGQKGWFPKSYV 966
Cdd:cd12004    4 ALYPYDGIHEDDLSFKKGEKLKVIEEHGEWWKARslTTKKEGFIPSNYV 52

Fourth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212751 [Multi-domain] Cd Length: 50 Bit Score: 36.30 E-value: 6.26e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVKgEWVDESqtgepgWLGGELKGKTGWFPANY 800
Cdd:cd11817    4 ALYDFTGETEEDLSFQRGDRILVT-EHLDAE------WSRGRLNGREGIFPRAF 50

Coiled-coil domain-containing protein 158; CCDC158 is a family of proteins found in eukaryotes. The function is not known.

Pssm-ID: 464943 [Multi-domain] Cd Length: 1112 Bit Score: 41.64 E-value: 6.27e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    338 EQQQLEKKLPVTFEDKKREN--FERGNLELE----KRRQALLEQQRKEQERLAQLER----AEQE----RKERERQEQER 403
Cdd:pfam15921  293 QANSIQSQLEIIQEQARNQNsmYMRQLSDLEstvsQLRSELREAKRMYEDKIEELEKqlvlANSElteaRTERDQFSQES 372

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    404 KrqlELEKQLEKqrelerqreeerrkeierREAAKRELERQRQLEWERNRRQELLNQRNKEQEDivvlkakkkTLEFELE 483
Cdd:pfam15921  373 G---NLDDQLQK------------------LLADLHKREKELSLEKEQNKRLWDRDTGNSITID---------HLRRELD 422

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    484 ALNDKKHQLEGKLQDIR--CRLTTQRQ--EIESTNKSRElRIAEIThlqQQLQESQQMLGRLIPE----KQILNDQLKQV 555
Cdd:pfam15921  423 DRNMEVQRLEALLKAMKseCQGQMERQmaAIQGKNESLE-KVSSLT---AQLESTKEMLRKVVEEltakKMTLESSERTV 498

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    556 QQNSLhrdSLVTLKRALEAKELARQHLRDQLDeveketrSKLQEIDIFNNQLKELREIhnkqqlqkQKSMEAERLKQKEQ 635
Cdd:pfam15921  499 SDLTA---SLQEKERAIEATNAEITKLRSRVD-------LKLQELQHLKNEGDHLRNV--------QTECEALKLQMAEK 560

                          330
                   ....*....|...
gi 47717123    636 ErKIIELEKQKEE 648
Cdd:pfam15921  561 D-KVIEILRQQIE 572

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 36.47 E-value: 6.29e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123  747 ALYPFESRSHDEITIQPGDIVMVKGEwvdesqtGEPGWLGGELKGKTGWFPANYAE 802
Cdd:cd11995    5 GMYDYTAQNDDELAFSKGQIINVLNK-------EDPDWWKGELNGQVGLFPSNYVK 53

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF5 and ARHGEF19; ARHGEF5, also called ephexin-3 or TIM (Transforming immortalized mammary oncogene), is a potent activator of RhoA and it plays roles in regulating cell shape, adhesion, and migration. It binds to the SH3 domain of Src and is involved in regulating Src-induced podosome formation. ARHGEF19, also called ephexin-2 or WGEF (weak-similarity GEF), is highly expressed in the intestine, liver, heart and kidney. It activates RhoA, Cdc42, and Rac 1, and has been shown to activate RhoA in the Wnt-PCP (planar cell polarity) pathway. It is involved in the regulation of cell polarity and cytoskeletal reorganization. ARHGEF5 and ARHGEF19 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212873 Cd Length: 55 Bit Score: 36.69 E-value: 6.35e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 47717123  751 FESRSHDEITIQPGDIVMVKgewvdesQTGEPGWLGGEL--KGKTGWFPANYAE 802
Cdd:cd11940    8 YKAQENDELTLEKADIIMVR-------QQSSDGWLEGVRlsDGERGWFPQSHVE 54

Coiled-coil domain-containing protein 66; This protein family, named Coiled-coil domain-containing protein 66 (CCDC) refers to a protein domain found in eukaryotes, and is approximately 160 amino acids in length. CCDC66 protein is detected mainly in the inner segments of photoreceptors in many vertebrates including mice and humans. It has been found in dogs, that a mutation in the CCDC66 gene causes generalized progressive retinal atrophy (gPRA). This shows that the protein encoded for by this gene is vital for healthy vision and guards against photoreceptor cell degeneration. The structure of CCDC66 proteins includes a heptad repeat pattern which contains at least one coiled-coil domain. There are at least two or more alpha-helices which form a cable-like structure.

Pssm-ID: 434558 [Multi-domain] Cd Length: 154 Bit Score: 39.01 E-value: 6.50e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    340 QQLEKKLPVTFEDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAE----------------QERKERERQEQeR 403
Cdd:pfam15236   63 KQLEEKERQKKLEEERRRQEEQEEEERLRREREEEQKQFEEERRKQKEKEEamtrktqallqamqkaQELAQRLKQEQ-R 141


                   ....*
gi 47717123    404 KRQLE 408
Cdd:pfam15236  142 IRELA 146

Third Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the third SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212950 Cd Length: 53 Bit Score: 36.28 E-value: 6.55e-03

                         10        20        30
                 ....*....|....*....|....*....|....*.
gi 47717123  932 LNFNKNDVITVLEQQ-DMWWFGEVQGQKGWFPKSYV 966
Cdd:cd12017   16 ISFQKGQKVEVIDKNpSGWWYVKIDGKEGWAPSSYI 51

Guanylate-binding protein, C-terminal domain; Guanylate-binding protein (GBP), C-terminal domain. Guanylate-binding proteins (GBPs) are synthesized after activation of the cell by interferons. The biochemical properties of GBPs are clearly different from those of Ras-like and heterotrimeric GTP-binding proteins. They bind guanine nucleotides with low affinity (micromolar range), are stable in their absence, and have a high turnover GTPase. In addition to binding GDP/GTP, they have the unique ability to bind GMP with equal affinity and hydrolyze GTP not only to GDP, but also to GMP. This C-terminal domain has been shown to mediate inhibition of endothelial cell proliferation by inflammatory cytokines.

Pssm-ID: 293879 [Multi-domain] Cd Length: 291 Bit Score: 40.64 E-value: 6.89e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  363 LELEKRRQALLEQQRKEQERlaQLERAEQERKERERQEQERKRQLEleKQLEKqrelerqreeerrkeierreaakrelE 442
Cdd:cd16269  200 IEAERAKAEAAEQERKLLEE--QQRELEQKLEDQERSYEEHLRQLK--EKMEE--------------------------E 249

                         90       100       110       120       130
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  443 RQRQLEwernRRQELLNQRNKEQEdivvlKAKKKTLEFELEALNDKKHQLE 493
Cdd:cd16269  250 RENLLK----EQERALESKLKEQE-----ALLEEGFKEQAELLQEEIRSLK 291

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1 and similar proteins; This subfamily is composed of SKAP1, SKAP2, and similar proteins. SKAP1 and SKAP2 are immune cell-specific adaptor proteins that play roles in T- and B-cell adhesion, respectively, and are thus important in the migration of T- and B-cells to sites of inflammation and for movement during T-cell conjugation with antigen-presenting cells. Both SKAP1 and SKAP2 bind to ADAP (adhesion and degranulation-promoting adaptor protein), among many other binding partners. They contain a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212800 Cd Length: 53 Bit Score: 36.26 E-value: 6.92e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTKKDGD---WWTGTVGDKAGVFPSNYV 1055
Cdd:cd11866    2 YMGLWDCSGNEPDELSFKRGDLIYIISKEYDsfgWWVGELNGKVGLVPKDYL 53

Uncharacterized coiled-coil protein, contains DUF342 domain [Function unknown];

Pssm-ID: 440951 [Multi-domain] Cd Length: 297 Bit Score: 40.66 E-value: 6.98e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  364 ELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQL--ELEKQLEKqrelerqreeerrkeierreaaKREL 441
Cdd:COG1340   12 ELEEKIEELREEIEELKEKRDELNEELKELAEKRDELNAQVKELreEAQELREK----------------------RDEL 69

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  442 -ERQRQLeweRNRRQELLNQRNKEQEDIVVLKAKKKT-----------------LEFELE--ALN-DKKHQLEGKLQDIR 500
Cdd:COG1340   70 nEKVKEL---KEERDELNEKLNELREELDELRKELAElnkaggsidklrkeierLEWRQQteVLSpEEEKELVEKIKELE 146

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  501 CRLTTQRQEIESTNKSRELRiAEITHLQQQLQESQQMLGRLIPEKQILNDQLKQVQQnslHRDSLVtlKRALEAKELARQ 580
Cdd:COG1340  147 KELEKAKKALEKNEKLKELR-AELKELRKEAEEIHKKIKELAEEAQELHEEMIELYK---EADELR--KEADELHKEIVE 220

                        250       260       270       280       290       300
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 47717123  581 ------HLRDQLDEVEKETRSKLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQ 635
Cdd:COG1340  221 aqekadELHEEIIELQKELRELRKELKKLRKKQRALKREKEKEELEEKAEEIFEKLKKGEK 281

Third Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212858 Cd Length: 57 Bit Score: 36.51 E-value: 7.00e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1007 FIAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGTV--GDKAGVFPSNYV 1055
Cdd:cd11925    3 YLALYAYKPQKNDELELRKGEMYRVIEKCQDgWFKGTSlrTGVSGVFPGNYV 54

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 36.54 E-value: 7.04e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDVILVTKKDGD-WWTGT-VGD-KAGVFPSNYVR 1056
Cdd:cd11793    3 QCVHAYTAQQPDELTLEEGDVVNVLRKMPDgWYEGErLRDgERGWFPSSYTE 54

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 36.48 E-value: 7.06e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123 1080 QVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGkkrqiGWFPANYVKLL 1136
Cdd:cd12054    4 KVLFEYVPQNEDELELKVGDIIDINEEVEEGWWSGTLNGKS-----GLFPSNFVKEL 55

Caldesmon;

Pssm-ID: 460421 [Multi-domain] Cd Length: 495 Bit Score: 41.01 E-value: 7.07e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    331 EEPVLEDEQQQLEKKLPV-TFEDKKR----------ENFERGNLELEKRRQALLEQ-QRKEQERLAQ------LERAEQE 392
Cdd:pfam02029  177 EEVKDEKIKKEKKVKYESkVFLDQKRghpevksqngEEEVTKLKVTTKRRQGGLSQsQEREEEAEVFleaeqkLEELRRR 256

                           90       100       110       120       130       140       150
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 47717123    393 RKERERQEQERKRQLELEKQLEKQRELErqreeerrkeierreaaKRELERQRQLEWERNRRQELLNQRNKEQED 467
Cdd:pfam02029  257 RQEKESEEFEKLRQKQQEAELELEELKK-----------------KREERRKLLEEEEQRRKQEEAERKLREEEE 314

Src homology 3 domain of DBL's Big Sister (DBS), a guanine nucleotide exchange factor; DBS, also called MCF2L (MCF2-transforming sequence-like protein) or OST, is a Rho GTPase guanine nucleotide exchange factor (RhoGEF), facilitating the exchange of GDP and GTP. It was originally isolated from a cDNA screen for sequences that cause malignant growth. It plays roles in regulating clathrin-mediated endocytosis and cell migration through its activation of Rac1 and Cdc42. Depending on cell type, DBS can also activate RhoA and RhoG. DBS contains a Sec14-like domain, spectrin-like repeats, a RhoGEF [or Dbl homology (DH)] domain, a Pleckstrin homology (PH) domain, and an SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212791 Cd Length: 55 Bit Score: 36.50 E-value: 7.15e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVKGEwvdesqtGEPG-WLGGEL-KGKTGWFPAN 799
Cdd:cd11857    2 YTVVADYEKGGPDDLTVKSGDLVQLIHE-------GDEGqWLVKNLsTRKEGWVPAA 51

Trichohyalin-plectin-homology domain; This family is a mixtrue of two different families of eukaryotic proteins. Trichoplein or mitostatin, was first defined as a meiosis-specific nuclear structural protein. It has since been linked with mitochondrial movement. It is associated with the mitochondrial outer membrane, and over-expression leads to reduction in mitochondrial motility whereas lack of it enhances mitochondrial movement. The activity appears to be mediated through binding the mitochondria to the actin intermediate filaments (IFs). The family is in the trichohyalin-plectin-homology domain.

Pssm-ID: 464007 [Multi-domain] Cd Length: 341 Bit Score: 40.67 E-value: 7.16e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    436 AAKRELERQRQLEwERNRRQELLNQRNKEQEDIVvLKAKKKTLEFELEALNDKKHQLEGKLQDIRCRLTTQRQEiestnK 515
Cdd:pfam13868   17 AAKCNKERDAQIA-EKKRIKAEEKEEERRLDEMM-EEERERALEEEEEKEEERKEERKRYRQELEEQIEEREQK-----R 89

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    516 SRELRIAEIthlqqqlqesqqmlgrlipEKQILNDQLKQVQQNSLhrdslvtlkRALEAKELARQHLRDQLDEVEKETRS 595
Cdd:pfam13868   90 QEEYEEKLQ-------------------EREQMDEIVERIQEEDQ---------AEAEEKLEKQRQLREEIDEFNEEQAE 141

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    596 -KLQEIDIFNNQLKELREIHNKQQLQKQKSMEAERLKQKEQERKIIELEKQKEEAQRRAQERDKQWLEHVQ--------- 665
Cdd:pfam13868  142 wKELEKEEEREEDERILEYLKEKAEREEEREAEREEIEEEKEREIARLRAQQEKAQDEKAERDELRAKLYQeeqerkerq 221

                          250       260
                   ....*....|....*....|....*.
gi 47717123    666 -----QEDEHQRPRKLHEEEKLKREE 686
Cdd:pfam13868  222 kereeAEKKARQRQELQQAREEQIEL 247

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 36.29 E-value: 7.28e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|...
gi 47717123 1092 QLTLAPGQLILIRKKNPGGWWEGELQargkkRQIGWFPANYVK 1134
Cdd:cd11820   16 ELTFKAGEIITVLDDSDPNWWKGSNH-----RGEGLFPANFVT 53

Src Homology 3 domain of Amphiphysin I; Amphiphysins function primarily in endocytosis and other membrane remodeling events. They exist in several isoforms and mammals possess two amphiphysin proteins from distinct genes. Amphiphysin I proteins, enriched in the brain and nervous system, contain domains that bind clathrin, Adaptor Protein complex 2 (AP2), dynamin, and synaptojanin. They function in synaptic vesicle endocytosis. Human autoantibodies to amphiphysin I hinder GABAergic signaling and contribute to the pathogenesis of paraneoplastic stiff-person syndrome. Amphiphysins contain an N-terminal BAR domain with an additional N-terminal amphipathic helix (an N-BAR), a variable central domain, and a C-terminal SH3 domain. The SH3 domain of amphiphysins bind proline-rich motifs present in binding partners such as dynamin, synaptojanin, and nsP3. It also belongs to a subset of SH3 domains that bind ubiquitin in a site that overlaps with the peptide binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213016 Cd Length: 72 Bit Score: 36.80 E-value: 7.64e-03

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 47717123  748 LYPFESRSHDEITIQPGDIVMVKGEWVDESQtgEPGWLGG----------ELKGKTGWFPANYAEKI 804
Cdd:cd12140    8 LHDFEAANSDELELKRGDIVLVVPSETAADQ--DAGWLTGvkesdwlqyrDASAYKGLFPENFTRRL 72

Mitotic checkpoint protein; This family consists of several eukaryotic mitotic checkpoint (Mitotic arrest deficient or MAD) proteins. The mitotic spindle checkpoint monitors proper attachment of the bipolar spindle to the kinetochores of aligned sister chromatids and causes a cell cycle arrest in prometaphase when failures occur. Multiple components of the mitotic spindle checkpoint have been identified in yeast and higher eukaryotes. In S.cerevisiae, the existence of a Mad1-dependent complex containing Mad2, Mad3, Bub3 and Cdc20 has been demonstrated.

Pssm-ID: 461677 [Multi-domain] Cd Length: 660 Bit Score: 40.88 E-value: 7.95e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    403 RKRQLELEKQLEKqrelerqREEERRKEIERREAAKRELERQ-----RQLEWERNRRQELL-----------NQRNKEQE 466
Cdd:pfam05557    1 RAELIESKARLSQ-------LQNEKKQMELEHKRARIELEKKasalkRQLDRESDRNQELQkrirllekreaEAEEALRE 73

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    467 DIVVLKAKKKTLEFELEALNDKkhqlEGKLQDIRCRLTTQRQEIestnksREL-RIAEITHLQQQlqesqqmlgRLIPEK 545
Cdd:pfam05557   74 QAELNRLKKKYLEALNKKLNEK----ESQLADAREVISCLKNEL------SELrRQIQRAELELQ---------STNSEL 134

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    546 QILNDQLKQVQqnslhrdslvtlKRALEAKELARQHlrdqldeveketRSKLQEIDIFNNQLKELrEIHNKQQLQKQ--- 622
Cdd:pfam05557  135 EELQERLDLLK------------AKASEAEQLRQNL------------EKQQSSLAEAEQRIKEL-EFEIQSQEQDSeiv 189

                          250       260       270       280       290       300
                   ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 47717123    623 KSMEAERLKQKEQERkiiELEKQKEE-AQRRAQERDKQWLEhvqqEDEHQRPRKLHEEEKLKRE 685
Cdd:pfam05557  190 KNSKSELARIPELEK---ELERLREHnKHLNENIENKLLLK----EEVEDLKRKLEREEKYREE 246

Src Homology 3 domain of Bbc1 and similar domains; This subfamily is composed of Saccharomyces cerevisiae Bbc1p, also called Mti1p (Myosin tail region-interacting protein), and similar proteins. Bbc1p interacts with and regulates type I myosins in yeast, Myo3p and Myo5p, which are involved in actin cytoskeletal reorganization. It also binds and inhibits Las17, a WASp family protein that functions as an activator of the Arp2/3 complex. Bbc1p contains an N-terminal SH3 domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212820 [Multi-domain] Cd Length: 60 Bit Score: 36.55 E-value: 8.05e-03

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|...
gi 47717123  746 RALYPFESRSHDEITIQPGDIVMVKGEwVDESqtgepgWLGGELKG-----KTGWFPANYAEK 803
Cdd:cd11887    5 KALYPYESDHEDDLNFDVGQLITVTEE-EDAD------WYFGEYVDsngntKEGIFPKNFVEV 60

C2 domain present in E3 ubiquitin ligase; E3 ubiquitin ligase is part of the ubiquitylation mechanism responsible for controlling surface expression of membrane proteins. The sequential action of several enzymes are involved: ubiquitin-activating enzyme E1, ubiquitin-conjugating enzyme E2, and ubiquitin-protein ligase E3 which is responsible for substrate recognition and promoting the transfer of ubiquitin to the target protein. E3 ubiquitin ligase is composed of an N-terminal C2 domain, 4 WW domains, and a HECTc domain. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 175988 [Multi-domain] Cd Length: 125 Bit Score: 38.03 E-value: 8.07e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1603 VEGIELKPCRSHGKSNPYCEVTMGSQcHITKT--IQDTLNPKWNSncQFFIRDLEQEVLCITVFERDQFSPDDFLGRTEI 1680
Cdd:cd04021    8 VESAKLKSNSKSFKPDPYVEVTVDGQ-PPKKTevSKKTSNPKWNE--HFTVLVTPQSTLEFKVWSHHTLKADVLLGEASL 84

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|....*..
gi 47717123 1681 RVADI-KKDQGskgpvtKC----LLLH--------EVPTGEIVVRLD 1714
Cdd:cd04021   85 DLSDIlKNHNG------KLenvkLTLNlssenkgsSVKVGELTVILD 125

ribonuclease Y;

Pssm-ID: 178867 [Multi-domain] Cd Length: 535 Bit Score: 41.01 E-value: 8.09e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123   558 NSLHRDSLVTLKRAL-EAKELARQHLrdqlDEVEKETRSKLQEIDIFNNQLKEL--------REIHNKQQL--QKQKSME 626
Cdd:PRK00106   60 KTAKRESKALKKELLlEAKEEARKYR----EEIEQEFKSERQELKQIESRLTERatsldrkdENLSSKEKTleSKEQSLT 135

                          90       100
                  ....*....|....*....|....*.
gi 47717123   627 AERLKQKEQERKIIELEKQKEEAQRR 652
Cdd:PRK00106  136 DKSKHIDEREEQVEKLEEQKKAELER 161

Third Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. The third SH3 domain of Sla1p can bind ubiquitin while retaining the ability to bind proline-rich ligands; monoubiquitination of target proteins signals internalization and sorting through the endocytic pathway. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212709 [Multi-domain] Cd Length: 57 Bit Score: 36.14 E-value: 8.12e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*...
gi 47717123 1008 IAMYTYESSEQGDLTFQQGDV--ILVTKKDGDWW------TGtvgdKAGVFPSNYVRL 1057
Cdd:cd11775    4 KVLYDFDAQSDDELTVKEGDVvyILDDKKSKDWWmvenvsTG----KEGVVPASYIEI 57

First Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212852 [Multi-domain] Cd Length: 55 Bit Score: 36.09 E-value: 8.37e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 47717123 1009 AMYTYESSEQGDLTFQQGDVILVTKK-DGDWWTGTVGDKAGVFPSNYVRL 1057
Cdd:cd11919    5 AKFDFKAQTLKELPLQKGDIVYIYKQiDQNWYEGEHHGRVGIFPRSYIEL 54

Src homology 3 domain of Lck Protein Tyrosine Kinase; Lck is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lck is expressed in T-cells and natural killer cells. It plays a critical role in T-cell maturation, activation, and T-cell receptor (TCR) signaling. Lck phosphorylates ITAM (immunoreceptor tyr activation motif) sequences on several subunits of TCRs, leading to the activation of different second messenger cascades. Phosphorylated ITAMs serve as binding sites for other signaling factor such as Syk and ZAP-70, leading to their activation and propagation of downstream events. In addition, Lck regulates drug-induced apoptosis by interfering with the mitochondrial death pathway. The apototic role of Lck is independent of its primary function in T-cell signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212938 [Multi-domain] Cd Length: 54 Bit Score: 35.96 E-value: 8.64e-03

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*....
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGE--VQGQKGWFPKSYV 966
Cdd:cd12005    4 ALYSYEPSHDGDLGFEKGEKLRILEQSGEWWKAQslTTGQEGFIPFNFV 52

Src homology 3 domain of Abl Interactor 1; Abi1, also called e3B1, is a central regulator of actin cytoskeletal reorganization through interactions with many protein complexes. It is part of WAVE, a nucleation-promoting factor complex, that links Rac 1 activation to actin polymerization causing lamellipodia protrusion at the plasma membrane. Abi1 interact with formins to promote protrusions at the leading edge of motile cells. It also is a target of alpha4 integrin, regulating membrane protrusions at sites of integrin engagement. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212904 [Multi-domain] Cd Length: 59 Bit Score: 36.15 E-value: 8.65e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 47717123  920 ALYPWRAKKDNHLNFNKNDVITVLEQQDMWWF-GEVQGQKGWFPKSYVKLI 969
Cdd:cd11971    4 AIYDYSKDKDDELSFMEGAIIYVIKKNDDGWYeGVCNGVTGLFPGNYVESI 54

Third N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212730 Cd Length: 51 Bit Score: 35.79 E-value: 9.50e-03

                         10        20        30
                 ....*....|....*....|....*....|....*..
gi 47717123 1020 DLTFQQGDVILVTK-KDGDWWTGTVGDKAGVFPSNYV 1055
Cdd:cd11796   15 ELDLREGDVVTITGiLDKGWFRGELNGRRGIFPEGFV 51

ATP-dependent Clp protease, ATP-binding subunit ClpA [Posttranslational modification, protein turnover, chaperones];

Pssm-ID: 440308 [Multi-domain] Cd Length: 836 Bit Score: 40.84 E-value: 9.54e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  565 LVTLKRALEAKELARQHLRDQLDEVEKETRSKLQEidifnnQLKELRE----IHNKQQLQKQKSMEAERLKQK--EQERK 638
Cdd:COG0542  413 LDELERRLEQLEIEKEALKKEQDEASFERLAELRD------ELAELEEeleaLKARWEAEKELIEEIQELKEEleQRYGK 486

                         90       100       110
                 ....*....|....*....|....*....|
gi 47717123  639 IIELEKQKEEAQRRAQERDKQWLEHVQQED 668
Cdd:COG0542  487 IPELEKELAELEEELAELAPLLREEVTEED 516

Second Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the second SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212949 Cd Length: 54 Bit Score: 35.90 E-value: 9.65e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 47717123  745 YRALYPFESRSHDEITIQPGDIVMVKGEWVDesqtgepGWLGGELKGKTGWFPANYAEK 803
Cdd:cd12016    3 YITTQAYKAENEDEIGFETGVVVEVIQKNLD-------GWWKIRYQGKEGWAPATYLKK 54

Outer membrane protein (OmpH-like); This family includes outer membrane proteins such as OmpH among others. Skp (OmpH) has been characterized as a molecular chaperone that interacts with unfolded proteins as they emerge in the periplasm from the Sec translocation machinery.

Pssm-ID: 461098 [Multi-domain] Cd Length: 140 Bit Score: 38.33 E-value: 9.65e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123    335 LEDEQQQLEKKLpvtfeDKKRENFERGNLELEKRRQALLEQQRKEQERLAQLERAEQERKERERQEQERKRQLELEKQLE 414
Cdd:pfam03938   24 LEKKFKKRQAEL-----EAKQKELQKLYEELQKDGALLEEEREEKEQELQKKEQELQQLQQKAQQELQKKQQELLQPIQD 98


                   .
gi 47717123    415 K 415
Cdd:pfam03938   99 K 99

C2 domain first repeat present in RasA1 and RasA4; Rasal1 and RasA4 are both members of GAP1 (GTPase activating protein 1). Rasal1 responds to repetitive Ca2+ signals by associating with the plasma membrane and deactivating Ras. RasA4 suppresses Ras function by enhancing the GTPase activity of Ras proteins resulting in the inactive GDP-bound form of Ras. In this way it can control cellular proliferation and differentiation. Both of these proteins contains two C2 domains, a Ras-GAP domain, a plextrin homology (PH)-like domain, and a Bruton's Tyrosine Kinase (BTK) zinc binding domain. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176018 [Multi-domain] Cd Length: 121 Bit Score: 37.88 E-value: 9.68e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123 1598 LMVNVVEGIELKPCRSHGKSNPYCEVTMGSQCHI-TKTIQDTLNPKWNSNCQFFIrDLEQEVLCITVFERDQFSPDDFLG 1676
Cdd:cd04054    2 LYIRIVEGKNLPAKDITGSSDPYCIVKVDNEVIIrTATVWKTLNPFWGEEYTVHL-PPGFHTVSFYVLDEDTLSRDDVIG 80


                 ....
gi 47717123 1677 RTEI 1680
Cdd:cd04054   81 KVSL 84

Uncharacterized conserved protein YhaN, contains AAA domain [Function unknown];

Pssm-ID: 443752 [Multi-domain] Cd Length: 641 Bit Score: 40.52 E-value: 9.98e-03

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  540 RLIPEKQILNDQLKQVQQNslhRDSLVTLKRALEAKELARQHLRDQLDEVEK---------ETRSKLQEIDIFNNQLKEL 610
Cdd:COG4717   75 ELEEELKEAEEKEEEYAEL---QEELEELEEELEELEAELEELREELEKLEKllqllplyqELEALEAELAELPERLEEL 151

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 47717123  611 REihnkqqlqkqksmEAERLKQKEQ-----ERKIIELEKQKEEAQRRAQERDKQWLEHVQQEDEHQRPRKLHEEEKLKRE 685
Cdd:COG4717  152 EE-------------RLEELRELEEeleelEAELAELQEELEELLEQLSLATEEELQDLAEELEELQQRLAELEEELEEA 218


                 .
gi 47717123  686 E 686
Cdd:COG4717  219 Q 219

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 36.07 E-value: 9.98e-03

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 47717123 1079 AQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARgkkrqIGWFPANYVK 1134
Cdd:cd11805    2 VQALYDFNPQEPGELEFRRGDIITVLDSSDPDWWKGELRGR-----VGIFPANYVQ 52