Pleckstrin homology domain-containing family G members 1, 2, and 3 pleckstrin homology (PH) domain; PLEKHG1 (also called ARHGEF41), PLEKHG2 (also called ARHGEF42 or CLG/common-site lymphoma/leukemia guanine nucleotide exchange factor2), and PLEKHG3 (also called ARHGEF43) have RhoGEF DH/double-homology domains in tandem with a PH domain which is involved in phospholipid binding. They function as a guanine nucleotide exchange factor (GEF) and are involved in the regulation of Rho protein signal transduction. Mutations in PLEKHG1 have been associated panic disorder (PD), an anxiety disorder characterized by panic attacks and anticipatory anxiety. 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.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502  253 EVVEDAIDTMTCVAWYINDMKRRHEHAVRLQEIQSLLINWKGPDLTTYGELVLEATFRVHRVRNDRTFFLFDKILLITKK 332
Cdd:cd13243     2 SVVEEALDTMTQVAWHINDMKRKHEHAVRVQEIQSLLDGWEGPELTTYGDLVLEGTFRMAGAKNERLLFLFDKMLLITKK 81

                          90       100       110       120       130       140
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 167621502  333 RGDH-FVYKGHIPCSSLMLIES-TRDSLCFTVTHYKHSKQQYSIQAKTVEEKRSWTHHIKRLILEN 396
Cdd:cd13243    82 REDGiLQYKTHIMCSNLMLSESiPKEPLSFQVLPFDNPKLQYTLQAKNQEQKRLWTQEIKRLILEN 147

Pleckstrin homology domain-containing family G members 1, 2, and 3 pleckstrin homology (PH) domain; PLEKHG1 (also called ARHGEF41), PLEKHG2 (also called ARHGEF42 or CLG/common-site lymphoma/leukemia guanine nucleotide exchange factor2), and PLEKHG3 (also called ARHGEF43) have RhoGEF DH/double-homology domains in tandem with a PH domain which is involved in phospholipid binding. They function as a guanine nucleotide exchange factor (GEF) and are involved in the regulation of Rho protein signal transduction. Mutations in PLEKHG1 have been associated panic disorder (PD), an anxiety disorder characterized by panic attacks and anticipatory anxiety. 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.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502  253 EVVEDAIDTMTCVAWYINDMKRRHEHAVRLQEIQSLLINWKGPDLTTYGELVLEATFRVHRVRNDRTFFLFDKILLITKK 332
Cdd:cd13243     2 SVVEEALDTMTQVAWHINDMKRKHEHAVRVQEIQSLLDGWEGPELTTYGDLVLEGTFRMAGAKNERLLFLFDKMLLITKK 81

                          90       100       110       120       130       140
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 167621502  333 RGDH-FVYKGHIPCSSLMLIES-TRDSLCFTVTHYKHSKQQYSIQAKTVEEKRSWTHHIKRLILEN 396
Cdd:cd13243    82 REDGiLQYKTHIMCSNLMLSESiPKEPLSFQVLPFDNPKLQYTLQAKNQEQKRLWTQEIKRLILEN 147

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.

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502     97 VVREIVETERMYVQDLRSIVEDYLLKIIDTPGLLKPEQVSALFGNIESIYALNSQLLRDLDSC----NSDPVAVASCFVE 172
Cdd:smart00325    1 VLKELLQTERNYVRDLKLLVEVFLKPLKKELKLLSPNELETLFGNIEEIYEFHRDFLDELEERieewDDSVERIGDVFLK 80

                            90       100       110       120       130       140       150       160
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502    173 RSQEFDIYTQYCNNYPNSVAALTECMQDKQQAKFFRDRQELLQH-SLPLGSYLLKPVQRVLKYHLLLQEIAKHFDEEEDG 251
Cdd:smart00325   81 LEEFFKIYSEYCSNHPDALELLKKLKKNPRFQKFLKEIESSPQCrRLTLESLLLKPVQRLTKYPLLLKELLKHTPEDHED 160

                           170       180
                    ....*....|....*....|
gi 167621502    252 FEVVEDAIDTMTCVAWYIND 271
Cdd:smart00325  161 REDLKKALKAIKELANQVNE 180

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

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502   97 VVREIVETERMYVQDLrSIVEDYLLKIIDT----PGLLKPEQVSALFGNIESIYALNSQLLRDL-DSCNSDPVA--VASC 169
Cdd:COG5422   488 AIYEVIYTERDFVKDL-EYLRDTWIKPLEEsniiPENARRNFIKHVFANINEIYAVNSKLLKALtNRQCLSPIVngIADI 566

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502  170 FVERSQEFDIYTQYCNNYPNSVAALTEcmQDKQQAKFFR--DRQELLQHSLPLG--SYLLKPVQRVLKYHLLLQEIAKHF 245
Cdd:COG5422   567 FLDYVPKFEPFIKYGASQPYAKYEFER--EKSVNPNFARfdHEVERLDESRKLEldGYLTKPTTRLARYPLLLEEVLKFT 644

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502  246 DEEEDGFEVVEDAIDT----MTCVAWYINDMKRRHEHavrLQEIQSLLINWKGPDLT---TYGELVLEATFRVH------ 312
Cdd:COG5422   645 DPDNPDTEDIPKVIDMlrefLSRLNFESGKAENRGDL---FHLNQQLLFKPEYVNLGlndEYRKIIFKGVLKRKaksktd 721

                         250       260       270       280
                  ....*....|....*....|....*....|....*....|....
gi 167621502  313 -RVRNDRTFFLFDKILLITK-----KRGDHFVYKGHIPCSSLML 350
Cdd:COG5422   722 gSLRGDIQFFLLDNMLLFCKakavnKWRQHKVFQRPIPLELLFI 765

PH domain; PH stands for pleckstrin homology.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502   317 DRTFFLFDKILLITK--KRGDHFVYKGHIPCSSLMLIESTRDS-----LCFTV-THYKHSKQQYSIQAKTVEEKRSWTHH 388
Cdd:pfam00169   20 KRYFVLFDGSLLYYKddKSGKSKEPKGSISLSGCEVVEVVASDspkrkFCFELrTGERTGKRTYLLQAESEEERKDWIKA 99

                   ....*
gi 167621502   389 IKRLI 393
Cdd:pfam00169  100 IQSAI 104

Pleckstrin homology domain-containing family G members 1, 2, and 3 pleckstrin homology (PH) domain; PLEKHG1 (also called ARHGEF41), PLEKHG2 (also called ARHGEF42 or CLG/common-site lymphoma/leukemia guanine nucleotide exchange factor2), and PLEKHG3 (also called ARHGEF43) have RhoGEF DH/double-homology domains in tandem with a PH domain which is involved in phospholipid binding. They function as a guanine nucleotide exchange factor (GEF) and are involved in the regulation of Rho protein signal transduction. Mutations in PLEKHG1 have been associated panic disorder (PD), an anxiety disorder characterized by panic attacks and anticipatory anxiety. 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.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502  253 EVVEDAIDTMTCVAWYINDMKRRHEHAVRLQEIQSLLINWKGPDLTTYGELVLEATFRVHRVRNDRTFFLFDKILLITKK 332
Cdd:cd13243     2 SVVEEALDTMTQVAWHINDMKRKHEHAVRVQEIQSLLDGWEGPELTTYGDLVLEGTFRMAGAKNERLLFLFDKMLLITKK 81

                          90       100       110       120       130       140
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 167621502  333 RGDH-FVYKGHIPCSSLMLIES-TRDSLCFTVTHYKHSKQQYSIQAKTVEEKRSWTHHIKRLILEN 396
Cdd:cd13243    82 REDGiLQYKTHIMCSNLMLSESiPKEPLSFQVLPFDNPKLQYTLQAKNQEQKRLWTQEIKRLILEN 147

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.

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502     97 VVREIVETERMYVQDLRSIVEDYLLKIIDTPGLLKPEQVSALFGNIESIYALNSQLLRDLDSC----NSDPVAVASCFVE 172
Cdd:smart00325    1 VLKELLQTERNYVRDLKLLVEVFLKPLKKELKLLSPNELETLFGNIEEIYEFHRDFLDELEERieewDDSVERIGDVFLK 80

                            90       100       110       120       130       140       150       160
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502    173 RSQEFDIYTQYCNNYPNSVAALTECMQDKQQAKFFRDRQELLQH-SLPLGSYLLKPVQRVLKYHLLLQEIAKHFDEEEDG 251
Cdd:smart00325   81 LEEFFKIYSEYCSNHPDALELLKKLKKNPRFQKFLKEIESSPQCrRLTLESLLLKPVQRLTKYPLLLKELLKHTPEDHED 160

                           170       180
                    ....*....|....*....|
gi 167621502    252 FEVVEDAIDTMTCVAWYIND 271
Cdd:smart00325  161 REDLKKALKAIKELANQVNE 180

Collybistin/APC-stimulated guanine nucleotide exchange factor pleckstrin homology (PH) domain; Collybistin (also called PEM2) is homologous to the Dbl proteins ASEF (also called ARHGEF4/RhoGEF4) and SPATA13 (Spermatogenesis-associated protein 13; also called ASEF2). It activates CDC42 specifically and not any other Rho-family GTPases. Collybistin consists of an SH3 domain, followed by a RhoGEF/DH and PH domain. In Dbl proteins, the DH and PH domains catalyze the exchange of GDP for GTP in Rho GTPases, allowing them to signal to downstream effectors. It induces submembrane clustering of the receptor-associated peripheral membrane protein gephyrin, which is thought to form a scaffold underneath the postsynaptic membrane linking receptors to the cytoskeleton. It also acts as a tumor suppressor that links adenomatous polyposis coli (APC) protein, a negative regulator of the Wnt signaling pathway and promotes the phosphorylation and degradation of beta-catenin, to Cdc42. Autoinhibition of collybistin is accomplished by the binding of its SH3 domain with both the RhoGEF and PH domains to block access of Cdc42 to the GTPase-binding site. Inactivation promotes cancer progression. 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.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502  277 EHAVRLQEIQSLLINWKGPDLTTYGELVLEATfRVHRVR----NDRTFFLFDKILLITKK---RGDHFVYKGHIPcSSLM 349
Cdd:cd01224     2 ENLEKLAAWQSTVEGWEGEDLSDRSSELIHSG-ELTKISagraQERTFFLFDHQLVYCKKdllRRKNYIYKGRID-TDNM 79

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*
gi 167621502  350 LIESTRDSLCF----TVTH----YKHSKQQ-YSIQAKTVEEKRSW 385
Cdd:cd01224    80 EIEDLPDGKDDesgvTVKNawkiYNASKNKwYVLCAKSAEEKQRW 124

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.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 167621502  318 RTFFLFDKILLITKKRGD-HFVYKGHIPCSSLMLIESTRDSL---CFTVTHYKHskQQYSIQAKTVEEKRSWTHHI 389
Cdd:cd00821    19 RWFVLFEGVLLYYKSKKDsSYKPKGSIPLSGILEVEEVSPKErphCFELVTPDG--RTYYLQADSEEERQEWLKAL 92

DBL's big sister protein pleckstrin homology (PH) domain; Dbs (also called MCF2-transforming sequence-like protein 2) is a guanine nucleotide exchange factor (GEF), which contains spectrin repeats, a rhoGEF (DH) domain and a PH domain. The Dbs PH domain participates in binding to both the Cdc42 and RhoA GTPases. 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.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502  297 LTTYGELVLEATFRV-------HRV------RNDRTFFLFDKILLITKKRGDH-----FVYKGHIPCSSLMLIESTR-DS 357
Cdd:cd01227     9 LGDLGKLLMQGSFNVwtehkkgHTKklarfkPMQRHIFLYEKAVLFCKKRGENgeapsYSYKNSLNTTAVGLTENVKgDT 88

                          90       100       110
                  ....*....|....*....|....*....|....*....
gi 167621502  358 LCFTVtHYKHSKQQYSIQAKTVEEKRSWTHHIKRLILEN 396
Cdd:cd01227    89 KKFEI-WLNGREEVFIIQAPTPEIKAAWVKAIRQVLLSQ 126

Vav pleckstrin homology (PH) domain; Vav acts as a guanosine nucleotide exchange factor (GEF) for Rho/Rac proteins. They control processes including T cell activation, phagocytosis, and migration of cells. The Vav subgroup of Dbl GEFs consists of three family members (Vav1, Vav2, and Vav3) in mammals. Vav1 is preferentially expressed in the hematopoietic system, while Vav2 and Vav3 are described by broader expression patterns. Mammalian Vav proteins consist of a calponin homology (CH) domain, an acidic region, a catalytic Dbl homology (DH) domain, a PH domain, a zinc finger cysteine rich domain (C1/CRD), and an SH2 domain, flanked by two SH3 domains. In invertebrates such as Drosophila and C. elegans, Vav is missing the N-terminal SH3 domain. The DH domain is involved in RhoGTPase recognition and selectivity and stimulates the reorganization of the switch regions for GDP/GTP exchange. The PH domain is implicated in directing membrane localization, allosteric regulation of guanine nucleotide exchange activity, and as a phospholipid- dependent regulator of GEF activity. Vavs bind RhoGTPases including Rac1, RhoA, RhoG, and Cdc42, while other members of the GEF family are specific for a single RhoGTPase. This promiscuity is thought to be a result of its CRD. 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.polarized. PH domains also have diverse functions. They are often involved in targeting proteins to the plasma membrane, but only a few (less than 10%) display strong specificity in binding inositol phosphates. 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 kinases, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, cytoskeletal associated molecules, and in lipid associated enzymes.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502  286 QSLLINWKGPDLTTYGELVLEATFRV----HRVRNDRTFFLFDKILLITKK-RGDHFVYKGHIPCSS------LMLIEST 354
Cdd:cd01223     2 IQDLIENLNESLADYGRLQIDGELKIksheDQKKKDRYAFLFDKVLLICKSlRGDQYEYKEIINLSEyrieddPSRRTLK 81

                          90       100       110
                  ....*....|....*....|....*....|....
gi 167621502  355 RD---SLCFTVTHyKHSKQQYSIQAKTVEEKRSW 385
Cdd:cd01223    82 RDkrwSYQFLLVH-KQGKTAYTLYAKTEELKKKW 114

Shape and Conjugation Deficiency 1 Pleckstrin homology (PH) domain; Fission yeast Scd1 is an exchange factor for Cdc42 and an effector of Ras1, the homolog of the human H-Ras. Scd2/Bem1 mediates Cdc42 activation by binding to Scd1/Cdc24 and to Cdc42. Ras1 regulates Scd1/Cdc24/Ral1, which is a putative guanine nucleotide exchange factor for Cdc42, a member of the Rho family of Ras-like proteins. Cdc42 then activates the Shk1/Orb2 protein kinase. Scd1 interacts with Klp5 and Klp6 kinesins to mediate cytokinesis. 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.

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 167621502  273 KRRHEHAVRLQEIQSLLINWKGPDLTTYGELVLEATFRVHRVRNDRTF--FLFDKILLITK 331
Cdd:cd13246     1 QRRAENQQVVDDLKARVEDWKGHSLDSFGELLLHDTFTVRKDDSEREYhvYLFERILLCCK 61

FERM, RhoGEF and pleckstrin domain-containing protein 1 and related proteins Pleckstrin Homology (PH) domain, repeat 1; Members here include FARP1 (also called Chondrocyte-derived ezrin-like protein; PH domain-containing family C member 2), FARP2 (also called FIR/FERM domain including RhoGEF; FGD1-related Cdc42-GEF/FRG), and FARP6 (also called Zinc finger FYVE domain-containing protein 24). They are members of the Dbl family guanine nucleotide exchange factors (GEFs) which are upstream positive regulators of Rho GTPases. Little is known about FARP1 and FARP6, though FARP1 has increased expression in differentiated chondrocytes. FARP2 is thought to regulate neurite remodeling by mediating the signaling pathways from membrane proteins to Rac. It is found in brain, lung, and testis, as well as embryonic hippocampal and cortical neurons. FARP1 and FARP2 are composed of a N-terminal FERM domain, a proline-rich (PR) domain, Dbl-homology (DH), and two C-terminal PH domains. FARP6 is composed of Dbl-homology (DH), and two C-terminal PH domains separated by a FYVE domain. This hierarchy contains the first PH repeat. 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.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 167621502  316 NDRTFFLFDKILLITKKRGD---HFVYKGHIPCSSLMlIESTRDSL----CFTVThykHSKQQYSIQAKTVEEKRSWTHH 388
Cdd:cd01220    23 QQRMFFLFSDVLLYTSRSPTpslQFKVHGQLPLRGLM-VEESEPEWgvahCFTIY---GGNRALTVAASSEEEKERWLED 98

                  ....*
gi 167621502  389 IKRLI 393
Cdd:cd01220    99 LQRAI 103