phospholipase D2 isoform X2 [Homo sapiens]
Protein Classification
List of domain hits
| Name | Accession | Description | Interval | E-value | |||
| PLDc_SF super family | cl15239 | Catalytic domain of phospholipase D superfamily proteins; Catalytic domain of phospholipase D ... |
335-475 | 2.63e-99 | |||
Catalytic domain of phospholipase D superfamily proteins; Catalytic domain of phospholipase D (PLD) superfamily proteins. The PLD superfamily is composed of a large and diverse group of proteins including plant, mammalian and bacterial PLDs, bacterial cardiolipin (CL) synthases, bacterial phosphatidylserine synthases (PSS), eukaryotic phosphatidylglycerophosphate (PGP) synthase, eukaryotic tyrosyl-DNA phosphodiesterase 1 (Tdp1), and some bacterial endonucleases (Nuc and BfiI), among others. PLD enzymes hydrolyze phospholipid phosphodiester bonds to yield phosphatidic acid and a free polar head group. They can also catalyze the transphosphatidylation of phospholipids to acceptor alcohols. The majority of members in this superfamily contain a short conserved sequence motif (H-x-K-x(4)-D, where x represents any amino acid residue), called the HKD signature motif. There are varying expanded forms of this motif in different family members. Some members contain variant HKD motifs. Most PLD enzymes are monomeric proteins with two HKD motif-containing domains. Two HKD motifs from two domains form a single active site. Some PLD enzymes have only one copy of the HKD motif per subunit but form a functionally active dimer, which has a single active site at the dimer interface containing the two HKD motifs from both subunits. Different PLD enzymes may have evolved through domain fusion of a common catalytic core with separate substrate recognition domains. Despite their various catalytic functions and a very broad range of substrate specificities, the diverse group of PLD enzymes can bind to a phosphodiester moiety. Most of them are active as bi-lobed monomers or dimers, and may possess similar core structures for catalytic activity. They are generally thought to utilize a common two-step ping-pong catalytic mechanism, involving an enzyme-substrate intermediate, to cleave phosphodiester bonds. The two histidine residues from the two HKD motifs play key roles in the catalysis. Upon substrate binding, a histidine from one HKD motif could function as the nucleophile, attacking the phosphodiester bond to create a covalent phosphohistidine intermediate, while the other histidine residue from the second HKD motif could serve as a general acid, stabilizing the leaving group. The actual alignment was detected with superfamily member cd09843: Pssm-ID: 472788 [Multi-domain] Cd Length: 145 Bit Score: 299.60 E-value: 2.63e-99
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| PX_domain super family | cl02563 | The Phox Homology domain, a phosphoinositide binding module; The PX domain is a ... |
62-192 | 1.19e-75 | |||
The Phox Homology domain, a phosphoinositide binding module; The PX domain is a phosphoinositide (PI) binding module involved in targeting proteins to membranes. Proteins containing PX domains interact with PIs and have been implicated in highly diverse functions such as cell signaling, vesicular trafficking, protein sorting, lipid modification, cell polarity and division, activation of T and B cells, and cell survival. Many members of this superfamily bind phosphatidylinositol-3-phosphate (PI3P) but in some cases, other PIs such as PI4P or PI(3,4)P2, among others, are the preferred substrates. In addition to protein-lipid interaction, the PX domain may also be involved in protein-protein interaction, as in the cases of p40phox, p47phox, and some sorting nexins (SNXs). The PX domain is conserved from yeast to humans and is found in more than 100 proteins. The majority of PX domain-containing proteins are SNXs, which play important roles in endosomal sorting. The actual alignment was detected with superfamily member cd07297: Pssm-ID: 470617 Cd Length: 130 Bit Score: 237.51 E-value: 1.19e-75
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| PH_PLD | cd01254 | Phospholipase D pleckstrin homology (PH) domain; PLD hydrolyzes phosphatidylcholine to ... |
180-309 | 2.57e-48 | |||
Phospholipase D pleckstrin homology (PH) domain; PLD hydrolyzes phosphatidylcholine to phosphatidic acid (PtdOH), which can bind target proteins. PLD contains a PH domain, a PX domain and four conserved PLD signature domains. The PLD PH domain is specific for bisphosphorylated inositides. 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: 269956 Cd Length: 136 Bit Score: 165.51 E-value: 2.57e-48
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| Name | Accession | Description | Interval | E-value | ||||||||
| PLDc_vPLD2_1 | cd09843 | Catalytic domain, repeat 1, of vertebrate phospholipase D2; Catalytic domain, repeat 1, of ... |
335-475 | 2.63e-99 | ||||||||
Catalytic domain, repeat 1, of vertebrate phospholipase D2; Catalytic domain, repeat 1, of vertebrate phospholipase D2 (PLD2). PLDs play a pivotal role in transmembrane signaling and cellular regulation. They hydrolyze the terminal phosphodiester bond of phospholipids with the formation of phosphatidic acid and alcohols. Phosphatidic acid is an essential compound involved in signal transduction. They also catalyze a transphosphatidylation of phospholipids to acceptor alcohols, by which various phospholipids can be synthesized. Vertebrate PLD2 is a membrane associated phosphatidylinositol 4,5-bisphosphate (PIP2)-dependent enzyme that selectively hydrolyzes phosphatidylcholine (PC). Protein cofactors and calcium might be required for its activation. Most vertebrate PLDs have adjacent Phox (PX) and the Pleckstrin homology (PH) domains at their N-terminus, which have been shown to mediate membrane targeting of the protein and are closely linked to polyphosphoinositide signaling. Like other members of the PLD superfamily, the monomer of vertebrate PLDs consists of two catalytic domains, each of which contains one copy of the conserved HKD motif (H-x-K-x(4)-D, where x represents any amino acid residue). Two HKD motifs from two domains form a single active site. These PLDs utilize a common two-step ping-pong catalytic mechanism involving an enzyme-substrate intermediate to cleave phosphodiester bonds. The two histidine residues from the two HKD motifs play key roles in the catalysis. Upon substrate binding, a histidine residue from one HKD motif could function as the nucleophile, attacking the phosphodiester bond to create a covalent phosphohistidine intermediate, while the other histidine residue from the second HKD motif could serve as a general acid, stabilizing the leaving group. Pssm-ID: 197301 [Multi-domain] Cd Length: 145 Bit Score: 299.60 E-value: 2.63e-99
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| PX_PLD2 | cd07297 | The phosphoinositide binding Phox Homology domain of Phospholipase D2; The PX domain is a ... |
62-192 | 1.19e-75 | ||||||||
The phosphoinositide binding Phox Homology domain of Phospholipase D2; The PX domain is a phosphoinositide (PI) binding module present in many proteins with diverse functions such as cell signaling, vesicular trafficking, protein sorting, and lipid modification, among others. Phospholipase D (PLD) catalyzes the hydrolysis of the phosphodiester bond of phosphatidylcholine to generate membrane-bound phosphatidic acid and choline. PLD activity has been detected in viruses, bacteria, yeast, plants, and mammals, but the PX domain is not present in PLDs from viruses and bacteria. PLDs are implicated in many cellular functions like signaling, cytoskeletal reorganization, vesicular transport, stress responses, and the control of differentiation, proliferation, and survival. PLD2 contains PX and Pleckstrin Homology (PH) domains in addition to the catalytic domain. It mediates EGF-dependent insulin secretion and EGF-induced Ras activation by the guanine nucleotide-exchange factor Son of sevenless (Sos). It regulates mast cell activation by associating and promoting the activation of the protein tyrosine kinase Syk. PLD2 also participates in the sphingosine 1-phosphate-mediated pathway that stimulates the migration of endothelial cells, an important factor in angiogenesis. The PX domain is involved in targeting of proteins to PI-enriched membranes, and may also be involved in protein-protein interaction. Pssm-ID: 132830 Cd Length: 130 Bit Score: 237.51 E-value: 1.19e-75
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| PLN02866 | PLN02866 | phospholipase D |
66-540 | 3.66e-75 | ||||||||
phospholipase D Pssm-ID: 215467 [Multi-domain] Cd Length: 1068 Bit Score: 260.47 E-value: 3.66e-75
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| PH_PLD | cd01254 | Phospholipase D pleckstrin homology (PH) domain; PLD hydrolyzes phosphatidylcholine to ... |
180-309 | 2.57e-48 | ||||||||
Phospholipase D pleckstrin homology (PH) domain; PLD hydrolyzes phosphatidylcholine to phosphatidic acid (PtdOH), which can bind target proteins. PLD contains a PH domain, a PX domain and four conserved PLD signature domains. The PLD PH domain is specific for bisphosphorylated inositides. 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: 269956 Cd Length: 136 Bit Score: 165.51 E-value: 2.57e-48
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| Cls | COG1502 | Phosphatidylserine/phosphatidylglycerophosphate/cardiolipin synthase [Lipid transport and ... |
319-474 | 2.23e-16 | ||||||||
Phosphatidylserine/phosphatidylglycerophosphate/cardiolipin synthase [Lipid transport and metabolism]; Phosphatidylserine/phosphatidylglycerophosphate/cardiolipin synthase is part of the Pathway/BioSystem: Phospholipid biosynthesis Pssm-ID: 441111 [Multi-domain] Cd Length: 367 Bit Score: 81.14 E-value: 2.23e-16
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| PX | pfam00787 | PX domain; PX domains bind to phosphoinositides. |
92-192 | 3.70e-13 | ||||||||
PX domain; PX domains bind to phosphoinositides. Pssm-ID: 459940 Cd Length: 84 Bit Score: 65.34 E-value: 3.70e-13
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| PX | smart00312 | PhoX homologous domain, present in p47phox and p40phox; Eukaryotic domain of unknown function ... |
71-190 | 1.30e-11 | ||||||||
PhoX homologous domain, present in p47phox and p40phox; Eukaryotic domain of unknown function present in phox proteins, PLD isoforms, a PI3K isoform. Pssm-ID: 214610 Cd Length: 105 Bit Score: 61.59 E-value: 1.30e-11
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| PH | smart00233 | Pleckstrin homology domain; Domain commonly found in eukaryotic signalling proteins. The ... |
205-311 | 8.08e-06 | ||||||||
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: 44.85 E-value: 8.08e-06
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| PLDc | pfam00614 | Phospholipase D Active site motif; Phosphatidylcholine-hydrolysing phospholipase D (PLD) ... |
437-464 | 3.55e-04 | ||||||||
Phospholipase D Active site motif; Phosphatidylcholine-hydrolysing phospholipase D (PLD) isoforms are activated by ADP-ribosylation factors (ARFs). PLD produces phosphatidic acid from phosphatidylcholine, which may be essential for the formation of certain types of transport vesicles or may be constitutive vesicular transport to signal transduction pathways. PC-hydrolysing PLD is a homolog of cardiolipin synthase, phosphatidylserine synthase, bacterial PLDs, and viral proteins. Each of these appears to possess a domain duplication which is apparent by the presence of two motifs containing well-conserved histidine, lysine, and/or asparagine residues which may contribute to the active site. aspartic acid. An E. coli endonuclease (nuc) and similar proteins appear to be PLD homologs but possess only one of these motifs. The profile contained here represents only the putative active site regions, since an accurate multiple alignment of the repeat units has not been achieved. Pssm-ID: 395489 [Multi-domain] Cd Length: 28 Bit Score: 38.17 E-value: 3.55e-04
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| PLDc | smart00155 | Phospholipase D. Active site motifs; Phosphatidylcholine-hydrolyzing phospholipase D (PLD) ... |
437-464 | 1.66e-03 | ||||||||
Phospholipase D. Active site motifs; Phosphatidylcholine-hydrolyzing phospholipase D (PLD) isoforms are activated by ADP-ribosylation factors (ARFs). PLD produces phosphatidic acid from phosphatidylcholine, which may be essential for the formation of certain types of transport vesicles or may be constitutive vesicular transport to signal transduction pathways. PC-hydrolysing PLD is a homologue of cardiolipin synthase, phosphatidylserine synthase, bacterial PLDs, and viral proteins. Each of these appears to possess a domain duplication which is apparent by the presence of two motifs containing well-conserved histidine, lysine, aspartic acid, and/or asparagine residues which may contribute to the active site. An E. coli endonuclease (nuc) and similar proteins appear to be PLD homologues but possess only one of these motifs. The profile contained here represents only the putative active site regions, since an accurate multiple alignment of the repeat units has not been achieved. Pssm-ID: 197546 [Multi-domain] Cd Length: 28 Bit Score: 36.21 E-value: 1.66e-03
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| Name | Accession | Description | Interval | E-value | ||||||||
| PLDc_vPLD2_1 | cd09843 | Catalytic domain, repeat 1, of vertebrate phospholipase D2; Catalytic domain, repeat 1, of ... |
335-475 | 2.63e-99 | ||||||||
Catalytic domain, repeat 1, of vertebrate phospholipase D2; Catalytic domain, repeat 1, of vertebrate phospholipase D2 (PLD2). PLDs play a pivotal role in transmembrane signaling and cellular regulation. They hydrolyze the terminal phosphodiester bond of phospholipids with the formation of phosphatidic acid and alcohols. Phosphatidic acid is an essential compound involved in signal transduction. They also catalyze a transphosphatidylation of phospholipids to acceptor alcohols, by which various phospholipids can be synthesized. Vertebrate PLD2 is a membrane associated phosphatidylinositol 4,5-bisphosphate (PIP2)-dependent enzyme that selectively hydrolyzes phosphatidylcholine (PC). Protein cofactors and calcium might be required for its activation. Most vertebrate PLDs have adjacent Phox (PX) and the Pleckstrin homology (PH) domains at their N-terminus, which have been shown to mediate membrane targeting of the protein and are closely linked to polyphosphoinositide signaling. Like other members of the PLD superfamily, the monomer of vertebrate PLDs consists of two catalytic domains, each of which contains one copy of the conserved HKD motif (H-x-K-x(4)-D, where x represents any amino acid residue). Two HKD motifs from two domains form a single active site. These PLDs utilize a common two-step ping-pong catalytic mechanism involving an enzyme-substrate intermediate to cleave phosphodiester bonds. The two histidine residues from the two HKD motifs play key roles in the catalysis. Upon substrate binding, a histidine residue from one HKD motif could function as the nucleophile, attacking the phosphodiester bond to create a covalent phosphohistidine intermediate, while the other histidine residue from the second HKD motif could serve as a general acid, stabilizing the leaving group. Pssm-ID: 197301 [Multi-domain] Cd Length: 145 Bit Score: 299.60 E-value: 2.63e-99
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| PLDc_vPLD1_2_yPLD_like_1 | cd09138 | Catalytic domain, repeat 1, of vertebrate phospholipases, PLD1 and PLD2, yeast PLDs, and ... |
335-475 | 3.57e-89 | ||||||||
Catalytic domain, repeat 1, of vertebrate phospholipases, PLD1 and PLD2, yeast PLDs, and similar proteins; Catalytic domain, repeat 1, of vertebrate phospholipases D (PLD1 and PLD2), yeast phospholipase D (PLD SPO14/PLD1), and other similar eukaryotic proteins. These PLD enzymes play a pivotal role in transmembrane signaling and cellular regulation. They hydrolyze the terminal phosphodiester bond of phospholipids resulting in the formation of phosphatidic acid and alcohols. Phosphatidic acid is an essential compound involved in signal transduction. PLDs also catalyze the transphosphatidylation of phospholipids to acceptor alcohols, by which various phospholipids can be synthesized. The vertebrate PLD1 and PLD2 are membrane associated phosphatidylinositol 4,5-bisphosphate (PIP2)-dependent enzymes that selectively hydrolyze phosphatidylcholine (PC). Protein cofactors and calcium may be required for their activation. Yeast SPO14/PLD1 is a calcium-independent PLD, which needs PIP2 for its activity. Instead of the regulatory calcium-dependent phospholipid-binding C2 domain in plants, most mammalian and yeast PLDs have adjacent Phox (PX) and the Pleckstrin homology (PH) domains at the N-terminus, which have been shown to mediate membrane targeting of the protein and are closely linked to polyphosphoinositide signaling. The PX and PH domains are also present in zeta-type PLD from Arabidopsis, which is more closely related to vertebrate PLDs than to other plant PLD types. In addition, this subfamily also includes some related proteins which have either PX-like or PH domains in their N-termini. Like other members of the PLD superfamily, the monomer of mammalian and yeast PLDs consists of two catalytic domains, each containing one copy of the conserved HKD motif (H-x-K-x(4)-D, where x represents any amino acid residue). Two HKD motifs from the two domains form a single active site. These PLDs utilize a common two-step ping-pong catalytic mechanism involving an enzyme-substrate intermediate to cleave phosphodiester bonds. The two histidine residues from the two HKD motifs play key roles in the catalysis. Upon substrate binding, a histidine residue from one HKD motif could function as the nucleophile, attacking the phosphodiester bond to create a covalent phosphohistidine intermediate, while the other histidine residue from the second HKD motif could serve as a general acid, stabilizing the leaving group. Pssm-ID: 197236 [Multi-domain] Cd Length: 146 Bit Score: 273.28 E-value: 3.57e-89
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| PX_PLD2 | cd07297 | The phosphoinositide binding Phox Homology domain of Phospholipase D2; The PX domain is a ... |
62-192 | 1.19e-75 | ||||||||
The phosphoinositide binding Phox Homology domain of Phospholipase D2; The PX domain is a phosphoinositide (PI) binding module present in many proteins with diverse functions such as cell signaling, vesicular trafficking, protein sorting, and lipid modification, among others. Phospholipase D (PLD) catalyzes the hydrolysis of the phosphodiester bond of phosphatidylcholine to generate membrane-bound phosphatidic acid and choline. PLD activity has been detected in viruses, bacteria, yeast, plants, and mammals, but the PX domain is not present in PLDs from viruses and bacteria. PLDs are implicated in many cellular functions like signaling, cytoskeletal reorganization, vesicular transport, stress responses, and the control of differentiation, proliferation, and survival. PLD2 contains PX and Pleckstrin Homology (PH) domains in addition to the catalytic domain. It mediates EGF-dependent insulin secretion and EGF-induced Ras activation by the guanine nucleotide-exchange factor Son of sevenless (Sos). It regulates mast cell activation by associating and promoting the activation of the protein tyrosine kinase Syk. PLD2 also participates in the sphingosine 1-phosphate-mediated pathway that stimulates the migration of endothelial cells, an important factor in angiogenesis. The PX domain is involved in targeting of proteins to PI-enriched membranes, and may also be involved in protein-protein interaction. Pssm-ID: 132830 Cd Length: 130 Bit Score: 237.51 E-value: 1.19e-75
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| PLN02866 | PLN02866 | phospholipase D |
66-540 | 3.66e-75 | ||||||||
phospholipase D Pssm-ID: 215467 [Multi-domain] Cd Length: 1068 Bit Score: 260.47 E-value: 3.66e-75
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| PLDc_vPLD1_1 | cd09842 | Catalytic domain, repeat 1, of vertebrate phospholipase D1; Catalytic domain, repeat 1, of ... |
335-476 | 6.65e-73 | ||||||||
Catalytic domain, repeat 1, of vertebrate phospholipase D1; Catalytic domain, repeat 1, of vertebrate phospholipase D1 (PLD1). PLDs play a pivotal role in transmembrane signaling and cellular regulation. They hydrolyze the terminal phosphodiester bond of phospholipids resulting in the formation of phosphatidic acid and alcohols. Phosphatidic acid is an essential compound involved in signal transduction. PLDs also catalyze the transphosphatidylation of phospholipids to acceptor alcohols, by which various phospholipids can be synthesized. Vertebrate PLD1 is a membrane associated phosphatidylinositol 4,5-bisphosphate (PIP2)-dependent enzyme that selectively hydrolyzes phosphatidylcholine (PC). Protein cofactors and calcium might be required for its activation. Most vertebrate PLDs have adjacent Phox (PX) and the Pleckstrin homology (PH) domains at their N-terminus, which have been shown to mediate membrane targeting of the protein and are closely linked to polyphosphoinositide signaling. Like other members of the PLD superfamily, the monomer of vertebrate PLDs consists of two catalytic domains, each of which contains one copy of the conserved HKD motif (H-x-K-x(4)-D, where x represents any amino acid residue). Two HKD motifs from two domains form a single active site. These PLDs utilize a common two-step ping-pong catalytic mechanism involving an enzyme-substrate intermediate to cleave phosphodiester bonds. The two histidine residues from the two HKD motifs play key roles in the catalysis. Upon substrate binding, a histidine residue from one HKD motif could function as the nucleophile, attacking the phosphodiester bond to create a covalent phosphohistidine intermediate, while the other histidine residue from the second HKD motif could serve as a general acid, stabilizing the leaving group. Pssm-ID: 197300 [Multi-domain] Cd Length: 151 Bit Score: 231.46 E-value: 6.65e-73
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| PH_PLD | cd01254 | Phospholipase D pleckstrin homology (PH) domain; PLD hydrolyzes phosphatidylcholine to ... |
180-309 | 2.57e-48 | ||||||||
Phospholipase D pleckstrin homology (PH) domain; PLD hydrolyzes phosphatidylcholine to phosphatidic acid (PtdOH), which can bind target proteins. PLD contains a PH domain, a PX domain and four conserved PLD signature domains. The PLD PH domain is specific for bisphosphorylated inositides. 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: 269956 Cd Length: 136 Bit Score: 165.51 E-value: 2.57e-48
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| PX_PLD | cd06895 | The phosphoinositide binding Phox Homology domain of Phospholipase D; The PX domain is a ... |
62-192 | 2.63e-44 | ||||||||
The phosphoinositide binding Phox Homology domain of Phospholipase D; The PX domain is a phosphoinositide (PI) binding module present in many proteins with diverse functions such as cell signaling, vesicular trafficking, protein sorting, and lipid modification, among others. Phospholipase D (PLD) catalyzes the hydrolysis of the phosphodiester bond of phosphatidylcholine to generate membrane-bound phosphatidic acid and choline. Members of this subfamily contain PX and Pleckstrin Homology (PH) domains in addition to the catalytic domain. PLD activity has been detected in viruses, bacteria, yeast, plants, and mammals, but the PX domain is not present in PLDs from viruses and bacteria. PLDs are implicated in many cellular functions like signaling, cytoskeletal reorganization, vesicular transport, stress responses, and the control of differentiation, proliferation, and survival. Vertebrates contain two PLD isozymes, PLD1 and PLD2. PLD1 is located mainly in intracellular membranes while PLD2 is associated with plasma membranes. The PX domain is involved in targeting of proteins to PI-enriched membranes, and may also be involved in protein-protein interaction. Pssm-ID: 132805 Cd Length: 140 Bit Score: 154.85 E-value: 2.63e-44
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| PX_PLD1 | cd07296 | The phosphoinositide binding Phox Homology domain of Phospholipase D1; The PX domain is a ... |
62-192 | 2.01e-35 | ||||||||
The phosphoinositide binding Phox Homology domain of Phospholipase D1; The PX domain is a phosphoinositide binding module present in many proteins with diverse functions such as cell signaling, vesicular trafficking, protein sorting, and lipid modification, among others. Phospholipase D (PLD) catalyzes the hydrolysis of the phosphodiester bond of phosphatidylcholine to generate membrane-bound phosphatidic acid and choline. PLDs are implicated in many cellular functions like signaling, cytoskeletal reorganization, vesicular transport, stress responses, and the control of differentiation, proliferation, and survival. PLD1 contains PX and Pleckstrin Homology (PH) domains in addition to the catalytic domain. It acts as an effector of Rheb in the signaling of the mammalian target of rapamycin (mTOR), a serine/threonine protein kinase that transduces nutrients and other stimuli to regulate many cellular processes. PLD1 also regulates the secretion of the procoagulant von Willebrand factor (VWF) in endothelial cells. The PX domain is involved in targeting of proteins to PI-enriched membranes, and may also be involved in protein-protein interaction. The PX domain of PLD1 specifically binds to phosphatidylinositol-3,4,5-trisphosphate [PI(3,4,5)P3], which enables PLD1 to mediate signals via the ERK1/2 pathway. Pssm-ID: 132829 Cd Length: 135 Bit Score: 130.04 E-value: 2.01e-35
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| PLDc_vPLD1_2_like_1 | cd09104 | Catalytic domain, repeat 1, of vertebrate phospholipases, PLD1 and PLD2, and similar proteins; ... |
335-474 | 2.57e-32 | ||||||||
Catalytic domain, repeat 1, of vertebrate phospholipases, PLD1 and PLD2, and similar proteins; Catalytic domain, repeat 1, of phospholipase D (PLD, EC 3.1.4.4) found in yeast, plants, and vertebrates, and their bacterial homologs. PLDs are involved in signal transduction, vesicle formation, protein transport, and mitosis by participating in phospholipid metabolism. They hydrolyze the terminal phosphodiester bond of phospholipids resulting in the formation of phosphatidic acid and alcohols. Phosphatidic acid is an essential compound involved in signal transduction. PLDs also catalyze the transphosphatidylation of phospholipids to acceptor alcohols, by which various phospholipids can be synthesized. Both prokaryotic and eukaryotic PLDs have two HKD motifs (H-x-K-x(4)-D, where x represents any amino acid residue) that characterizes the phospholipase D (PLD) superfamily. PLDs are active as bi-lobed monomers. Each monomer contains two domains, each of which carries one copy of the HKD motif. Two HKD motifs from two domains form a single active site. PLDs utilize a common two-step ping-pong catalytic mechanism involving an enzyme-substrate intermediate to cleave phosphodiester bonds. The two histidine residues from the two HKD motifs play key roles in the catalysis. Upon substrate binding, a histidine residue from one HKD motif could function as the nucleophile, attacking the phosphodiester bond to create a covalent phosphohistidine intermediate, while the other histidine residue from the second HKD motif could serve as a general acid, stabilizing the leaving group. Pssm-ID: 197203 [Multi-domain] Cd Length: 147 Bit Score: 121.74 E-value: 2.57e-32
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| PLDc_vPLD1_2_like_bac_1 | cd09140 | Catalytic domain, repeat 1, of uncharacterized bacterial proteins with similarity to ... |
339-467 | 4.27e-17 | ||||||||
Catalytic domain, repeat 1, of uncharacterized bacterial proteins with similarity to vertebrate phospholipases, PLD1 and PLD2; Catalytic domain, repeat 1, of uncharacterized bacterial counterparts of vertebrate, yeast and plant phospholipase D (PLD, EC 3.1.4.4). PLDs hydrolyze the terminal phosphodiester bond of phospholipids with the formation of phosphatidic acid and alcohols. They also catalyze the transphosphatidylation of phospholipids to acceptor alcohols, by which various phospholipids can be synthesized. Instead of the regulatory C2 (calcium-activated lipid binding) domain in plants and the adjacent Phox (PX) and the Pleckstrin homology (PH) N-terminal domains in most mammalian and yeast PLDs, many members in this subfamily contain a SNARE associated C-terminal domain, whose functional role is unclear. Like other PLD enzymes, members in this subfamily contain two copies of the conserved HKD motif (H-x-K-x(4)-D, where x represents any amino acid residue), that may play an important role in the catalysis. Pssm-ID: 197238 [Multi-domain] Cd Length: 146 Bit Score: 78.36 E-value: 4.27e-17
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| Cls | COG1502 | Phosphatidylserine/phosphatidylglycerophosphate/cardiolipin synthase [Lipid transport and ... |
319-474 | 2.23e-16 | ||||||||
Phosphatidylserine/phosphatidylglycerophosphate/cardiolipin synthase [Lipid transport and metabolism]; Phosphatidylserine/phosphatidylglycerophosphate/cardiolipin synthase is part of the Pathway/BioSystem: Phospholipid biosynthesis Pssm-ID: 441111 [Multi-domain] Cd Length: 367 Bit Score: 81.14 E-value: 2.23e-16
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| PLDc_pPLD_like_1 | cd09139 | Catalytic domain, repeat 1, of plant phospholipase D and similar proteins; Catalytic domain, ... |
338-472 | 1.24e-15 | ||||||||
Catalytic domain, repeat 1, of plant phospholipase D and similar proteins; Catalytic domain, repeat 1, of plant phospholipase D (PLD, EC 3.1.4.4) and similar proteins. Plant PLDs have broad substrate specificity and can hydrolyze the terminal phosphodiester bond of several common membrane phospholipids such as phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylglycerol (PG), and phosphatidylserine (PS), with the formation of phosphatidic acid and alcohols. Phosphatidic acid is an essential compound involved in signal transduction. PLDs also catalyze the transphosphatidylation of phospholipids to acceptor alcohols, by which various phospholipids can be synthesized. Most plant PLDs possess a regulatory calcium-dependent phospholipid-binding C2 domain in the N-terminus and require calcium for activity, which is unique to plant PLDs and is not present in animal or fungal PLDs. Like other PLD enzymes, the monomer of plant PLDs consists of two catalytic domains, each of which contains one copy of the conserved HKD motif (H-x-K-x(4)-D, where x represents any amino acid residue). Two HKD motifs from two domains form a single active site. Plant PLDs may utilize a common two-step ping-pong catalytic mechanism involving an enzyme-substrate intermediate to cleave phosphodiester bonds. The two histidine residues from the two HKD motifs play key roles in the catalysis. Upon substrate binding, a histidine residue from one HKD motif could function as the nucleophile, attacking the phosphodiester bond to create a covalent phosphohistidine intermediate, while the other histidine residue from the second HKD motif could serve as a general acid, stabilizing the leaving group. This subfamily includes two types of plant PLDs, alpha-type and beta-type PLDs, which are derived from different gene products and distinctly regulated. The zeta-type PLD from Arabidopsis is not included in this subfamily. Pssm-ID: 197237 [Multi-domain] Cd Length: 176 Bit Score: 75.13 E-value: 1.24e-15
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| PX | pfam00787 | PX domain; PX domains bind to phosphoinositides. |
92-192 | 3.70e-13 | ||||||||
PX domain; PX domains bind to phosphoinositides. Pssm-ID: 459940 Cd Length: 84 Bit Score: 65.34 E-value: 3.70e-13
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| PLDc_pPLDalpha_1 | cd09197 | Catalytic domain, repeat 1, of plant alpha-type phospholipase D; Catalytic domain, repeat 1, ... |
348-472 | 3.96e-12 | ||||||||
Catalytic domain, repeat 1, of plant alpha-type phospholipase D; Catalytic domain, repeat 1, of plant alpha-type phospholipase D (PLDalpha, EC 3.1.4.4). Plant PLDalpha is a phosphatidylinositol 4,5-bisphosphate (PIP2)-independent PLD that possesses a regulatory calcium-dependent phospholipid-binding C2 domain in the N-terminus and require millimolar calcium for optimal activity. The C2 domain is unique to plant PLDs and is not present in animal or fungal PLDs. Like other PLD enzymes, the monomer of plant PLDalpha consists of two catalytic domains, each of which contains one copy of the conserved HKD motif (H-x-K-x(4)-D, where x represents any amino acid residue). Two HKD motifs from two domains form a single active site. Plant PLDalpha may utilize a common two-step ping-pong catalytic mechanism involving an enzyme-substrate intermediate to cleave phosphodiester bonds. The two histidine residues from the two HKD motifs play key roles in the catalysis. Upon substrate binding, a histidine residue from one HKD motif could function as the nucleophile, attacking the phosphodiester bond to create a covalent phosphohistidine intermediate, while the other histidine residue from the second HKD motif could serve as a general acid, stabilizing the leaving group. Pssm-ID: 197293 [Multi-domain] Cd Length: 178 Bit Score: 64.94 E-value: 3.96e-12
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| PX | smart00312 | PhoX homologous domain, present in p47phox and p40phox; Eukaryotic domain of unknown function ... |
71-190 | 1.30e-11 | ||||||||
PhoX homologous domain, present in p47phox and p40phox; Eukaryotic domain of unknown function present in phox proteins, PLD isoforms, a PI3K isoform. Pssm-ID: 214610 Cd Length: 105 Bit Score: 61.59 E-value: 1.30e-11
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| PLN02270 | PLN02270 | phospholipase D alpha |
348-466 | 1.78e-11 | ||||||||
phospholipase D alpha Pssm-ID: 165912 [Multi-domain] Cd Length: 808 Bit Score: 67.28 E-value: 1.78e-11
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| PLN02352 | PLN02352 | phospholipase D epsilon |
348-466 | 3.91e-10 | ||||||||
phospholipase D epsilon Pssm-ID: 215202 [Multi-domain] Cd Length: 758 Bit Score: 63.01 E-value: 3.91e-10
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| PLDc_CLS_1 | cd09110 | Catalytic domain, repeat 1, of bacterial cardiolipin synthase and similar proteins; Catalytic ... |
339-473 | 1.25e-09 | ||||||||
Catalytic domain, repeat 1, of bacterial cardiolipin synthase and similar proteins; Catalytic domain, repeat 1, of bacterial cardiolipin (CL) synthase and a few homologs found in eukaryotes and archaea. Bacterial CL synthases catalyze the reversible phosphatidyl group transfer between two phosphatidylglycerol molecules to form CL and glycerol. The monomer of bacterial CL synthase consists of two catalytic domains. Each catalytic domain contains one copy of the conserved HKD motif (H-x-K-x(4)-D, where x represents any amino acid residue) that characterizes the phospholipase D (PLD) superfamily. Two HKD motifs from two domains form a single active site involved in phosphatidyl group transfer. Bacterial CL synthases can be stimulated by phosphate and inhibited by CL, the product of the reaction, and by phosphatidate. Phosphate stimulation may be unique to enzymes with CL synthase activity belonging to the PLD superfamily. Like other PLD enzymes, bacterial CL synthases utilize a common two-step ping-pong catalytic mechanism involving an enzyme-substrate intermediate to cleave phosphodiester bonds. The two histidine residues from the two HKD motifs play key roles in the catalysis. Upon substrate binding, a histidine residue from one HKD motif could function as the nucleophile, attacking the phosphodiester bond to create a covalent phosphohistidine intermediate, while the other histidine residue from the second HKD motif could serve as a general acid, stabilizing the leaving group. Pssm-ID: 197209 [Multi-domain] Cd Length: 154 Bit Score: 57.10 E-value: 1.25e-09
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| PLDc_pPLDbeta_1 | cd09198 | Catalytic domain, repeat 1, of plant beta-type phospholipase D; Catalytic domain, repeat 1, of ... |
350-472 | 1.96e-09 | ||||||||
Catalytic domain, repeat 1, of plant beta-type phospholipase D; Catalytic domain, repeat 1, of plant beta-type phospholipase D (PLDbeta, EC 3.1.4.4). Plant PLDbeta is a phosphatidylinositol 4,5-bisphosphate (PIP2)-dependent PLD that possesses a regulatory calcium-dependent phospholipid-binding C2 domain in the N-terminus and requires nanomolar calcium and cytosolic factors for optimal activity. The C2 domain is unique to plant PLDs and is not present in animal or fungal PLDs. Sequence analysis shows that plant PLDbeta is evolutionarily divergent from alpha-type plant PLD, and plant PLDbeta is more closely related to mammalian and yeast PLDs than to plant PLDalpha. Like other PLD enzymes, the monomer of plant PLDbeta consists of two catalytic domains, each of which contains one copy of the conserved HKD motif (H-x-K-x(4)-D, where x represents any amino acid residue). Two HKD motifs from two domains form a single active site. Plant PLDbeta may utilize a common two-step ping-pong catalytic mechanism involving an enzyme-substrate intermediate to cleave phosphodiester bonds. The two histidine residues from the two HKD motifs play key roles in the catalysis. Upon substrate binding, a histidine residue from one HKD motif could function as the nucleophile, attacking the phosphodiester bond to create a covalent phosphohistidine intermediate, while the other histidine residue from the second HKD motif could serve as a general acid, stabilizing the leaving group. Pssm-ID: 197294 [Multi-domain] Cd Length: 180 Bit Score: 57.21 E-value: 1.96e-09
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| PX_IRAS | cd06875 | The phosphoinositide binding Phox Homology domain of the Imidazoline Receptor ... |
64-190 | 1.22e-08 | ||||||||
The phosphoinositide binding Phox Homology domain of the Imidazoline Receptor Antisera-Selected; The PX domain is a phosphoinositide binding (PI) module present in many proteins with diverse functions such as cell signaling, vesicular trafficking, protein sorting, and lipid modification, among others. Imidazoline Receptor Antisera-Selected (IRAS), also called nischarin, contains an N-terminal PX domain, leucine rich repeats, and a predicted coiled coil domain. The PX domain of IRAS binds to phosphatidylinositol-3-phosphate in membranes. Together with the coiled coil domain, it is essential for the localization of IRAS to endosomes. IRAS has been shown to interact with integrin and inhibit cell migration. Its interaction with alpha5 integrin causes a redistribution of the receptor from the cell surface to endosomal structures, suggesting that IRAS may function as a sorting nexin (SNX) which regulates the endosomal trafficking of integrin. SNXs make up the largest group among PX domain containing proteins. They are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in PI-binding specificity and affinity, and the presence of other protein-protein interaction domains, which help determine subcellular localization and specific function in the endocytic pathway. Pssm-ID: 132785 Cd Length: 116 Bit Score: 53.44 E-value: 1.22e-08
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| PX_domain | cd06093 | The Phox Homology domain, a phosphoinositide binding module; The PX domain is a ... |
66-190 | 1.47e-08 | ||||||||
The Phox Homology domain, a phosphoinositide binding module; The PX domain is a phosphoinositide (PI) binding module involved in targeting proteins to membranes. Proteins containing PX domains interact with PIs and have been implicated in highly diverse functions such as cell signaling, vesicular trafficking, protein sorting, lipid modification, cell polarity and division, activation of T and B cells, and cell survival. Many members of this superfamily bind phosphatidylinositol-3-phosphate (PI3P) but in some cases, other PIs such as PI4P or PI(3,4)P2, among others, are the preferred substrates. In addition to protein-lipid interaction, the PX domain may also be involved in protein-protein interaction, as in the cases of p40phox, p47phox, and some sorting nexins (SNXs). The PX domain is conserved from yeast to humans and is found in more than 100 proteins. The majority of PX domain-containing proteins are SNXs, which play important roles in endosomal sorting. Pssm-ID: 132768 [Multi-domain] Cd Length: 106 Bit Score: 52.75 E-value: 1.47e-08
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| PLDc_PaCLS_like_1 | cd09155 | Putative catalytic domain, repeat 1, of Pseudomonas aeruginosa cardiolipin synthase and ... |
339-473 | 1.79e-07 | ||||||||
Putative catalytic domain, repeat 1, of Pseudomonas aeruginosa cardiolipin synthase and similar proteins; Putative catalytic domain, repeat 1, of Pseudomonas aeruginosa cardiolipin (CL) synthase (PaCLS) and similar proteins. Although PaCLS and similar proteins have not been functionally characterized, members in this subfamily show high sequence homology to bacterial CL synthases, which catalyze the reversible phosphatidyl group transfer between two phosphatidylglycerol molecules to form CL and glycerol. Moreover, PaCLS and other members of this subfamily contain two HKD motifs (H-x-K-x(4)-D, where x represents any amino acid residue) that characterizes the phospholipase D (PLD) superfamily. The two motifs may be part of the active site and may be involved in phosphatidyl group transfer. Pssm-ID: 197252 [Multi-domain] Cd Length: 156 Bit Score: 51.09 E-value: 1.79e-07
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| PLDc_SF | cd00138 | Catalytic domain of phospholipase D superfamily proteins; Catalytic domain of phospholipase D ... |
346-466 | 4.93e-07 | ||||||||
Catalytic domain of phospholipase D superfamily proteins; Catalytic domain of phospholipase D (PLD) superfamily proteins. The PLD superfamily is composed of a large and diverse group of proteins including plant, mammalian and bacterial PLDs, bacterial cardiolipin (CL) synthases, bacterial phosphatidylserine synthases (PSS), eukaryotic phosphatidylglycerophosphate (PGP) synthase, eukaryotic tyrosyl-DNA phosphodiesterase 1 (Tdp1), and some bacterial endonucleases (Nuc and BfiI), among others. PLD enzymes hydrolyze phospholipid phosphodiester bonds to yield phosphatidic acid and a free polar head group. They can also catalyze the transphosphatidylation of phospholipids to acceptor alcohols. The majority of members in this superfamily contain a short conserved sequence motif (H-x-K-x(4)-D, where x represents any amino acid residue), called the HKD signature motif. There are varying expanded forms of this motif in different family members. Some members contain variant HKD motifs. Most PLD enzymes are monomeric proteins with two HKD motif-containing domains. Two HKD motifs from two domains form a single active site. Some PLD enzymes have only one copy of the HKD motif per subunit but form a functionally active dimer, which has a single active site at the dimer interface containing the two HKD motifs from both subunits. Different PLD enzymes may have evolved through domain fusion of a common catalytic core with separate substrate recognition domains. Despite their various catalytic functions and a very broad range of substrate specificities, the diverse group of PLD enzymes can bind to a phosphodiester moiety. Most of them are active as bi-lobed monomers or dimers, and may possess similar core structures for catalytic activity. They are generally thought to utilize a common two-step ping-pong catalytic mechanism, involving an enzyme-substrate intermediate, to cleave phosphodiester bonds. The two histidine residues from the two HKD motifs play key roles in the catalysis. Upon substrate binding, a histidine from one HKD motif could function as the nucleophile, attacking the phosphodiester bond to create a covalent phosphohistidine intermediate, while the other histidine residue from the second HKD motif could serve as a general acid, stabilizing the leaving group. Pssm-ID: 197200 [Multi-domain] Cd Length: 119 Bit Score: 48.67 E-value: 4.93e-07
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| PH | smart00233 | Pleckstrin homology domain; Domain commonly found in eukaryotic signalling proteins. The ... |
205-311 | 8.08e-06 | ||||||||
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: 44.85 E-value: 8.08e-06
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| PLDc_SMU_988_like_1 | cd09154 | Putative catalytic domain, repeat 1, of Streptococcus mutans uncharacterized protein SMU_988 ... |
338-481 | 1.20e-05 | ||||||||
Putative catalytic domain, repeat 1, of Streptococcus mutans uncharacterized protein SMU_988 and similar proteins; Putative catalytic domain, repeat 1, of Streptococcus mutans uncharacterized protein SMU_988 and similar proteins. Although SMU_988 and similar proteins have not been functionally characterized, members in this subfamily show high sequence homology to bacterial cardiolipin (CL) synthases, which catalyze the reversible phosphatidyl group transfer between two phosphatidylglycerol molecules to form CL and glycerol. Members of this subfamily contain two HKD motifs (H-x-K-x(4)-D, where x represents any amino acid residue) that characterizes the phospholipase D (PLD) superfamily. The two motifs may be part of the active site and may be involved in phosphatidyl group transfer. Pssm-ID: 197251 [Multi-domain] Cd Length: 155 Bit Score: 45.60 E-value: 1.20e-05
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| PLN03008 | PLN03008 | Phospholipase D delta |
351-472 | 8.37e-05 | ||||||||
Phospholipase D delta Pssm-ID: 178585 [Multi-domain] Cd Length: 868 Bit Score: 45.86 E-value: 8.37e-05
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| PLDc_C_DEXD_like | cd09126 | C-terminal putative phospholipase D-like domain of uncharacterized prokaryotic HKD family ... |
336-467 | 1.10e-04 | ||||||||
C-terminal putative phospholipase D-like domain of uncharacterized prokaryotic HKD family nucleases fused to DEAD/DEAH box helicases; C-terminal putative phospholipase D (PLD)-like domain of uncharacterized prokaryotic HKD family nucleases fused to a DEAD/DEAH box helicase domain. All members of this subfamily are uncharacterized. In addition to the helicase-like region, members of this family also contain a PLD-like domain in the C-terminal region, which is characterized by a variant HKD (H-x-K-x(4)-D motif, where x represents any amino acid residue) motif. Due to the lack of key residues related to PLD activity in the variant HKD motif, members of this subfamily are most unlikely to carry PLD activity. Pssm-ID: 197224 [Multi-domain] Cd Length: 126 Bit Score: 42.24 E-value: 1.10e-04
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| PLDc | pfam00614 | Phospholipase D Active site motif; Phosphatidylcholine-hydrolysing phospholipase D (PLD) ... |
437-464 | 3.55e-04 | ||||||||
Phospholipase D Active site motif; Phosphatidylcholine-hydrolysing phospholipase D (PLD) isoforms are activated by ADP-ribosylation factors (ARFs). PLD produces phosphatidic acid from phosphatidylcholine, which may be essential for the formation of certain types of transport vesicles or may be constitutive vesicular transport to signal transduction pathways. PC-hydrolysing PLD is a homolog of cardiolipin synthase, phosphatidylserine synthase, bacterial PLDs, and viral proteins. Each of these appears to possess a domain duplication which is apparent by the presence of two motifs containing well-conserved histidine, lysine, and/or asparagine residues which may contribute to the active site. aspartic acid. An E. coli endonuclease (nuc) and similar proteins appear to be PLD homologs but possess only one of these motifs. The profile contained here represents only the putative active site regions, since an accurate multiple alignment of the repeat units has not been achieved. Pssm-ID: 395489 [Multi-domain] Cd Length: 28 Bit Score: 38.17 E-value: 3.55e-04
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| PLDc_ymdC_like_1 | cd09111 | Putative catalytic domain, repeat 1, of Escherichia coli uncharacterized protein ymdC and ... |
387-457 | 3.66e-04 | ||||||||
Putative catalytic domain, repeat 1, of Escherichia coli uncharacterized protein ymdC and similar proteins; Putative catalytic domain, repeat 1, of Escherichia coli uncharacterized protein ymdC and similar proteins. In Escherichia coli, there are two genes, f413 (ybhO) and o493 (ymdC), which are homologous to gene cls that encodes the Escherichia coli cardiolipin (CL) synthase. The prototype of this subfamily is an uncharacterized protein ymdC specified by the o493 (ymdC) gene. Although the functional characterization of ymdC and similar proteins remains unknown, members of this subfamily show high sequence homology to bacterial CL synthases, which catalyze the reversible phosphatidyl group transfer between two phosphatidylglycerol molecules to form CL and glycerol. Moreover, ymdC and its similar proteins contain two HKD motifs (H-x-K-x(4)-D, where x represents any amino acid residue) that characteriszes the phospholipase D (PLD) superfamily. The two motifs may be part of the active site and may be involved in phosphatidyl group transfer. Pssm-ID: 197210 [Multi-domain] Cd Length: 162 Bit Score: 41.37 E-value: 3.66e-04
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| PLDc_unchar1_1 | cd09127 | Putative catalytic domain, repeat 1, of uncharacterized phospholipase D-like proteins; ... |
338-456 | 8.33e-04 | ||||||||
Putative catalytic domain, repeat 1, of uncharacterized phospholipase D-like proteins; Putative catalytic domain, repeat 1, of uncharacterized phospholipase D (PLD, EC 3.1.4.4)-like proteins. PLD enzymes hydrolyze phospholipid phosphodiester bonds to yield phosphatidic acid and a free polar head group. They can also catalyze transphosphatidylation of phospholipids to acceptor alcohols. Members of this subfamily contain two HKD motifs (H-x-K-x(4)-D, where x represents any amino acid residue) that characterizes the PLD superfamily. The two motifs may be part of the active site and may be involved in phosphatidyl group transfer. Pssm-ID: 197225 [Multi-domain] Cd Length: 141 Bit Score: 39.94 E-value: 8.33e-04
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| PLDc | smart00155 | Phospholipase D. Active site motifs; Phosphatidylcholine-hydrolyzing phospholipase D (PLD) ... |
437-464 | 1.66e-03 | ||||||||
Phospholipase D. Active site motifs; Phosphatidylcholine-hydrolyzing phospholipase D (PLD) isoforms are activated by ADP-ribosylation factors (ARFs). PLD produces phosphatidic acid from phosphatidylcholine, which may be essential for the formation of certain types of transport vesicles or may be constitutive vesicular transport to signal transduction pathways. PC-hydrolysing PLD is a homologue of cardiolipin synthase, phosphatidylserine synthase, bacterial PLDs, and viral proteins. Each of these appears to possess a domain duplication which is apparent by the presence of two motifs containing well-conserved histidine, lysine, aspartic acid, and/or asparagine residues which may contribute to the active site. An E. coli endonuclease (nuc) and similar proteins appear to be PLD homologues but possess only one of these motifs. The profile contained here represents only the putative active site regions, since an accurate multiple alignment of the repeat units has not been achieved. Pssm-ID: 197546 [Multi-domain] Cd Length: 28 Bit Score: 36.21 E-value: 1.66e-03
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| Cls | COG1502 | Phosphatidylserine/phosphatidylglycerophosphate/cardiolipin synthase [Lipid transport and ... |
347-456 | 3.41e-03 | ||||||||
Phosphatidylserine/phosphatidylglycerophosphate/cardiolipin synthase [Lipid transport and metabolism]; Phosphatidylserine/phosphatidylglycerophosphate/cardiolipin synthase is part of the Pathway/BioSystem: Phospholipid biosynthesis Pssm-ID: 441111 [Multi-domain] Cd Length: 367 Bit Score: 40.31 E-value: 3.41e-03
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| PH | cd00821 | Pleckstrin homology (PH) domain; PH domains have diverse functions, but in general are ... |
205-306 | 3.45e-03 | ||||||||
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: 37.14 E-value: 3.45e-03
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| PX_KIF16B_SNX23 | cd06874 | The phosphoinositide binding Phox Homology domain of KIF16B kinesin or Sorting Nexin 23; The ... |
87-175 | 3.56e-03 | ||||||||
The phosphoinositide binding Phox Homology domain of KIF16B kinesin or Sorting Nexin 23; The PX domain is a phosphoinositide (PI) binding module present in many proteins with diverse functions such as cell signaling, vesicular trafficking, protein sorting, and lipid modification, among others. KIF16B, also called sorting nexin 23 (SNX23), is a family-3 kinesin which harbors an N-terminal kinesin motor domain containing ATP and microtubule binding sites, a ForkHead Associated (FHA) domain, and a C-terminal PX domain. The PX domain of KIF16B binds to phosphatidylinositol-3-phosphate (PI3P) in early endosomes and plays a role in the transport of early endosomes to the plus end of microtubules. By regulating early endosome plus end motility, KIF16B modulates the balance between recycling and degradation of receptors. SNXs make up the largest group among PX domain containing proteins. They are involved in regulating membrane traffic and protein sorting in the endosomal system. The PX domain of SNXs binds PIs and targets the protein to PI-enriched membranes. SNXs differ from each other in PI-binding specificity and affinity, and the presence of other protein-protein interaction domains, which help determine subcellular localization and specific function in the endocytic pathway. Pssm-ID: 132784 Cd Length: 127 Bit Score: 38.13 E-value: 3.56e-03
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| PX_SNX19_like_plant | cd06872 | The phosphoinositide binding Phox Homology domain of uncharacterized SNX19-like plant proteins; ... |
67-114 | 6.81e-03 | ||||||||
The phosphoinositide binding Phox Homology domain of uncharacterized SNX19-like plant proteins; The PX domain is a phosphoinositide (PI) binding module involved in targeting proteins to PI-enriched membranes. Members in this subfamily are uncharacterized plant proteins containing an N-terminal PXA domain, a central PX domain, and a C-terminal domain that is conserved in some sorting nexins (SNXs). This is the same domain architecture found in SNX19. SNX13 and SNX14 also contain these three domains but also contain a regulator of G protein signaling (RGS) domain in between the PXA and PX domains. SNXs make up the largest group among PX domain containing proteins. They are involved in regulating membrane traffic and protein sorting in the endosomal system. The PX domain of SNXs binds PIs and targets the protein to PI-enriched membranes. SNXs differ from each other in PI-binding specificity and affinity, and the presence of other protein-protein interaction domains, which help determine subcellular localization and specific function in the endocytic pathway. In addition to protein-lipid interaction, the PX domain may also be involved in protein-protein interaction. Pssm-ID: 132782 Cd Length: 107 Bit Score: 36.73 E-value: 6.81e-03
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| PLDc_like_TrmB_middle | cd09124 | Middle phospholipase D-like domain of the transcriptional regulator TrmB and similar proteins; ... |
337-467 | 7.25e-03 | ||||||||
Middle phospholipase D-like domain of the transcriptional regulator TrmB and similar proteins; Middle phospholipase D (PLD)-like domain of the transcriptional regulator TrmB and similar proteins. TrmB acts as a bifunctional sugar-sensing transcriptional regulator which controls two operons encoding maltose/trehalose and maltodextrin ABC transporters of Pyrococcus fruiosus. It functions as a dimer. Full length TrmB includes an N-terminal DNA-binding domain, a C-terminal sugar-binding domain and middle region that has been named as a PLD-like domain. The middle domain displays homology to PLD enzymes, which contain one or two HKD motifs (H-x-K-x(4)-D, where x represents any amino acid residue) per chain. The HKD motif characterizes the PLD superfamily. Due to the lack of key residues related to PLD activity in the PLD-like domain, members of this subfamily are unlikely to carry PLD activity. Pssm-ID: 197223 [Multi-domain] Cd Length: 126 Bit Score: 36.92 E-value: 7.25e-03
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