Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1l8sa_ All alpha proteins Phospholipase A2, PLA2 Phospholipase A2, PLA2 Vertebrate phospholipase A2 Phospholipase A2 pig (Sus scrofa ) [TaxId: 9823 ], SCOPe (2.08)
Bd1l8sb_ All alpha proteins Phospholipase A2, PLA2 Phospholipase A2, PLA2 Vertebrate phospholipase A2 Phospholipase A2 pig (Sus scrofa ) [TaxId: 9823 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyPhospholipase A2, PLA2 8036500 3001690 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyPhospholipase A2, PLA2 8036500 3001690 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
APhospholip_A2_1e1l8sA1 A: few secondary structure elementsX: Phospholipase A2, PLA2 (From Topology)H: Phospholipase A2, PLA2 (From Topology)T: Phospholipase A2, PLA2F: Phospholip_A2_1ECOD (1.6)
BPhospholip_A2_1e1l8sB1 A: few secondary structure elementsX: Phospholipase A2, PLA2 (From Topology)H: Phospholipase A2, PLA2 (From Topology)T: Phospholipase A2, PLA2F: Phospholip_A2_1ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A1.20.90.10 Mainly Alpha Up-down Bundle Phospholipase A2 Phospholipase A2 domainCATH (4.3.0)
B1.20.90.10 Mainly Alpha Up-down Bundle Phospholipase A2 Phospholipase A2 domainCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF00068Phospholipase A2 (Phospholip_A2_1)Phospholipase A2Phospholipase A2 releases fatty acids from the second carbon group of glycerol. Perhaps the best known members are secreted snake venoms, but also found in secreted pancreatic and membrane-associated forms. Structure is all-alpha, with two core disul ...Phospholipase A2 releases fatty acids from the second carbon group of glycerol. Perhaps the best known members are secreted snake venoms, but also found in secreted pancreatic and membrane-associated forms. Structure is all-alpha, with two core disulfide-linked helices and a calcium-binding loop. This alignment represents the major family of PLA2s. A second minor family, defined by the honeybee venom PLA2 PDB:1POC and related sequences from Gila monsters (Heloderma), is not recognised. This minor family conserves the core helix pair but is substantially different elsewhere. The PROSITE pattern PA2_HIS, specific to the first core helix, recognises both families.
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B
PHOSPHOLIPASE A2, MAJOR ISOENZYME

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
phospholipase A2 (group IB)  M-CSA #83

PLA2 catalyses the hydroylsis of the 2-acyl ester of 1,2-diacylphosphatides. Two forms of PLA2 are known: the small secretory PLA2s which are amphipathic molecules usually found associated with lipid membranes, and the larger cytosolic forms. This annotation is for the small secretory form. Secretory PLA2s form part of the neurotoxic component of many snake and bee venoms due to its ability to block acetylcholine release.

Secretory PLA2s have been divided into 3 main groups: I, II, and III. Class I (present in some snake venoms and in mammalian exocrine pancrease) and II (present in some snake venoms and also broadly distributed among a variety of mammalian cell types) are closely related to each other. The class III enzymes (including venom enzymes from the honeybee and the Gila monster) appear to form a separate divergent group though their active site and mechanism is similar. The key catalytic histidine and aspartate are in very similar orientations however the residues making up the rest of the hydrogen bond network are not conserved spatially.

Defined by 8 residues: TYR:B-28GLY:B-30GLY:B-32HIS:B-48ASP:B-49TYR:B-52TYR:B-73ASP:B-99
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