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

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1waba_ Alpha and beta proteins (a/b) Flavodoxin-like SGNH hydrolase Acetylhydrolase Platelet-activating factor acetylhydrolase (Bos taurus ) [TaxId: 9913 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilySGNH hydrolase-like 8044119 3001315 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ALipase_GDSL_2e1wabA1 A: a/b three-layered sandwichesX: Flavodoxin-likeH: SGNH hydrolase (From Topology)T: SGNH hydrolaseF: Lipase_GDSL_2ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.40.50.1110 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold SGNH hydrolaseCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF13472GDSL-like Lipase/Acylhydrolase family (Lipase_GDSL_2)GDSL-like Lipase/Acylhydrolase familyThis family of presumed lipases and related enzymes are similar to Pfam:PF00657.Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
PLATELET-ACTIVATING FACTOR ACETYLHYDROLASE

InterPro: Protein Family Classification InterPro Database Homepage

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

ChainsEnzyme NameDescriptionCatalytic Residues
1-alkyl-2-acetylglycerophosphocholine esterase  M-CSA #94

2-acetyl-1-alkylglycerophosphocholine esterase, also known as known as platelet-activating factor acetylhydrolase (PAF-AH).

Mammalian brain contains significant levels of platelet activating-factor (PAF), these act as a synapse messenger and transcription inducer of the early response genes c-fos and c-jun. The platelet-activating factor PAF is a potent lipid first messenger active in general cell activation, fertilisation, inflammatory and allergic reactions, asthma, HIV pathogenesis, carcinogenesis, and apoptosis. PAF has also been implicated as a messenger in long-term potentiation, a cellular model of memory formation.

Inactivation of this factor is carried out by PAF-AH, a subfamily of phospholipases A2 that remove the sn-2 acetyl group. Mammalian brain contains at least three intracellular isoforms, 1b being the best characterised. From experimentation it can be assumed that PAF-AH maintains the PAF concentration within a certain range during brain development.

The protein is an unusual G-protein like (alpha1/alpha2)beta trimer. PAF-AH is a heterotrimer composed of 26-,26-, and 45-Kda polypeptides. The alpha (26KDa) is the catalytic subunit. The active site is made up of a trypsin-like triad of Ser 47, His 195 and Asp 192. The other subunit is not essential for the catalytic activity. The catalytic subunit contains a single alpha/beta domain with a central, parallel, 6-stranded beta sheet. This fold is very like that found in GTPase. Experimental data has demonstrated that the catalytic subunit of brain PAF acetylhydrolase is a novel type of serine esterase.

Defined by 5 residues: SER:A-47GLY:A-74ASN:A-104ASP:A-192HIS:A-195
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