FEATURES

FAMILY

DESCRIPTION

Also known as PA1B3_BOVIN, PAFAH1B3, PAFAHG. Alpha1 catalytic subunit of the cytosolic type I platelet-activating factor (PAF) acetylhydrolase (PAF-AH (I)) heterotetrameric enzyme that catalyzes the hydrolyze of the acetyl group at the sn-2 position of PAF and its analogs and modulates the action of PAF (PubMed:10542206). The activity and substrate specificity of PAF-AH (I) are affected by its subunit composition (PubMed:10542206). Both alpha1/alpha1 homodimer (PAFAH1B3/PAFAH1B3 homodimer) and alpha1/alpha2 heterodimer(PAFAH1B3/PAFAH1B2 heterodimer) hydrolyze 1-O-alkyl-2-acetyl-sn-glycero-3-phosphoric acid (AAGPA) more efficiently than PAF, but they have little hydrolytic activity towards 1-O-alkyl-2-acetyl-sn-glycero-3-phosphorylethanolamine (AAGPE) (PubMed:10542206). Plays an important role during the development of brain. Forms a catalytic dimer which is either homodimer (alpha1/alpha1 homodimer) or heterodimer with PAFAH1B2 (alpha1/alpha2 heterodimer) (PubMed:10542206). Component of the cytosolic (PAF-AH (I)) heterotetrameric enzyme, which is composed of PAFAH1B1 (beta), PAFAH1B2 (alpha2) and PAFAH1B3 (alpha1) subunits (PubMed:10542206). The catalytic activity of the enzyme resides in the alpha1 (PAFAH1B3) and alpha2 (PAFAH1B2) subunits, whereas the beta subunit (PAFAH1B1) has regulatory activity (PubMed:10542206). Trimer formation is not essential for the catalytic activity (PubMed:10542206). Interacts with VLDLR; this interaction may modulate the Reelin pathway (By similarity).

EXTERNAL LINKS

PAFAH1B3

Mutations

Mutation(s) distribution

Mutations table