The structure of iPLA₂β reveals dimeric active sites and suggests mechanisms of regulation and localization.

ABSTRACT: Calcium-independent phospholipase A₂β (iPLA₂β) regulates important physiological processes including inflammation, calcium homeostasis and apoptosis. It is genetically linked to neurodegenerative disorders including Parkinson's disease. Despite its known enzymatic activity, the mechanisms underlying iPLA₂β-induced pathologic phenotypes remain poorly understood. Here, we present a crystal structure of iPLA₂β that significantly revises existing mechanistic models. The catalytic domains form a tight dimer. They are surrounded by ankyrin repeat domains that adopt an outwardly flared orientation, poised to interact with membrane proteins. The closely integrated active sites are positioned for cooperative activation and internal transacylation. The str

SUBMITTER: Malley KR 

PROVIDER: S-EPMC5823874 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature