Publication Abstract from PubMed
Cytosolic phospholipase A2 initiates the biosynthesis of prostaglandins, leukotrienes, and platelet-activating factor (PAF), mediators of the pathophysiology of asthma and arthritis. Here, we report the X-ray crystal structure of human cPLA2 at 2.5 A. cPLA2 consists of an N-terminal calcium-dependent lipid-binding/C2 domain and a catalytic unit whose topology is distinct from that of other lipases. An unusual Ser-Asp dyad located in a deep cleft at the center of a predominantly hydrophobic funnel selectively cleaves arachidonyl phospholipids. The structure reveals a flexible lid that must move to allow substrate access to the active site, thus explaining the interfacial activation of this important lipase.
Crystal structure of human cytosolic phospholipase A2 reveals a novel topology and catalytic mechanism.,Dessen A, Tang J, Schmidt H, Stahl M, Clark JD, Seehra J, Somers WS Cell. 1999 Apr 30;97(3):349-60. PMID:10319815[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
