Structure and function of phosphatidylserine-specific phospholipase A1

Biochim Biophys Acta. 2002 May 23;1582(1-3):26-32. doi: 10.1016/s1388-1981(02)00134-8.


Phospholipase A1 (PLA1) is an enzyme that hydrolyzes the sn-1 fatty acids from phospholipids and produces 2-acyl-lysophospholipids. Although PLA1 activities are detected in many tissues and cell lines, a limited number of PLA1s have been purified and cloned so far. These include phosphatidylserine (PS)-specific PLA1 (PS-PLA1) from rat platelets, PLA1 from vespid venom, and phosphatidic acid (PA)-preferential PLA1 (PA-PLA1). Structurally, the former two PLA1s belong to the lipase family, where they form a subfamily among the lipase family. An alignment of the PLA1s with other members of the lipase family revealed two molecular characteristics of PLA1: the presence of extremely short lids and deleted beta9 loops. The two surface loops have been implicated in the ligand recognition in human pancreatic lipase (PL) and guinea pig PL-related protein 2. Under physiological conditions, accessibility of PS-PLA1 to its substrate is limited as it is a secreted enzyme and PS is normally located in the inner leaflet of the lipid bilayer. However, PS-PLA1 efficiently hydrolyzes PS exposed on the surface of cells such as apoptotic cells and activated platelets, and produces 2-acyl-lysophosphatidylserine (lysoPS), which is a lipid mediator for mast cells, T cells and neural cells. Identification of PS-PLA1 reveals the presence of PLA1 subfamily within the lipase family and suggests that PLA1 has a role in the production of lysophospholipid mediators.

Publication types

  • Review

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Humans
  • Molecular Sequence Data
  • Phospholipases A / chemistry*
  • Phospholipases A / genetics
  • Phospholipases A / metabolism*
  • Phospholipases A1
  • Sequence Alignment
  • Sequence Homology, Amino Acid
  • Substrate Specificity


  • PLA1A protein, human
  • Phospholipases A
  • Phospholipases A1
  • Pla1a protein, rat