The heterotrimeric G protein subunits Gα(q) and Gβ(1) have lysophospholipase D activity.

ABSTRACT: In a previous study we purified a novel lysoPLD (lysophospholipase D) which converts LPC (lysophosphatidylcholine) into a bioactive phospholipid, LPA (lysophosphatidic acid), from the rat brain. In the present study, we identified the purified 42 and 35 kDa proteins as the heterotrimeric G protein subunits Gα(q) and Gβ(1) respectively. When FLAG-tagged Gα(q) or Gβ(1) was expressed in cells and purified, significant lysoPLD activity was observed in the microsomal fractions. Levels of the hydrolysed product choline increased over time, and the Mg(2+) dependency and substrate specificity of Gα(q) were similar to those of lysoPLD purified from the rat brain. Mutation of Gα(q) at amino acids Lys(52), Thr(186) or Asp(205), residues that are predicted to interact with nucleotide phosphates or cat

SUBMITTER: Aoyama C 

PROVIDER: S-EPMC3215285 | biostudies-literature | 2011 Dec

REPOSITORIES: biostudies-literature