phosphoinositide-3-kinase, catalytic, gamma polypeptide; 3-phosphorylates the cellular phosphoinositide PtdIns- 4,5-biphosphate (PtdIns(4,5)P2) to produce PtdIns-3, 4,5- triiphosphate (PtdIns(3,4,5)P3). Links G-protein coupled receptor activation to the secondary messenger PtdIns(3,4,5)P3 production (1112 aa)