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. 1992 Aug 7;70(3):411-8.
doi: 10.1016/0092-8674(92)90165-9.

Phospholipase C-beta 1 is a GTPase-activating protein for Gq/11, its physiologic regulator

G Berstein  1 , J L Blank, D Y Jhon, J H Exton, S G Rhee, E M Ross
Affiliations

Phospholipase C-beta 1 is a GTPase-activating protein for Gq/11, its physiologic regulator

G Berstein et al. Cell. .

Abstract

Purified M1 muscarinic cholinergic receptor and Gq/11 were coreconstituted in lipid vesicles. Addition of purified phospholipase C-beta 1 (PLC-beta 1) further stimulated the receptor-promoted steady-state GTPase activity of Gq/11 up to 20-fold. Stimulation depended upon receptor-mediated GTP-GDP exchange. Addition of PLC-beta 1 caused a rapid burst of hydrolysis of Gq/11-bound GTP that was at least 50-fold faster than in its absence. Thus, PLC-beta 1 stimulates hydrolysis of Gq/11-bound GTP and acts as a GTPase-activating protein (GAP) for its physiologic regulator, Gq/11. GTPase-stimulating activity was specific both for PLC-beta 1 and Gq/11. Such GAP activity by an effector coupled to a trimeric G protein can reconcile slow GTP hydrolysis by pure G proteins in vitro with fast physiologic deactivation of G protein-mediated signaling.

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