Dictionary

G protein

noun

Definition of G PROTEIN

:  any of a class of cell membrane proteins that are coupled to cell surface receptors and upon stimulation of the receptor by an extracellular signaling molecule (as a hormone or neurotransmitter) bind to GTP to form an active complex which mediates an intracellular event (as activation of adenylate cyclase)

Origin of G PROTEIN

guanosine triphosphate-binding protein
First Known Use: 1967

G protein

noun \ˈjē-\   (Medical Dictionary)

Medical Definition of G PROTEIN

:  any of a class of cell membrane proteins that are coupled to cell surface receptors and upon stimulation of the receptor by an extracellular molecule (as a hormone or neurotransmitter) bind to GTP to form an active complex which mediates an intracellular event (as activation of adenylate cyclase)

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