First Known Use: 1967
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)
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Origin of G PROTEIN
guanosine triphosphate-binding protein
Medical Dictionary
G protein
noun \ˈjē-\
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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