G–protein

noun

Definition of G–protein

  1. :  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 (such as a hormone or neurotransmitter) bind to GTP to form an active complex which mediates an intracellular event (such as activation of adenylate cyclase)

Origin and Etymology of g–protein

guanosine triphosphate-binding protein


First Known Use: 1967


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