G protein

(redirected from Guanine nucleotide binding proteins)
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G protein

A cellular protein activated by the binding of an intercellular signal to its receptor on the cell membrane; the G-protein then activates the enzyme adenyl cyclase within the cell, triggering the formation of cyclic AMP and a stereotyped response.
See also: protein

G protein

a regulatory protein which becomes activated when bound to GTP and is involved in signal transduction.

G protein coupled receptor
a member of a large class of cell-surface signaling receptors that contain seven transmembrane a helices; ligand binding results in activation of a coupled trimeric G protein that then initiates intracellular signal transduction pathways.
References in periodicals archive ?
Isoflurane preconditions myocardium against infarction via activation of inhibitory guanine nucleotide binding proteins.
Halothane interaction with guanine nucleotide binding proteins in mouse heart.
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