Abstract
SIGNAL transduction by G-protein-coupled receptors is regulated by various mechanisms acting at the receptor level; those studied most thoroughly are from the β-adrenergic receptor/Gs/adenylyl cyclase system1–3. We report here a regulatory mechanism occurring at the level of the G proteins themselves. A protein with Mr 33,000 that inhibits Gs-GTPase activity was purified from bovine brain. This protein is very similar or identical to phosducin, a protein previously thought to be specific for retina and pineal gland4–8. Recombinant phosducin inhibited the GTPase activity of several G proteins, and also inhibited Gs-mediated adenylyl cyclase activation. Blockade of its inhibitory effects by protein kinase A suggests that phosducin may be part of a complex regulatory network controlling G-protein-mediated signalling.
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Bauer, P., Müller, S., Puzicha, M. et al. Phosducin is a protein kinase A-regulated G-protein regulator. Nature 358, 73–76 (1992). https://doi.org/10.1038/358073a0
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DOI: https://doi.org/10.1038/358073a0
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