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Heterotrimeric GTP-binding proteins (G proteins) regulate cellular activity by coupling to hormone or sensory receptors. Stimulated receptors catalyse the release of GDP from G protein alpha-subunits and GTP bound to the empty alpha-subunits provides signals that control effectors such as adenylyl cyclases, phosphodiesterases, phospholipases and ion(More)
The heterotrimeric guanine nucleotide binding proteins (G proteins) are activated by sensory or hormone receptors. In turn, the G proteins activate effector proteins such as adenylyl cyclase, cyclic guanosine 3',5'-monophosphate phosphodiesterase (cGMP PDE), phospholipase C, and potassium and calcium ion channels by mechanisms that are poorly understood. A(More)
The molecular basis of the interaction between the visual receptor, rhodopsin, and the rod outer segment GTP-binding protein, transducin or Gt, was studied using a synthetic-peptide-competition approach to elucidate the site(s) on the Gt alpha-subunit (alpha t) involved in high-affinity binding to light-activated rhodopsin (R*). Synthetic peptides based on(More)
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