The role of the guanine nucleotide-binding protein G alpha-s subunit (G alpha-s) (Kozasa T et al, 1988) is to activate adenylate cyclase, which, in turn, produces cAMP, which, in turn, activates cAMP-dependent protein kinase.
Feldman, DS, Luttrell, LM, Pierce, KL, Kelly, F, Koch, WJ, Rapacciuolo, A, Miller, WE, Zamah, AM, Rockman, HA
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