Which is NOT typically a step in the cAMP second-messenger system?
A)A first messenger binds to a transmembrane receptor.
B)There is dissociation of G-protein subunits.
C)An activated G-protein subunit phosphorylates cAMP-dependent protein kinase.
D)Adenylyl cyclase converts ATP into cAMP.
E)Active cAMP-dependent protein kinase phosphorylates cell proteins.

Question

Quizplus · Accepted Answer

In the cAMP second-messenger system, an activated G-protein subunit stimulates adenylyl cyclase to convert ATP into cAMP. The cAMP then activates protein kinase A, which phosphorylates cell proteins. There is no step in which an activated G-protein subunit directly phosphorylates cAMP-dependent protein kinase.

Which Is NOT Typically a Step in the CAMP Second-Messenger