Inactive ■ cAMP-dependent protein kinase
Table 74-2 shows a few of the many hormones that use the adenylyl cyclase-cAMP mechanism to stimulate their target tissues, and Figure 74-7 shows the adenylyl cyclase-cAMP second messenger system itself. Binding of the hormones with the receptor allows coupling of the receptor to a G protein. If the G protein stimulates the adenylyl cyclase-cAMP system, it is called a Gs protein, denoting a stimulatory G protein. Stimulation of adenylyl cyclase, a membrane-bound enzyme, by the Gs protein then catalyzes
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