Adenylate cyclase (AC)

activation of G protein, binding of GTP, activation of adenylate cyclase, conversion of ATP to cAMP

Activation of G protein, binding of GTP, activation of adenylate cyclase, conversion of ATP to cAMP

protein kinase

"When adenylyl cyclase is activated, it catalyses the conversion of ATP to cyclic AMP, which leads to an increase in intracellular levels of cyclic AMP. Cyclic AMP functions as a "http://wiki.answers.com/../pathphys/endocrine/moaction/surface.html" to relay extracellular signals to intracellular effectors, particularly http://wiki.answers.com/pka.html. "