NH2 腺苷酸环化酶 0 HO (adenylate cyclase,AC) OH AC OH OH ATP PPi O-CH20 0=P- OH NH2 H20 OH: PDE CAMP OH 磷酸二酯酶 AMP OHOH (phosphodiesterase,PDE)N O O CH2 O OH N N N NH2 O P OH cAMP N O O CH2 OH OH N N N NH2 P O OH P O O OH P O O OH HO ATP N O O CH2 OH OH N N N NH2 P O OH HO AMP 磷酸二酯酶 (phosphodiesterase, PDE) 腺苷酸环化酶 (adenylate cyclase,AC)