PKI PKAInhibitor (5-24) is a synthetic peptide inhibitor of PKA (cAMP-dependent protein kinase) (Ki= 2.3 nM) derived from the active site of the skeletal muscle inhibitor protein.1It mimics the protein substrate by binding to the catalytic site through the arginine-cluster basic subsite.1The prominent enzyme-substrate interaction site occurs where PKA catalytic subunit residues Tyr235and Phe239form a sandwich-like structure with residue Phe10of PKI (5-24).2
Sp-cAMPS sodium salt 作为 cAMP 类似物,是一种依赖 cAMP 的PKA I 和PKA II 的有效激活剂。Sp-cAMPS sodium salt 还是一种有效的竞争性磷酸二酯酶 (PDE3A) 抑制剂,Ki 为 47.6 μM。Sp-cAMPS sodium salt 结合PDE10 GAF 结构域,EC50为 40 μM 。