Glutamic acid 203 of the cAMP-dependent protein kinase catalytic subunit participates in the inhibition by two isoforms of the protein kinase inhibitor.

Abstract excerpt

Although the protein kinase inhibitors (PKIs) are known to be potent and specific inhibitors of the catalytic (C) subunit of cAMP-dependent protein kinase, little is known about their physiological roles. Glutamate 203 of the C alpha isoform (C alpha E203) has been implicated in the binding of the arginine 15 residue of the skeletal isoform of PKI (PKI alpha R15) (Knighton, D. R., Zheng, J., Ten Eyck, L. F.,...

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