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. 1985 Sep;82(17):5732–5736. doi: 10.1073/pnas.82.17.5732

Amino acid sequence of the heat-stable inhibitor of the cAMP-dependent protein kinase from rabbit skeletal muscle.

J D Scott, E H Fischer, K Takio, J G Demaille, E G Krebs
PMCID: PMC390626  PMID: 3898070

Abstract

The amino acid sequence of rabbit skeletal muscle heat-stable inhibitor of the cAMP-dependent protein kinase has been determined by microsequencing techniques. Proof of the structure involved a series of nonoverlapping tryptic fragments for primary identification of 86% of the amino acids. Complementary fragments generated by cleavage with chymotrypsin, Staphylococcus aureus V8 proteinase, and mast cell proteinase II contributed to proof of the structure. The inhibitor is a single polypeptide chain of 75 residues and has a molecular weight of 7829. It lacks tryptophan, proline, and sulfur-containing amino acids. The amino terminus of the inhibitor is blocked by an unidentified group. The amino-terminal region of the molecule contains the kinase inhibitory domain, and synthetic peptides based on the sequence of residues 11-30 are potent competitive inhibitors of the cAMP-dependent protein kinase [Scott, J. D., Fischer, E. H., Demaille, J. G. & Krebs, E. G. (1985) Proc. Natl. Acad. Sci. USA 82, 4379-4383]. Residues 14-22 show considerable homology to the "hinge-regions" of the regulatory subunits of the cAMP-dependent protein kinase. The remainder of the molecule shows no similarity to the known amino acid sequence of any protein.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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