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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1982 Dec;79(24):7679–7683. doi: 10.1073/pnas.79.24.7679

The cAMP-binding domains of the regulatory subunit of cAMP-dependent protein kinase and the catabolite gene activator protein are homologous.

I T Weber, K Takio, K Titani, T A Steitz
PMCID: PMC347411  PMID: 6296845

Abstract

Comparison of the recently determined amino acid sequences of the regulatory subunit of cAMP-dependent protein kinase (RII) from bovine cardiac muscle and the Escherichia coli catabolite gene activator protein (CAP) shows significant homology. This homology extends over most of the amino-terminal domain in CAP and is particularly good for the region of the beta-roll structure. The RII sequence contains two adjacent and internally homologous regions, both of which have high resemblance to the cAMP-binding domain in CAP. This suggests that the protein kinase regulatory subunit contains two cAMP-binding domains in the carboxyl-terminal region, each having a beta-roll structure similar to that in CAP. The cAMP molecule is expected to bind to the RII within a pocket formed by residues from the beta-roll, as is the case with CAP. One cAMP molecule would interact with residues from about 163 to 220, and the other cAMP would interact with amino acids in the stretch 285-350 of the RII protein kinase sequence. As the carboxyl-terminal domain of CAP shows homologies to the DNA-binding domains of other regulatory proteins, the protein appears to be of modular construction: a DNA-binding domain joined to a cAMP-binding domain.

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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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