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The cAMP binding domain: an ancient signaling module.

Helen M Berman1, Lynn F Ten Eyck, David S Goodsell

  • 1Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854-8087, USA. berman@rcsb.rutgers.edu

Proceedings of the National Academy of Sciences of the United States of America
|December 25, 2004
PubMed
Summary

Cyclic adenosine monophosphate (cAMP) binding domains regulate protein function through structural changes. Loss of adenine interactions upon cAMP binding triggers a repositioning of the C helix, initiating allosteric signaling.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Cyclic adenosine monophosphate (cAMP) is a crucial second messenger.
  • cAMP-binding domains are prevalent recognition motifs in various proteins.
  • Understanding cAMP-protein interactions is key to deciphering cellular signaling pathways.

Purpose of the Study:

  • To investigate the structural properties and interaction mechanisms of cAMP-binding domains.
  • To elucidate the role of different cAMP components in protein recognition.
  • To propose a model for cAMP-mediated allosteric regulation.

Main Methods:

  • Systematic computational analyses were employed.
  • Structure-based sequence comparison was performed.
  • Surface matching, affinity grid analysis, and ligand-protein interaction analyses were conducted.

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Main Results:

  • Distinct roles for the sugar phosphate and adenine moieties of cAMP were identified.
  • cAMP binding leads to significant structural alterations.
  • Loss of hydrophobic interactions with the adenine ring was observed.

Conclusions:

  • The cAMP-binding module's function relies on distinct roles of its components.
  • cAMP binding induces structural changes via adenine interaction loss and C helix repositioning.
  • This repositioning facilitates protein-binding events, completing the allosteric mechanism.