A novel mechanism of PKA anchoring revealed by solution structures of anchoring complexes

Marceen G. Newlon, Melinda Roy, Dimitrios Morikis, Daniel W. Carr, Ryan Westphal, John D. Scott, Patricia A. Jennings

Research output: Contribution to journalArticle

163 Scopus citations

Abstract

The specificity of intracellular signaling events is controlled, in part, by compartmentalization of protein kinases and phosphatases. The subcellular localization of these enzymes is often maintained by protein-protein interactions. A prototypic example is the compartmentalization of the cAMP-dependent protein kinase (PKA) through its association with A-kinase anchoring proteins (AKAPs). A docking and dimerization domain (D/D) located within the first 45 residues of each regulatory (R) subunit protomer forms a high affinity binding site for its anchoring partner. We now report the structures of two D/D-AKAP peptide complexes obtained by solution NMR methods, one with Ht31(493-515) and the other with AKAP79(392-413). We present the first direct structural data demonstrating the helical nature of the peptides. The structures reveal conserved hydrophobic interaction surfaces on the helical AKAP peptides and the PKA R subunit, which are responsible for mediating the high affinity association in the complexes. In a departure from the dimer-dimer interactions seen in other X-type four-helix bundle dimeric proteins, our structures reveal a novel hydrophobic groove that accommodates one Akap per RIIα D/D.

Original languageEnglish (US)
Pages (from-to)1651-1662
Number of pages12
JournalEMBO Journal
Volume20
Issue number7
DOIs
StatePublished - Apr 2 2001

Keywords

  • AKAP
  • NMR
  • PKA
  • Signal transduction
  • Subcellular localization

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

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    Newlon, M. G., Roy, M., Morikis, D., Carr, D. W., Westphal, R., Scott, J. D., & Jennings, P. A. (2001). A novel mechanism of PKA anchoring revealed by solution structures of anchoring complexes. EMBO Journal, 20(7), 1651-1662. https://doi.org/10.1093/emboj/20.7.1651