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| The EMBO Journal
(2001) 20, 1651–1662, doi:10.1093/emboj/20.7.1651 |
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| A novel mechanism of PKA anchoring revealed by solution structures of anchoring complexes |
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| Marceen G. Newlon2, Melinda Roy1, Dimitrios Morikis1, Daniel W. Carr3, Ryan Westphal4, John D. Scott4 and Patricia A. Jennings1 |
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1 The Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0359, USA 2 Present address: The Department of Pharmacology, University of California, San Diego, La Jolla, CA 92093, USA 3 VA Medical Center, R&D-8, 3710 S.W. Veterans Hospital Road, Portland, OR 97201 USA 4 Howard Hughes Medical Institute, Vollum Institute, 3181 S.W. Sam Jackson Park Road, Portland, OR, USA To whom correspondence should be addressed Patricia A. Jennings, pajennin@ucsd.edu Received 18 December 2000; Accepted 7 February 2001. |
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| Abstract |
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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 RII D/D. |
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| Keywords: AKAP, PKA, NMR, signal transduction, subcellular localization |
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