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Structural determinants of calmodulin binding to the intracellular C-terminal domain of the metabotropic glutamate receptor 7A

By Astrid Scheschonka, Stuart C. Findlow, Rudolf Schemm, Oussama El Far, John H. Caldwell, Matthew P. Crump, Kate Holden-Dye, Vincent O'Connor, Heinrich Betz and Jorn M. Werner

Abstract

Calmodulin (CaM) binds in a Ca2+-dependent manner to the intracellular C-terminal domains of most group III metabotropic glutamate receptors (mGluRs). Here we combined mutational and biophysical approaches to define the structural basis of CaM binding to mGluR 7A. Ca2+/CaM was found to interact with mGluR 7A primarily via its C-lobe at a 1:1 CaM:C-tail stoichiometry. Pulldown experiments with mutant CaM and mGluR 7A C-tail constructs and high resolution NMR with peptides corresponding to the CaM binding region of mGluR 7A allowed us to define hydrophobic and ionic interactions required for Ca2+/CaM binding and identified a 1-8-14 CaM-binding motif. The Ca2+/CaM·mGluR 7A peptide complex displays a classical wraparound structure that closely resembles that formed by Ca2+/CaM upon binding to smooth muscle myosin light chain kinase. Our data provide insight into how Ca2+/CaM regulates group III mGluR signaling via competition with intracellular proteins for receptor-binding sites

Topics: QH301
Year: 2008
OAI identifier: oai:eprints.soton.ac.uk:143015
Provided by: e-Prints Soton

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