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Keeping G Proteins at Bay: A Complex Between G Protein-Coupled Receptor Kinase 2 and Gß
David T. Lodowski,1Julie A. Pitcher,2W. Darrell Capel,3Robert J. Lefkowitz,3John J. G. Tesmer1*
The phosphorylation of heptahelical receptors by heterotrimericguanine nucleotidebinding protein (G protein)coupledreceptor kinases (GRKs) is a universal regulatory mechanismthat leads to desensitization of G protein signaling and tothe activation of alternative signaling pathways.We determinedthe crystallographic structure of bovine GRK2 in complex withG protein ß12 subunits.Our results show how the threedomains of GRK2the RGS (regulator of G protein signaling)homology, protein kinase, and pleckstrin homology domainsintegratetheir respective activities and recruit the enzyme to the cellmembrane in an orientation that not only facilitates receptorphosphorylation, but also allows for the simultaneous inhibitionof signaling by G and Gß subunits.
1 Institute for Cellular and Molecular Biology, Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, TX 78712, USA. 2 MRC Laboratory for Molecular and Cell Biology and Cell Biology Unit, Department of Pharmacology, University College London, Gower Street, London WC1E 6BT, UK. 3 Howard Hughes Medical Institute, Departments of Medicine and Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.
* To whom correspondence should be addressed. E-mail: tesmer{at}mail.utexas.edu
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