The crystal structure of the β2-adrenergic receptor (β2AR) bound to the G protein adenylyl cyclase stimulatory G protein (Gs) captured the complex in a nucleotide-free state (β2AR-Gs <sup>empty </sup>). Unfortunately, the β2AR-Gs <sup>empty </sup> co ...
The crystal structure of the β2-adrenergic receptor (β2AR) bound to the G protein adenylyl cyclase stimulatory G protein (Gs) captured the complex in a nucleotide-free state (β2AR-Gs empty ). Unfortunately, the β2AR-Gs empty complex does not provide a clear explanation for G protein coupling specificity. Evidence from several sources suggests the existence of a transient complex between the β2AR and GDP-bound Gs protein (β2AR-Gs GDP ) that may represent an intermediate on the way to the formation of β2AR-Gs empty and may contribute to coupling specificity. Here we present a structure of the β2AR in complex with the carboxyl terminal 14 amino acids from Gαs along with the structure of the GDP-bound Gs heterotrimer. These structures provide evidence for an alternate interaction between the β2AR and Gs that may represent an intermediate that contributes to Gs coupling specificity.
Organizational Affiliation:
Institute for Molecular Bioscience, University of Graz, Humboldtstrasse 50/3, 8010 Graz, Austria.,Beijing Advanced Innovation Center for Structural Biology, Tsinghua-Peking Joint Center for Life Sciences, School of Medicine, Tsinghua University, Beijing 100084, China.,Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA 94305, USA.,Department of Drug Design and Pharmacology, Faculty of Medical and Health Sciences, University of Copenhagen, Copenhagen 2100, Denmark.,Advanced Photon Technology Division, Research Infrastructure Group, SR Life Science Instrumentation Unit, RIKEN/SPring-8 Center, 1-1-1 Kouto Sayo-cho Sayo-gun, Hyogo 679-5148, Japan; Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.,Beijing Advanced Innovation Center for Structural Biology, Tsinghua-Peking Joint Center for Life Sciences, School of Medicine, Tsinghua University, Beijing 100084, China; Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA 94305, USA. Electronic address: kobilka@stanford.edu.,Institute of Medical Physics and Biophysics, Charité Medical University Berlin, Berlin 10117, Germany; Institute of Medical Physics and Biophysics, Faculty of Medicine, University Leipzig, Leipzig 04107, Germany.,Institute of Medical Physics and Biophysics, Charité Medical University Berlin, Berlin 10117, Germany.,Beijing Advanced Innovation Center for Structural Biology, Tsinghua-Peking Joint Center for Life Sciences, School of Medicine, Tsinghua University, Beijing 100084, China. Electronic address: liu_xy@mail.tsinghua.edu.cn.
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