Crystal structure of the β2 adrenergic receptor-Gs protein complex

G protein-coupled receptors (GPCRs) are responsible for the majority of cellular responses to hormones and neurotransmitters as well as the senses of sight, olfaction and taste. The paradigm of GPCR signalling is the activation of a heterotrimeric GTP binding protein (G protein) by an agonist-occupi...

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Bibliographic Details
Published in:	Nature (London) 2011-07, Vol.477 (7366), p.549-555
Main Authors:	Rasmussen, Søren G F, DeVree, Brian T, Zou, Yaozhong, Kruse, Andrew C, Chung, Ka Young, Kobilka, Tong Sun, Thian, Foon Sun, Chae, Pil Seok, Pardon, Els, Calinski, Diane, Mathiesen, Jesper M, Shah, Syed T A, Lyons, Joseph A, Caffrey, Martin, Gellman, Samuel H, Steyaert, Jan, Skiniotis, Georgios, Weis, William I, Sunahara, Roger K, Kobilka, Brian K
Format:	Article
Language:	eng
Subjects:	Adrenergic beta-2 Receptor Agonists - chemistry Adrenergic beta-2 Receptor Agonists - metabolism Animals Catalytic Domain Cattle Crystallization Crystallography, X-Ray Enzyme Activation GTP-Binding Protein alpha Subunits, Gs - chemistry GTP-Binding Protein alpha Subunits, Gs - metabolism Models, Molecular Multiprotein Complexes - chemistry Multiprotein Complexes - metabolism Protein Binding Rats Receptors, Adrenergic, beta-2 - chemistry Receptors, Adrenergic, beta-2 - metabolism
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Summary:	G protein-coupled receptors (GPCRs) are responsible for the majority of cellular responses to hormones and neurotransmitters as well as the senses of sight, olfaction and taste. The paradigm of GPCR signalling is the activation of a heterotrimeric GTP binding protein (G protein) by an agonist-occupied receptor. The β(2) adrenergic receptor (β(2)AR) activation of Gs, the stimulatory G protein for adenylyl cyclase, has long been a model system for GPCR signalling. Here we present the crystal structure of the active state ternary complex composed of agonist-occupied monomeric β(2)AR and nucleotide-free Gs heterotrimer. The principal interactions between the β(2)AR and Gs involve the amino- and carboxy-terminal α-helices of Gs, with conformational changes propagating to the nucleotide-binding pocket. The largest conformational changes in the β(2)AR include a 14 Å outward movement at the cytoplasmic end of transmembrane segment 6 (TM6) and an α-helical extension of the cytoplasmic end of TM5. The most surprising observation is a major displacement of the α-helical domain of Gαs relative to the Ras-like GTPase domain. This crystal structure represents the first high-resolution view of transmembrane signalling by a GPCR.
ISSN:	0028-0836 1476-4687