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Kang, Yanyong; Zhou, X Edward; Gao, Xiang; He, Yuanzheng; Liu, Wei; Ishchenko, Andrii; Barty, Anton; White, Thomas A; Yefanov, Oleksandr; Han, Gye Won; Xu, Qingping; de Waal, Parker W; Ke, Jiyuan; Tan, M H Eileen; Zhang, Chenghai; Moeller, Arne; West, Graham M; Pascal, Bruce D; Van Eps, Ned; Caro, Lydia N; Vishnivetskiy, Sergey A; Lee, Regina J; Suino-Powell, Kelly M; Gu, Xin; Pal, Kuntal; Ma, Jinming; Zhi, Xiaoyong; Boutet, Sébastien; Williams, Garth J; Messerschmidt, Marc; Gati, Cornelius; Zatsepin, Nadia A; Wang, Dingjie; James, Daniel; Basu, Shibom; Roy-Chowdhury, Shatabdi; Conrad, Chelsie E; Coe, Jesse; Liu, Haiguang; Lisova, Stella; Kupitz, Christopher; Grotjohann, Ingo; Fromme, Raimund; Jiang, Yi; Tan, Minjia; Yang, Huaiyu; Li, Jun; Wang, Meitian; Zheng, Zhong; Li, Dianfan; Howe, Nicole; Zhao, Yingming; Standfuss, Jörg; Diederichs, Kay; Dong, Yuhui; Potter, Clinton S; Carragher, Bridget; Caffrey, Martin; Jiang, Hualiang; Chapman, Henry N; Spence, John C H; Fromme, Petra; Weierstall, Uwe; Ernst, Oliver P; Katritch, Vsevolod; Gurevich, Vsevolod V; Griffin, Patrick R; Hubbell, Wayne L; Stevens, Raymond C; Cherezov, Vadim; Melcher, Karsten; Xu, H Eric
Nature (London), 07/2015, Letnik: 523, Številka: 7562Journal Article
G-protein-coupled receptors (GPCRs) signal primarily through G proteins or arrestins. Arrestin binding to GPCRs blocks G protein interaction and redirects signalling to numerous G-protein-independent pathways. Here we report the crystal structure of a constitutively active form of human rhodopsin bound to a pre-activated form of the mouse visual arrestin, determined by serial femtosecond X-ray laser crystallography. Together with extensive biochemical and mutagenesis data, the structure reveals an overall architecture of the rhodopsin-arrestin assembly in which rhodopsin uses distinct structural elements, including transmembrane helix 7 and helix 8, to recruit arrestin. Correspondingly, arrestin adopts the pre-activated conformation, with a ∼20° rotation between the amino and carboxy domains, which opens up a cleft in arrestin to accommodate a short helix formed by the second intracellular loop of rhodopsin. This structure provides a basis for understanding GPCR-mediated arrestin-biased signalling and demonstrates the power of X-ray lasers for advancing the frontiers of structural biology.
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