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The first GPCR-Gi complex structure resolved

已有 558 次阅读 2018-6-15 01:02 |个人分类:好文转载|系统分类:科研笔记

 Cryo-EM structure of human rhodopsin bound to an inhibitory G protein

Nature (2018) 

Published:13 June 2018


G-protein-coupled receptors comprise the largest family of mammalian transmembrane receptors. They mediate numerous cellular pathways by coupling with downstream signalling transducers, including the hetrotrimeric G proteins Gs (stimulatory) and Gi (inhibitory) and several arrestin proteins. The structural mechanisms that define how G-protein-coupled receptors selectively couple to a specific type of G protein or arrestin remain unknown. Here, using cryo-electron microscopy, we show that the major interactions between activated rhodopsin and Gi are mediated by the C-terminal helix of the Gi α-subunit, which is wedged into the cytoplasmic cavity of the transmembrane helix bundle and directly contacts the amino terminus of helix 8 of rhodopsin. Structural comparisons of inactive, Gi-bound and arrestin-bound forms of rhodopsin with inactive and Gs-bound forms of the β2-adrenergic receptor provide a foundation to understand the unique structural signatures that are associated with the recognition of Gs, Gi and arrestin by activated G-protein-coupled receptors.

The cryo-EM structure of the rhodopsin–G i complex.
a, b, Orthogonal views of the cryo-EM density map of the rhodopsin–G i
complex, coloured by subunits. c, d, Ribbon diagram representation of the
structure of the rhodopsin–G i complex.

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