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Publication Abstract from PubMed

The human glucagon receptor, GCGR, belongs to the class B G-protein-coupled receptor family and plays a key role in glucose homeostasis and the pathophysiology of type 2 diabetes. Here we report the 3.0 A crystal structure of full-length GCGR containing both the extracellular domain and transmembrane domain in an inactive conformation. The two domains are connected by a 12-residue segment termed the stalk, which adopts a beta-strand conformation, instead of forming an alpha-helix as observed in the previously solved structure of the GCGR transmembrane domain. The first extracellular loop exhibits a beta-hairpin conformation and interacts with the stalk to form a compact beta-sheet structure. Hydrogen-deuterium exchange, disulfide crosslinking and molecular dynamics studies suggest that the stalk and the first extracellular loop have critical roles in modulating peptide ligand binding and receptor activation. These insights into the full-length GCGR structure deepen our understanding of the signalling mechanisms of class B G-protein-coupled receptors.

Structure of the full-length glucagon class B G-protein-coupled receptor.,Zhang H, Qiao A, Yang D, Yang L, Dai A, de Graaf C, Reedtz-Runge S, Dharmarajan V, Zhang H, Han GW, Grant TD, Sierra RG, Weierstall U, Nelson G, Liu W, Wu Y, Ma L, Cai X, Lin G, Wu X, Geng Z, Dong Y, Song G, Griffin PR, Lau J, Cherezov V, Yang H, Hanson MA, Stevens RC, Zhao Q, Jiang H, Wang MW, Wu B Nature. 2017 Jun 8;546(7657):259-264. doi: 10.1038/nature22363. Epub 2017 May 17. PMID:28514451^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.