7f4f
From Proteopedia
Cryo-EM structure of afamelanotide-bound melanocortin-1 receptor in complex with Gs protein and scFv16
Structural highlights
DiseaseMSHR_HUMAN Familial melanoma;Oculocutaneous albinism type 2. Disease susceptibility is associated with variants affecting the gene represented in this entry. FunctionC562_ECOLX Electron-transport protein of unknown function.MSHR_HUMAN Receptor for MSH (alpha, beta and gamma) and ACTH (PubMed:11442765, PubMed:11707265, PubMed:1325670, PubMed:1516719, PubMed:8463333). The activity of this receptor is mediated by G proteins which activate adenylate cyclase (PubMed:11707265, PubMed:1325670, PubMed:16463023, PubMed:19737927). Mediates melanogenesis, the production of eumelanin (black/brown) and phaeomelanin (red/yellow), via regulation of cAMP signaling in melanocytes (PubMed:31097585).[1] [2] [3] [4] [5] [6] [7] [8] Publication Abstract from PubMedMelanocortins are peptide hormones critical for the regulation of stress response, energy homeostasis, inflammation, and skin pigmentation. Their functions are mediated by five G protein-coupled receptors (MC1R-MC5R), predominately through the stimulatory G protein (Gs). MC1R, the founding member of melanocortin receptors, is mainly expressed in melanocytes and is involved in melanogenesis. Dysfunction of MC1R is associated with the development of melanoma and skin cancer. Here we present three cryo-electron microscopy structures of the MC1R-Gs complexes bound to endogenous hormone alpha-MSH, a marketed drug afamelanotide, and a synthetic agonist SHU9119. These structures reveal the orthosteric binding pocket for the conserved HFRW motif among melanocortins and the crucial role of calcium ion in ligand binding. They also demonstrate the basis of differential activities among different ligands. In addition, unexpected interactions between MC1R and the Gbeta subunit were discovered from these structures. Together, our results elucidate a conserved mechanism of calcium-mediated ligand recognition, a specific mode of G protein coupling, and a universal activation pathway of melanocortin receptors. Structural mechanism of calcium-mediated hormone recognition and Gbeta interaction by the human melanocortin-1 receptor.,Ma S, Chen Y, Dai A, Yin W, Guo J, Yang D, Zhou F, Jiang Y, Wang MW, Xu HE Cell Res. 2021 Oct;31(10):1061-1071. doi: 10.1038/s41422-021-00557-y. Epub 2021 , Aug 27. PMID:34453129[9] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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Categories: Homo sapiens | Large Structures | Synthetic construct | Chen Y | Dai A | Guo J | Jiang Y | Ma S | Wang M-W | Xu HE | Yang D | Yin W | Zhou F
