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• W3154244996 abstract "SUMMARY The melanocortin-4 receptor (MC4R), a hypothalamic master regulator of energy homeostasis and appetite, is a G-protein coupled receptor and a prime target for the treatment of obesity. Here, we present cryo-electron microscopy structures of MC4R− Gs-protein complexes with two recently FDA-approved drugs, the peptide agonists NDP-α-MSH and setmelanotide, with 2.9 Å and 2.6 Å resolution. Together with signaling data, the complex structures reveal the agonist-induced origin of transmembrane helix (TM) 6 regulated receptor activation. In both structures, different ligand binding modes of NDP-α-MSH, a high-affinity variant of the endogenous agonist, and setmelanotide, an anti-obesity drug with biased signaling, underline the key role of TM3 for ligand-specific interactions and of calcium ion as a ligand-adaptable cofactor. The agonist-TM3 interplay subsequently impacts the receptor− Gs-protein interfaces, mainly at intracellular loop 2. These structures reveal mechanistic details of MC4R activation or inhibition and provide important insights into receptor selectivity that will facilitate the development of tailored anti-obesity drugs." @default.
• W3154244996 created "2021-04-26" @default.
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• W3154244996 date "2021-04-22" @default.
• W3154244996 modified "2023-10-15" @default.
• W3154244996 title "Structures of active melanocortin-4 receptor−Gs-protein complexes with NDP-α-MSH and setmelanotide" @default.
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• W3154244996 doi "https://doi.org/10.1101/2021.04.22.440868" @default.
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