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-Structure paper
| タイトル | Cryo-EM structures of GPR75 reveal an occluded orthosteric pocket challenging conventional drug discovery paradigms for an anti-obesity target. |
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| ジャーナル・号・ページ | Acta Pharmacol Sin, Year 2026 |
| 掲載日 | 2026年1月16日 |
著者 | Zi-Ning Zhu / Chong-Zhao You / Qing-Ning Yuan / Jiu-Yin Xu / Zong-Yue Gu / Zheng Huang / Miao Liu / Bei Shan / James Jiqi Wang / Wen Hu / Kai Wang / Wan-Chao Yin / You-Wei Xu / H Eric Xu / Can-Rong Wu / ![]() |
| PubMed 要旨 | The global obesity epidemic, affecting over 650 million adults, demands innovative therapeutics. GPR75 has emerged as a promising anti-obesity target, with genetic evidence linking loss-of-function ...The global obesity epidemic, affecting over 650 million adults, demands innovative therapeutics. GPR75 has emerged as a promising anti-obesity target, with genetic evidence linking loss-of-function variants to protection against obesity and type 2 diabetes. However, structural insights have remained elusive due to GPR75's inherent expression and stabilization challenges. Here we present the cryo-EM structures of human GPR75 in apo and Gq-coupled states, achieved through advanced stabilization techniques including NanoBiT and molecular glue approaches. Our structures reveal unique architectural features: a completely collapsed extracellular domain eliminates the traditional orthosteric binding pocket, raising critical questions about previously reported small molecule ligands. GPR75 assumes active-like conformation in both apo and G protein complexed structures through unique molecular switches-the canonical DRY motif is replaced by HRL, abolishing the ionic lock, while a distinctive Lys134-Asp210 salt bridge stabilizes the active conformation without ligand binding. This dramatic structural divergence from conventional GPCRs necessitates alternative therapeutic strategies targeting allosteric sites or protein-protein interactions rather than orthosteric pockets. Our findings establish a crucial structural framework for developing next-generation anti-obesity therapeutics. |
リンク | Acta Pharmacol Sin / PubMed:41545757 |
| 手法 | EM (単粒子) |
| 解像度 | 2.87 - 3.91 Å |
| 構造データ | ![]() EMDB-67108: Cryo-EM structure of Receptor of GPR75 ![]() EMDB-67109: The cryo_EM structure of GPR75 complex EMDB-67110, PDB-9xqc: EMDB-67119, PDB-9xqn: |
| 化合物 | ![]() ChemComp-HOH: |
| 由来 |
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キーワード | MEMBRANE PROTEIN/IMMUNE SYSTEM / GPCR / GPR75 / MEMBRANE PROTEIN-IMMUNE SYSTEM complex |
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