National Natural Science Foundation of China (NSFC)
中国
引用
ジャーナル: Nat Commun / 年: 2025 タイトル: Structural insights into antagonist recognition by the vasopressin V2 receptor. 著者: Tianwei Zhang / Hongli Liu / Chongzhao You / Yixiao Zhang / Youwei Xu / Benxun Pan / Canrong Wu / Sanshan Jin / Yu-Ling Yin / Kai Wu / Yue Chen / Hong Sun / Yuan Si / Yangxia Tan / Wanchao ...著者: Tianwei Zhang / Hongli Liu / Chongzhao You / Yixiao Zhang / Youwei Xu / Benxun Pan / Canrong Wu / Sanshan Jin / Yu-Ling Yin / Kai Wu / Yue Chen / Hong Sun / Yuan Si / Yangxia Tan / Wanchao Yin / H Eric Xu / Dong Guo / Yi Jiang / 要旨: The vasopressin V2 receptor (V2R), a class A G protein-coupled receptor, is essential for regulating body water homeostasis. V2R antagonists have emerged as promising treatments for hyponatremia; ...The vasopressin V2 receptor (V2R), a class A G protein-coupled receptor, is essential for regulating body water homeostasis. V2R antagonists have emerged as promising treatments for hyponatremia; however, the absence of structural information for antagonist-bound V2R hampers our understanding of antagonist recognition and the targeted design of V2R antagonists. In this study, we present two cryo-electron microscopy structures of inactive V2R bound to the clinically approved antagonists tolvaptan and conivaptan. Combined with functional analyses and molecular dynamic simulations, these structures reveal distinct binding poses: tolvaptan is deeply inserted within the binding pocket, whereas conivaptan is positioned at a shallower depth. Integrated analyses further define critical pharmacophoric features governing antagonist activity and unveil a TM7 helical conformation-dependent antagonism mechanism that is distinct from classical GPCR inactivation modes. Our findings deepen understanding of antagonist recognition and antagonism of V2R, providing a foundation for the development of V2R-targeted therapies.