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一个LGR二聚体的结构,是糖蛋白激素受体的进化前身
Zhen Gong1, Shuobing Chen1,2, Ziao Fu1,3
1Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, USA.
Nature communications
|November 29, 2025
概括
糖蛋白激素受体 (GpHRs) 作为二聚体而不是单聚体而起作用. 对C. elegans同类菌的结构分析揭示了一种不对称的二元体,能够结合一种激素,与甲状腺刺激激素受体 (TSHR) 复合体中已知的负合作性保持一致.
科学领域:
- 内分泌学 在内分泌学.
- 结构生物学 结构生物学
- 分子药理学分子药理学
背景情况:
- 糖蛋白激素 (GpHs) 和它们的受体 (GpHRs) 调节生殖和新陈代谢.
- GpHRs是与G蛋白结合的受体,它们作为二元体起作用,尽管单独观察到的单体结构.
- 了解GpHR结构对于破译激素-配体相互作用和信号传递至关重要.
研究的目的:
- 描述来自Caenorhabditis elegans的同源糖蛋白激素受体的结构和生化特性.
- 为了研究受体的二维状态和激素结合能力.
- 为GpHR功能和共同进化的结构基础提供见解.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定C. elegans GpHR的结构.
- 生物化学测试以评估受体特性.
- 计算建模以探索潜在的二维配置和激素结合.
主要成果:
- 在C. elegans GpHR形成一个不对称的二元体,与原体由142°/4.1 Å螺丝转换相关.
- 这种不对称的结构只容纳一个激素结合点,与TSHR复合体中观察到的负合作性一致.
- 建模表明,一个对称的二倍体可以结合两个激素,支持G蛋白切换机制.
结论:
- 这项研究揭示了GpHR的不对称二维结构,挑战了之前的单体观测.
- 这些发现支持了GpHR信号中负面合作和交易的模型.
- 这项工作为理解GpHR演变和功能提供了一个结构框架.
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