对糖蛋白激素及其受体的功能进行结构和进化见解
Wayne A Hendrickson1,2, Zhen Gong1
1Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York, USA.
Andrology
|January 28, 2025
概括
糖蛋白激素 (GpHs) 及其含有丰富的白素的重复含有G蛋白合受体 (LGRs) 对繁殖至关重要. 对C. elegans LGR二分体的结构分析提供了对人类GpH受体二分化和信号机制的见解.
科学领域:
- 内分泌学 在内分泌学.
- 结构生物学 结构生物学
- 进化生物学 进化生物学
背景情况:
- 神经内分泌系统依赖于糖蛋白激素 (GpHs) 和它们的G蛋白合受体 (GPCRs),称为含有LRR的GPCR (LGRs),用于繁殖和新陈代谢.
- 这些受体具有用于激素结合的氨酸丰富重复 (LRR) 细胞外域和用于信号传递的A类GPCR跨膜域.
- 脊椎动物的GpHs和LGRs是从早期元动物的同类物进化而来的,无脊椎动物的LGRs就像Caenorhabditis elegans中的LGRs一样,代表了人类受体的进化前身,例如FSH受体.
研究的目的:
- 了解GpH-LGR信号的进化起源和结构基础.
- 研究受体二分化在GpH信号传递中的作用,特别是在人类受体中.
主要方法:
- 使用X射线晶体学和冷电子显微镜 (cryo-EM) 来确定人类GpH及其受体的原子结构.
- 从C. elegans中对二面LGR进行了结构分析.
- 在人类和C. elegans LGR结构之间进行了比较结构分析.
主要成果:
- 原子结构揭示了单质的人类GpH受体,尽管有证据表明在信号传输中具有二维重要性.
- 这种C. elegans的LGR存在于一个稳定的二元体中.
- 结构比较表明,人类gpH受体具有功能相关的二维关联的假设模型.
结论:
- C. elegans LGR 的二度结构为理解人类 GpH 受体二度化提供了一个潜在的模型.
- 这种结构洞察力可以阐明信号传输的机制,从荷尔蒙结合到细胞内反应.
- 对人类GpH受体二分化进行进一步的研究是有必要的,以充分理解它们的信号通路.
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