阶段性质子传感介导的GPCR激活的结构基础
Xiaolei Yue1,2, Li Peng1,2, Shenhui Liu1,2
1iHuman Institute, ShanghaiTech University, Shanghai, China.
Cell research
|April 10, 2025
概括
这项研究揭示了像GPR4和GPR65这样的pH感应G蛋白结合受体 (GPCR) 的结构机制,详细说明了它们如何检测酸度和激活. 这些发现为与pH相关的疾病提供了新的治疗点.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子药理学分子药理学
背景情况:
- pH平衡对于生物功能至关重要.
- 像GPR4,GPR65和GPR68这样的pH感应G蛋白合受体 (GPCR) 是细胞pH的关键调节者.
- 这些GPCRs的精确质子感应机制在很大程度上是未知的.
研究的目的:
- 阐明GPR4和GPR65.5中质子感应和激活机制的结构基础.
- 了解细胞外环和特定残留物在pH检测中的作用.
- 为通过pH变化触发的GPCR激活提供原子层面的洞察力.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定GPR4和GPR65.5的结构.
- 在各种pH水平上与Gs,Gq或G13蛋白质复合的受体的结构分析.
- GPR4与小分子NE52-QQ57.5的共同结晶.
主要成果:
- GPR4和GPR65的详细结构揭示了动态的细胞外循环2形状.
- 通过细胞外的histidine和carboxylic acid残留的网络阐明了质子感应机制.
- 在GPR4.4上确定部分活性中间状态和独特的全性NE52-QQ57结合位点.
结论:
- 为逐步的质子感应和GPCR激活提出了一个全面的原子模型.
- 结构性见解为开发针对pH感应GPCRs的新疗法提供了基础.
- 了解这些机制对于治疗与异常pH感应相关的疾病至关重要.
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