整体粘附GPCR的结构分析和构造动力学揭示了细胞外和膜外域之间的相互作用
bioRxiv : the preprint server for biology
|March 11, 2024
概括
粘附G蛋白结合受体 (aGPCRs) 使用它们的大细胞外区域 (ECR) 来信号. 这项研究揭示了ECR内的GAIN域如何连接到跨膜域,影响aGPCR激活.
科学领域:
- 结构生物学是结构生物学.
- 分子细胞生物学分子细胞生物学
- 生物化学 生物化学
背景情况:
- 粘附G蛋白结合受体 (aGPCRs) 是重要的细胞粘附分子,调节各种生理过程.
- aGPCRs的细胞外区域 (ECR),具有保存的GAIN域,与配体和机械力量相互作用以控制受体活性.
- aGPCR ECR与其七通的跨膜域 (7TM) 之间的精确通信机制尚不清楚.
研究的目的:
- 在aGPCR中阐明ECR和7TM之间的结构和动态关系.
- 调查GAIN域的构造和动态如何影响aGPCR信号传递.
- 探索调节GAIN-7TM接口的功能后果.
主要方法:
- 电子显微镜 (cryo-EM) 用于拉特罗菲林3/ADGRL3.3的高分辨率结构重建.
- 单分子Förster共振能量转移 (smFRET) 探测ECR-7TM动态.
- 使用GAIN向抗体和癌症相关突变的功能性测试.
主要成果:
- 拉特罗菲林3/ADGRL3的GAIN域被观察到与移动性受限制的膜平行方向.
- 确定了三个不同的,缓慢相互转换的FRET状态,反映了ECR-7TM的形状动态.
- 调节GAIN域或GAIN-7TM接口改变了受体信号,FRET状态和冷EM结构.
结论:
- 证明了aGPCR ECR和7TM之间的直接形状和功能合.
- 提出了一个模型,其中ECR,特别是GAIN域,调解受体激活.
- 强调GAIN-7TM接口在GPCR调节和信号传输中的重要性.
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