粘附GPCRsADGRG2和ADGRG4的绑定激活机制
Peng Xiao1,2,3, Shengchao Guo3, Xin Wen3
1Department of Clinical Laboratory, The Second Hospital, and Advanced Medical Research Institute, Cheeloo College of Medicine, Shandong University, Jinan, China.
Nature
|April 14, 2022
概括
粘附G蛋白合受体 (aGPCR) 通过结合的Stachel序列激活,由冷EM结构揭示. 这种机制有助于设计这些古老受体的新激动剂和抗剂.
科学领域:
- 结构生物学
- 分子细胞生物学
- 生物化学
背景情况:
- 粘附G蛋白合受体 (aGPCR) 是古老的细胞表面受体.
- aGPCRs经常经历自蛋白解,产生α和β子单元.
- 通过β子单元的Stachel序列连接的激进作用与aGPCR激活有关.
研究的目的:
- 通过绑定的Stachel序列介导的aGPCR激活的结构基础.
- 调查Stachel序列与七跨膜 (7TM) 域的相互作用.
- 为GPCR向性激素和抗剂的合理设计提供见解.
主要方法:
- 通过冷电子显微镜 (cryo-EM) 确定了三个结构.
- 结构包括aGPCRs (ADGRG2,ADGRG4) 与Gs异构体复合.
- 复合物包括内源性Stachel序列或合成激动剂 (IP15).
主要成果:
- 化EM结构显示了深深插入7TM捆的U形Stachel序列.
- 斯塔克尔序列的FXφXφ动机作为"手指"介导受体结合和激活.
- ADGRG2 ((FL) -IP15-Gs的结构解释了IP15的增强结合亲和力,并指导了对抗剂的设计.
- 通过修改"指残留物"来产生抗体的方法.
结论:
- 结构和生化数据为aGPCRs的绑定激活机制提供了关键的见解.
- 这些发现有助于合理设计基于的aGPCR激活剂和抗剂.
- 这项工作有助于我们更好地了解aGPCR信号传递和治疗潜力.
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