GP64的结构转变是由一个pH敏感的多胺开关触发的
Jinliang Guo1, Shangrong Li1, Lisha Bai2
1School of Life Science and Technology, ShanghaiTech University, Shanghai, China.
Nature communications
|September 3, 2024
概括
病毒融合蛋白使用pH敏感的histidine开关来启动膜融合. 在GP64的这一发现为抗病毒疗法和针对包裹病毒的疫苗提供了新的策略.
科学领域:
- 结构生物学是结构生物学.
- 病毒学 病毒学
- 生物化学 生物化学
背景情况:
- 包裹病毒通过病毒融合蛋白与宿主细胞融合.
- 这些蛋白质的pH依赖的构造变化对于融合至关重要,但确切的机制仍然不清楚.
研究的目的:
- 阐明病毒膜融合的结构中间体和pH感应机制.
- 研究pH敏感开关在病毒融合蛋白中的作用.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定GP64在预注和中间状态中的结构.
- 细胞-细胞同位素形成测定和双色染料标记以验证pH传感.
主要成果:
- 冷EM结构揭示了III类融合蛋白GP64.4的早期中间状态.
- 一个涉及histidine残留物 (H23,H245,H304) 的pH敏感开关被确定为膜融合的触发因素.
- 实验分析证实了这种多胺开关在pH感应和聚变激活中的作用.
结论:
- 一个协调的多胺开关在病毒融合中充当pH传感器和激活器.
- 了解这种机制可以为开发针对病毒融合的新型抗病毒疗法和疫苗提供信息.
- 这些发现与感染人类的thogotoviruses和其他包裹病毒有关.
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