酸化使病毒凝聚物的全性控制成为可能
Julia Acker1, Xinyu Wang1, Daniel Desirò1
1Department of Chemical Engineering and Biotechnology, University of Cambridge, CB3 0AS, Cambridge, UK.
bioRxiv : the preprint server for biology
|June 6, 2025
概括
病毒复制依赖于内在无序的蛋白质 (IDP) 形成凝聚物. 罗塔病毒NSP5蛋白质变体表现出多样化的相分离能力,酸化在跨菌株的凝聚物形成中起着关键作用.
科学领域:
- 病毒学 病毒学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 内在失序蛋白 (IDP) 对于病毒复制器官的形成至关重要.
- 在轮状病毒中,NSP5蛋白通过液态液相分离 (LLPS) 驱动冷凝物形成.
- 在NSP5的序列多样性提出了关于跨菌株的保存凝聚物形成和核化机制的问题.
研究的目的:
- 为了研究NSP5驱动的冷凝物形成在轮状病毒菌株的保存性质.
- 为了确定不同的NSP5变体是否利用相分离核的替代机制.
- 阐明酸化在NSP5相分离和病毒器官形成中的作用.
主要方法:
- 机器学习被用来预测NSP5变体的相分离倾向.
- 进行了体外相位分离试验.
- 在重组病毒中测试了工程NSP5变异.
- -交换质谱法 (HDX-MS) 用于研究蛋白质动态.
主要成果:
- NSP5变异在它们对LLPS的倾向上表现出显著的差异.
- 一种具有较低LLPS倾向的工程变体支持细胞中的凝结物形成,尽管在体外失败.
- 低LLPS倾向菌株需要NSP5酸化进行相隔核化,而不是高倾向菌株.
- HDX-MS揭示了高倾向性NSP5变体中的酸化依赖的全开关.
结论:
- 酸化在轮状病毒复制性器官形成中起着取决于环境的作用.
- 不同的轮状病毒菌株在NSP5驱动的凝结核形成过程中采用了不同的机制.
- 了解NSP5 LLPS机制是破译多种菌株病毒器官组合的关键.
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