结构建模揭示了操纵宿主免疫信号的病毒蛋白
Nitzan Tal1, Romi Hadari1, Renee B Chang2,3
1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 7610001, Israel.
bioRxiv : the preprint server for biology
|July 17, 2025
概括
病毒通常通过产生破坏核酸信号通路的蛋白质来逃避细菌免疫. 这项研究确定了这些病毒蛋白的共同特征,并开发了一种计算方法来发现新的病毒蛋白,揭示了免疫逃避的新机制.
科学领域:
- 分子生物学分子生物学
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
背景情况:
- 细胞内核酸信号传递是细菌,植物和动物的重要免疫机制.
- 病毒通常通过产生干扰免疫信号分子的蛋白质来抵消这种防御.
研究的目的:
- 分析封存免疫信号的病毒蛋白的结构和生物物理特征.
- 开发一种用于预测操纵细菌免疫信号的病毒蛋白的计算管道.
- 发现和描述抑制细菌Thoeris和CBASS系统的新型菌体蛋白质.
主要方法:
- 对进化无关的病毒信号隔离蛋白进行比较分析.
- 开发一个结构引导的计算管道,用于大规模基因组数据库选.
- 生物化学分析,X射线晶体学,结构建模和突变分析以描述蛋白质的功能和结构.
主要成果:
- 在病毒信号隔离蛋白中确定了共享的结构和生物物理特征.
- 发现并验证了许多以前未经表征的菌体蛋白抑制细菌Thoeris和CBASS系统.
- 描述了三个病毒蛋白家族:Sequestin和Lockin家族 (隔离3'cADPR和His-ADPR) 和Acb5家族 (切割3'3'-cGAMP).
- 在菌体数据库中发现了数千种这种信号操纵蛋白质,包括在T2,T4和T6等经过充分研究的菌体中.
结论:
- 菌体通常使用各种蛋白质来逃避细菌免疫信号.
- 开发的结构导向计算方法使病毒免疫操纵蛋白质的无偏见发现成为可能.
- 这项工作为克服宿主免疫力的病毒策略提供了洞察力,并为未来的研究提供了一个工具.
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