主体G3BP与病毒核体蛋白之间的相互作用调节了SARS-CoV-2的复制和病原性
Zemin Yang1, Bryan A Johnson2, Victoria A Meliopoulos3
1Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN, USA; Integrated Biomedical Sciences Program, University of Tennessee Health Science Center, Memphis, TN, USA.
Cell reports
|March 16, 2024
概括
在SARS-CoV-2核囊蛋白质.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 在细胞应激和病毒感染期间,G3BP1/2蛋白对于压力颗粒的形成至关重要.
- 在SARS-CoV-2核体 (N) 蛋白通过与G3BP1/2.2.相互作用来抑制压力颗粒组装.
- 之前关于G3BP1-N相互作用对SARS-CoV-2复制和发病效应的影响的研究产生了相互矛盾的结果.
研究的目的:
- 在结构和生化方面描述G3BP1-N蛋白相互作用.
- 利用结构引导的突变发生来特别破坏G3BP1-N相互作用.
- 阐明G3BP1-N相互作用在SARS-CoV-2复制和发病过程中的作用.
主要方法:
- 结构和生化分析以确定G3BP1-N相互作用残留物.
- 结构引导的突变发生能产生N-F17A突变的SARS-CoV-2.
- 细胞测试以评估应力颗粒组装抑制.
- 在小鼠模型中进行体内研究以评估病理学.
- 研究病毒基因组RNA封存的机制研究.
主要成果:
- 特别地,N-F17A突变取消了SARS-CoV-2 N蛋白与G3BP1/2.2.之间的相互作用.
- 在宿主细胞中,SARS-CoV-2 N-F17A未能抑制压力颗粒组装.
- 在实验室中,N-F17A突变体表现出病毒复制减少.
- 在体内研究显示,与N-F17A突变相关的病理学减少.
- 由N-F17介导的相互作用通过防止病毒RNA被分离成压力颗粒来促进SARS-CoV-2感染.
结论:
- 在SARS-CoV-2 N蛋白残留F17和G3BP1/2之间的相互作用对于抑制压力颗粒形成至关重要.
- 破坏N-F17-G3BP1/2相互作用会减弱病毒复制并减少病变.
- 这种相互作用通过防止病毒基因组RNA被封存成压力颗粒来促进病毒感染.
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