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通过ISGylation抑制SARS-CoV-2核体蛋白质二分化,并通过病毒PLpropro对其进行反作用
Wonjin Bang1, Jaehyun Kim2, Kanghun Seo1
1Department of Microbiology, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea.
Frontiers in microbiology
|November 8, 2024
概括
这项研究揭示,SARS-CoV-2核体 (N) 蛋白经历ISGylation,这种修饰抑制其二分化并增强对干扰素反应的敏感性. 病毒PLpro通过删除ISG15.5来对抗这种情况.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- ISGylation对于抗病毒免疫至关重要,在SARS-CoV-2感染期间修改先天免疫蛋白质.
- 直接ISGylation的SARS-CoV-2蛋白质及其功能影响仍然在很大程度上未知.
研究的目的:
- 为了研究SARS-CoV-2蛋白质的ISGylation.
- 为了确定ISGylation是否影响病毒蛋白功能并影响病毒复制.
主要方法:
- 同传染ISGylation测定是在SARS-CoV-2蛋白质上进行的.
- 位点定向突变发生法确定了Lys-261作为N蛋白的关键ISGylation位点.
- 下拉试验和重组病毒实验评估了N蛋白ISGylation的功能后果.
主要成果:
- 鉴定出SARS-CoV-2核体 (N) 蛋白质是ISGylation基质,其中Herc5充当E3结合酶.
- 在Lys-261中的ISGylation抑制了N蛋白的二分化,并增加了病毒对干扰素β的敏感性.
- 发现SARS-CoV-2 PLpro蛋白酶可以从N蛋白中去除ISG15,抵消抗病毒效应.
结论:
- SARS-CoV-2 N蛋白质的ISGylation通过破坏病毒蛋白质功能来作为宿主抗病毒机制.
- SARS-CoV-2 PLpro酶通过从N蛋白中解ISG15来对抗这种宿主防御.
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