SARS-CoV-2 和 MERS-CoV 通过 nsp1 破坏宿主蛋白质合成,对综合应激反应产生差异性影响
bioRxiv : the preprint server for biology
|January 9, 2026
概括
像SARS-CoV-2和MERS-CoV这样的冠状病毒通过操纵蛋白质合成来逃避宿主防御. 了解这些差异对于开发新型抗病毒疗法来应对这些严重的公共卫生威胁至关重要.
科学领域:
- 病毒学和分子生物学
- 宿主-病原体相互作用
- 传染性疾病 传染性疾病
背景情况:
- 冠状病毒 (CoV) 对全球健康构成重大风险,需要有效的抗病毒治疗和疫苗.
- 了解冠状病毒,特别是SARS-CoV-2和MERS-CoV如何克服宿主抗病毒机制,对于疾病控制至关重要.
- 已知保存的非结构性蛋白质 (nsp) 1 抑制宿主蛋白质合成并降解宿主mRNA,同时保护病毒RNA.
研究的目的:
- 研究SARS-CoV-2和MERS-CoV nsp1蛋白与宿主综合应激反应 (ISR) 相互作用和操纵的独特机制.
- 阐明不同β冠病毒的nsp1如何影响宿主蛋白质合成,mRNA稳定性和压力颗粒形成.
- 确定SARS-CoV-2和MERS-CoV之间的nsp1功能上的差异,这些差异可以为开发有针对性的抗病毒策略提供信息.
主要方法:
- 利用复合的SARS-CoV-2和MERS-CoV表达nsp1突变体,其中保留域的变化.
- 感染野生型 (WT) 和淘汰 (PKR KO,PERK KO) 细胞来评估宿主蛋白质合成.
- 采用单分子光在位杂交 (smFISH) 来分析宿主mRNA降解.
- 监测压力颗粒的形成和GADD34的表达,这是eIF2α酸化的调节者.
主要成果:
- SARS-CoV-2 nsp1 感染导致 WT 和 PKR KO 细胞的翻译关闭,但在 PERK KO 细胞中被挽救,这表明 PERK 的作用.
- 尽管在WT细胞中,MERS-CoV nsp1突变物还能挽救翻译,这表明与ISR的相互作用不同.
- SARS-CoV-2 WT 抑制了 GADD34,而 nsp1 突变体和 MERS-CoV WT 诱导了它.
- 两种病毒的nsp1蛋白促进宿主mRNA降解,但SARS-CoV-2 WT抑制了压力颗粒的形成,而它的nsp1突变诱导了它们.
结论:
- SARS-CoV-2和MERS-CoV在与宿主ISR和nsp1介导的蛋白质合成控制的相互作用中表现出不同的策略.
- 这些致命的冠状病毒之间的nsp1功能差异凸显了冠状病毒与宿主相互作用的复杂性.
- 这些发现为开发针对当前和未来的冠状病毒爆发的特定抗病毒疗法提供了关键的见解.
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