抑制mRNA核出口可以促进SARS-CoV-2的病变发生
Menghan Mei1, Anastasija Cupic2,3, Lisa Miorin2,4
1Department of Biochemistry, Center for Structural Biology, Vanderbilt University School of Medicine, Nashville, TN 37232.
概括
严重急性呼吸系统综合征冠状病毒2 (SARS-CoV-2) 非结构蛋白1 (Nsp1) 使用酸性N终端补丁结合NXF1,抑制宿主mRNA输出并促进病毒毒性.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- SARS-CoV-2非结构蛋白1 (Nsp1) 是一个关键的毒性因子.
- Nsp1 抑制宿主基因表达和抗病毒反应.
- Nsp1病毒性功能的机制尚未完全理解.
研究的目的:
- 为了阐明NSP1介导的mRNA出口抑制的机制.
- 为了确定特定的NSP1与NXF1-NXT1mRNA输出受体的相互作用部位.
- 确定NSP1-NXF1相互作用在SARS-CoV-2复制和致病性中的作用.
主要方法:
- 基于晶体结构的NSP1突变发生.
- 可光激活的NSP1探针测定.
- 重组SARS-CoV-2突变病毒的生成.
- 在体内致病性研究.
主要成果:
- 在Nsp1上有一个酸性N-终端补丁对于NXF1-NXT1相互作用至关重要.
- NXF1的RNA识别动机 (RRM) 域是一个Nsp1结合点.
- 一种功能分离的NSP1突变体失去了NXF1的相互作用,但保留了翻译抑制.
- Nsp1 N端酸性补丁对于抑制宿主mRNA输出,病毒复制和体内致病性至关重要.
结论:
- Nsp1直接针对NXF1-NXT1mRNA出口通路.
- Nsp1 N-终端酸性补丁是SARS-CoV-2病毒性的关键决定因素.
- 通过NSP1抑制宿主mRNA输出对于病毒复制和致病性至关重要.
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