SARS-CoV-2 Nsp15通过抑制IRF3酸化和核转位来抑制I型干扰素的产生
Dianqi Zhang1,2,3, Likai Ji2, Xu Chen2,4
1Clinical Laboratory Center, The Affiliated Taizhou People's Hospital of Nanjing Medical University, Taizhou 225300, China.
iScience
|September 8, 2023
概括
SARS-CoV-2 Nsp15 蛋白质通过阻断干扰素生产和 IRF3 激活来抑制宿主免疫反应. 它通过干扰TBK1激酶活性和促进IRF3降解来实现这一目标.
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:
- 严重急性呼吸系统综合征冠状病毒2 (SARS-CoV-2) 是全球主要的健康威胁.
- 包括SARS-CoV-2在内的冠状病毒采用策略来逃避宿主干扰素 (IFN) 反应.
- 了解病毒免疫逃避机制对于开发有效的对策至关重要.
研究的目的:
- 阐明SARS-CoV-2 Nsp15对宿主天生的免疫反应产生敌对作用的机制.
- 研究NSP15在抑制干扰素β (IFN-β) 生产和抗病毒信号传递中的作用.
主要方法:
- 研究了SARS-CoV-2 Nsp15对IFN-β和IFN刺激基因 (ISG56,CXCL10) 表达的影响.
- 评估了NSP15对IRF3酸化和核转移的影响.
- 使用生物化学分析来确定Nsp15,TBK1和IRF3.3之间的相互作用.
- 研究了NSP15在IRF3核导入和降解途径中的作用,包括自.
主要成果:
- SARS-CoV-2 Nsp15显著降低了IFN-β和ISG的表达.
- Nsp15通过对抗RLR通路来抑制IRF3酸化和核转位.
- Nsp15的内核酶域 (EndoU) 直接与TBK1的激酶域 (KD) 结合,破坏TBK1-IRF3的相互作用和酸化.
- Nsp15通过与KPNA1结合并促进其自依赖的降解来阻止化IRF3的核转位.
结论:
- SARS-CoV-2 Nsp15采用双重机制来抑制宿主天生的免疫力.
- Nsp15直接抑制TBK1激酶活性,并促进IRF3.3的降解.
- 这些发现揭示了SARS-CoV-2 Nsp15的新型免疫逃避策略,突出了其在病毒病原发生中的重要性.
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