在SARS-CoV-2 NSP5中,通过颠覆基因组脱乙酶2的作用来对抗MHC II的表达
Nima Taefehshokr1, Alex Lac1, Angela M Vrieze1
1Department of Microbiology and Immunology, and the Western Infection, Immunity and Inflammation Centre, The University of Western Ontario, London, Ontario, CanadaN6A 5C1.
Journal of cell science
|April 29, 2024
概括
SARS-CoV-2 主蛋白酶NSP5通过向CIITA促进体传递HDAC2来抑制主要基因相容性复合体 (MHC) II表达,从而阻碍了自适应性免疫反应.
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:
- SARS-CoV-2 感染通过降低MHC II对抗原呈现细胞的调节,损害了抗原呈现.
- 在SARS-CoV-2诱导的MHC II下调背后的精确分子机制尚不清楚.
研究的目的:
- 阐明SARS-CoV-2降低主要基因相容性复合体 (MHC) II表达的机制.
- 确定负责抑制MHC II的病毒蛋白及其作用模式.
主要方法:
- 在人类抗原呈现细胞中分析蛋白质和基因表达.
- 研究了SARS-CoV-2主要蛋白酶 (NSP5) 在MHC II调控中的作用.
- 评估了HDAC2和IRF3对CIITA促进者的影响.
主要成果:
- 通过降低CIITA水平,SARS-CoV-2主要蛋白酶 (NSP5) 降低了MHC II的表达.
- NSP5将HDAC2传递给CIITA促进体,导致脱乙基化和促进体的失活,独立于NSP5的蛋白酶活性.
- 通过CIITA再表达或HDAC2敲击,MHC II的抑制被逆转.
结论:
- 发现了一种新的机制,即SARS-CoV-2 NSP5通过HDAC2-介导的CIITA促进体失活来抑制MHC II的表达.
- 这种病毒策略可能会通过损害抗原呈现来削弱自适应性免疫反应.
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