塞内卡山谷病毒3C蛋白酶分裂HDAC4以对抗I型干扰素信号传递
Zijian Li1,2, Jingjing Yang1,2, Ruiyi Ma1
1Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China.
Journal of virology
|February 10, 2025
概括
塞内卡谷病毒通过降解抗病毒蛋白HDAC4.4来逃避宿主免疫力. 病毒3C蛋白酶分裂HDAC4,阻止其限制病毒复制和干扰素信号传递的能力.
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:
- 塞内卡谷病毒 (SVV) 是一种新兴的猪病原体,造成了重大经济损失.
- SVV采用策略来逃避宿主抗病毒反应,但机制尚不清楚.
- 基因组脱乙酶 (HDACs) 涉及天生的免疫力,在病毒感染中的作用正在调查中.
研究的目的:
- 阐明SVV逃避宿主天生的免疫的分子机制.
- 为了研究基因组脱乙酶4 (HDAC4) 在SVV感染中的作用.
- 为了确定负责对抗HDAC4功能的SVV蛋白质.
主要方法:
- 主体细胞的SVV感染.
- 在感染期间分析HDAC4表达,降解和裂变.
- 宫外表达和siRNA介导的HDAC4.4的淘汰.
- 蛋白酶活性测定病毒3C蛋白酶 (3Cpro).
- 共同免疫沉和西部斑分析以研究蛋白质相互作用和降解途径.
- 评估I型干扰素 (IFN) 和IFN刺激基因 (ISG) 的表达.
主要成果:
- 在SVV感染引起的HDAC4.4的降解和裂变.
- 宫外HDAC4表达抑制了SVV复制,而HDAC4倒置则增强了它.
- SVV 3Cpro以蛋白酶依赖和酶介导的方式降解和分裂HDAC4.
- HDAC4与病毒RNA依赖的RNA聚合酶3D.相互作用并诱导了病毒RNA的蛋白质体降解.
- 切割后的HDAC4产品失去了抗病毒活性,未能诱导IFN/ISG反应.
- 在SVV 3Cpro中介的HDAC4对抗型I IFN信号的分裂.
结论:
- 通过准病毒3D聚合酶,HDAC4作为宿主抗病毒因子对抗SVV.
- SVV 3Cpro通过降解和裂变对抗HDAC4的抗病毒功能.
- 这种对抗性破坏了I型IFN信号传输,促进了病毒逃避.
- 研究结果揭示了一种新的病毒免疫逃避机制,涉及HDAC4和SVV 3C.
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