口病病毒2B蛋白通过向YTHDF2来对抗STING诱导的抗病毒活性
1State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China.
概括
脚病病毒 (FMDV) 通过降解DNA诱导信号中的关键蛋白质STING来逃避宿主免疫力. 病毒蛋白2B和3Cpro促进这种降解,其中2B招募YTHDF2来抑制干扰素生产并增强FMDV复制.
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:
- 脚病病毒 (FMDV) 对抗宿主天生的免疫力,包括视网膜酸诱导基因I (RIG-I) 类受体 (RLRs) 途径.
- 通过FMDV干扰DNA诱导的信号通路,特别是干扰素基因刺激器 (STING) 途径的精确机制仍然不完全理解.
研究的目的:
- 阐明FMDV抑制DNA诱导信号通路的机制.
- 研究FMDV蛋白2B和3Cpro在调节STING表达和功能的作用.
- 探索YTH m6ARNA结合蛋白2 (YTHDF2) 在FMDV的免疫逃避策略中的参与.
主要方法:
- 在FMDV感染后分析STING mRNA和蛋白质水平.
- 调查FMDV 2B和3Cpro蛋白在STING调节中的功能.
- 位点定向突变发生,以评估FMDV 2B残留物的作用 105.
- 在缺乏YTHDF2的小鼠中评估FMDV复制和宿主耐药性.
主要成果:
- FMDV感染在mRNA和蛋白质水平上显著抑制了STING表达.
- FMDV 3Cpro蛋白酶活性和FMDV 2B破坏了STING mRNA,导致STING衰退.
- 通过残留物105,FMDV 2B招募了YTHDF2来结合STING mRNA,抑制I型干扰素并促进病毒复制.
- 在FMDV 2B中发生的K105A突变减弱了病原性,而YTHDF2缺陷增强了对FMDV感染的抵抗力.
结论:
- FMDV 2B和3Cpro蛋白通过降低STING的调节,有助于免疫逃避.
- FMDV 2B,YTHDF2和STING mRNA之间的相互作用代表了先天免疫抑制的新机制.
- 针对FMDV 2B-YTHDF2相互作用可以提供针对FMDV感染的治疗策略.
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