流感B病毒的NS1蛋白与5'-三酸化dRNA结合,抑制RIG-I激活和宿主抗病毒反应
Ryan Woltz1,2, Brandon Schweibenz2, Susan E Tsutakawa3
1Department of Molecular Biology and Biochemistry, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA.
bioRxiv : the preprint server for biology
|February 8, 2024
概括
流感B病毒的NS1B蛋白与5'三酸化双链RNA (5'ppp-dsRNA) 结合,阻断宿主RIG-I抗病毒通路. 这一发现揭示了一个新的免疫逃避策略和抗病毒药物的潜在目标.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
背景情况:
- 甲型和乙型流感病毒通过逃避宿主防御而导致严重的呼吸道疾病.
- B型流感病毒 (NS1B) 的非结构蛋白1与免疫逃避有关.
- 主体视网膜酸诱导基因I (RIG-I) 蛋白检测病毒RNA以触发抗病毒反应.
研究的目的:
- 阐明NS1B逃避宿主天生的免疫系统的机制.
- 研究NS1B和5'三酸化双链RNA (5'ppp-dsRNA) 之间的相互作用.
- 为了确定流感抗病毒药物开发的新目标.
主要方法:
- 整合性结构生物学和生物化学研究.
- 对结合5'ppp-dsRNA的NS1B C终端域 (NS1B-CTD) 的分析.
- 细胞感染野生型和突变型B型流感病毒.
主要成果:
- NS1B-CTD结合了末5'ppp-dsRNA,这是RIG-I的一个关键激活剂.
- 在5'ppp-dsRNA结合方面,NS1B-CTD与RIG-I竞争,抑制RIG-I激活和ATPase活性.
- 突变NS1B取消5'ppp-dsRNA结合,恢复RIG-I激活和感染细胞中的IRF-3酸化.
结论:
- 在B型流感感染期间,NS1B利用5'ppp-dsRNA结合抑制RIG-I抗病毒反应.
- 这代表了一种新的病毒免疫逃避机制.
- 针对NS1B-dsRNA相互作用可能导致新的抗病毒疗法.
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