在人类上皮细胞BEAS 2b细胞中MERS-CoV-nsp5的表达通过抑制IRF3核转位来减弱I型干扰素的产生
Y Zhang1, S Kandwal2,3,4, D Fayne2,4
1Viral Immunology Group, Trinity Biomedical Sciences Institute, School of Biochemistry and Immunology, Trinity College Dublin, Dublin, Ireland.
Cellular and molecular life sciences : CMLS
|October 12, 2024
概括
中东呼吸系统综合征冠状病毒 (MERS-CoV) nsp5蛋白酶抑制了宿主.
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:
- 中东呼吸系统综合征冠状病毒 (MERS-CoV) 导致严重的呼吸系统疾病,死亡率高.
- 低I型干扰素 (IFN) 诱导是MERS-CoV感染的特征.
- 病毒非结构性蛋白 (nsps) 通常会对宿主IFN的产生产生产生敌意.
研究的目的:
- 调查MERS-CoV nsp5病毒主蛋白酶在调节宿主抗病毒反应中的作用.
- 了解MERS-CoV nsp5如何影响人类呼吸道细胞中的IFN诱导.
主要方法:
- 在人类支气管上皮细胞BEAS 2b细胞中MERS-CoV-nsp5的过度表达.
- 检测IFN-β促进体激活和细胞因子的产生.
- 对RIG-I类受体 (RLR) 途径组件的分析.
- 研究IRF3表达,酸化和核转位.
- 使用对接和分子动力学 (MD) 模拟的蛋白质-蛋白质相互作用研究.
- 用针对nsp5.5的蛋白酶抑制剂进行治疗.
主要成果:
- 根据剂量,MERS-CoV-nsp5过度表达抑制了IFN-β促进体的激活和细胞因子的产生.
- nsp5抑制的IFN-β激活由RLR路径组件 (RIG-I,MAVS,IKK-ε,IRF3) 触发的.
- nsp5抑制了IRF3的核转位,但没有影响其表达或酸化.
- nsp5 特别与 IRF3 相互作用,可能掩盖 IRF3 的核定位信号 (NLS).
- 针对nsp5的蛋白酶抑制剂恢复了IFN-β的表达,证实了nsp5的酶作用.
结论:
- 通过抑制IRF3核转位,MERS-CoV nsp5破坏了宿主天生的抗病毒免疫力.
- 这种机制涉及nsp5和IRF3之间的直接相互作用,阻断抗病毒信号传输.
- 了解这种相互作用可以了解MERS-CoV病原体和潜在的治疗策略.
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