考克萨基病毒B3通过3C蛋白酶切割INTS10以促进其复制
Luna Yuan1, Liling Lin1, Chunyan Bi1
1Department of Microbiology, School of Basic Medical Sciences, Harbin Medical University, Harbin 150081, China.
International journal of molecular sciences
|January 28, 2026
概括
考克萨基病毒B3蛋白酶3C分裂整合子单元10 (INTS10),破坏U1和U2小核RNA处理. 这种裂变通过抵消snRNA来增强病毒复制.
科学领域:
- 病毒学和分子生物学
- 宿主-病原体相互作用
- RNA处理和新陈代谢
背景情况:
- 考克萨基病毒利用蛋白酶分裂病毒多蛋白质并操纵宿主RNA生物合成.
- 集成子单位10 (INTS10) 对于处理U1和U2小核RNA (snRNA) 至关重要,调节细胞转录.
- INTS10易受Coxsackievirus B (CVB) 的分裂,这表明它在病毒感染中起作用.
研究的目的:
- 研究INTS10在Coxsackievirus B3 (CVB3) 感染中的作用.
- 确定负责INTS10分裂的特定CVB3蛋白酶,并阐明其功能后果.
主要方法:
- 鉴定INTS10作为CVB3蛋白酶3C (3Cpro) 的基质.
- 分裂部位 (Q221) 的特征和由此产生的INTS10碎片.
- 在INTS10耗尽或调节U1/U2snRNA水平时,分析CVB3复制和snRNA处理.
主要成果:
- CVB3 3Cpro在残留物Q221上切割INTS10,产生一个特定的碎片.
- INTS10的耗尽显著增强了CVB3复制和受损的snRNA处理.
- 调节U1和U2的snRNA水平直接影响了CVB3的复制,过度表达抑制并降低病毒传播.
结论:
- 通过CVB3 3Cpro介导的INTS10分裂是破坏宿主U snRNA处理的关键病毒策略.
- 这种干扰取消了U1和U2 snRNAs的抗病毒作用,从而促进了病毒复制.
- 这项研究揭示了一种新的机制,CVB3通过这种机制颠覆宿主细胞机器,以实现自身的传播.
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