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Updated: Jun 14, 2025

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In Vitro Analysis of E3 Ubiquitin Ligase Function
Published on: May 14, 2021
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UBE3C通过2C的无处化依赖性降解来限制EV-A71的复制
Boming Cui1, Ge Yang1, Haiyan Yan1
1CAMS Key Laboratory of Antiviral Drug Research, Beijing Key Laboratory of Antimicrobial Agents, NHC Key Laboratory of Biotechnology of Antibiotics, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
Journal of virology
|August 30, 2024
概括
乌比奎丁蛋白联酶E3C (UBE3C) 通过向病毒2C蛋白进行降解来抑制肠道病毒A71 (EV-A71) 复制. 这一发现揭示了UBE3C作为对肠道病毒的宿主限制因子.
科学领域:
- 病毒学和分子生物学
- 宿主-病原体相互作用
- 通过乌比奎丁介导的法规.
背景情况:
- 病毒蛋白的无处不在是宿主防御机制.
- 肠道病毒A71 (EV-A71) 2C蛋白对于病毒复制至关重要.
- 对于控制肠道病毒感染的E3泛素酶的作用尚不完全理解.
研究的目的:
- 为了研究在EV-A71复制中泛素蛋白联酶E3C (UBE3C) 的作用.
- 阐明UBE3C限制EV-A71感染的机制.
- 为了确定UBE3C是否针对病毒2C蛋白.
主要方法:
- 在宿主细胞中操纵UBE3C表达 (敲击和过度表达).
- 测量病毒蛋白水平和病毒标位.
- 同免疫沉试验用于评估蛋白质结合.
- 位点定向突变发生,以确定2C蛋白的泛化位点.
- 对无处不在的模式的分析 (K33/K48相关).
主要成果:
- UBE3C的表达抑制了EV-A71的复制,而UBE3C的淘汰则增强了它.
- UBE3C直接与EV-A71 2C蛋白结合,并在K268.8促进其K33/K48结合的无所不在和降解.
- 在K268中突变2C取消了UBE3C介导的降解和抗病毒活性.
- UBE3C还向其他肠道病毒 (CVB3,CVA16) 的2C蛋白,抑制它们的复制.
结论:
- UBE3C作为对EV-A71和潜在的其他肠道病毒的宿主限制因子.
- UBE3C通过促进必需的病毒2C蛋白的无化和降解来抑制病毒复制.
- 这项研究揭示了一种新型的宿主抗病毒策略,涉及UBE3C和准病毒2C的泛素-蛋白酶体系统.
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