对HCMV终结酶辅助蛋白pUL77和pUL93的功能和结构见解
C Gourin1, F Di Meo2,3, C Delmon1
1Inserm, CHU Limoges, University of Limoges, RESINFIT, U1092, Limoges, France.
Journal of virology
|September 16, 2025
概括
研究人类细胞巨乳病毒 (HCMV) 蛋白质pUL77和pUL93揭示了重要的核定位信号和保存区域. 这些发现为开发创新的抗HCMV类疗法以打击抗病毒耐药性提供了新的目标.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 人类细胞巨乳病毒 (HCMV) 对免疫功能低下和先天感染的个体构成重大风险.
- 针对病毒DNA聚合酶的现有抗病毒疗法由于毒性和耐药性而面临限制.
- 莱特莫维尔 (LTV) 针对HCMV终结酶复合体,显示出有希望的结果,但已经出现了新兴的耐药性突变.
研究的目的:
- 研究HCMV蛋白质pUL77和pUL93.3中的核定位信号 (NLS) 的多态性,突变和功能相关性.
- 通过分析这些基本的终酶相关蛋白来确定抗HCMV策略的新型治疗点.
- 探索开发基于的抑制剂的潜力,以补充现有的抗病毒治疗.
主要方法:
- 在18种疹病毒中对pUL77和pUL93的序列对齐,以确定保存和可变区域.
- 在接受LTV治疗的患者中发生的突变的分析.
- 评估病毒复制和自主细胞生产中的核定位动机.
- 基于人工智能的建模以阐明蛋白质功能和相互作用.
主要成果:
- 在pUL77和pUL93中,在疹病毒中确定了保留和可变区域.
- 新出现的LTV突变没有赋予耐药性,但pUL77 R43C与pUL56 C325F相结合减少了LTV耐药性.
- 在pUL77 (43RVRKRYLRQ55,225PRWKRV231) 和pUL93 (505RDRRGRLRR513) 中发现了病毒复制的基本核定位动机.
结论:
- pUL77和pUL93具有功能部位,包括重要的核定位动机,对于病毒复制至关重要.
- 这些蛋白质及其基因代表了开发新的抗HCMV治疗策略的潜在新目标,例如抑制性.
- 了解这些目标可以帮助克服当前在HCMV感染中抗病毒耐药性的挑战.
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