针对IP6包装缺陷的HIV-1囊的结构基础
Yanan Zhu1,2, Alex B Kleinpeter3, Juan S Rey4
1Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK.
Nature communications
|September 1, 2025
概括
在IP6缺乏的病毒中,HIV-1囊蛋白的新突变 (G225R) 通过稳定Gag格子来恢复感染力. 这一发现揭示了体C端在病毒组合和适应中的关键作用.
科学领域:
- 病毒学
- 结构生物学
- 生物化学
背景情况:
- 伊诺西六酸盐 (IP6) 对于HIV-1的组装和成熟至关重要.
- IP6 稳定了 Gag 晶格,对于 virions 中成熟的体形成至关重要.
- 之前的研究发现了具有低IP6包装的Gag突变,导致有缺陷的体的非传染性颗粒.
研究的目的:
- 在IP6缺乏条件下研究HIV-1组合中的补偿机制.
- 在IP6缺陷的HIV-1突变体中恢复感染力的囊蛋白 (CA) 突变的特征.
- 阐明CA C端在病毒组合中的结构和功能作用.
主要方法:
- 对HIV-1口腔突变的基因分析.
- 体组装测定体蛋白 (CA).
- 用冷电子显微镜 (CryoEM) 进行结构测定.
- 分子动力学 (MD) 模拟
主要成果:
- 在CA C端的补偿突变G225R恢复了IP6缺乏的HIV-1突变体的囊组合和传染性.
- 与野生型CA相比,G225R在显著较低的IP6度下增强了体外CA组合.
- 低温EM结构显示G225R诱导了结构化的CA C端,稳定了六体-六体接口.
- MD模拟支持G225R突变的稳定机制.
结论:
- 艾滋病毒-1可以通过囊蛋白中的G225R突变适应IP6缺陷.
- 在稳定HIV-1囊组合方面,CA C端起着至关重要的,以前未知的结构作用.
- 这些发现为病毒适应提供了洞察力,并为研究HIV-1囊形成提供了工具.
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