艾滋病毒-1囊体适应的结构基础,以挽救IP6包装缺陷
Yanan Zhu1,2, Alex B Kleinpeter3, Juan S Rey4
1Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, UK.
bioRxiv : the preprint server for biology
|February 20, 2025
概括
一个新的突变,G225R,在缺少伊诺西六酸盐 (IP6) 的情况下恢复了HIV-1囊组合和感染力. 这一发现为病毒适应提供了洞察力,并为研究囊形成提供了一个工具.
科学领域:
- 病毒学 病毒学
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- 伊诺西六酸盐 (IP6) 对于人类免疫缺陷病毒1型 (HIV-1) 组装至关重要,促进了Gag格子的形成和随后的状组装.
- 在成熟过程中,HIV-1蛋白酶会分裂多蛋白,释放IP6以促进成熟囊体的形成,这对于病毒感染性至关重要.
- 之前发现的IP6独立的HIV-1Gag突变体是非传染性的,并未能形成稳定的状体.
研究的目的:
- 在IP6包装缺陷的HIV-1突变体中识别可恢复囊形成和传染性的突变.
- 阐明一种新型突变补偿HIV-1囊组合中的IP6缺陷的结构机制.
- 研究囊蛋白 (CA) 蛋白的C端在成熟囊形成中的作用.
主要方法:
- 基因查以确定IP6独立的HIV-1突变体中恢复感染力的突变.
- 单粒子冷电子显微镜 (cryo-EM) 用于确定突变状粒子 (CLPs) 的结构.
- 分子动力学模拟来分析突变对体稳定性的结构影响.
主要成果:
- 在CA C端的G225R突变恢复了对IP6包装缺陷的HIV-1突变体的囊形成和感染力.
- G225R在明显低于野生类型的IP6度下促进了*in vitro*将净化CA组装到CLP中.
- 高分辨率的冷EM结构显示,G225R突变重组了CA C末端,稳定了成熟囊中的六合体-六合体接口.
结论:
- G225R突变为HIV-1提供了一个结构机制,通过稳定成熟的囊体来适应IP6包装缺陷.
- 这项研究强调了非结构化CA C-终端在HIV-1囊组合中之前未被认可的作用.
- G225R突变是进一步研究HIV-1囊体结构,组合和功能的宝贵工具.
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