小鼠白血病病毒GlycoGag通过ER-phagy受体RETREG1对抗SERINC5
Iqbal Ahmad1, Jing Zhang1, Rongrong Li1
1State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China.
bioRxiv : the preprint server for biology
|March 17, 2025
概括
鼠类白血病病毒 (MLV) glycoGag使用选择性自来降解细胞质中的宿主限制因子 SERINC5 (血清结合剂5). 这种依赖RETREG1的机制比HIV-1 Nef更强大.
科学领域:
- 病毒学 病毒学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 血清结合剂5 (SERINC5) 通过整合到病毒包裹中,限制了像HIV-1和MLV这样的包裹病毒.
- 病毒蛋白HIV-1 Nef和MLV glycoGag对抗SERINC5,减少其在生产细胞中的表达.
- SERINC5细胞表面表达受多基化调节,像K130R这样的突变将其保留在细胞质中.
研究的目的:
- 为了研究MLV glycoGag下调SERINC5.5.的机制.
- 为了比较MLV glycoGag和HIV-1 Nef与SERINC5.5的对抗策略.
- 阐明选择性自在宿主限制因子的逆转录病毒对抗中的作用.
主要方法:
- 使用CRISPR/Cas9敲除来评估基因依赖性.
- 采用了亲和度净化质谱法来识别相互作用的蛋白质.
- 使用突变物 (例如,K130R) 调查病毒蛋白局部化和降解途径.
- 分析了网膜细胞调节器1 (RETREG1) 和微ER-phagy的作用.
主要成果:
- 通过微ER-phagy,一个依赖RETREG1.1的机制,MLV glycoGag通过细胞质SERINC5进行下调.
- 艾滋病毒-1 Nef降低了细胞表面SERINC5的调节,而glycoGag则在到达细胞表面之前准了细胞质SERINC5.
- 与SERINC5的相互作用稳定了glycoGag,并将其招募到血膜中进行SERINC5下调.
结论:
- MLV glycoGag采用一种强大的微ER-phagy通路来降解SERINC5,突出显示了一种复杂的病毒对抗策略.
- 这些发现揭示了不同逆转录病毒蛋白对SERINC5抗的独特机制.
- 这项研究为涉及逆转病毒和SERINC5.5的宿主-病原体"军备竞赛"提供了关键的见解.
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