人类细胞巨乳病毒二次包裹的启动需要gM/gN糖蛋白复合体,并涉及棕化
Laura Cortez Rayas1, Ronja Rogg1, Maximilian Voll2
1Institute of Virology, Ulm University Medical Center, Ulm, Germany.
Journal of virology
|December 8, 2025
概括
人类细胞巨型病毒 (HCMV) 的gM/gN复合体对于启动病毒二次包裹至关重要. 这种复杂或棕结合的破坏会阻止囊芽,导致组装缺陷.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 人类细胞巨乳病毒 (HCMV) 组装涉及二次包裹,这是一个关键但不太了解的过程.
- 在疹病毒中保存的葡萄糖蛋白M (gM) /葡萄糖蛋白N (gN) 复合体与病毒形态发生有关.
研究的目的:
- 阐明HCMVgM/gN复合体在病毒形态发生的二次包裹阶段的功能.
- 调查棕化在HCMV组装过程中gM/gN复合物的功能中的作用.
主要方法:
- 使用了具有特定gN尾部突变 (TB-gN-C123S) 的HCMV突变.
- 在野生型HCMV感染细胞中使用针对gM的siRNA淘汰.
- 使用电子显微镜进行了超结构分析.
- 研究的gM-和gN-null HCMV突变病毒.
- 在野生型HCMV感染细胞中抑制棕化.
主要成果:
- 一个gN细胞质尾部突变 (TB-gN-C123S) 损害了二次包裹的启动,导致囊细胞无法芽.
- gM knockdown 和 gM/gN-null 突变体表现出类似的缺陷,在细胞质病毒组合区 (cVAC) 中外围积累了体.
- 棕化抑制模仿了这些缺陷,显示了部分体的体和蛋白质聚合物的积累.
结论:
- 在启动二次包裹过程中,HCMV gM/gN 综合体起着至关重要的作用.
- 棕化与HCMV组装过程中gM/gN复合物的功能有关.
- 在cVAC中,HCMV组件似乎是空间组织的,gM/gN介导着囊体与膜的相互作用.
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