信号化酶复合体介导轮状病毒VP7处理和病毒组合
Xuejiao Zhu1,2, Liliana Sanchez-Tacuba3, Wandy Beatty1
1Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, MO, USA.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
信号酶复合体 (SPC) 对于轮状病毒感染至关重要,有助于VP7蛋白质的成熟. 破坏SPC会损害病毒聚集和感染力,这表明它是一个潜在的抗病毒目标.
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:
- 病毒葡萄糖蛋白需要在内分泌网膜 (ER) 进行适当的处理才能感染.
- 罗塔病毒外蛋白VP7是一种ER居住蛋白,具有未知的信号裂解机制.
研究的目的:
- 为了确定参与轮状病毒VP7处理和成熟的宿主因素.
- 阐明已识别的宿主因子在轮状病毒感染和聚集中的作用.
主要方法:
- 与质谱相结合的协同亲和性净化用于识别VP7相互作用蛋白.
- CRISPR/Cas9基因编辑和siRNA用于候选宿主因子的基因淘汰.
- 传输电子显微镜 (TEM) 分析病毒粒子形态.
- 局部定向突变发生,以调查蛋白质与蛋白质相互作用.
主要成果:
- 信号酶复合体 (SPC) 的成员被确定为与VP7.7相互作用的宿主因子.
- SPC子单元的淘汰或淘汰显著降低了轮状病毒标位,无论病毒菌株和细胞类型如何.
- 失去了SPC损害了VP7信号裂解,导致异常的病毒颗粒和病毒成熟和组装中的缺陷.
- VP7中的E256残留物被确定为SPC的关键结合部位,该部位的突变降低了病毒感染力.
结论:
- SPC是一种新型的轮状病毒VP7成熟和virion组装的调节器.
- SPC促进了VP7信号的有效裂解,这对于病毒感染性至关重要.
- SPC代表了针对轮状病毒的广泛抗病毒治疗开发的潜在细胞标.
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