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阿尔法病毒复制酶成分nsP3的近距离相互作用包括前病毒宿主因子eIF4G和AHNAK

Aditya Thiruvaiyaru¹, Sari Mattila¹, Mohammadreza Sadeghi¹

¹Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland.

|April 7, 2025

概括

这项研究确定了300多种与塞姆利基森林病毒nsP3相互作用的宿主蛋白质,揭示了像USP10和eIF4G1这样的新型因子对alphavirus复制至关重要,并建议翻译启动因子作为广泛的抗病毒标.

科学领域:

病毒学病毒学
分子生物学分子生物学
宿主-病原体相互作用

背景情况:

阳性链RNA病毒,包括α病毒,使用修饰的细胞内膜复制RNA.
阿尔法病毒非结构蛋白 (nsP1-nsP4) 对于基因组复制和膜修饰 (球形形成) 是必不可少的.
了解与病毒复制复合体相互作用的宿主因素是破译病毒复制机制的关键.

研究的目的:

为了识别Semliki森林病毒nsP3的近邻环境中的宿主蛋白质,这是病毒复制复合物的组成部分.
发现对α病毒RNA复制至关重要的新型宿主因素.
探索潜在的广泛的抗病毒点.

主要方法:

使用miniTurbo捕获近接宿主蛋白质的Semliki森林病毒nsP3的生物化.
对三种细胞系中nsP3相关蛋白质的蛋白质组分析.
siRNA查以验证已识别的宿主因子在病毒复制中的作用.
对4E1RCat的抗病毒活性评估,它是一种翻译启动因子的抑制剂.

主要成果:

在nsP3微环境中确定了300多种宿主蛋白,包括已知的nsP和新型相互作用体.
与这些蛋白质相关的突出生物过程包括核酸代谢,转化调节,细胞骨重组和膜重塑.
通过siRNA证实了六种新的前病毒因子 (USP10,AHNAK,eIF4G1,SH3GL1,XAB2,ANKRD17),其中大多数也支持奇孔古尼亚病毒的复制.
小分子4E1RCat对塞米利基森林病毒表现出抗病毒活性.

结论:

nsP3复制复合体招募了各种各样的宿主因子,参与了基本的细胞过程.
几种新发现的宿主因素对阿尔法病毒复制至关重要,为抗病毒开发提供了潜在的目标.
抑制翻译启动因子显示为广泛的抗病毒疗法的战略,对阿尔法病毒和冠状病毒都有效.

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