在皮科纳病毒IRES类型中,eIF4G结合RNA域的结构在拓上保持一致
Hasan Al Banna1, Naba Krishna Das1, Marina Kalinina2
1Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, MA, USA.
Nature communications
|February 14, 2026
概括
病毒RNA结构称为内部核糖体进入点 (IRES) 域是翻译的关键. 这项研究揭示了I型IRES域的结构,显示了潜在的通用抗病毒药物在不同病毒IRES类型中保留的特征.
科学领域:
- 分子生物学分子生物学
- 病毒学 病毒学
- 结构生物学 结构生物学
背景情况:
- 病毒内部核糖体进入部位 (IRES) 的RNA域对于正义RNA病毒的独立转化启动至关重要.
- 这些关键的IRES领域的精确结构和机制在很大程度上仍未被描述.
研究的目的:
- 确定Coxsackievirus B3 (CVB3) IRES域V (dV) 的高分辨率晶体结构,作为I型IRES结构的代表模型.
- 研究I,II和III类IRES域之间的结构相似性和差异,以及它们对eIF4G结合和病毒翻译的影响.
主要方法:
- 在3 Å分辨率的X射线晶体学以确定CVB3IRES域V的原子结构.
- 微角X射线散射 (SAXS) 来评估溶液中的RNA折叠.
- 结构引导的蛋白质核酸结合研究,计算建模和X射线足迹,以调查与eIF4G HEAT1域的相互作用.
主要成果:
- CVB3 IRES dV 的晶体结构揭示了由 A 丰富的图案组织的 H 型四向结架构.
- 尽管有序列变化,但在I型CVB3 dV和II型 (EMCV JK) 和III型 (HAV dV) IRES的类似域之间观察到显著的三级结构相似性.
- 对比分析表明,在不同类型的IRES中,eIF4G结合相互作用的保存机制存在,这表明了共同的功能策略.
结论:
- 跨不同病毒类型的IRES域的结构性保护,特别是它们与eIF4G的相互作用,为广泛的抗病毒药物开发提供了潜在的目标.
- 了解这些保存的结构特征对于破译病毒翻译启动的普遍机制至关重要.
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