选择性eIF4E-eIF4G配对和Trypanosomatids中的Cap-4识别机制:从EIF4E5-EIF4G1和EIF4E6-EIF4G5复合体的洞察
Renato Ferras Penteado1, Sophie Vichier-Guerre2, Beatriz Maria da Silva Pereira3
1Carlos Chagas Institute, Oswaldo Cruz Foundation, Rua Prof. Algacyr Munhoz Mader, 3775, 81350-010 Curitiba, PR, Brazil.
Journal of molecular biology
|November 20, 2025
概括
细胞的翻译启动在三子体中不同,使用独特的cap-4结构和多个eIF4E-eIF4G复合体. 晶体结构揭示了这些复杂物如何结合cap-4结构,解释了选择性相互作用.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 细胞翻译启动依赖于由细胞启动因子4E (eIF4E) 识别mRNA5'帽.
- 试类虫具有独特的mRNA cap-4结构和多个eIF4E-eIF4G复合体,与公认的真核生物系统有所不同.
- 了解这些差异对于阐明特赖帕诺索马提德特异性翻译调节至关重要.
研究的目的:
- 为了确定来自Trypanosoma brucei和T. cruzi. 的特定eIF4E-eIF4G复合物的高分辨率晶体结构.
- 研究选择性eIF4E-eIF4G相互作用的分子基础及其通过cap-4结合的调制.
- 阐明控制 cap-4 识别和结合亲和力的结构性决定因素.
主要方法:
- 对EIF4E5-EIF4G1和EIF4E6-EIF4G5复合体的高分辨率晶体结构的确定.
- 使用cap-4类似物进行生物物理分析.
- 不同eIF4E-eIF4G复合体的结构比较分析.
主要成果:
- 晶体结构揭示了Cap-4识别的关键决定因素,突出了Cap-4结构和Cap-binding口袋的灵活性.
- 在eIF4G结合时的形态变化表明加大了cap-4亲和力.
- 获得了关于试类动物中eIF4E-eIF4G配对的特异性的原子层次的洞察.
结论:
- 这项研究阐明了选择性eIF4E-eIF4G相互作用的结构基础.
- 盖子结合口袋中的结构可塑性和eIF4G结合时的形状重组对于盖子-4的识别至关重要.
- 这些发现为了解特里帕诺索马提德特异性翻译启动机制提供了基础.
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