PTBP1-IRES复合体的整合性溶液结构显示出强烈的紧缩和排序,剩余的形状灵活性
Georg Dorn1, Christoph Gmeiner2, Tebbe de Vries1
1Institute of Biochemistry, Department of Biology, ETH Zürich, Zürich, Switzerland.
Nature communications
|October 13, 2023
概括
研究人员确定了与病毒RNA结合的聚皮里米丁通路结合蛋白1 (PTBP1) 的结构. 这种RNA结合蛋白复合体表现出紧缩和灵活性,揭示了PTBP1是如何作为RNA伴侣的.
科学领域:
- 结构生物学是结构生物学.
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- RNA结合蛋白 (RBPs) 通过与RNA的相互作用来调节基因表达.
- 许多RBPs包含内在无序的区域,使结构确定复杂化.
- рибо核蛋白 (RNP) 复合体通常缺乏单一的稳定状态,需要整合性方法.
研究的目的:
- 为了确定聚皮里米丁通道结合蛋白1 (PTBP1/hnRNP I) 的溶液结构,该蛋白与脑肌心炎病毒 (EMCV) 内核糖体进入部位 (IRES) 复合.
- 描述PTBP1与IRESRNA结合的结构后果.
- 了解 PTBP1 在病毒翻译中作为 RNA 陪伴者的作用.
主要方法:
- 综合性结构建模结合了磁共振,质谱和小角度散射数据.
- 对RNP复合体的解决状态结构分析.
- 蛋白质-RNA相互作用和形状动态的表征.
主要成果:
- PTBP1-EMCV IRES RNA复合体表现出紧缩和显著的形状灵活性.
- PTBP1充当RNA陪伴者,将IRESRNA组织成具有暴露茎的独特形状.
- 实现了异质RNP复合体的原子层结构细节.
结论:
- PTBP1与IRESRNA结合诱导了一个动态的,但有组织的,RNP结构对于病毒翻译至关重要.
- 在RNP复合体中,形状的多样性可能是具有功能重要性的共同特征.
- 整合性结构建模是描述复杂,灵活的RNP结构的强大方法.
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