RNA结构和多个弱相互作用平衡了SARS-CoV-2核体RNA结合和相分离之间的相互作用
Aidan B Estelle1, Heather M Forsythe1, Zhen Yu1
1Department of Biochemistry and Biophysics, Oregon State University, Corvallis, OR 97331, USA.
PNAS nexus
|October 30, 2023
概括
在SARS-CoV-2核囊蛋白质.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 在SARS-CoV-2核体 (N) 蛋白质在病毒RNA包装和凝结物形成中起着至关重要的作用.
- 了解N-RNA相互作用的特定机制对于理解病毒功能至关重要.
- 区分N蛋白的序列独立与序列特定RNA结合仍然不清楚.
研究的目的:
- 识别特定的RNA结构和N蛋白域,参与特定序列相互作用.
- 阐明不同N-RNA相互作用在相位分离中的作用.
- 为了区分驱动病毒功能的相互作用和促进凝结物形成的相互作用.
主要方法:
- 利用光异性变异来测量N蛋白域 (NTD,CTD) 与各种RNA模型的结合亲和力.
- 采用核磁共振 (NMR) 光谱学来识别N蛋白NTD上的RNA结合位.
- 使用N蛋白域和不同的RNA结构 (ssRNA,dsRNA) 进行相分离测试.
主要成果:
- N-终端域 (NTD) 优先结合单链RNA (ssRNA),是主要的结合点,但对于相分离并不重要.
- 核磁共振 (NMR) 确定了NTD上的二次性,较弱的RNA结合面,突出与dsRNA或受损结合.
- 阶段分离是由多个弱相互作用 (例如,CTD,NTD二次面) 而不是强大的,特定的促进.
结论:
- 强烈的,特定的N-RNA相互作用和多价值弱相互作用都对N蛋白的多种功能有所贡献.
- 弱相互作用,特别是涉及CTD和NTD的二次面,是液体液体凝结物形成的关键驱动因素.
- NTD的主要结合部位对RNA结合很重要,但不仅仅负责相位分离.
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