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Updated: Jun 13, 2025

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Single-molecule Manipulation of G-quadruplexes by Magnetic Tweezers
Published on: September 19, 2017
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在G-四倍折叠的早期事件被时间分辨率小角度X射线散射捕获
Robert C Monsen1, T Michael Sabo1, Robert Gray1
1Department of Medicine, UofL Health Brown Cancer Center, University of Louisville, Louisville KY, 505 S Hancock St, Louisville, KY 40202.
bioRxiv : the preprint server for biology
|September 16, 2024
概括
快速崩,就像蛋白质化球体的形成一样,先于G-四倍折叠. 寡核酸G4折叠的这个早期阶段发生在600 ms以下.
科学领域:
- 生物物理学的生物物理.
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- 在端粒维护和基因调节中,G-四重复 (G4) 结构至关重要.
- 了解G-四重复的折叠路径是阐明它们的生物功能的关键.
研究的目的:
- 为了研究混合1和混合2端粒G-四重复结构的早期折叠动态.
- 用时间解析实验来描述G4形成期间的快速结构变化.
主要方法:
- 时间分辨小角度X射线散射 (TR-SAXS) 以实时监测结构变化.
- 为了启动和跟踪折叠,进行pH跳跃动态研究.
- SAXS 集合优化方法 (EOM) 用于模拟展开状态.
主要成果:
- 观察到未折叠的寡核酸的快速单相崩,在<600 ms内完成.
- 在这个崩过程中,旋转半径从20.6减至12.6 Å.
- 萨克斯EOM分析揭示了展开状态作为一个动态的组合与短暂的针头结构.
- 均衡研究证实在性pH下完全G4展开,但在LiCl中没有.
结论:
- G-四倍折叠涉及最初的快速崩,类似于蛋白质中化球体的形成.
- 这种崩接着是构造性搜索,导致本地G4接触的形成.
- 这些发现为G4折叠路径和展开状态的性质提供了新的见解.
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