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Updated: Sep 18, 2025

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Nanomanipulation of Single RNA Molecules by Optical Tweezers
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使用单分子FRET观察SAM-VI带状交换机动力学
Yanyan Xue1,2,3, Yi Sun1, Yichun Xia1
1Institute of Translational Medicine, School of Medicine, Yangzhou University, Yangzhou 225001, China.
Biomolecules
|June 26, 2025
概括
这项研究揭示了SAM-VI рибо开关如何使用Mg2+和SAM来控制基因表达. 它在状态之间进行过渡,SAM结合稳定了最终的形状,以调节SAM合成.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 带状切换器是调节基因表达的RNA分子.
- 像Mg2+这样的二价离子和特定的连接体对于 рибо开关的功能至关重要.
- 在对Mg2+和S-adenosyl-L-methionine (SAM) 的反应中,SAM-VI рибо开关的形状变化的精确机制尚未完全理解.
研究的目的:
- 阐明SAM-VI рибо开关 (riboSAM) 的动态结构机制.
- 为了研究Mg2+和SAM结合如何诱导 riboSAM 中的 conformational 开关.
- 了解由 riboSAM 的反调节细胞SAM 度.
主要方法:
- 对RNA (PLOR) 进行位置选择性标记,以纳入光染料 (Cy3-Cy5).
- 单分子福斯特共振能量转移 (smFRET) 用于监测构造动态.
- 对Mg2+和SAM反应中的 riboSAM 构造状态的分析.
主要成果:
- 在没有Mg2+和SAM的情况下,riboSAM以翻译激活的apo conformation存在.
- 2+会诱导动态的过渡-p和全-p状态,形成一个结合器结合口袋.
- SAM结合使这些状态稳定到过渡和全息形状,抑制基因表达.
结论:
- 在单个分子水平上,Mg2+和SAM协同调节 riboSAM 的结构动态.
- 这提供了对由 рибо开关对基因调节的机制性见解.
- 这些发现澄清了控制细胞SAM水平的反循环.
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