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smFRET 通过BfiI限制内核酶检测Cis和TransDNA相互作用

Šaru Nė Ivanovaitė^1,2, Justė Paksaitė², Aurimas Kopu Stas^1,2

¹Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Savanorių 231, Vilnius LT-02300, Lithuania.

The journal of physical chemistry. B

|July 15, 2023

概括

新的单分子分析揭示了BfiI限制酶如何与DNA点相互作用. 这些方法跟踪蛋白质-DNA结合和DNA循环,提供细菌防御机制的见解.

科学领域:

分子生物学分子生物学
生物化学生物化学
显微镜的使用方法

背景情况:

蛋白质-DNA相互作用对于生物功能至关重要,具有多样化的搜索机制.
像BfiI一样的IIS型限制性内核酶对细菌对异种DNA的免疫非常重要.
研究短暂的,双目标DNA相互作用带来了重大的技术挑战.

研究的目的:

开发新的单分子Förster共振能量转移 (smFRET) 试验,用于研究BfiI-DNA相互作用.
描述由BfiI介导的DNA循环和转基因相互作用.
在单个分子水平上分析BfiI结合动态和构造变化.

主要方法:

开发基于smFRET的两种测试来监测BfiI-DNA相互作用.
试验1:检测"Phi"和"U"形DNA循环事件.
试验2:使用全内部反射光显微镜 (TIRFm) 专注于跨BfiI-目标DNA相互作用.

主要成果:

直接观察BfiI在目标上和目标之外的约束事件.
描述BfiI结合动力学,显示更长的结合时间到目标部位.
证明BfiI在DNA结合过程中很少改变其构造.

结论:

开发的smFRET试验为研究涉及双重目标的复杂蛋白质-DNA相互作用提供了强大的工具.
这些测试提高了特异性,并减少了研究BfiI-DNA系统的观察时间限制.
该方法在超分辨率显微镜研究中适用于其他DNA结合蛋白和DNA基质.

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