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短RNA复合体的结构和内部动力学通过脉冲EPR方法和MD模拟的组合来确定

Maximilian Gauger¹, Marcel Heinz², Anna-Lena J Halbritter³

¹Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue Str. 7, 60438, Frankfurt am Main, Germany.

Angewandte Chemie (International ed. in English)

|March 26, 2024

概括

电子磁共振 (EPR) 谱学揭示了RNA双重结构和动态. 旋转标签准确地模拟了cytidine,在与分子动力学模拟相结合时,可以进行精确的结构和运动研究.

科学领域:

生物物理学的生物物理.
结构生物学结构生物学
频谱学是一种光谱学.

背景情况:

了解RNA结构和动态对于其生物功能至关重要.
电子偏磁共振 (EPR) 光谱是研究生物分子结构和运动的强大工具.

研究的目的:

描述RNA复合体的结构和内部运动 (扭曲,拉伸,曲).
为了验证Cm旋转标签的使用,作为RNA中cytidine的准确模仿.
评估分子动力学 (MD) 模拟在描述带有旋转标签的RNA形态组合中的能力.

主要方法:

准备八个20个基对RNA复合体,在两个位置上使用Cm旋转标签.
在X,Q和G频段获取方向选择性的PELDOR/DEER数据.
F Mims ENDOR实验用于精确的旋转标签定位.
使用旋转标签参数化的力场与MD模拟的定量比较.

主要成果:

从多频 EPR.获得的旋转标签的详细距离和方向信息.
MD模拟准确地复制了实验性形状组合.
证实旋标签是优秀的cytidine模仿器,局部结构干扰最小.
EPR和MD模拟一起提供了对RNA复杂体的全球构造动态的见解.

结论:

旋标签非常适合RNA结构的高精度EPR研究.
将EPR与MD模拟相结合,可以对RNA结构动态进行可靠的表征.
该研究验证了研究改性核酸的先进计算方法.

关键词:

通过ENDOR光谱法进行测试.在EPR光谱学中使用EPR光谱.佩尔多尔光谱仪的使用方法这是一个RNARNARNARNARNA.分子动力学分子动力学

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Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

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Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...