一个整合性表征的proline cis和转变的 conformers 在一个无序的
Alice J Pettitt1, Vaibhav Kumar Shukla2, Angelo Miguel Figueiredo3
1Department of Structural and Molecular Biology, Division of Biosciences, London, United Kingdom; Department of Engineering, Faculty of Natural, Mathematical and Engineering Sciences, King's College London, London, United Kingdom; The Francis Crick Institute, London, United Kingdom.
使用分子动力学 (MD) 模拟和NMR,研究了内在失序蛋白 (IDP) 动态. 该研究使用增强的采样方法在SARS-CoV-2ORF6 C末端区域 (ORF6CTR) 中表征了proline cis/trans异构.
科学领域:
- 蛋白质动态和内在无序蛋白质 (IDP).
- 计算生物物理学和结构生物学.
背景情况:
- 内在无序蛋白 (IDP) 在细胞功能中至关重要,并且经常含有proline残留物.
- 氨酸的cis/trans异构化影响了IDP的结构格局,但很难研究.
- 现有的方法,如分子动力学 (MD) 模拟和NMR光谱,在完全描述这些状态方面存在局限性.
研究的目的:
- 描述SARS-CoV-2ORF6 C终端区域 (ORF6CTR) 的cis和trans子组,与-57 (P57) 异构化相关.
- 评估不同MD力场对无序蛋白质的准确性.
- 用实验数据验证计算预测.
主要方法:
- 使用了全原子MD模拟与增强的采样 (元动力学).
- 在模拟中使用了三种不同的力场 (AMBER03ws,AMBER99SB-disp,CHARMM36m).
- 综合实验技术:核磁共振 (NMR) 光谱和小角度X射线散射 (SAXS).
主要成果:
- 在元动力学 (AMBER03ws) 预测的cis-P57种群和实验性NMR数据之间取得了良好的一致性.
- 在模拟旋转半径 (AMBER03ws) 和实验SAXS测量之间观察到强烈的相关性.
- 证实了ORF6CTR的cis-P57和trans-P57形态的高度动态性.
结论:
- 结合多层次计算和实验的综合方法对于研究高度动态的蛋白质状态是有效的.
- ORF6CTR 的 cis-P57 和 trans-P57 状态非常动态.
- 这种跨学科的策略克服了描述复杂蛋白质动态的单个方法的局限性.
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