在DNA中的dGpdC和dCpdG序列的光激活动态:一个全面的量子力学研究
Lara Martínez-Fernández1, James Alexander Green2, Luciana Esposito3
1Departamento de Química Física de Materiales, Instituto de Química Física Blas Cabrera, CSIC 28006 Madrid Spain.
Chemical science
|June 28, 2024
概括
超快UV光与GC-DNA的相互作用涉及快速的电荷转移,影响光和失活路径. DNA 序列和结构显著影响这些光物理动态.
科学领域:
- 摄影化学的使用.
- 分子生物物理学 分子生物物理学
- 计算化学计算化学
背景情况:
- 紫外线与DNA的相互作用对生物过程至关重要.
- 了解DNA光物理,特别是GC序列,是不完整的.
- 存在多种衰变途径,但它们的相互作用尚不清楚.
研究的目的:
- 使用集成计算方法来描述GC-DNA的光物理.
- 为了阐明紫外线激发后GC-DNA的亚皮秒动态.
- 绘制激发状态失活路径及其签名.
主要方法:
- 使用非adiabatic线性振动合 (LVC) 模型进行量子动态模拟.
- 最初的DNA结构的分子动力学采样.
- 量子力学几何优化使用时间依赖密度函数理论和极化连续模型.
主要成果:
- 大量的群体转移到G → C电荷转移状态 (CTintra) 发生在50 fs内,解释了超快的光火.
- 主要的失活路径涉及CTintra,其次是跨链质子转移 (10-50 ps).
- CTintra在GC中比CG步骤更快,更大程度上被填充,其衰变路径取决于序列.
结论:
- 这项研究全面地绘制了失活路径的红外和兴奋状态吸收特征.
- DNA序列和热波动对GC-DNA光动力学产生了重大影响.
- 发现有助于解释各种DNA序列的实验结果.
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