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关氨酸-氨酸基对的电子亲和力和离子形成时的结构性扰动
Nancy A Richardson1, Steven S Wesolowski, Henry F Schaefer
1Center for Computational Quantum Chemistry, University of Georgia, Athens 30602-8107, USA.
关氨酸-氨酸 (GC) DNA 基对具有正的亚亚巴特电子亲和力 (AEA),表明它可以结合电子. 这种稳定性来自于键,使GC离子比中性对更稳定.
科学领域:
- 计算化学的计算化学
- 生物物理学的生物物理.
- 量子化学 是一个量子化学.
背景情况:
- 沃森-克里克 DNA 基因对的电子特性对 DNA 的稳定性和功能至关重要.
- 了解电子亲和力是预测分子相互作用和反应性的关键.
研究的目的:
- 使用先进的计算方法预测GC DNA基对的亚亚巴特电子亲和力 (AEA).
- 为了研究GC基对及其离子的结构和电子特性.
主要方法:
- 使用密度函数理论 (DFT) 方法,使用双倍和三倍泽塔加极化加扩散 (DZP++和TZ2P++) 基础集.
- 计算与实验电子亲和度数据进行校准.
- 优化结构和自然人口分析 (NPA) 用于确定电荷分布.
主要成果:
- DFT始终预测GC对的正AEA (例如,TZ2P++/B3LYP的+0.48 eV).
- GC离子显示电子定位主要在细胞因子部分,稳定由键与关氨酸.
- 与中性GC对 (23.9 kcal/mol) 相比,GC离子表现出更大的热力学稳定性 (35.6 kcal/mol的配对能量).
结论:
- GC DNA 基对具有积极的亚亚巴特电子亲和力,促进了电子结合.
- 在GC对中的键显著稳定了阳离子形式.
- 计算发现与类似系统中电子亲和力的实验观测一致.
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