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A theoretical study of methylation and CH/π interactions in DNA intercalation: methylated 1,10-phenanthroline in adenine–thymine base pairs

机译:DNA插层中甲基化和CH /π相互作用的理论研究:腺嘌呤 - 胸腺嘧啶碱基对中的甲基化1,10-菲咯啉

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The study of CH/π interactions in DNA model intercalated systems has been carried out with the popular intercalator 1,10-phenanthroline (phen) and several methyl derivatives, changing number and position, and the adenine–thymine tetramers (AT/TA) where thymine also contains a methyl group. Density Functional Theory (DFT) was used for the calculations, by means of improved functionals including dispersion effects. Our results given by the AIM analysis confirm the existence of these CH/π interactions and the energy decomposition analysis shows a perfect direct correlation between the number of CH/π interactions found and their Δ E _(int) . Moreover, despite the important role of dispersion energy in the systems with more methyl groups, it is not yet enough to compensate the Pauli repulsion term, Δ E _(Pauli) , and the orbital contribution, Δ E _(orb) , and the electrostatic contribution, Δ E _(elstat) , become crucial for the stabilization of the structures in the intercalation process.
机译:DNA模型插层系统中的CH /π相互作用已经通过流体嵌入式1,10-菲啉(Phen)和几种甲基衍生物,改变数量和位置,以及腺嘌呤 - 胸腺嘧啶四聚体(AT / TA)在其中胸腺还含有甲基。密度函数理论(DFT)用于通过改进的功能,包括分散效应。我们的瞄准分析给出的结果证实了这些CH /π相互作用的存在,并且能量分解分析显示所发现的CH /π相互作用的数量与其δe_(int)之间的完美直接相关性。此外,尽管分散能量在具有更多甲基的系统中的分散能力的重要作用,但是补偿了Pauli排斥项,ΔE_(保罗)和轨道贡献,ΔE_(ORB),以及静电贡献,ΔE_(ELSTAT),对嵌入过程中的结构稳定至关重要。

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