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黄酮类衍生物抗癌活性的分子对接、分子动力学模拟和定量构效关系研究
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摘要
研究具有抗癌活性的黄酮类衍生物的定量构效关系(QSAR)、对接分析、作用机理及分子动力学的模拟。首先,利用传统的多元线性回归、基于SMILES编码的新型方法、3D-QSAR中的比较分子力场分析(CoMFA)与比较分子相似性指数分析(CoMSIA)对作为核因子-κ蛋白激酶抑制剂的一系列黄酮类衍生物的结构与活性关系进行了研究,得到了多种可靠的模型,并对模型进行了验证。其中基于原子契合方式构建的模型为最佳预测模型(CoMFA r~2=0.945,q_(LOO)~2=0.657;CoMSIA r~2=0.952,q_(LOO)~2=0.671)。此模型进一步通过14个化合物组成的样本外测试集进行验证,结果由CoMFA和CoMSIA模型得到的测试集外部验证系数(r_(pred)~2)分别为0.751和0.854。其次,利用分子对接和分子动力学模拟研究了这些黄酮类衍生物和核因子-κ蛋白激酶(PDB ID:4G3D)之间的相互作用,结果表明CoMFA和CoMSIA的立体、静电、疏水等力场系数等高图与分子对接的结果相一致,而分子动力学模拟又进一步验证了分子对接的结果。这些研究有助于揭示抑制剂与蛋白酶之间的作用模式,为进一步的新型抗癌药物的理性设计提供有益的信息。
The traditional MLR,the new SMILES-based method,and CoMFA and CoMSIA of 3D-QSAR were employed for studying flavonoid derivatives as nuclear factor-kappa protein kinase inhibitors.Several reliable models were established,and those models were verified.Statistically significant model of ligand-based 3D-QSAR from the common substructure-based alignment exhibited the best predictive power(CoMFA r~2=0.945,q~2=0.657;CoMSIA r~2=0.952,q~2=0.671).The model was further confirmed by analyzing 14 sets of compounds with diverse structure.The results showed high predictive r2 values of 0.751 for CoMFA and 0.854 for CoMSIA respectively.The molecular docking analysis revealed that both CoMFA and CoMSIA contour maps for steric,electrostatic,hydrophobic,and hydrogen- bonding interactions matched well.Molecular dynamics simulation was employed to further validate the docking results.This work may lead to a better understanding of the mechanism of action and aid to design novel and more potent anticancer drugs.
引文
[1]Yu,Z.;Li,X.;Ge,C;Si,H.;Cui,L.;Gao,H.;Duan,Y;Zhai,H.Mol.Divers.2015,19:135.
    [2]Deng,F.;Xie,M.;Zhang,X.;Li,P.;Tian,Y.;Zhai,H.;Li,Y.J.Mol.Struct.2014,1067:1.
    [3]Satpathy,R.;Guru,RK.;Behera,R.;Nayak,B.J.Pharm.Bioallied.Sci.2015,7:21.

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