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基于分子对接的6-萘甲基取代HEPT类HIV-1逆转录酶抑制剂构效关系研究 总被引:1,自引:1,他引:0
采用分子对接方法得到了一系列6-萘甲基取代HEPT类逆转录酶抑制剂分子与HIV-1逆转录酶复合物模型,从中抽取出抑制剂分子的活性构象,进一步应用CoMFA和CoMSIA方法建立了具有较好预测能力的3D-QSAR模型,深入探讨了这些化合物的定量构效关系,为进一步的药物设计奠定了良好的基础.另外,以化合物13及其相应的β异构体24为代表,结合量子化学从头算分子轨道理论方法考察了它们的前线轨道,为阐明α和β系列化合物的活性差异提供了理论依据. 相似文献
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HEPT类逆转录酶抑制剂的三维定量构效关系 总被引:7,自引:0,他引:7
利用比较分子力场分析(CoMFA)方法对32个HEPT类HIV-1逆转录酶抑制剂(RTIs)的三维定量构效关系(3D-QSAR)进行了分析,建立了HIV-1逆转录酶抑制剂的3种3D-QSAR模型,发现影响其生物活性的主要因素为立体场因素,这与HIV-1RT的非底物结合部位(NNBS)的疏水性环境相吻合.进一步分析表明,适当长度的1-位侧链对保持化合物的抗病毒活性致关重要;增大5-位取代基的体积可增强生物活性;在1-位苄氧甲基的对位引入大体积基团有利于提高活性.同时考察立体场、静电场与生物活性的关系,表明,CoMFA模型为最佳预测模型,其交叉验证系数RCV2=0.870,传统相关系数R2=0.986,标准偏差SE=0.146,F=294.546.用此模型预测了检验组3个HEPT类化合物的-lgEC50,Rpred2=0.850,表明模型具有很好的预测能力,可为HEPT类HIV-1逆转录酶抑制剂的结构优化提供理论指导. 相似文献
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As one of the three viral encoded enzymes of HIV-1 infection, HIV-1 integrase has become an attractive drug target for the treatment. Diketoacid compounds (DKAs) are one kind of potent and selective inhibitors of HIV-1 IN. In the present work, two three-dimensional QSAR techniques (CoMFA and CoMSIA) were employed to correlate the molecular structure with the activity of inhibiting the strand transfer for 147 DKAs. The all-oritation search (AOS) and all-placement search (APS) were used to optimize the CoMFA model. The diketo and keto-enol tautomers of DKAs were also used to establish the CoMFA models. The results indicated that the enol was the dominant conformation in the HIV-1 IN and DKAs complexes. It can provide a new method and reference to identify the bioactive conformation of drugs by using QSAR analysis. The best CoMSIA model, with five fields combined, implied that the hydrophobic field is very important as well as the steric and electrostatic fields. All models indicated favorable internal validation. A comparative analysis with the three models demonstrated that the CoMFA model seems to be more predictive. The contour maps could afford steric, electrostatic, hydrophobic and H-bond information about the interaction of ligand-receptor complex visually. The models would give some useful guidelines for designing novel and potent HIV-1 integrase inhibitors. 相似文献
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