The replication of HIV-1 requires the integration of its cyclic DNA into host DNA by HIV-1 integrase （IN）, which includes two important reactions, 3＇-processing and strand transfer, both catalyzed by HIV-1 IN. Disrupting either of the reactions will fulfill the purpose of inhibiting the replication of HIV-1. In this paper, pharmacophore modeling and molecular docking are employed to investigate the inhibition mechanism of the HIV-1 IN strand transfer inhibitors （INSTIs）. Based on the results, we suggest that the inhibition mechanism of INSTIs involves the inhibitor chelating the cofactors Mg2＋ and its forming hydrogen bonds with some crucial residues adjacent to the DDE active center.
目的:探究影响人类免疫缺陷病毒Ⅰ型(human immunodeficiency virus type 1,HIV-1)非核苷类逆转录酶抑制剂6-苄基-1-乙氧甲基-5-异丙基尿嘧啶[6-benzyl-1-(ethoxymethyl)-5-isopropyluracil,MKC-442]及其类似物抗病毒活性的主要分子微观结构因素。方法:针对45个MKC-442及其类似物,利用遗传函数逼近法(genetic function approximation,GFA)构建10个抗HIV-1活性与优选的分子结构描述符之间的二维定量构效关系(2-dimensional quantitative structure-activity relationship,2D-QSAR)模型,从中挑选出最优模型并对其进行验证,据此阐明影响MKC-442及其类似物抗HIV-1活性的主要微观结构因素。结果:最优2D-QSAR模型的非交叉验证相关系数r2为0.7845,交叉验证相关系数q2为0.6958,预测验证相关系数r2pred为0.8415,表明其具有较高的预测能力和稳定性。结论:研究表明,MKC-442及其类似物抗HIV-1活性主要与描述符JursFNSA2,ShadowYZ,DipoleX,Kappa3AM和CHIV3P相关,为MKC-442及其类似物的进一步结构修饰打下了一定的理论基础。
