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甲基苯并唑衍生物与HIV-1逆转录酶相互作用的分子模拟研究|苯并嘧啶衍生物

发布时间:2019-06-11 11:00:53 影响了:

  摘要:对HIV-1逆转录酶(RT)与二氟甲基苯并唑甲基嘧啶硫醚(DFMMT)及甲基苯并唑甲基嘧啶硫醚(MMT)两个甲基苯并唑衍生物的复合物进行了分子动力学模拟,从分子整体、结合模式优化和水分子作用3个角度详细分析了甲基苯并唑衍生物与HIV-1 RT相互识别的机制。结果表明,DFMMT和MMT在RT中的结合位点几乎一致;但DFMMT与RT的π-π堆积作用更强。另外,RT的DFMMT结合口袋中有3个稳定的水分子存在,而MMT结合则没有水分子参与。3个水分子的协同使得DFMMT与RT的相互作用强于MMT,这可能是双氟促进抑制活性的作用机制之一。
  关键词:甲基苯并唑衍生物;HIV-1逆转录酶;分子动力学模拟;双氟;抑制活性
  中图分类号:R512.91;R978.7 文献标识码:A 文章编号:0439-8114(2012)15-3358-04
  Molecular Modeling Study on the Interactions between Methylbenzoxazole Derivatives and HIV-1 Reverse Transcriptase
  HU Jian-ping1,TANG Dian-yong1,SUN Guo-feng1,CHENG Ying1,CHANG Shan2
  (1. College of Chemistry and Life Science, Leshan Normal University, Leshan 614004, Sichuan, China;
  2. College of Informatics, South China Agricultural University, Guangzhou 510642, China)
  Abstract:Two molecular dynamics simulations were performed for HIV-1 RT complexed with two methylbenzoxazole derevatives, difluoro-methylbenzoxazole methylpyrimidine thioether (DFMMT) and methylbenzoxazole methylpyrimidine thioether(MMT). The inter-recognition between HIV-1 RT and two methylbenzoxazole derevatives were detailedly analyzed from the aspects of overall structure, binding modes minimization and the key role of water molecules. The results showed that the binding site between DFMMT and RT was almost the same with that of MMT, while the π-π stacking action of DFMMT with RT was stronger than of MMT. In addition, it was found that there were three stably water molecules existing in the binding pocket of RT for DFMMT, while no water participated in the association between RT and high hydrophobic MMT. The cooperation of the three water molecules made the interaction between DFMMT and RT stronger than that of MMT, which may be one of the action mechanisms of difluorin favoring the inhibitory activity.
  Key words:methylbenzoxazole; HIV-1 reverse transcriptase; molecular dynamics simulation; difluorin; inhibitory activity
  HIV-1逆转录酶(Reverse transcriptase, RT)将融入到宿主细胞中的单链病毒DNA催化合成双链病毒前DNA,是HIV生命周期中必不可少的一个步骤,也是抗HIV药物的靶点。非核苷类逆转录酶抑制剂(Non-nucleoside reverse transcriptase inhibitors,NNRTIs)能竞争性抑制HIV-1 RT,阻碍病毒前DNA的合成,在治疗艾滋病中起着重要的作用[1-4]。二氟甲基苯并唑甲基嘧啶硫醚(Difluoro-methylbenzoxazole methylpyrimidine thioether,DFMMT)(图1A)是一种非常有潜力的NNRTIs先导化合物[5],研究表明,甲基苯并唑官能团对于维持该分子的抑制活性必不可少,而双氟取代对于其维持高活性十分关键,与之相对的的甲基苯并唑甲基嘧啶硫醚(Methylbenzoxazole methylpyrimidine thioether,MMT)(图1B)的活性则较低[6]。尽管之前有一系列对DFMMT及MMT的改造研究,但是水分子在这些甲基苯并唑衍生物发挥抑制作用时的角色,以及DFMMT的抑制剂活性远高于MMT的原因尚未被阐明,本研究就这些问题进行探讨,为NNRTIs的开发提供参考。

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