Improved Inhibitors of Trypanothione Reductase by Combination of Motifs: Synthesis, Inhibitory Potency, Binding Mode, and Antiprotozoal Activities
作者:Christian Eberle、Birgit Sophia Lauber、Daniel Fankhauser、Marcel Kaiser、Reto Brun、R. Luise Krauth-Siegel、François Diederich
DOI:10.1002/cmdc.201000420
日期:2011.2.7
enzyme over the related human glutathione reductase (hGR), as was predicted by our molecular modeling studies. In vitro studies showed IC50 values in the low micromolar to submicromolar range against Trypanosoma brucei rhodesiense, often in combination with low cytotoxicity against mammalian cells. Interestingly, even stronger activities were found against Plasmodium falciparum.
锥虫硫磷还原酶(TR)是锥虫病寄生虫基于锥虫硫酮的氧化还原代谢中的一种必不可少的酶。该系统在人类中不存在,因此,为开发针对非洲昏睡病和恰加斯病的选择性新药提供了有希望的目标。在过去的二十年中,发现了多种寄生酶的非肽小分子配体。当前的目标是破译这些已知抑制剂的结合模式,以优化其结构。我们分析了最近报道的1-(1-(苯并[ b]]噻吩-2-基)环己基)哌啶(BTCP)类似物,使用计算机建模方法。这使我们得出结论,与基于二芳基硫醚的抑制剂类别相比,类似物占据了活性部位的不同区域。与相应的母体化合物相比,两个基序的组合显着提高了对酶的亲和力。新合成的缀合物显示出ķ IC值TR低至0.51±0.1μ中号和用于在相关的人类谷胱甘肽还原酶(的hGR)的寄生酶高选择性,因为是由我们的分子建模研究预测。体外研究表明,针对布鲁氏锥虫的IC 50值在低微摩尔至亚微摩尔范围内,通常与针对哺乳动物细胞的低细胞毒性相