In this study, a combined in vitro antifungal and enzymatic studies with molecular modeling techniques are presented. Although attempts with rational design strategies have been made, the bioactivity of studied 1-substituted 4- ethoxycarbonylmethylthiosemicarbazides 1a-1g was only marginal. Among the compounds tested, antifungal response was observed only for indole derivative 1f and pyrazine derivative 1g. The most important results of the antifungal screening assay can be summarized as follows: (i) the replacement of an aryl ring in 4-arylthiosemicarbazides with a flexible chain reduces antifungal response dramatically, (ii) NH-NH-C(=S)-NH core seems to be important for antifungal activity of thiosemicarbazides. Based on docking simulations fungal secreted aspartic proteinase (SAP) was proposed as the putative enzyme target for thiosemicarbazide derivatives with a flexible chain at the N4 position of thiosemicarbazide core.
本研究结合分子建模技术进行了体外抗真菌和酶学研究。虽然尝试了合理的设计策略,但所研究的 1-取代 4-乙氧基羰基甲基
硫代
氨基甲酸酯 1a-1g 的
生物活性微乎其微。在测试的化合物中,只有
吲哚衍
生物 1f 和
吡嗪衍
生物 1g 出现了抗真菌反应。抗真菌筛选试验最重要的结果可归纳如下:(i) 用柔性链取代 4-芳基
硫代
氨基甲酸苷中的芳基环会显著降低抗真菌反应,(ii) NH-NH-C(=S)-NH 核心似乎对
硫代
氨基甲酸苷的抗真菌活性很重要。根据对接模拟,真菌分泌的
天冬氨酸蛋白酶(
SAP)被认为是
硫代
氨基
脲核心 N4 位具有柔性链的
硫代
氨基
脲衍
生物的假定酶靶。