Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, PR China.
School of Pharmaceutical Sciences, Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chongqing University, Chongqing, 401331, PR China.
Eur J Med Chem. 2019 Apr 1;167:105-123. doi: 10.1016/j.ejmech.2019.01.072. Epub 2019 Feb 4.
A series of aminothiazolyl norfloxacin analogues as a new type of potential antimicrobial agents were synthesized and screened for their antimicrobial activities. Most of the prepared compounds exhibited excellent inhibitory efficiencies. Especially, norfloxacin analogue II-c displayed superior antimicrobial activities against K. pneumoniae and C. albicans with MIC values of 0.005 and 0.010 mM to reference drugs, respectively. This compound not only showed broad antimicrobial spectrum, rapid bactericidal efficacy and strong enzymes inhibitory potency including DNA gyrase and chitin synthase (CHS), low toxicity against mammalian cells and no obvious propensity to trigger the development of bacterial resistance, but also exerted efficient membrane permeability, and could effectively intercalate into K. pneumoniae DNA to form a steady supramolecular complex, which might block DNA replication to exhibit their powerful antimicrobial activity. Quantum chemical studies were also performed to explain the high antimicrobial activities. Molecular docking showed that compound II-c could bind with gyrase-DNA and topoisomerase IV-DNA through hydrogen bonds and π-π stacking.
一系列氨基噻唑基诺氟沙星类似物作为新型潜在抗菌剂被合成并筛选其抗菌活性。大多数所制备的化合物表现出优异的抑制效率。特别是，诺氟沙星类似物 II-c 对肺炎克雷伯菌和白色念珠菌具有优异的抗菌活性，MIC 值分别为 0.005 和 0.010mM，优于对照药物。该化合物不仅具有广谱抗菌谱、快速杀菌效果和对 DNA 回旋酶和几丁质合成酶 (CHS) 的强酶抑制作用，对哺乳动物细胞毒性低，且不易引发细菌耐药性的产生，还表现出有效的膜通透性，并能有效插入肺炎克雷伯菌 DNA 中形成稳定的超分子复合物，从而阻断 DNA 复制发挥其强大的抗菌活性。量子化学研究也解释了其高抗菌活性。分子对接表明，化合物 II-c 可以通过氢键和 π-π 堆积与 DNA 回旋酶-DNA 和拓扑异构酶 IV-DNA 结合。
