Structure–activity relationship study of novel iminothiadiazolo-pyrimidinone antimicrobial agents
作者:Atmika Paudel、Keiichi Kaneko、Ayako Watanabe、Matsunaga Shigeki、Kanai Motomu、Hiroshi Hamamoto、Kazuhisa Sekimizu
DOI:10.1038/ja.2013.69
日期:2013.11
An iminothiadiazolo-pyrimidinone derivative, 0002-04-KK, harboring a furan moiety, acts as an antimicrobial agent with a minimum inhibitory concentration (MIC) against Staphylococcus aureus of 25âμg mlâ1. Several derivatives of 0002-04-KK were synthesized and among them 0026-59-KK, harboring a nitrofuran moiety, had the most potent antimicrobial activity with an MIC of 6âμg mlâ1. Both 0002-04-KK and 0026-59-KK inhibited the biosynthesis of DNA, RNA and proteins. Peptidoglycan biosynthesis was inhibited by 0026-59-KK, and slightly inhibited by 0002-04-KK. Derivative 0002-04-KK showed bactericidal activity in contrast to the bacteriostatic activity of 0002-04-KK. Derivative 0002-04-KK had less toxicity in silkworms (lethal dose fifty (LD50): >230âμgâgâ1) than 0002-04-KK (LD50: 100âμgâgâ1). The bactericidal activity against S. aureus was because of the nitrofuran moiety. These findings suggest that iminothiadiazolo-pyrimidinone compounds could be used as lead molecules to develop antimicrobial agents.
一种含有呋喃部分的亚氨基噻二唑-嘧啶酮衍生物0002-04-KK,作为抗菌剂,对金黄色葡萄球菌的最小抑菌浓度(MIC)为25μg/ml。合成了数种0002-04-KK的衍生物,其中含有硝基呋喃部分的0026-59-KK具有最强的抗菌活性,MIC为6μg/ml。0002-04-KK和0026-59-KK均抑制DNA、RNA和蛋白质的生物合成。0026-59-KK抑制了肽聚糖的生物合成,而0002-04-KK仅轻微抑制。衍生物0002-04-KK表现出杀菌活性,而0002-04-KK则显示出抑菌活性。衍生物0002-04-KK在家蚕中的毒性低于0002-04-KK(半数致死量(LD50): >230μg/g,而0002-04-KK的LD50为100μg/g)。对金黄色葡萄球菌的杀菌活性归因于硝基呋喃部分。这些发现表明,亚氨基噻二唑-嘧啶酮化合物可以作为开发抗菌剂的候选分子。