Antibiotic-resistant bacterial infection has become epidemic all over the world. To overcome the drug resistance problem, antibacterial agents targeting at new binding sites become critical to solve this problem. FtsZ, a bacterial cell division protein, has become attractive as a new target for antibacterial agents discovery because it is the most important and conserved protein in bacterial cell division. In previous study, we found that our amine linked 2,4,6-trisubstituted pyrimidine derivatives can inhibit GTPase activity of FtsZ protein, and have strong inhibitory effects on both FtsZ polymerization and the growth of bacteria, including the drug-resistant strains. Based on these findings, we plan to continue this research in the following aspects..(1) Study the mechanism of action on the 2,4,6-trisubstituted pyrimidine derivatives which already synthesized (F06 and F07 derivatives). And interpret their binding modes in the FtsZ protein..(2) Based on the binding modes of GTP/GDP or inhibitors in the FtsZ protein, design and synthesis a small library of novel prymidine derivatives (60-80 compounds), and screening their inhibitory activities against FtsZ and bacterial strains;.(2) Potential hit compounds will be chosen to study their antibacterial activities against drug-resistant strains and the mechanism of action with FtsZ in details, and analyze their structure-activity relationship..This project can provide scientific evidences for the research of FtsZ inhibitors, and will provide new ideas and methodology for the development of novel antibacterial agents.
耐药性细菌感染已经成为威胁全人类健康的重大疾病之一,基于新型作用靶点与机制开发抗菌新药是解决这一难题的有效途径。FtsZ是细菌分裂的必需蛋白,在细菌分裂繁殖过程中起关键作用,并具有高度的序列保守性,是一个具有开发前景的抗菌药物新靶点。我们的前期研究发现2,4,6-三取代嘧啶衍生物(F06和F07系列)能抑制FtsZ的GTP水解活性和动态聚合,进而抑制细菌生长。本项目以此为基础,将开展以下研究内容:(1)深入研究现有嘧啶衍生物与FtsZ的相互作用机制和结合模式,为优化衍生物提供设计思路;(2)基于FtsZ与底物和抑制剂的结合模式,在2,4,6-三取代嘧啶的结构基础上,设计合成结构多样的FtsZ抑制剂,并进行活性筛选和建立构效关系;(3)挑选代表性衍生物进行抗耐药菌活性评价和作用机制研究。本项目的开展将为靶向FtsZ的抗菌药物研究提供科学依据,也为新型抗菌小分子的开发提供新的思路和方法学参考。
耐药性细菌感染已经成为威胁全人类健康的重大疾病之一,基于新型作用靶点与机制开发抗菌新药是解决这一难题的有效途径。FtsZ是细菌分裂的必需蛋白,在细菌分裂繁殖过程中起关键作用,并具有高度的序列保守性,是一个具有开发前景的抗菌药物新靶点。在本项目的资助下,结合申请人的前期研究成果,通过药物化学、分子药理学、生物化学等实验方法,发现了不同结构类型的FtsZ蛋白抑制剂,包括三取代嘧啶衍生物、噻唑橙衍生物母、苯并呋喃喹啉衍生物、吲哚乙烯取代喹啉衍生物等化合物。大部分药物小分子呈现出不同强度的抗菌活性。进一步的生物学及药理机制研究中发现,这些分子是通过干扰FtsZ蛋白的动态聚合,从而抑制FtsZ蛋白在细菌内形成Z 环,进而抑制细菌分裂,最后抑制细菌的生长繁殖。抗菌实验的结果表明,部分化合物具有很强的抗革兰氏阳性菌的活性,包括抗耐甲氧西林金黄色葡萄球菌(MRSA)、耐万古霉素肠球菌(VRE)的活性,MIC数值小于1 µg/mL,其抗菌能力强于万古霉素、甲氧西林等临床常用的抗生素。总的来说,本项目顺利完成了预期目标,为靶向FtsZ和细菌分裂的抗菌药物的开发提供了参考。
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数据更新时间:2023-05-31
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