Discovery of Benzimidazole–Quinolone Hybrids as New Cleaving Agents toward Drug‐Resistant Pseudomonas aeruginosa DNA,ChemMedChem

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Discovery of Benzimidazole–Quinolone Hybrids as New Cleaving Agents toward Drug‐Resistant Pseudomonas aeruginosa DNA
ChemMedChem ( IF 3.6 ) Pub Date : 2018-04-16 , DOI: 10.1002/cmdc.201700739
Ya-Nan Wang ₁ , Rammohan R. Yadav Bheemanaboina ₁ , Wei-Wei Gao ₁ , Jie Kang ₁ , Gui-Xin Cai ₁ , Cheng-He Zhou ₁

Affiliation

A series of benzimidazole–quinolone hybrids as new potential antimicrobial agents were designed and synthesized. Bioactive assays indicated that some of the prepared compounds exhibited potent antibacterial and antifungal activities. Notably, 2‐fluorobenzyl derivative 5 b (ethyl 7‐chloro‐6‐fluoro‐1‐[[1‐[(2‐fluorophenyl)methyl]benzimidazol‐2‐yl]methyl]‐4‐oxo‐quinoline‐3‐carboxylate) showed remarkable antimicrobial activity against resistant Pseudomonas aeruginosa and Candida tropicalis isolated from infected patients. Active molecule 5 b could not only rapidly kill the tested strains, but also exhibit low toxicity toward Hep‐2 cells. It was more difficult to trigger the development of bacterial resistance of P. aeruginosa against 5 b than that against norfloxacin. Molecular docking demonstrated that 5 b could effectively bind with topoisomerase IV–DNA complexes, and quantum chemical studies theoretically elucidated the good antimicrobial activity of compound 5 b. Preliminary experimental reaction mechanism exploration suggested that derivative 5 b could not intercalate into DNA isolated from drug‐resistant P. aeruginosa, but was able to cleave DNA effectively, which might further block DNA replication to exert powerful bioactivities. In addition, compound 5 b is a promising antibacterial agent with membrane disruption abilities.

中文翻译：

发现苯并咪唑-喹诺酮杂种作为抗药性铜绿假单胞菌DNA的新裂解剂

设计并合成了一系列作为新型潜在抗菌剂的苯并咪唑-喹诺酮杂化物。生物活性测定表明，一些制备的化合物表现出有效的抗菌和抗真菌活性。值得注意的是，2-氟苄基衍生物5 b（乙基7-氯-6-氟-1-基[[1-[（（2-氟苯基）甲基]苯并咪唑-2-基]甲基] -4-氧-喹啉-3-羧酸酯）对分离自感染患者的铜绿假单胞菌和热带假丝酵母具有显着的抗菌活性。活性分子5b不仅可以迅速杀死测试的菌株，而且对Hep-2细胞的毒性低。触发铜绿假单胞菌细菌耐药性的发展更加困难与针对诺氟沙星的5b相比。分子对接表明5b可以与拓扑异构酶IV-DNA复合物有效结合，并且量子化学研究从理论上阐明了化合物5b的良好抗菌活性。初步的实验反应机理探索表明，衍生物5b不能插入从耐药铜绿假单胞菌分离的DNA中，但能够有效切割DNA，这可能进一步阻止DNA复制，从而发挥强大的生物活性。另外，化合物5b是具有膜破坏能力的有前途的抗菌剂。

更新日期：2018-04-16

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