In Silico Study and In Vitro Evaluation of Novel Synthesized Quinolone Derivatives Having Five-Membered Heterocyclic Moieties
作者:Mustafa Shihan、Ayad Raauf、Noor Naser
DOI:10.21608/ejchem.2021.92699.4390
日期:2021.9.29
Infectious diseases are caused by pathogens, such as viruses, bacteria, fungi, and parasites. Quinolones work by inhibition of bacterial topoisomerase IV and/or gyrase, a group of oxadiazole derivatives were incorporated into C7 piperazine ring of Gatifloxacin, a well-known antibacterial fluoroquinolone, in order to increase bulkiness at C7 leading to reduce bacterial resistance and improve anti-bacterial activity. In the current work , the synthesized compounds V(a-e) were screened for their antibacterial activity against gram negative bacteria: Klebsiella pneumonia and Escherichia coli and gram positive bacteria Streptococcus pyougenes and Staphylococcus aureus bacteria, the tested compounds showed an interesting activity against gram positive and gram negative bacteria, these tested compounds give significant antibacterial activity in comparison to Gatifloxacin as a starting compound and DMSO as a control, confirmations and characterization of the chemical structures related to these compounds were performed using 1H-NMR spectroscopy, FT-IR spectroscopy, and some physicochemical properties such as melting points. Docking study of the final synthesized compounds gave evidence about the affinity of these compounds toward topoisomerase IV enzyme, statistical results show the elevated inhibitory zones of the prepared compounds compared with Gatifloxacin, regarding S. aureus bacteria the inhibition zone elevated from 18mm in Gatifloxacin to 24 in (Vb and Ve) and 26mm in Vd, also for K. pneumonia bacteria the zone of inhibition raised from 18mm in Gatifloxacin to 20mm in Vb and 24mm in Ve.
传染病是由病毒、细菌、真菌和寄生虫等病原体引起的。喹诺酮类药物通过抑制细菌拓扑异构酶 IV 和/或回旋酶起作用,为了增加 C7 环的体积以降低细菌耐药性并提高抗菌活性,人们在著名的抗菌氟喹诺酮药物加替沙星的 C7 哌嗪环中加入了一组噁二唑衍生物。在目前的工作中,对合成的化合物 V(a-e)进行了抗革兰氏阴性菌的抗菌活性筛选:与作为起始化合物的加替沙星和作为对照的二甲基亚砜相比,这些测试化合物具有显著的抗菌活性。对最终合成的化合物进行的 Docking 研究证明了这些化合物对拓扑异构酶 IV 酶的亲和力,统计结果表明,与加替沙星相比,所制备化合物的抑菌区更大,对金黄色葡萄球菌的抑菌区从加替沙星的 18 毫米增至 Vb 和 Ve 的 24 毫米和 Vd 的 26 毫米,对肺炎双球菌的抑菌区也从加替沙星的 18 毫米增至 Vb 的 20 毫米和 Ve 的 24 毫米。