From Phenothiazine to 3-Phenyl-1,4-benzothiazine Derivatives as Inhibitors of the <i>Staphylococcus aureus</i> NorA Multidrug Efflux Pump
作者:Stefano Sabatini、Glenn W. Kaatz、Gian Maria Rossolini、David Brandini、Arnaldo Fravolini
DOI:10.1021/jm701623q
日期:2008.7.1
Overexpression of efflux pumps is an important mechanism by which bacteria evade effects of substrate antimicrobial agents and inhibition of such pumps is a promising strategy to circumvent this resistance mechanism. NorA is a Staphylococcus aureus multidrug efflux pump, the activity of which confers decreased susceptibility to many structurally unrelated agents, including fluoroquinolones, resulting
外排泵的过表达是细菌逃避底物抗微生物剂作用的重要机制,抑制这种泵是规避这种耐药机制的有前途的策略。NorA是金黄色葡萄球菌多药外排泵,其活动使许多非结构相关药物(包括氟喹诺酮)的药敏性降低,从而导致了多药耐药(MDR)表型。在这项工作中,设计并合成了一系列1,4-苯并噻嗪衍生物,作为吩噻嗪MDR外排泵抑制剂(EPI)的最小化结构模板,以努力确定更有效的金黄色葡萄球菌NorA EPI。与环丙沙星合用时,几乎所有评估的衍生物均表现出良好的抗金黄色葡萄球菌ATCC 25923的活性。其中一些能够完全恢复在norA过表达菌株(SA-K2378)中的环丙沙星活性。在溴化乙锭(EtBr)外排抑制试验中,化合物6k和7j对SA-1199B(也过表达norA的菌株)显示出良好的活性。