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首页> 外文期刊>The Journal of Antibiotics: An International Journal >CRP regulator modulates multidrug resistance of Escherichia coli by repressing the mdtEF multidrug efflux genes.
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CRP regulator modulates multidrug resistance of Escherichia coli by repressing the mdtEF multidrug efflux genes.

机译:CRP调节剂通过抑制MDTEF多药渗透基因来调节大肠杆菌的多药抗性。

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摘要

Multidrug efflux pumps contribute to the resistance of Escherichia coli against many antibiotics and biocides. Here, we report that the CRP regulator modulates multidrug resistance in E. coli through repression of the genes encoding the MdtEF multidrug efflux pump. Screening of mutants for ability to increase beta-lactam resistance in E. coli led to the identification of a mutation in crp, which codes for the major global regulator of catabolite-sensitive operons. Deletion of crp significantly increased the resistance of the E. coli strain to oxacillin, azithromycin, erythromycin and crystal violet. The increase in drug resistance caused by crp deletion was completely suppressed by deletion of the multifunctional outer membrane channel gene tolC. TolC interacts with different drug efflux pumps. Among the twenty drug efflux pumps in E. coli, quantitative real-time PCR analysis showed that CRP repressed the expression of mdtEF. Deletion of mdtEF completely suppressed CRP-modulated multidrug resistance. Therefore, in addition to its role in catabolite control, CRP contributes to multidrug resistance in E. coli. Our results indicate that the CRP regulator modulates multidrug resistance in E. coli by repressing expression of the MdtEF multidrug efflux pump.
机译:Multidrug Efflux泵有助于对大肠杆菌的抵抗抵抗许多抗生素和杀生物剂。在这里,我们报告CRP调节器通过抑制编码MDTEF Multidrug Efflux泵的基因来调节大肠杆菌中的多药电阻。突变体筛选突变体,以增加大肠杆菌β-内酰胺抗性的能力导致CRP中的突变鉴定,该突变针对分解粘土敏感式操纵子的主要全球调节剂。缺失CRP显着提高了大肠杆菌菌株对恶毒素,阿奇霉素,红霉素和晶体紫的抗性。通过缺失多功能外膜通道基因Tolc完全抑制CRP缺失引起的药物抗性的增加。 Tolc与不同的药物流出泵相互作用。在大肠杆菌中的二十个药物流出泵中,定量实时PCR分析显示CRP压抑了MDTEF的表达。删除MDTEF完全抑制CRP调制的多药电阻。因此,除了其在Catabolite对照中的作用外,CRP还有助于大肠杆菌的多药耐药性。我们的结果表明,CRP调节剂通过压制MDTEF MultiDrug Efflux泵的表达来调节大肠杆菌中的多药电阻。

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