The multiple antibiotic resistance operon of enteric bacteria controls DNA repair and outer membrane integrity.

The multiple antibiotic resistance operon of enteric bacteria controls DNA repair and outer membrane integrity.
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DOI:
10.1038/s41467-017-01405-7
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发表时间:
2017-11-13
影响因子:
16.6
通讯作者:
Grainger DC
Grainger DC
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Sharma P;Haycocks JRJ;Middlemiss AD;Kettles RA;Sellars LE;Ricci V;Piddock LJV;Grainger DC

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大肠杆菌的多重抗生素耐药性(mar)操纵子是肠道细菌中染色体编码的抗生素耐药性的范例。该基因座通过两种编码的转录因子马尔R和MarA调节外排泵和孔蛋白表达的能力而被识别。在这里,我们绘制了这些监管机构在整个E。大肠杆菌基因组,并确定了广泛的MAR调节子。最值得注意的是,MarA激活DNA修复和脂质运输所需基因的表达。因此,mar基因座降低喹诺酮诱导的DNA损伤和四环素类药物穿过外膜的能力。这些以前未被识别的mar途径位于大多数肠道细菌共享的核心调节子内。因此,我们提供了一个框架,了解多药耐药性,介导的类似系统,跨肠杆菌科。转录因子马尔R和MarA通过调节外排泵和孔蛋白表达赋予肠道细菌多药耐药性Sharma等人的研究表明,MarA还上调脂质运输和DNA修复所需的基因,从而减少抗生素进入和喹诺酮诱导的DNA损伤。转录因子马尔R和MarA通过调节外排泵和孔蛋白表达赋予肠道细菌多药耐药性Sharma等人的研究表明,MarA还上调脂质运输和DNA修复所需的基因,从而减少抗生素进入和喹诺酮诱导的DNA损伤。
The multiple antibiotic resistance (mar) operon of Escherichia coli is a paradigm for chromosomally encoded antibiotic resistance in enteric bacteria. The locus is recognised for its ability to modulate efflux pump and porin expression via two encoded transcription factors, MarR and MarA. Here we map binding of these regulators across the E. coli genome and identify an extensive mar regulon. Most notably, MarA activates expression of genes required for DNA repair and lipid trafficking. Consequently, the mar locus reduces quinolone-induced DNA damage and the ability of tetracyclines to traverse the outer membrane. These previously unrecognised mar pathways reside within a core regulon, shared by most enteric bacteria. Hence, we provide a framework for understanding multidrug resistance, mediated by analogous systems, across the Enterobacteriaceae. Transcription factors MarR and MarA confer multidrug resistance in enteric bacteria by modulating efflux pump and porin expression. Here, Sharma et al. show that MarA also upregulates genes required for lipid trafficking and DNA repair, thus reducing antibiotic entry and quinolone-induced DNA damage. Transcription factors MarR and MarA confer multidrug resistance in enteric bacteria by modulating efflux pump and porin expression. Here, Sharma et al. show that MarA also upregulates genes required for lipid trafficking and DNA repair, thus reducing antibiotic entry and quinolone-induced DNA damage.
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