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首页> 外文期刊>Journal of bacteriology >The Periplasmic Protein MppA Requires an Additional Mutated Locus To Repress marA Expression in Escherichia coli
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The Periplasmic Protein MppA Requires an Additional Mutated Locus To Repress marA Expression in Escherichia coli

机译:周质蛋白MppA需要一个额外的突变的基因座,以抑制大肠杆菌中的marA表达。

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Escherichia coli strain TP985, which has an insertional mutation in the gene for the periplasmic murein tripeptide binding protein MppA, was previously reported to overproduce MarA and exhibit a multiple-antibiotic resistance (Mar) phenotype (H. Li and J. T. Park, J. Bacteriol. >181:4842-4847, 1999). We found that TP985 contained a previously unrecognized marR mutation which was responsible for the Mar phenotype. Transduction of the mppA mutation from TP985 to another wild-type strain did not affect antibiotic susceptibility. Overproduction of MppA repressed marA transcription in TP985 but not in other mppA or marR mutants. Therefore, TP985 contains an additional unknown mutation(s) that facilitates the repression of marA expression by MppA.
机译:以前报道了大肠埃希氏菌TP985菌株,该菌株在周质Murein三肽结合蛋白MppA的基因中有一个插入突变,该菌过表达MarA,并表现出多重抗生素耐药性(Mar)表型(H. Li和JT Park,J. Bacteriol。> 181: 4842-4847,1999)。我们发现TP985包含一个以前无法识别的 marR 突变,该突变与Mar表型有关。将TP985的 mppA 突变转导至另一株野生型菌株并不影响抗生素敏感性。 MppA的过量生产会抑制TP985中的 marA 转录,但不会抑制其他 mppA marR 突变体。因此,TP985包含一个额外的未知突变,这些突变有助于MppA抑制 marA 表达。

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