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首页> 外文期刊>Journal of bacteriology >Characterization of the Escherichia coli AaeAB Efflux Pump: a Metabolic Relief Valve?
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Characterization of the Escherichia coli AaeAB Efflux Pump: a Metabolic Relief Valve?

机译:大肠杆菌AaeAB外排泵的特性:代谢释放阀?

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Treatment of Escherichia coli with p-hydroxybenzoic acid (pHBA) resulted in upregulation of yhcP, encoding a protein of the putative efflux protein family. Also upregulated were the adjacent genes yhcQ, encoding a protein of the membrane fusion protein family, and yhcR, encoding a small protein without a known or suggested function. The function of the upstream, divergently transcribed gene yhcS, encoding a regulatory protein of the LysR family, in regulating expression of yhcRQP was shown. Furthermore, it was demonstrated that several aromatic carboxylic acid compounds serve as inducers of yhcRQP expression. The efflux function encoded by yhcP was proven by the hypersensitivity to pHBA of a yhcP mutant strain. A yhcS mutant strain was also hypersensitive to pHBA. Expression of yhcQ and yhcP was necessary and sufficient for suppression of the pHBA hypersensitivity of the yhcS mutant. Only a few aromatic carboxylic acids of hundreds of diverse compounds tested were defined as substrates of the YhcQP efflux pump. Thus, we propose renaming yhcS, yhcR, yhcQ, and yhcP, to reflect their role in aromatic carboxylic acid efflux, to aaeR, aaeX, aaeA, and aaeB, respectively. The role of pHBA in normal E. coli metabolism and the highly regulated expression of the AaeAB efflux system suggests that the physiological role may be as a “metabolic relief valve” to alleviate toxic effects of imbalanced metabolism.
机译: p -羟基苯甲酸(pHBA)处理大肠杆菌导致 yhcP 上调,该蛋白编码一种假定的外排蛋白家族蛋白。邻近的基因 yhcQ (其编码膜融合蛋白家族的一种蛋白质)和 yhcR (其编码的一种小蛋白没有已知功能或建议功能)也被上调。显示了编码LysR家族调节蛋白的上游转录转录基因 yhcS 在调节 yhcRQP 表达中的功能。此外,已证明几种芳香族羧酸化合物可作为 yhcRQP 表达的诱导剂。由 yhcP 突变株对pHBA的超敏性证明了 yhcP 编码的外排功能。 yhcS 突变株也对pHBA敏感。表达 yhcQ yhcP 对于抑制 yhcS 突变体的pHBA超敏性是必要和充分的。 YhcQP外排泵的底物只定义了数百种测试化合物中的几种芳香族羧酸。因此,我们建议重命名 yhcS yhcR yhcQ yhcP ,以反映它们在芳族羧酸中的作用分别流出到 aaeR aaeX aaeA aaeB 。 pHBA在正常 E中的作用。大肠杆菌的代谢以及AaeAB外排系统的高度调控表达表明,生理作用可能是减轻代谢不平衡的毒性作用的“代谢释放阀”。

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