Regulation of Cu(I)/Ag(I) efflux genes in Escherichia coli by the sensor kinase CusS.

Regulation of Cu(I)/Ag(I) efflux genes in Escherichia coli by the sensor kinase CusS.
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DOI:
10.1111/j.1574-6968.2012.02529.x
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发表时间:
2012-05
影响因子:
2.1
通讯作者:
McEvoy MM
McEvoy MM
中科院分区:
生物学4区
文献类型:
--
作者:
Gudipaty SA;Larsen AS;Rensing C;McEvoy MM

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细菌广泛使用双组分系统来介导对各种环境刺激的适应性反应。大肠杆菌中的 CusR/CusS 双组分系统在 Cu(I) 和 Ag(I) 浓度升高的条件下诱导参与金属流出的基因表达。正如在大多数原型双组分系统中所见,信号识别和传输预计通过组氨酸激酶 CusS 的周质传感器结构域中的配体结合来发生。尽管现有文献中已有讨论,但很少有实验证据可以证实 CuS 在金属稳态中的作用。在这项研究中,我们表明 cusS 基因是大肠杆菌中 Cu(I) 和 Ag(I) 抗性所必需的,并且 CusS 与 cusCFBA 基因的表达相关。这些结果显示了 CusS 激活的金属依赖性机制,并表明大肠杆菌中 cusCFBA 表达的 Cu(I) 和 Ag(I) 依赖性上调中对 CusS 的绝对需要。
Two-component systems are widely used by bacteria to mediate adaptive responses to a variety of environmental stimuli. The CusR/CusS two-component system in Escherichia coli induces expression of genes involved in metal efflux under conditions of elevated Cu(I) and Ag(I) concentrations. As seen in most prototypical two-component systems, signal recognition and transmission is expected to occur by ligand binding in the periplasmic sensor domain of the histidine kinase CusS. Although discussed in the extant literature, little experimental evidence is available to establish the role of CusS in metal homeostasis. In this study, we show that the cusS gene is required for Cu(I) and Ag(I) resistance in E. coli and that CusS is linked to the expression of the cusCFBA genes. These results show a metal dependent mechanism of CusS activation and suggest an absolute requirement for CusS in Cu(I) and Ag(I)-dependent upregulation of cusCFBA expression in E. coli.
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