Remediation of environmetal pollution by the recombinant Escherichia coli accumulating cesium in the cell

点击翻译按钮获取中文摘要

The purpose of this study is to design and construct the recombinant Escherichia coli, accumulating cesium ion in the cell. We showed genomic changes of metal-transporter and metal-binding protein increase the level of intracellular metal in E. coli in the cases of molybdenum and manganese. To identify the genes for cesium-transporter and cesium-binding protein in E. coli, we carried out transcriptome analysis. The result showed three genes, each encoding a putative metal-binding transcription factor, were increased by addition of cesium chloride. The deletion of these genes each increased the sensibility to high concentration of cesium. These results suggest that the identified genes involved in response to extracellular cesium in E. coli and are targets for genomic change to accumulate intracellular cesium ion in a cell.