微生物与生化技术杂志

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Genome Sequencing Revealed Chromium and Other Heavy Metal Resistance Genes in E. cloacae B2-Dha

Aminur R, Björn O, Jana J, Neelu NN, Sibdas G and Abul M

The previously described chromium resistant bacterium, Enterobacter cloacae B2-DHA, was isolated from leather manufacturing tannery landfill in Bangladesh. Here we report the entire genome sequence of this bacterium containing chromium and other heavy metal resistance genes. The genome size and the number of genes, determined by massive parallel sequencing and comparative analysis with other known Enterobacter genomes, are predicted to be 4.22 Mb and 3958, respectively. Nearly 160 of these genes were found to be involved in binding, transport, and catabolism of ions as well as efflux of inorganic and organic compounds. Specifically, the presence of two chromium resistance genes, chrR and chrA was verified by polymerase chain reaction. The outcome of this research highlights the significance of this bacterium in bioremediation of chromium and other toxic metals from the contaminated sources.