Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Characterization of a Chromosomal Nickel Resistance Determinant from Klebsiella oxytoca CCUG 15788

  • Park, Jae-Sun (Institute of Global Environment and Department of Biology, Kyung Hee University) ;
  • Lee, Sung-Jae (Institute of Global Environment and Department of Biology, Kyung Hee University) ;
  • Rhie, Ho-Gun (Institute of Global Environment and Department of Biology, Kyung Hee University) ;
  • Lee, Ho-Sa (Institute of Global Environment and Department of Biology, Kyung Hee University)
  • Published : 2008.06.30
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Abstract

Klebsiella oxytoca CCUG 15788 is resistant to $Ni^{2+}$ at a concentration of 10 mM and grows in an inducible manner when exposed to lower concentrations of $Ni^{2+}$. The complete genomic sequence of a 4.2-kb HindIII-digested fragment of this strain was determined from genomic DNA. It was shown to contain four nickel resistance genes (nirA, nirB, nirC, and nirD) encoding transporter and transmembrane proteins for nickel resistance. When the plasmid pKOHI4, encoding nirABCD, was transformed into Escherichia coli JM109, the cells were able to grow in Tris-buffered mineral medium containing 3 mM nickel. TnphoA'-1 insertion mutants in the four nickel genes nirA, nirB, nirC, and nirD showed nickel sensitivity. The nir genes were heterogeneously expressed in E. coli, suggesting functional roles of these genes in nickel resistance.

Keywords

References

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