, Volume 8, Issue 1, pp 70–79 | Cite as

The nickel resistance determinant cloned from the enterobacterium Klebsiella oxytoca: conjugational transfer, expression, regulation and DNA homologies to various nickel-resistant bacteria

  • Ralf-Dietmar Stoppel
  • Maria Meyer
  • Hans Günter Schlegel
Research Papers


Klebsiella oxytoca strain CCUG 15788, isolated from a mineral oil emulsion tank in Göteborg, Sweden, was found to be nickel-resistant (tolerating 10 mm NiCl2 in non-complexing mineral-gluconate media; inducible resistance). The nickel resistance determinants were transferred by helper-assisted conjugation to various strains of Escherichia coli and Citrobacter freundii and expressed to between 5 and 10 mm NiCl2. A 4.3 kb HindIII fragment was cloned from the genomic DNA of K. oxytoca. Ligated into the vector pSUP202, the fragment caused constitutive nickel resistance (of up to 3 or 10 mm Ni2+) in various E. coli strains. After cloning into the broad host range vector pVDZ'2 the fragment even expressed low nickel resistance in the transconjugant of Alcaligenes eutrophus AE104. With the 4.3 kb HindIII fragment as a biotinylated DNA probe it was shown by DNA-DNA hybridization that the nickel resistance determinant resides on the chromosome of K. oxytoca and not on its circular plasmid pKO1 (160 kb) or linear plasmid pKO2 (50 kb). Nickel resistance strongly correlated with the presence of the 4.3 kb HindIII fragment in the transconjugants. No homologies were detected when the nickel resistance determinants of other well-known nickel-resistant bacteria, such as A. eutrophus CH34 or A. denitrificans 4a-2, were used as target DNA. Among the 60 strains examined, positive signals only appeared with the 3.1 kb DNA fragment from A. xylosoxydans 31A and the genomic DNA of two enterobacterial strains (5-1 and 5–5) isolated from nickel-rich soil in New Caledonia.


DNA-DNA homologies Klebsiella oxytoca nickel resistance transconjugants 


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Copyright information

© Rapid Communications of Oxford Ltd 1995

Authors and Affiliations

  • Ralf-Dietmar Stoppel
    • 1
  • Maria Meyer
    • 1
  • Hans Günter Schlegel
    • 1
  1. 1.Institut für Mikrobiologie der Georg-August-UniversitätGöttingenGermany

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