Abstract
Hafnia alvei 5-5, isolated from a soil-litter mixture underneath the canopy of the nickel-hyperaccumulating tree Sebertia acuminata (Sapotaceae) in New Caledonia, was found to be resistant to 30 mM Ni2+ or 2 mM Co2+. The 70-kb plasmid, pEJH 501, was transferred by conjugation to Escherichia coli, Serratia marcescens, and Klebsiella oxytoca. Transconjugant strains expressed inducible nickel resistance to between 5 and 17 mM Ni2+, and cobalt resistance to 2 mM Co2+. A 4.8-kb Sal–EcoRI fragment containing the nickel resistance determinant was subcloned, and the hybrid plasmid was found to confer a moderate level of resistance to nickel (7 mM Ni2+) even to E. coli. The expression of nickel resistance was inducible by exposure to nickel chloride at a concentration as low as 0.5 mM Ni2+. By random TnphoA′-1 insertion mutagenesis, the fragment was shown to have structural genes as well as regulatory regions for nickel resistance. Southern hybridization studies showed that the nickel-resistance determinant from pEJH501 of H. alvei 5-5 was homologous to that of pTOM9 from Alcaligenes xylosoxydans 31A.
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Abbreviations
- MIC :
-
Minimal inhibitory concentration
- CFUs :
-
Colony-forming units
- ars :
-
Arsenite
- cnr :
-
Cobalt and nickel resistance
- czc :
-
Cadmium, zinc and cobalt
- ncc :
-
Nickel and cobalt
- nre :
-
Nickel resistance
- Tn:
-
Transposon
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Acknowledgements
The authors wish to acknowledge the financial support of the Korean Research Foundation made in the program year of 1998 (015-D00216) and the German Alexander von Humboldt-Stiftung. We thank Maria Meyer for excellent technical assistance and Dr. S. Verbarg, Deutsche Sammlung von Mikroorganismen, for help in identifying the isolates from New Caledonia soil.
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Park, J.E., Young, K.E., Schlegel, HG. et al. Conjugative plasmid mediated inducible nickel resistance in Hafnia alvei 5-5. Int Microbiol 6, 57–64 (2003). https://doi.org/10.1007/s10123-003-0101-8
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DOI: https://doi.org/10.1007/s10123-003-0101-8