A newly isolated aerobic hydrogen-oxidizing bacterium, Alcaligenes denitrificans strain 4a-2, differs from related autotrophic bacteria by containing only a single cytoplasmic, NAD-reducing hydrogenase, and by its high resistance to nickel ions, i.e. tolerance to 20 mM NiCl2. Strain 4a-2 harbors a single plasmid of about 250 kb. On helper-assisted mating of 4a-2 with Alcaligenes eutrophus strains H16,G29, and M85 nickelresistant transconjugants were selected; these did not contain the donor plasmid, however. All three transconjugants tolerated 3 to 10 mM NiCl2. The resistance was constitutively expressed. DNA/DNA hybridization showed homology with EcoRI-digested DNA of the wild type 4a-2 and transconjugants using a DNA probe containing nickel resistance genes of pMOL28. This indicated that the 4a-2 nickel resistance genes are located on the chromosome.
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Kaur, P., Roß, K., Siddiqui, R.A. et al. Nickel resistance of Alcaligenes denitrificans strain 4a-2 is chromosomally coded. Arch. Microbiol. 154, 133–138 (1990). https://doi.org/10.1007/BF00423322
- Alcaligenes denitrificans
- Alcaligenes eutrophus
- Nickel resistance