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. 1991 Nov;57(11):3079–3085. doi: 10.1128/aem.57.11.3079-3085.1991

Determinants Encoding Resistance to Several Heavy Metals in Newly Isolated Copper-Resistant Bacteria

Cathrin Dressler 1,†, Ursula Kües 1,‡, Dietrich H Nies 1, Bärbel Friedrich 1,*
PMCID: PMC183930  PMID: 16348575

Abstract

Three copper-resistant, gram-negative bacteria were isolated and characterized. Of the three strains, Alcaligenes denitrificans AH tolerated the highest copper concentration (MIC = 4 mM CuSO4). All three strains showed various levels of resistance to other metal ions. A. denitrificans AH contains sequences which cross-hybridized with the mer (mercury resistance) determinant of Tn21 and the czc (cobalt, zinc, and cadmium resistance), cnr (cobalt and nickel resistance), and chr (chromate resistance) determinants of A. eutrophus CH34. DNA-DNA hybridization with probes prepared from A. eutrophus CH34 and Tn21 revealed the presence of chr-, cnr-, and mer-like sequences on the 200-kb plasmid pHG27 and of czc, cnr, and mer homologs located on the chromosome. The second strain, classified as Alcaligenes sp. strain PW, carries czc, cnr, and mer homologs on the 240-kb plasmid pHG29-c and a chr determinant on the 290-kb plasmid pHG29-a; a third plasmid, the 260-kb large plasmid pHG29-b, is cryptic. In contrast to the Alcaligenes strains, which were isolated from metal-contaminated water, Pseudomonas paucimobilis CD was isolated from the air. This strain harbors two cryptic plasmids: the 210-kb large plasmid pHG28-a and the 40-kb plasmid pHG28-b. Southern analysis revealed no homology between the metal ion resistance determinants of A. eutrophus CH34 and P. paucimobilis CD.

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Selected References

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