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. 1994 Mar;60(3):973–978. doi: 10.1128/aem.60.3.973-978.1994

Transfer and expression of degradative and antibiotic resistance plasmids in acidophilic bacteria.

A Quentmeier 1, C G Friedrich 1
PMCID: PMC201419  PMID: 8161188

Abstract

The genetic accessibility of selected acidophilic bacteria was investigated to evaluate their applicability to degrading pollutants in acidic environments. The IncP1 antibiotic resistance plasmids RP4 and pVK101 and the phenol degradation-encoding plasmid pPGH11 were transferred from neutrophilic bacteria into the extreme acidophilic eubacterium Acidiphilium cryptum at frequencies of 1.8 x 10(-2) to 9.8 x 10(-4) transconjugants per recipient cell. The IncQ antibiotic resistance plasmid pSUP106 was mobilizable to A. cryptum by triparental matings at a frequency of 10(-5) transconjugants per recipient cell. In the transconjugants, antibiotic resistances and the ability to degrade phenol were expressed. A. cryptum AC6 (pPGH11) grew with 2.5 mM phenol at a doubling time of 12 h and a yield of 0.52 g (dry cell weight) per g of phenol. A. cryptum harbored five native plasmids of 255 to 6.3 kb in size. Plasmids RP4 and pVK101 were transferred from Escherichia coli into Acidobacterium capsulatum at frequencies of 10(-3) and 2.3 x 10(-4) and to the facultative autotroph Thiobacillus acidophilus at frequencies of 1.1 x 10(-5) and 2.9 x 10(-6) transconjugants per recipient cell, respectively. Plasmid pPGH11 could not be transferred into the latter strains. T. acidophilus wild type contained six so far cryptic plasmids of 220 to 5 kb.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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