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Appl Environ Microbiol. 1994 January; 60(1): 86-93

Distribution of the catabolic transposon Tn5271 in a groundwater bioremediation system.

R C Wyndham, C Nakatsu, M Peel, A Cashore, J Ng and F Szilagyi

Institute of Biology, Carleton University, Ottawa, Ontario, Canada.

ABSTRACT

The distribution of Tn5271-related DNA sequences in samples of groundwater and a groundwater bioremediation system at the Hyde Park (Niagara Falls, N.Y.) chemical landfill site was investigated. PCR amplification of target sequences within the cha genes of Tn5271 revealed similar sequences in the groundwater community and in samples from the sequencing batch reactors treating that groundwater. Cell dilution combined with PCR amplification indicated that cha sequences were carried in about 1 of 10 culturable bacteria from the treatment system. Characterization of isolates involved in chlorobenzoate and toluene biodegradation in the treatment system indicated that two phenotypic clusters, Alcaligenes faecalis type 2 and CDC group IVC-2, contained all of the Tn5271 probe-positive isolates from the community. These two groups differed phenotypically from recipient groups isolated following horizontal transfer of pBRC60 (Tn5271) in pristine freshwater microcosms. A genetic rearrangement in Tn5271 attributable to the intramolecular transposition of the flanking element IS1071R was detected in an isolate from the treatment system. Comparison of the structure of the intramolecular transposition derivative from groundwater isolate OCC13(pBRC13) with a laboratory-derived intramolecular transposition derivative of pBRC60 revealed similarities. The rearrangement was shown to increase the stability of the plasmid under starvation conditions.

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Appl Environ Microbiol. 1994 January; 60(1): 86-93

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