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. 1994 Jul;176(13):4034–4042. doi: 10.1128/jb.176.13.4034-4042.1994

Multiple replicons constituting the genome of Pseudomonas cepacia 17616.

H P Cheng 1, T G Lessie 1
PMCID: PMC205602  PMID: 7517389

Abstract

Macrorestriction fragment analysis of DNA from Pseudomonas cepacia 17616, in conjunction with Southern hybridization experiments using junction fragments containing rare restriction enzyme sites as probes, indicated that this bacterium contains three large circular replicons of 3.4, 2.5, and 0.9 megabases (Mb). Inclusion of the 170-kb cryptic plasmid present in this strain gave an overall estimate of genome size of 7 Mb. Other Southern hybridization experiments indicated that the three large replicons contained rRNA genes as well as insertion sequence elements identified previously in this strain. The distribution of SwaI, PacI, and PmeI sites on the three replicons was determined. A derivative of Tn5-751 carrying a SwaI site was used to inactivate and map genes on the 2.5- and 3.4-Mb replicons. Mutants were isolated in which the 2.5- and 0.9-Mb replicons had been reduced in size to 1.8 and 0.65 Mb, respectively. The loss of DNA from the 2.5-Mb replicon was associated with lysine auxotrophy, beta-lactamase deficiency, and failure to utilize ribitol and trehalose as carbon and energy sources. DNA fragments corresponding in size to randomly linearized forms of the different replicons were detected in unrestricted DNA by pulsed-field gel electrophoresis. The results provide a framework for further genetic analysis of strain 17616 and for evaluation of the genomic complexities of other P. cepacia isolates.

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