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. 1989 Jun;55(6):1523–1530. doi: 10.1128/aem.55.6.1523-1530.1989

Novel Alterations in Plasmid DNA Associated with Aromatic Hydrocarbon Utilization by Pseudomonas putida R5-3

Brian F Carney 1,†, J V Leary 1,*
PMCID: PMC202898  PMID: 16347946

Abstract

Subcultures of Pseudomonas putida R5-3 altered their plasmid DNA content in specific ways depending on the particular aromatic hydrocarbon utilized as the sole carbon source. Two indigenous plasmids, 115 and 95 kilobases (kb) in size, were observed in R5-3A, which was derived from R5-3 by growth on minimal medium containing p-methylbenzoate as the sole carbon source. When R5-3A was transferred to medium containing m-xylene or toluene, derivative strains were obtained in which the 95-kb plasmid was lost and a new plasmid of 50 or 60 kb appeared. Reversion to the original plasmid profile of R5-3A was observed when xylene- or toluene-grown cells were returned to medium containing p-methylbenzoate. Restriction enzyme analysis and Southern blot hybridizations of total plasmid DNA indicated deletions and rearrangements of DNA restriction fragments in the derivatives maintained on m-xylene and toluene when compared with the original R5-3A. In the derivatives which retrieved the original plasmid profile, the restriction enzyme fragment pattern was identical to that in the original R5-3A, in that the fragments which were missing after growth on m-xylene or toluene were again present. Southern blot hybridizations revealed that part of the plasmid DNA lost from the original plasmid profile was integrated into the chromosomal DNA of xylene-grown R5-3B and that these plasmid fragments were associated with aromatic hydrocarbon metabolism. Hybridization with pathway-specific DNA fragments from the TOL plasmid pWWO indicated that this 95-kb plasmid contains DNA homologous to the meta-fission pathway genes.

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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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