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Microbiology 140 (1994), 43-48
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microbiology, Vol 140, 43-48, Copyright © 1994 by Society for General Microbiology

ARTICLES

IncN plasmids mediate UV resistance and error-prone repair in Pseudomonas aeruginosa PAO

TA Kokjohn and RV Miller
School of Biological Sciences, University of Nebraska-Lincoln 68588- 0118.

While it seems likely that the ability to induce the expression of recA- controlled genes is nearly universal among the eubacteria, the expression of plasmid-borne ultraviolet (UV-resistance and mutagenesis genes seems to be species-dependent in a complex fashion. Some plasmids encoding UV-resistance and mutagenesis functions only express these phenotypes in a select number of bacterial species. Several UV- resistance plasmids that express these functions in Escherichia coli are either unstable or simply do not express the UV-resistance- mutagenesis phenotype in Pseudomonas aeruginosa. In order to clarify the role of these plasmids in microbial ecology, we have undertaken a study of the ability of the well-characterized UV-resistance IncN plasmids pKM101 and R46 to express the UV-resistance phenotype in P. aeruginosa. In addition, we have examined the IncP plasmids RP4 and R68.45, observed to confer a UV-resistant phenotype upon Myxococcus xanthus, for the ability to express this phenotype in P. aeruginosa. Our experiments reveal that while pKM101 and R46 transfer to P. aeruginosa at a very low frequency, these plasmids, once transferred, are maintained and clearly support the expression of the UV-resistance and mutagenesis phenotype observed in E. coli. Studies of plasmids R68.45 and RP4 in P. aeruginosa revealed that they do not express UV- resistance functions in this species. UV-resistance plasmids may play an important role in the natural ecology of bacterial habitats exposed to solar radiation or to various DNA-damaging natural and man-made chemicals.


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V. Fernandez Zenoff, F. Sineriz, and M. E. Farias
Diverse Responses to UV-B Radiation and Repair Mechanisms of Bacteria Isolated from High-Altitude Aquatic Environments
Appl. Envir. Microbiol., December 1, 2006; 72(12): 7857 - 7863.
[Abstract] [Full Text] [PDF]


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