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Infection and Immunity, March 1999, p. 1415-1423, Vol. 67, No. 3
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

The Virulence Plasmid-Encoded impCAB Operon Enhances Survival and Induced Mutagenesis in Shigella flexneri after Exposure to UV Radiation

Laura J. Runyen-Janecky, Mei Hong,dagger and Shelley M. Payne*

Department of Microbiology and Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, Texas 78712-1095

Received 7 October 1998/Returned for modification 16 November 1998/Accepted 21 December 1998

Upon exposure to UV radiation, Shigella flexneri SA100 displayed survival and mutation frequencies comparable to those of Escherichia coli AB1157, which contains a functional UmuDC error-prone DNA repair system. Survival of SA100 after UV irradiation was associated with the presence of the 220-kb virulence plasmid, pVP. This plasmid encodes homologues of ImpA and ImpB, which comprise an error-prone DNA repair system encoded on plasmid TP110 that was initially identified in Salmonella typhimurium, and ImpC, encoded upstream of ImpA and ImpB. Although the impB gene was present in representatives of all four species of Shigella, not all isolates tested contained the gene. Shigella isolates that lacked impB were more sensitive to UV radiation than isolates that contained impB. The nucleotide sequence of a 2.4-kb DNA fragment containing the imp operon from S. flexneri SA100 pVP was 96% identical to the imp operon from the plasmid TP110. An SA100 derivative with a mutation in the impB gene had reduced survival following UV irradiation and less UV-induced mutagenesis relative to the parental strain. We also found that S. flexneri contained a chromosomally encoded umuDC operon; however, the umuDC promoter was not induced by exposure to UV radiation. This suggests that the imp operon but not the umuDC operon contributes to survival and induced mutagenesis in S. flexneri following exposure to UV radiation.

* Corresponding author. Mailing address: Department of Microbiology and Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712-1095. Phone: (512) 471-9258. Fax: (512) 471-7088. E-mail: payne{at}mail.utexas.edu.

dagger Present address: Chiron Corporation, Emeryville, CA 94608-2916.

Infection and Immunity, March 1999, p. 1415-1423, Vol. 67, No. 3
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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