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Journal of Bacteriology, September 2003, p. 5182-5191, Vol. 185, No. 17
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.17.5182-5191.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

The SopE{Phi} Phage Integrates into the ssrA Gene of Salmonella enterica Serovar Typhimurium A36 and Is Closely Related to the Fels-2 Prophage

Cosima Pelludat,1 Susanne Mirold,2 and Wolf-Dietrich Hardt1*

Institute for Microbiology, D-BIOL, ETHZ, 8092 Zürich, Switzerland,1 Max von Pettenkofer Institute, 80336 Munich, Germany2

Received 7 April 2003/ Accepted 17 June 2003

Salmonella spp. are enteropathogenic gram-negative bacteria that use a large array of virulence factors to colonize the host, manipulate host cells, and resist the host's defense mechanisms. Even closely related Salmonella strains have different repertoires of virulence factors. Bacteriophages contribute substantially to this diversity. There is increasing evidence that the reassortment of virulence factor repertoires by converting phages like the GIFSY phages and SopE{Phi} may represent an important mechanism in the adaptation of Salmonella spp. to specific hosts and to the emergence of new epidemic strains. Here, we have analyzed in more detail SopE{Phi}, a P2-like phage from Salmonella enterica serovar Typhimurium DT204 that encodes the virulence factor SopE. We have cloned and characterized the attachment site (att) of SopE{Phi} and found that its 47-bp core sequence overlaps the 3' terminus of the ssrA gene of serovar Typhimurium. Furthermore, we have demonstrated integration of SopE{Phi} into the cloned attB site of serovar Typhimurium A36. Sequence analysis of the plasmid-borne prophage revealed that SopE{Phi} is closely related to (60 to 100% identity over 80% of the genome) but clearly distinct from the Fels-2 prophage of serovar Typhimurium LT2 and from P2-like phages in the serovar Typhi CT18 genome. Our results demonstrate that there is considerable variation among the P2-like phages present in closely related Salmonella spp.

* Corresponding author. Mailing address: Institute for Microbiology, ETHZ, Schmelzbergstr. 7, 8092 Zürich, Switzerland. Phone: 41-1-632-5143. Fax: 41-1-632-1129. E-mail: hardt{at}micro.biol.ethz.ch.

Journal of Bacteriology, September 2003, p. 5182-5191, Vol. 185, No. 17
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.17.5182-5191.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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