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Journal of Bacteriology, March 1999, p. 1767-1778, Vol. 181, No. 6
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Sequence of Shiga Toxin 2 Phage 933W from Escherichia coli O157:H7: Shiga Toxin as a Phage Late-Gene Productdagger

Guy Plunkett III,* Debra J. Rose, Timothy J. Durfee,Dagger and Frederick R. Blattner

Laboratory of Genetics, University of Wisconsin, Madison, Wisconsin 53706

Received 23 July 1998/Accepted 6 January 1999

Lysogenic bacteriophages are major vehicles for the transfer of genetic information between bacteria, including pathogenicity and/or virulence determinants. In the enteric pathogen Escherichia coli O157:H7, which causes hemorrhagic colitis and hemolytic-uremic syndrome, Shiga toxins 1 and 2 (Stx1 and Stx2) are phage encoded. The sequence and analysis of the Stx2 phage 933W is presented here. We find evidence that the toxin genes are part of a late-phage transcript, suggesting that toxin production may be coupled with, if not dependent upon, phage release during lytic growth. Another phage gene, stk, encodes a product resembling eukaryotic serine/threonine protein kinases. Based on its position in the sequence, Stk may be produced by the prophage in the lysogenic state, and, like the YpkA protein of Yersinia species, it may interfere with the signal transduction pathway of the mammalian host. Three novel tRNA genes present in the phage genome may serve to increase the availability of rare tRNA species associated with efficient expression of pathogenicity determinants: both the Shiga toxin and serine/threonine kinase genes contain rare isoleucine and arginine codons. 933W also has homology to lom, encoding a member of a family of outer membrane proteins associated with virulence by conferring the ability to survive in macrophages, and bor, implicated in serum resistance.

* Corresponding author. Mailing address: Laboratory of Genetics, University of Wisconsin, 445 Henry Mall, Madison, WI 53706. Phone: (608) 262-2534. Fax: (608) 263-7459. E-mail: ecoli{at}genetics.wisc.edu.

dagger Paper 3519 from the Laboratory of Genetics.

Dagger Present address: Department of Plant & Microbial Biology, University of California at Berkeley, Berkeley, CA 94720-3102.

Journal of Bacteriology, March 1999, p. 1767-1778, Vol. 181, No. 6
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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