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Journal of Bacteriology, November 2002, p. 6050-6055, Vol. 184, No. 21
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.21.6050-6055.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Conserved Filamentous Prophage in Escherichia coli O18:K1:H7 and Yersinia pestis Biovar orientalis

Mark D. Gonzalez,1,{dagger} Carol A. Lichtensteiger,1 Ruth Caughlan,1,{ddagger} and Eric R. Vimr1*

Laboratory of Sialobiology, Department of Pathobiology, University of Illinois at Urbana-Champaign, Urbana, Illinois 618021

Received 30 April 2002/ Accepted 12 July 2002

Microbial virulence is known to emerge by horizontal gene transfer mechanisms. Here we describe the discovery of a novel filamentous prophage, designated CUS-1, which is integrated into the chromosomal dif homologue of the high-virulence clone Escherichia coli O18:K1:H7. An homologous chromosomal element (CUS-2) in Yersinia pestis biovar orientalis is integrated at the same relative location as CUS-1; both lysogenic E. coli and Y. pestis strains produce particles with properties expected of single-stranded DNA virions. CUS{phi} is epidemiologically correlated with the emergence of K1 strains with increased virulence and with the Y. pestis biovar responsible for the current (third) plague pandemic.

* Corresponding author. Mailing address: 2522 VMBSB, 2001 South Lincoln Avenue, Urbana, IL 61802. Phone: (217) 333-8502. Fax: (217) 244-7421. E-mail: e-vimr{at}uiuc.edu.

{dagger} Present address: Harvard Medical School, Boston, MA 02115.

{ddagger} Present address: Department of Molecular Biology and Microbiology, Tufts University, Boston, MA 02111.

Journal of Bacteriology, November 2002, p. 6050-6055, Vol. 184, No. 21
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.21.6050-6055.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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