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Infection and Immunity, March 2000, p. 1400-1407, Vol. 68, No. 3
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Iha: a Novel Escherichia coli O157:H7 Adherence-Conferring Molecule Encoded on a Recently Acquired Chromosomal Island of Conserved Structure

Phillip I. Tarr,1,2,3,* Sima S. Bilge,1,2 James C. Vary Jr.,1 Srdjan Jelacic,1,2 Rebecca L. Habeeb,1 Teresa R. Ward,1 Michael R. Baylor,1 and Thomas E. Besser4

Division of Gastroenterology, Children's Hospital and Regional Medical Center,1 and Departments of Pediatrics2 and Microbiology,3 University of Washington School of Medicine, Seattle, and the Department of Veterinary Microbiology and Pathology, Washington State University College of Veterinary Medicine, Pullman,4 Washington

Received 10 September 1999/Returned for modification 10 November 1999/Accepted 23 November 1999

The mechanisms used by Shiga toxin (Stx)-producing Escherichia coli to adhere to epithelial cells are incompletely understood. Two cosmids from an E. coli O157:H7 DNA library contain an adherence-conferring chromosomal gene encoding a protein similar to iron-regulated gene A (IrgA) of Vibrio cholerae (M. B. Goldberg, S. A. Boyko, J. R. Butterton, J. A. Stoebner, S. M. Payne, and S. B. Calderwood, Mol. Microbiol. 6:2407-2418, 1992). We have termed the product of this gene the IrgA homologue adhesin (Iha), which is encoded by iha. Iha is 67 kDa in E. coli O157:H7 and 78 kDa in laboratory E. coli and is structurally unlike other known adhesins. DNA adjacent to iha contains tellurite resistance loci and is conserved in structure in distantly related pathogenic E. coli, but it is absent from nontoxigenic E. coli O55:H7, sorbitol-fermenting Stx-producing E. coli O157:H-, and laboratory E. coli. We have termed this region the tellurite resistance- and adherence-conferring island. We conclude that Iha is a novel bacterial adherence-conferring protein and is contained within an E. coli chromosomal island of conserved structure. Pathogenic E. coli O157:H7 has only recently acquired this island.

* Corresponding author. Mailing address: MS: CH-24, Children's Hospital and Regional Medical Center, 4800 Sand Point Way NE, Seattle, WA 98105. Phone: (206) 526-2521. Fax: (206) 528-2721. E-mail: tarr{at}u.washington.edu.

Infection and Immunity, March 2000, p. 1400-1407, Vol. 68, No. 3
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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