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Infection and Immunity, March 2001, p. 1967-1970, Vol. 69, No. 3
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.3.1967-1970.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Neutralization of Shiga Toxins Stx1, Stx2c, and Stx2e by Recombinant Bacteria Expressing Mimics of Globotriose and Globotetraose

Adrienne W. Paton,1,2 Renato Morona,2 and James C. Paton1,2,*

Molecular Microbiology Unit, Women's and Children's Hospital, North Adelaide, South Australia 5006,1 and Department of Molecular Biosciences, Adelaide University, Adelaide, South Australia 5005,2 Australia

Received 9 August 2000/Returned for modification 29 September 2000/Accepted 28 November 2000

Strains of Escherichia coli producing Shiga toxins Stx1, Stx2, Stx2c, and Stx2d cause gastrointestinal disease and the hemolytic-uremic syndrome in humans. We have recently constructed a recombinant bacterium which displays globotriose (the receptor for these toxins) on its surface and adsorbs and neutralizes these Shiga toxins with very high efficiency. This agent has great potential for the treatment of humans with such infections. E. coli strains which cause edema disease in pigs produce a variant toxin, Stx2e, which has a different receptor specificity from that for the other members of the Stx family. We have now modified the globotriose-expressing bacterium such that it expresses globotetraose (the preferred receptor for Stx2e) by introducing additional genes encoding a N-acetylgalactosamine transferase and a UDP-N-acetylgalactosamine-4-epimerase. This bacterium had a reduced capacity to neutralize Stx1 and Stx2c in vitro, but remarkably, its capacity to bind Stx2e was similar to that of the globotriose-expressing construct; both constructs neutralized 98.4% of the cytotoxicity in lysates of E. coli JM109 expressing cloned stx2e. These data suggest that either globotriose- or globotetraose-expressing constructs may be suitable for treatment and/or prevention of edema disease in pigs.

* Corresponding author. Mailing address: Department of Molecular Biosciences, Adelaide University, Adelaide, S.A. 5005, Australia. Phone: 61-8-83035929. Fax: 61-8-83033262. E-mail: james.paton{at}adelaide.edu.au.

Infection and Immunity, March 2001, p. 1967-1970, Vol. 69, No. 3
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.3.1967-1970.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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