Protective immunization of mice with an active-site mutant of subtilase cytotoxin of Shiga toxin-producing Escherichia coli.
We have recently described a novel AB(5) cytotoxin produced by certain Shiga toxin-producing Escherichia coli strains. The A subunit of this toxin is a subtilase-like serine protease, while the B pentamer mediates binding to host cell glycolipid receptors. The subtilase cytotoxin is lethal for mice, causing extensive microvascular thrombosis as well as necrosis in the brain, kidneys, and liver. In the present study, we have immunized mice with a purified derivative of the toxin with a Ser272 --> Ala mutation in the A subunit which abolishes cytotoxicity. This elicited strong antibody responses, as judged by enzyme-linked immunosorbent assay, which conferred protection against intraperitoneal challenge with purified toxin. Immunized mice were also protected from weight loss resulting from oral challenge with an E. coli K-12 clone expressing the active toxin.
School of Molecular and Biomedical Science, University of Adelaide, Adelaide, S.A., 5005, Australia.
Ursula M
UM
Talbot
James C
JC
Paton
Adrienne W
AW
Paton
D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D001665:Binding Sites; D003603:Cytotoxins / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D004926:Escherichia coli / Q000201:enzymology / Q000472:pathogenicity*; D022361:Escherichia coli Vaccines / Q000276:immunology*; D007114:Immunization; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009154:Mutation; D021122:Protein Subunits; D012697:Serine Endopeptidases / Q000276:immunology*; D022621:Shiga Toxin / Q000096:biosynthesis*
D000907:Antibodies, Bacterial; D003603:Cytotoxins; D022361:Escherichia coli Vaccines; D021122:Protein Subunits; D022621:Shiga Toxin; D012697:Serine Endopeptidases