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Expression of Shiga toxin epitopes in E. coli immunological characterization
J McEwen1, M Leitner, I Harari
1Department of Chemical Immunology, Weizmann Institute of Science, Rehovot, Israel.
Immunology Letters
|May 1, 1989
Summary
Synthetic DNA created peptides from Shiga toxin B subunit. Bacterial expression and rabbit immunization produced antibodies that target Shiga toxin, indicating potential for vaccine development.
Area of Science:
- Molecular Biology
- Immunology
- Bacteriology
Background:
- The N-terminal region of Shiga toxin B subunit contains key epitopes.
- These epitopes can induce neutralizing antibodies against the toxin.
Purpose of the Study:
- To express Shiga toxin B subunit peptides in bacteria.
- To evaluate the immunogenicity of these bacterial peptide fusions.
- To determine if antibodies generated cross-react with intact Shiga toxin.
Main Methods:
- Synthetic oligodeoxynucleotides encoding Shiga toxin B subunit peptides (residues 9-21 and 19-31) were synthesized.
- Peptides were expressed as fusion proteins with beta-galactosidase in E. coli using the pTOZ plasmid.
- Bacterial extracts containing fusion proteins were used to immunize rabbits.
Main Results:
- Recombinant E. coli successfully expressed Shiga toxin B subunit peptides as beta-galactosidase fusion proteins.
- Immunization of rabbits with bacterial extracts elicited a specific humoral immune response against the peptides.
- Generated antibodies demonstrated cross-reactivity with the intact Shiga toxin.
Conclusions:
- Bacterial expression systems can produce immunogenic Shiga toxin B subunit peptides.
- The induced antibodies show specificity for the target peptides and cross-reactivity with the native toxin.
- This approach holds promise for developing Shiga toxin vaccines or diagnostic tools.