Antigenic properties of peptidic mimics for epitopes of the lipopolysaccharide from Brucella

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X De Bolle1, T Laurent, A Tibor

  • 1Immunology and Microbiology Laboratory, Research Unit in Molecular Biology (URBM), University of Namur (FUNDP), 61 rue de Bruxelles, Namur, B5000, Belgium. xavier.debolle@fundp.ac.be

Journal of Molecular Biology
|November 11, 1999
PubMed

Insights

Researchers identified peptides that mimic Brucella lipopolysaccharide (LPS) epitopes using phage display. These mimotopes could aid in developing diagnostics or vaccines for brucellosis and Malta fever.

Area of Science:

  • Immunology
  • Microbiology
  • Bacteriology

Background:

  • Lipopolysaccharide (LPS) is the primary virulence factor identified in Brucella, a bacterium causing brucellosis in animals and Malta fever in humans.
  • Monoclonal antibodies (mAbs) targeting distinct LPS epitopes have been developed and characterized.

Purpose of the Study:

  • To identify peptide mimotopes of Brucella LPS epitopes using phage display technology.
  • To investigate the binding characteristics of selected peptides to anti-LPS monoclonal antibodies.

Main Methods:

  • Phage display libraries were screened using two specific anti-LPS monoclonal antibodies (mAbs), A15-6B3 and B66-2C8.
  • Selected peptides were analyzed for amino acid composition, and their binding was assessed through competition assays with LPS.
  • Mice were immunized with selected phages to evaluate the immunogenicity of the peptide mimotopes.

Main Results:

  • Peptide selection revealed an overrepresentation of proline residues with A15-6B3 mAb and tryptophan residues with B66-2C8 mAb.
  • Competition assays demonstrated that the selected peptides bind to the antibody's paratope, indicating mimicry of LPS epitopes.
  • Immunization of mice with selected phages elicited a weak antibody response against Brucella LPS.

Conclusions:

  • A subset of peptides selected via phage display function as mimotopes of Brucella LPS epitopes.
  • These mimotopes hold potential for further research in diagnostics and vaccine development for Brucella infections.

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