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. 1993 Jul;79(3):368–374.

Cross-reactive idiotopes among anti-foot and mouth disease virus neutralizing antibodies.

M V Borca 1, A E Garmendia 1, B Baxt 1, D M Moore 1, S Srikumaran 1, D O Morgan 1
PMCID: PMC1421969  PMID: 8406565

Abstract

Foot and mouth disease virus (FMDV) viral protein 1 is the only one of the four viral proteins (VP) that induces neutralizing antibodies as an isolated protein. A 32 amino acid (AA) residue (32dimer) of FMDV subtype A12 Lp ab VP1 (AA 137-168) was immunogenic against the A12 subtype. Three antibody populations each recognizing different epitopes on 32dimer were isolated by affinity chromatography (AFC) from the serum of a steer which had been immunized with the 32dimer. The 32dimer contains an AA sequence that is recognized by a protective paratope carried on a murine monoclonal antibody (mAb) (7SF-3.H3.1). Polyclonal anti-7SF-3 idiotype antibodies specifically inhibited the binding activity of one of these anti-32dimer antibody populations suggesting the existence of cross-reactive paratopic-related idiotopes between mAb 7SF-3 and antibodies elicited by the 32dimer. These anti-idiotypic antibodies were used in AFC to purify antibodies from the anti-32dimer serum. The purified antibody population has characteristics that resemble those of the mAb 7SF-3, i.e. its reactivity with FMDV A subtypes in ELISA, radioimmunoassay (RIA), mouse neutralization and its lack of reactivity with a mAb 7SF-3 neutralizing escape virus variant. Furthermore, these antibodies were specifically inhibited by either anti-mAb 7SF-3 idiotypic antibodies or peptides containing the mAb 7SF-3 epitope. Using the same experimental approach, mAb 7SF-3 idiotope-bearing antibodies were shown to be present in serum from bovine and swine convalescent from FMDV A12 Lp ab infection. Thus, the highly immunogenic area between residues 137 and 168 of FMDV VP1 elicited a cross-reactive neutralizing idiotope response conserved amongst several animal species.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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