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. 1998 Mar;93(3):314–322. doi: 10.1046/j.1365-2567.1998.00449.x

Recognition of a common mycobacterial T-cell epitope in MPB59 of Mycobacterium bovis.

K A Lightbody 1, R M Girvin 1, D A Pollock 1, D P Mackie 1, S D Neill 1, J M Pollock 1
PMCID: PMC1364078  PMID: 9640240

Abstract

Bovine tuberculosis, which persists as a residual level of infection in many European countries, has implications not only for the economy of farming communities but also for human health. The aim of this study was to identify a common mycobacterial antigen which was recognized in bovine tuberculosis and to characterize the response to this antigen at the epitope level. A T-cell clone, phenotype CD4+, raised from an animal experimentally infected with Mycobacterium bovis was shown to proliferate in response to a panel of sonicates derived from different mycobacterial species indicating recognition of an antigen with broad specificity. This antigen was subsequently shown to be MPB59. Recognition of MPB59 at the epitope level was determined in experimental and field cases of bovine tuberculosis using a panel of synthetic peptides (20-mers with 10-residue overlaps) incorporating the signal sequence and mature protein. The results showed that in vitro interferon-gamma was predominantly produced in response to adjacent peptides numbers 10 and 11, suggesting that the dominant epitope was contained in the overlap, correlating to residues 101-110 (YYQSGLSIVM). This epitope was recognized by 54% of tuberculous cattle of mixed breeds, which suggests that it may be genetically permissive in terms of major histocompatibility complex presentation. Sequence analysis confirmed that there were only minor differences in the amino acid composition within this region for various mycobacterial species, which could explain the common T-cell recognition described in this study. Common recognition of this epitope indicates that it would have limited potential for use as a diagnostic reagent per se but may have potential for inclusion in a subunit vaccine.

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Selected References

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