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. 1988 May;56(5):1281–1287. doi: 10.1128/iai.56.5.1281-1287.1988

Generation and characterization of monoclonal antibodies to 28-, 35-, and 65-kilodalton proteins of Mycobacterium tuberculosis.

G Damiani 1, A Biano 1, A Beltrame 1, D Vismara 1, M F Mezzopreti 1, V Colizzi 1, D B Young 1, B R Bloom 1
PMCID: PMC259809  PMID: 2451641

Abstract

Three monoclonal antibodies (H60.15, H61.3, and H105.10) directed to protein antigens of Mycobacterium tuberculosis were obtained and characterized. H60.15 recognizes a protein with a molecular mass of 28 kilodaltons (kDa) with broad cross-reactivity on a panel of 12 species and strains of mycobacteria. H61.3 reacts with a 35-kDa protein present in M. tuberculosis, Mycobacterium bovis BCG, and M. africanum. On the basis of the antigen molecular masses and competition experiments with other monoclonal antibodies, H60.15 and H61.3 seem to be the first described monoclonal antibodies to these M. tuberculosis proteins. H105.10 binds to the cross-reactive 65-kDa protein present in mycobacteria. Epitope mapping of H105.10 was performed by using the M. leprae DNA sublibrary available in bacteriophage lambda gt11 for this antigen and revealed that its epitope resides in the region from amino acids 20 to 54. The 28-, 35-, and 65-kDa antigens isolated by immunoblotting and presented on nitrocellulose to pleural effusion T cells from tuberculosis patients induced a proliferative response, indicating the presence of T-cell epitopes. These observations indicate that two protein antigens should be added to the list of antigens detectable in M. tuberculosis by monoclonal antibodies. The common feature of such proteins, the elicitation of an immune response of limited or broad cross-reactivity for mycobacteria, encourages the search for their role in the pathogenesis of mycobacterioses.

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Selected References

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