Abstract
A component of Mycobacterium bovis BCG referred to as BCG-a was isolated through the combined use of monoclonal antibody directed to BCG and affinity chromatography. Analysis of BCG-a by sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed a single prominent band with a molecular weight of ca. 10,000. Structural characterization of BCG-a consisting of amino acid composition and amino-terminal sequence determination was carried out. The intact BCG-a antigen was bound by neither the lectin from common lentils nor concanavalin A, implying that BCG-a does not carry any asparagine-linked oligosaccharides. Immunoprecipitation of 125I-labeled BCG-a with polyclonal and monoclonal antibodies directed against BCG resulted in bands having the same mobility on sodium dodecyl sulfate-polyacrylamide gel electrophoresis as did free 125I-BCG-a. In radioimmunoassays 125I-BCG-a was bound by the monoclonal antibody and by polyclonal antibodies from rabbits that had been immunized to BCG and to Mycobacterium tuberculosis H37Rv. Antibodies to nontuberculous and to nonacid-fast bacteria bound BCG-a poorly or not at all. The binding of 125I-BCG-a by the monoclonal antibody was readily inhibited by extracts of BCG and H37Rv, but it was not as readily inhibited by extracts of nontuberculous mycobacteria and was not at all inhibited by extracts of nonacid-fast bacteria. Considerable inhibition was similarly observed by surface antigens of nonviable, intact BCG organisms. Delayed cutaneous hypersensitivity reactions to small concentrations of BCG-a were elicited in guinea pigs that had been immunized with BCG or H37Rv antigens, but such reactions were not elicited in unimmunized animals.
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