Abstract
A panel of monoclonal antibodies were derived from BALB.B10 mice immunized with a culture filtrate from Mycobacterium tuberculosis H37Rv. Of these antibodies, 10 were examined more closely for antigen specificity and interspecies reactivity. Six antibodies were used as immunosorbents for affinity purification of their corresponding antigens. Two monoclonal antibodies (HBT 2 and HBT 11) reacted with a 17-kilodalton antigen, and a competition assay showed that these antibodies are directed against the same epitope or against epitopes that are sterically very close to each other. Monoclonal antibody HBT 12 reacted with the same molecule with which a previously described 38-kilodalton reactive antibody reacted but was directed against a different epitope. Antibody HBT 10 reacted with a culture filtrate of M. tuberculosis but not of Mycobacterium bovis BCG. This latter finding was further studied by testing different preparations of M. tuberculosis H37Rv antigens and, additionally, culture filtrates of four M. tuberculosis and two BCG strains. Interspecies reactivity was assayed by immunoblotting and revealed that the majority of the monoclonal antibodies were specific to M. tuberculosis complex.
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Selected References
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