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Monoclonal antibodies directed to Mycobacterium bovis BCG (BCG) and to M. tuberculosis H37Rv (H37Rv) were used in conjunction with affinity chromatography to prepare a mycobacterial component which was designated BCG-a. A synthetic peptide antigen was prepared based on the amino acid sequence of BCG-a and was designated BCG-a-P. Significant immunological similarities were found between BCG-a-P and antigens in extracts of BCG and H37Rv but not between BCG-a-P and antigens of nontuberculous mycobacteria. An enzyme-linked immunosorbent assay detected antibodies to BCG-a-P in sera from rabbits that had been immunized with BCG and H37Rv sonicates. In Western blot analysis, antibodies to BCG-a-P reacted to 10,000-molecular-weight components of extracts of BCG and H37Rv. Delayed cutaneous hypersensitivity reactions to BCG-a-P were elicited in guinea pigs immunized with sonicates of BCG and H37Rv but were weak or nonexistent in unimmunized animals or in animals immunized with sonicates of nontuberculous mycobacteria. This study points out the feasibility of using monoclonal antibodies to prepare and characterize synthetic mycobacterial peptides with a potential for immunodiagnostic purposes.

A chemically synthesized peptide which elicits humoral and cellular immune responses to mycobacterial antigens