Cloning, sequence determination, and expression of a 32-kilodalton-protein gene of Mycobacterium tuberculosis.

Infection and Immunity
M BorremansJ Content

Abstract

We describe the identification of the gene encoding an immunodominant 32-kilodalton (kDa) protein of Mycobacterium tuberculosis. The 32-kDa antigen is abundantly secreted into the culture supernatant of a variety of mycobacteria and appears to be a major stimulant of cellular and humoral immunity against mycobacteria. Recombinant clones expressing a 140- or 125-kDa beta-galactosidase fusion protein reactive with rabbit polyclonal anti-32 kDa protein serum were detected. The corresponding DNA sequence contains a 1,008-base-pair coding region. The deduced amino acid sequence corresponds to a 336-residue protein including the previously determined NH2-terminal sequence of the 32-kDa protein (J. De Bruyn, K. Huygen, R. Bosmans, M. Fauville, R. Lippens, J. P. Van Vooren, P. Falmagne, M. Weckx, H. G. Wiker, M. Harboe, and M. Turneer, Microb. Pathog. 2:351-366, 1987). Upstream of this NH2-terminal region, the gene codes for a signal peptide required for the secretion of a 294-amino-acid-long mature protein. A putative promoter sequence could be located upstream of the open reading frame. Comparison of the M. tuberculosis 32-kDa antigen with the Mycobacterium bovis BCG alpha-antigen (K. Matsuo, R. Yamaguchi, A. Yamazaki, H. Tasaka, and...Continue Reading

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