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. 1993 Jul;175(13):4255–4259. doi: 10.1128/jb.175.13.4255-4259.1993

Characterization of the katG gene encoding a catalase-peroxidase required for the isoniazid susceptibility of Mycobacterium tuberculosis.

B Heym 1, Y Zhang 1, S Poulet 1, D Young 1, S T Cole 1
PMCID: PMC204858  PMID: 8320241

Abstract

The isoniazid susceptibility of Mycobacterium tuberculosis is mediated by the product of the katG gene which encodes the heme-containing enzyme catalase-peroxidase. In this study, the chromosomal location of katG has been established and its nucleotide sequence has been determined so that the primary structure of catalase-peroxidase could be predicted. The M. tuberculosis enzyme is an 80,000-dalton protein containing several motifs characteristic of peroxidases and shows strong similarity to other bacterial catalase-peroxidases. Expression of the katG gene in M. tuberculosis, M. smegmatis, and Escherichia coli was demonstrated by Western blotting (immunoblotting). Homologous genes were detected in other mycobacteria, even those which are naturally insensitive to isoniazid.

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Selected References

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