title: The catalase-peroxidase of Mycobacterium intracellulare: nucleotide sequence analysis and expression in Escherichia coli.
abstract: The activation of catalase genes in response to oxidative stress may contribute to the intracellular survival of mycobacteria. In this report, the nucleotide sequence of a mycobacterial catalase gene is described. The deduced protein sequence of this Mycobacterium intracellulare gene (MI85) was 60% identical to the Escherichia coli hydroperoxidase I (HPI) protein, 59% identical to the Salmonella typhimurium (HPI) catalase, and 47% identical to a Bacillus stearothermophilus peroxidase. The MI85 protein, expressed in E. coli, has also been shown to have peroxidase and catalase activities. Furthermore, Southern blot hybridizations, which demonstrated that a MI85 gene probe hybridizes with chromosomal DNA from thirteen different strains of mycobacteria, suggest that this catalase-peroxidase gene is prevalent in the mycobacterial genus. The availability of catalase gene probes should permit an evaluation, at the molecular level, of the role of catalase in mycobacterial pathogenesis.
authors.affiliation: Laboratory of Mycobacteria, Food and Drug Administration, Bethesda, Maryland 20892.
authors.forename: S L
authors.initials: SL
authors.lastname: Morris
authors.forename: J
authors.initials: J
authors.lastname: Nair
authors.forename: D A
authors.initials: DA
authors.lastname: Rouse
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D015139:Blotting, Southern; D002374:Catalase / Q000235:genetics*; D015342:DNA Probes; D004269:DNA, Bacterial / Q000235:genetics / Q000378:metabolism; D015246:Deoxyribonuclease EcoRI / Q000378:metabolism; D005798:Genes, Bacterial / Q000235:genetics*; D008969:Molecular Sequence Data; D015269:Mycobacterium avium Complex / Q000201:enzymology* / Q000235:genetics*; D009195:Peroxidase / Q000235:genetics*; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics; D017386:Sequence Homology, Amino Acid
chemical_list: D015342:DNA Probes; D004269:DNA, Bacterial; D011994:Recombinant Proteins; D002374:Catalase; D009195:Peroxidase; D015246:Deoxyribonuclease EcoRI