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- W2100075421 abstract "Mycothiol (MSH) is the major cellular thiol in Mycobacterium tuberculosis (M.tb). We hypothesize that the mycothiol-dependent detoxification pathway may serve an important role during oxygen stress management in M. tuberculosis, derived from normal aerobic metabolism, the macrophage environment and through the action of anti-tubercular antibiotics, such as Isoniazid (INH). Total mRNA and DNA were isolated from M. bovis BCG at different stages of growth in 7H9 mycobacterial medium. Three genes involved in mycothiol metabolism and encoding the enzymes mycothiol S-conjugate amidase (Mca, Rv1082), NADPH dependent mycothiol reductase (mtr, Rv2855), and N-Acetyl-1-D-myo-Inosityl-2-Amino-2-Deoxy-alpha-D-Glucopyranoside Deacetylase (GlcNAc-Ins deacetylase, Rv1170 or mshB) were investigated for genomic rearrangements and expression. The results show that the genomic domains of the genes remain conserved in evolutionary diverse and unrelated M. tuberculosis isolates. The genes encoding enzymes implicated in mycothiol reduction, mtr (Rv2855) and the mycothiol-dependant detoxification of electrophilic agents, Mca (Rv1082), are shown to be actively transcribed during logarithmic M. bovis BCG growth. The gene encoding GlcNAc-Ins deacetylase (the rate limiting mycothiol biosynthesis step) shows induction in the presence of INH. Antisense oligonucleotides to both GlcNAc-Ins deacetylase (Rv1170) and mtr (Rv2855) mRNA affect mycobacterial growth. In conclusion the results presented here suggest that these enzymes are sensitive to free radical generating antituberculosis drugs and may be useful targets for new drug development." @default.
- W2100075421 created "2016-06-24" @default.
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- W2100075421 date "2004-03-01" @default.
- W2100075421 modified "2023-09-23" @default.
- W2100075421 title "Differential Expression of Mycothiol Pathway Genes: Are they Affected by Antituberculosis Drugs?" @default.
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- W2100075421 doi "https://doi.org/10.1080/15216540410001674012" @default.
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