Abstract
2,4,6-Trinitrotoluene (TNT) is the most widely used nitroaromatic compound and is highly resistant to degradation. Most aerobic microorganisms reduce TNT to amino derivatives via formation of nitroso- and hydroxylamine intermediates. Although pathways of TNT degradation are well studied, proteomic analysis of TNT-degrading bacteria was done only for some individual Gram-negative strains. Here, we isolated a Gram-positive strain from TNT-contaminated soil, identified it as Bacillus pumilus using 16S rRNA sequencing, analyzed its growth, the level of TNT transformation, ROS production, and revealed for the first time the bacillary proteome changes at toxic concentration of TNT. The transformation of TNT at all studied concentrations (20–200 mg/L) followed the path of nitro groups reduction with the formation of 4-amino-2,6-dinitrotoluene. Hydrogen peroxide production was detected during TNT transformation. Comparative proteomic analysis of B. pumilus showed that TNT (200 mg/L) inhibited expression of 46 and induced expression of 24 proteins. Among TNT upregulated proteins are those which are responsible for the reductive pathway of xenobiotic transformation, removal of oxidative stress, DNA repair, degradation of RNA and cellular proteins. The production of ribosomal proteins, some important metabolic proteins and proteins involved in cell division are downregulated by this xenobiotic.
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This work was carried out under the Program of Kazan Federal University Strategic Academic Leadership and supported by Russian Science Foundation Grant No 22-24-00036.
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Yakovleva, G., Kurdy, W., Gorbunova, A. et al. Bacillus pumilus proteome changes in response to 2,4,6-trinitrotoluene-induced stress. Biodegradation 33, 593–607 (2022). https://doi.org/10.1007/s10532-022-09997-8
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DOI: https://doi.org/10.1007/s10532-022-09997-8