Abstract
Arthrobacter protophormiae RKJ100 was previously characterized for its ability to tolerate extremely high concentrations of o-nitrobenzoate (ONB), a toxic xenobiotic environmental pollutant. The physiological responses of strain RKJ100 to ≥30 mM ONB indicated towards a resistance mechanism manifested via alteration of cell morphology and cell wall structure. In this study, we aim to characterize gene(s) involved in the resistance of strain RKJ100 towards extreme concentrations (i.e. 150 mM) of ONB. Transposon mutagenesis was carried out to generate a mutant library of strain RKJ100, which was then screened for ONB-sensitive mutants. A sensitive mutant was defined and selected as one that could not tolerate ≥30 mM ONB. Molecular and biochemical characterization of this mutant showed that the disruption of endo-β-N-acetylglucosaminidase (ENGase) gene caused the sensitivity. ENGase is an important enzyme for oligosaccharide processing and cell wall recycling in bacteria, fungi, plants and animals. Previous reports have already indicated several possible roles of this enzyme in cellular homeostasis. Results presented here provide the first evidence for its involvement in bacterial resistance towards extreme concentrations of a toxic xenobiotic compound and also suggest that strain RKJ100 employs ENGase as an important component in osmotic shock response for resisting extreme concentrations of ONB.
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Acknowledgments
This study was partly supported by Council for Scientific and Industrial Research (CSIR) India and Department of Biotechnology (DBT) India. JP and FK acknowledge the research fellowships awarded by CSIR. We are thankful to John Oakeshott and Rinku Pandey for critically reading the manuscript. All other authors also wish to acknowledge the inspiration of RKJ, who fell ill during the course of this study and passed before the manuscript was ready for communication.
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Communicated by A. Driessen.
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Pandey, J., Khan, F., Mahajan, V. et al. Evidence for vital role of endo-β-N-acetylglucosaminidase in the resistance of Arthrobacter protophormiae RKJ100 towards elevated concentrations of o-nitrobenzoate. Extremophiles 18, 491–500 (2014). https://doi.org/10.1007/s00792-014-0632-2
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DOI: https://doi.org/10.1007/s00792-014-0632-2