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Characterization and purification of esterase from Cellulomonas fimi DB19 isolated from Zanthoxylum armatum with its possible role in diesel biodegradation

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Abstract

Endophytic bacteria inhabit all or part of their life cycle within the tissues of healthy plants, without causing any apparent symptoms of disease. They are treasure trove of several hydrolytic enzymes with distinct characteristics. Esterase is one of such enzymes and this study aims to characterize esterase produced by endophytic actinobacteria Cellulomonas fimi DB19 isolated from Zanthoxylum armatum with its capacity to degrade diesel oil. The enzyme was purified with purification fold 8.22 and specific activity 124.72 U/mg with 16.43% recovery. The purified enzyme showed a single protein band on SDS-PAGE having molecular mass of approximately 39 kDa. The Km and Vmax value for p-nitrophenyl acetate were 2.23 mM and 22.04 U/mL, respectively. The enzyme was stable in the pH range 6–9 with its optimal activity at pH 8.0. The enzyme was stable at 40 °C and retained more than 80% activity after incubation for two h. The enzyme activity was positively influenced in the presence of Na+, Ba2+, Ca2+, and negatively by Mn2+, and Mg2+. The EDTA and PMSF inhibited the enzyme activity and retained its activity in the presence of SDS, H2O2, β-mercaptoethanol, and organic solvents. Application of the isolate in degradation of diesel showed that its growth and degradation capacity enhanced in media supplemented with 0.2–4% of diesel oil with maximum at 3% of diesel oil. Furthermore, esterase activity was greater in media containing diesel than control which is suggesting the plausible role of esterase produced by Cellulomonas fimi DB19 in the degradation of diesel oil.

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Acknowledgements

The authors are highly thankful to the State Biotech Hub (SBTHub), North-Eastern Hill University, Shillong for providing the required instrumentation facilities. DB is also thankful to the Department of Science and Technology, Government of India for providing financial assistance in the form of fellowship (INSPIRE Fellow).

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The authors have no relevant financial or non-financial interests to disclose.

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Both the authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by DB. The first draft of the manuscript was written by DB, and manuscript was reviewed and edited by both the authors. All authors read and approved the final manuscript.

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Correspondence to Dina Barman.

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Communicated by Erko Stackebrandt.

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Barman, D., Dkhar, M.S. Characterization and purification of esterase from Cellulomonas fimi DB19 isolated from Zanthoxylum armatum with its possible role in diesel biodegradation. Arch Microbiol 204, 580 (2022). https://doi.org/10.1007/s00203-022-03210-3

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  • DOI: https://doi.org/10.1007/s00203-022-03210-3

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