Abstract
Numerous desulfurizing bacteria from the Rhodococcus genus harbor conserved dsz genes responsible for the degradation of sulfur compounds through 4S pathway. This study describes a newly identified desulfurizing bacterium, Rhodococcus sp. FUM94, which unlike previously identified strains encodes a truncated dsz operon. DNA sequencing revealed a frameshift mutation in the dszA gene, which led to an alteration of 66 amino acids and deletion of other C-terminal 66 amino acids. The resulting DszA polypeptide was shorter than DszA in Rhodococcus sp. IGTS8 reference strain. Despite the truncation, desulfurizing activity of the operon was observed and attributed to the removal of an overlap of dszA and dszB genes, and lack of active site in the altered region. Desulfurization experiments resulted in specific production rate of 6.3 mmol 2-hydroxy biphenyl (kgDCW)−1 h−1 at 2 g l−1 biocatalyst concentration and 68.8% biodesulfurization yield at 20 g l−1 biocatalyst concentration, both at 271 μM dibenzothiophene concentration which is comparable to similar wild-type biocatalysts.
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25 January 2018
The original version of this article unfortunately contained a mistake in the caption of Figs. 5 and 6.
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Acknowledgements
Some experiments were performed in the Biotechnology Laboratory of the Faculty of Veterinary Medicine, and in the Genetic Engineering Laboratory of the Research Institute of Biotechnology, Ferdowsi University of Mashhad.
Funding
This work was supported by the Ferdowsi University of Mashhad, Graduate Students Research Fund, Grant No. 3/22025. The sponsor had no involvement in the study design; collection, analysis, and interpretation of the data; writing the report; and decision for submission.
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The authors declare no personal or financial conflict of interest. All authors approved the final version of the manuscript. SK conducted the experiments, MAM designed and supervised the study, RG contributed the experimental setup, and HD supervised some experiments and contributed to the interpretation of results.
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A correction to this article is available online at https://doi.org/10.1007/s12010-018-2703-9.
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Khosravinia, S., Mahdavi, M.A., Gheshlaghi, R. et al. Characterization of Truncated dsz Operon Responsible for Dibenzothiophene Biodesulfurization in Rhodococcus sp. FUM94. Appl Biochem Biotechnol 184, 885–896 (2018). https://doi.org/10.1007/s12010-017-2596-z
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DOI: https://doi.org/10.1007/s12010-017-2596-z