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Cloning and expressing DBT (dibenzothiophene) monooxygenase gene (dszC) from Rhodococcus sp. DS-3 in Escherichia coli

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Frontiers of Biology in China

Abstract

Dibenzothiophene (DBT) monooxygenase (DszC) catalysis, the first and also the key step in the microbial DBT desulfurization, is the conversion of DBT to DBT sulfone (DBTO2). In this study, dszC of a DBT-desulfurizing bacterium Rhodococcus sp. DS-3 was cloned by PCR. The sequence cloned was 99% homologous to Rhodococcus erythropolis IGTS8 that was reported in the Genebank. The gene dszC could be overexpressed effectively after being inserted into plasmid pET28a and transformed into E. coli BL21 strain. The expression amount of DszC was about 20% of total supernatant at low temperature. The soluble DszC in the supernatant was purified by Ni2+ chelating His-Tag resin column and sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) to electronics purity. Only one band was detected by Western-blotting, which is for the antibody released in mouse against purified DszC in the expression product of BL21 (DE3, paC5) and Rhodococcus sp. DS-3. The activity of purified DszC was 0.36 U. DszC can utilize the organic compound such as DBT and methyl-DBT, but not DBT derivates such as DBF, which has no sulfur or inorganic sulfur.

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Authors and Affiliations

  1. College of Life Sciences, Nankai University, Tianjin, 300071, China

    Ma Ting, Li Shanshan, Li Guoqiang, Wang Renjing, Liang Fenglai & Liu Rulin

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  1. Ma Ting
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  2. Li Shanshan
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  3. Li Guoqiang
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  4. Wang Renjing
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  5. Liang Fenglai
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  6. Liu Rulin
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Correspondence to Liu Rulin.

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Translated from Acta Scientiarum Naturalium Universitatis Nankaiensis, 2005, 38(6): 1–6 [译自: 南开大学学报 (自然科学版), 2005, 38(6): 1–6]

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Ma, T., Li, S., Li, G. et al. Cloning and expressing DBT (dibenzothiophene) monooxygenase gene (dszC) from Rhodococcus sp. DS-3 in Escherichia coli . Front. Biol. China 1, 375–380 (2006). https://doi.org/10.1007/s11515-006-0049-0

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