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Biotransformation of Indole and Its Derivatives by a Newly Isolated Enterobacter sp. M9Z

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Abstract

In this study, a novel bacterial strain M9Z with the ability of producing indigoids from indole and its derivatives was isolated from activated sludge and identified as Enterobacter sp. according to 16S ribosomal RNA (rRNA) sequence analysis. UV-vis spectrometry and high-performance liquid chromatography-mass spectrometry analysis indicated that the products produced from indole, 5-methylindole, 7-methylindole, and 5-methoxyindole were indigo with different substituent groups, and the possible biotransformation pathways of indole derivatives, i.e., indole(s)-cis-indole-2,3-dihydrodiol(s)-indoxyl(s)-indigoids, were proposed. The conditions of indole transformation and indigo biosynthesis by strain M9Z were optimized, and the maximal indigo yield (68.1 mg/L) was obtained when using 150 mg/L indole, 200 mg/L naphthalene, and 5 g/L yeast extract. The transformation rates of 5-methylindole, 7-methylindole, and 5-methoxyindole by strain M9Z were all close to 100 % under certain conditions, making strain M9Z an efficient indigoid producer. This is the first study of indole biotransformation and indigoid biosynthesis by genus Enterobacter.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 21176040), the Program for New Century Excellent Talents in University (No. NCET-13-0077), and the Fundamental Research Funds for the Central Universities (No. DUT14YQ107).

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Authors and Affiliations

  1. Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China

    Yuanyuan Qu, Zhaojing Zhang, Qiao Ma, E Shen, Wenli Shen, Jingwei Wang, Longchao Cong, Duanxing Li, Ziyan Liu, Huijie Li & Jiti Zhou

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  1. Yuanyuan Qu
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  2. Zhaojing Zhang
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  3. Qiao Ma
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Correspondence to Yuanyuan Qu.

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Qu, Y., Zhang, Z., Ma, Q. et al. Biotransformation of Indole and Its Derivatives by a Newly Isolated Enterobacter sp. M9Z. Appl Biochem Biotechnol 175, 3468–3478 (2015). https://doi.org/10.1007/s12010-015-1518-1

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  • DOI: https://doi.org/10.1007/s12010-015-1518-1

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