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Random UV Mutagenesis Approach for Enhanced Biodegradation of Sulfonated Azo Dye, Green HE4B

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Abstract

The objective of the study was to execute mutant bacteria for efficient biodegradation of sulfonated azo dye, Green HE4B (GHE4B). UV irradiation was used to introduce random mutations in Pseudomonas sp. LBC1. Genetic alterations induced by UV irradiation in selected mutant bacteria were confirmed by random amplification of polymorphic DNA technique. The mutant bacteria named as Pseudomonas sp. 1 F reduced the time required for complete degradation of recalcitrant dye GHE4B by 25 % when compared with the wild one. The biodegradation was monitored by UV–Vis spectrophotometric analysis. Activities of enzymes like laccase, lignin peroxidase, veratryl alcohol oxidase, and NADH dichlorophenol indophenol reductase were found to be boosted in mutant bacteria as a consequence of UV-induced mutation. Matrix-assisted laser desorption/ionization-time of flight analysis of differentially expressed proteins of mutant bacteria suggested active role of antioxidant enzymes in the degradation of the dye. The degradation product was analyzed by Fourier transform infrared spectroscopy, high-performance thin-layer chromatography, and gas chromatography–mass spectrometry. Results revealed few variations in the degradation end products of wild-type and mutant bacteria. Phytotoxicity study underlined the safer biodegradation of GHE4B by mutant Pseudomonas sp. 1 F.

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Acknowledgments

Ms. Swati M. Joshi wishes to thank the Department of Biotechnology, New Delhi, for senior research fellowship. Mr S. A. Inamdar is thankful to UGC New Delhi for BSR meritorious fellowship.

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Authors and Affiliations

  1. Department of Biotechnology, Shivaji University, Kolhapur, India

    Swati M. Joshi, Shrirang A. Inamdar & Jyoti P. Jadhav

  2. Department of Biochemistry, Shivaji University, Kolhapur, 416004, India

    Sanjay P. Govindwar

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  1. Swati M. Joshi
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  2. Shrirang A. Inamdar
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  3. Jyoti P. Jadhav
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  4. Sanjay P. Govindwar
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Correspondence to Sanjay P. Govindwar.

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Joshi, S.M., Inamdar, S.A., Jadhav, J.P. et al. Random UV Mutagenesis Approach for Enhanced Biodegradation of Sulfonated Azo Dye, Green HE4B. Appl Biochem Biotechnol 169, 1467–1481 (2013). https://doi.org/10.1007/s12010-012-0062-5

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  • DOI: https://doi.org/10.1007/s12010-012-0062-5

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