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Kinetic characterization of purified laccase from Trametes hirsuta: a study on laccase catalyzed biotransformation of 1,4-dioxane

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Abstract

Objective

Laccase is one of the best known biocatalysts which degrade wide varieties of complex molecules that are both non-cyclic and cyclic in structure. The study focused on enzyme kinetics of a purified laccase from Trametes hirsuta L. fungus and its application on biotransformation of a carcinogenic molecule 1,4-dioxane.

Results

Laccase was purified from white-rot fungus T. hirsuta L. which showed specific activity of 978.34 U/mg after the purification fold of 54.08. The stable laccase activity (up to 16 h) is shown at 4–6 pH and 20–40 °C temperature range. The purified enzyme exhibited significant stability for 10 metal ions up to 10 mM concentration, except for Fe2+ and Hg2+. The Cu2+ ion induced laccase activity up to 142% higher than the control at 10 mM concentration. The laccase enzyme kinetic parameters Km was 20 ± 5 µM and 400 ± 60 µM, whereas Kcat was 198.29 ± 0.18/s and 80.20 ± 1.59/s for 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) and guaiacol respectively. The cyclic ether 1,4-dioxane (100 ppm) was completely degraded in presence of purified laccase within 2 h of incubation and it was confirmed by HPLC and GC analysis. The oxidation reaction was accelerated by 25, 22, 6 and 19% in presence of 1 mM syringaldehyde, vanillin, ABTS and guaiacol mediators respectively.

Conclusions

In this study, fungal laccase (a natural biocatalyst) based degradation of synthetic chemical 1,4-dioxane was reported for the first time. This method has added advantages over the multiple methods reported earlier being a natural remedy.

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Acknowledgements

This work was supported by BRNS, DAE, Govt. of India, Project No. 34(1)/14/01/2014. Authors thank Vision Group on Science and Technology, Govt. of Karnataka, India and Admar Mutt Education Foundation (AMEF), Udupi, India for the infrastructure facility. KKN would like to thank Mr.Nagendra Kulal and his guide Dr. Ganapati V Shanbhag from Materials Science division of PPISR  for helping in GC analysis.

Funding

Funding was supported by Board of Research in Nuclear Sciences [Grant No. 34(1)/14/01/2014].

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Correspondence to Ananda Kulal.

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The authors declare that they have no conflicts of interest.

Supplementary information

Supplementary Fig. 1—Kinetics of laccase inhibition represented through Lineweaver-Burke plot and secondary plot for Ki determination. (a) LB plot depicting laccase inhibition by NaN3, (b) Secondary plot for laccase inhibition by NaN3 and (c) LB plot depicting laccase inhibition by EDTA and (d) Secondary plot for laccase inhibition by EDTA.

Supplementary Fig. 2—HPLC chromatograms for laccase mediated 1,4-dioxane degradation. Degradation of 1,4-dioxane run in a RP C18 column using 95% acetonitrile as mobile phase and chromatogram represented (a) before degradation, peaks at RT 3.43, 4.12 min-un-identified peaks and at RT 5.53 min represented for 1,4-dioxane (b) after 2 h of laccase mediated degradation, peak at RT 3.35 min-un-identified peak.

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Navada, K.K., Kulal, A. Kinetic characterization of purified laccase from Trametes hirsuta: a study on laccase catalyzed biotransformation of 1,4-dioxane. Biotechnol Lett 43, 613–626 (2021). https://doi.org/10.1007/s10529-020-03038-1

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  • DOI: https://doi.org/10.1007/s10529-020-03038-1

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