Abstract
In the present study, a bacterium-producing a laccase capable of decolorizing a dye was isolated from Bengaluru soil and identified as Bacillus marisflavi strain BB4 using by 16S rDNA sequencing. The optimum production was seen at 30 °C, pH 7.0 and 48 h when the culture flasks were shaken at 100 rpm with 1% inoculum level. A remarkable overall 5.2-fold increase in laccase production was attained after optimization. After (NH4)2SO4 precipitation and ion exchange technique, the calculated specific activity was 398.2 U/mg. The properties for the purified laccase were 52 kDa, 30 °C, pH 7.0, stimulated by Cu2+, strongly inhibited by Hg2+, no effect with Mg2+, Zn2+, Co2+, Na+, Fe2+, Mn2+, EDTA, inhibited by SDS, NaN3, L-Cys, 2-mercaptoethanol (2-ME), and dithiothreitol, oxidize guaiacol, 2,2′-azino-bis(3-ethylbenzothazoline-6-sulfonate (ABTS), catechol, and 2,6-dimethoxyphenol (2,6-DMP), has 1.43 µM and 227.3 U/ml as Km and Vmax, respectively. The laccase of B. marisflavi was able to decolorize Congo red, bromophenol blue, crystal violet, and indigo carmine without a redox mediator. However, the ABTS was needed as redox mediator to degrade malachite green and reactive orange 16 to a great extent. The laccase of the present study is therefore a good candidate for textile industries as decolorization agent.
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All the authors would like to thank the Management of Dayananda Sagar University for all the necessary facilities. All authors declare that no financial/commercial conflicts of interest
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Significance Statement
Although synthetic dyes are mostly utilized in industries, they cause pollution and may act as carcinogenic agents. Use of biodegradable macromolecules like laccases is needed nowadays. The search for laccase with desirable properties is a continuous task since the existing ones are produced at high cost and not principally commercialized. Here, laccase of Bacillus marisflavi was characterized as decolorization agent.
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Sharma, A., Muthupriya, M., Raj, R. et al. Properties of Laccase of Bacillus marisflavi Strain BB4 and its Synthetic Dyes Decolorization Analysis. Proc. Natl. Acad. Sci., India, Sect. B Biol. Sci. 91, 477–485 (2021). https://doi.org/10.1007/s40011-021-01235-0
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DOI: https://doi.org/10.1007/s40011-021-01235-0