Abstract
In this study, an easily detectable method was employed for screening laccase-producing microorganisms by using 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) as laccase secretion indicator. A novel laccase-producing strain was isolated and identified as Shiraia bambusicola Henn. strain GZ11K2 according to the morphological characteristics and the comparison of internal transcribed spacer ribosomal DNA gene sequences. In further investigation, the production of laccase by S. bambusicola GZ11K2 was greatly enhanced by the nontoxic inducers of copper sulfate and rhodamine B. Copper and rhodamine B were added into the cultivation medium at 24 and 12 h, respectively, and the maximum laccase production was obtained. Under the induction of 2.0 mM copper sulfate and 35 μM rhodamine B, an increment of about 80 times of laccase activity compared with that in the inducer-free medium and about 20 times compared with that in the single copper-supplemented medium was observed. Compared with other species, S. bambusicola GZ11K2 exhibits better laccase-producing characteristics with an activity of 16,400 U/L after 108 h, suggesting its potential ability for industrial application.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (no. 30960004), Natural Science Foundation of Guizhou Province (2011-3094, 2010-4008, 2009-7012-1, 2011-204), and Natural Science Foundation of Guizhou University (2007-035, 2010-102).
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Du, W., Sun, C., Yu, J. et al. Effect of Synergistic Inducement on the Production of Laccase by a Novel Shiraia bambusicola Strain GZ11K2. Appl Biochem Biotechnol 168, 2376–2386 (2012). https://doi.org/10.1007/s12010-012-9943-x
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DOI: https://doi.org/10.1007/s12010-012-9943-x