Abstract
Laccases are widespread multi-copper oxidases and generally classified into three-domain laccases and two-domain laccases. In this study, a novel laccase PthLac from Parageobacillus thermoglucosidasius harbored only one domain of Cu-oxidase_4 and showed no sequence relatedness or structure similarity to three-domain and two-domain laccases. PthLac was heterologously expressed in Escherichia coli, purified, and characterized. The optimum temperature and pH of PthLac on guaiacol were at 60 ℃ and pH 6, respectively. The effects of various metal ions on PthLac were analyzed. All the tested metal ions did not suppress the activity of PthLac, except for 10 mM Cu2+, which increased the activity of PthLac to 316%, indicating that PthLac was activated by Cu2+. Meanwhile, PthLac kept 121% and 69% activity when incubated at concentrations of 2.5 and 3 M NaCl for 9 h, suggesting the long-term halotolerancy of this enzyme. In addition, PthLac showed resistance to the organic solvents and surfactants, and displayed dye decolorization capacity. This study enriched our knowledge about one-domain laccase and its potential industrial applications.
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Funding
This study was funded by the Key Scientific Projects for colleges of Henan Province (Grant number 21A180004), the Henan Provincial Science and Technology Research Project (Grant number 222102320250), and the Doctoral Scientific Research Start-up Foundation from Henan University of Technology (Grant number 2018BS080).
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XW, PC, HL, and JQ conceived and designed research. XW, PC, and ZL conducted experiments. XW analyzed data. XW and PC wrote the manuscript. All authors read and approved the manuscript.
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Wang, X., Chen, P., Li, H. et al. Characterization of a Novel One-Domain Halotolerant Laccase from Parageobacillus thermoglucosidasius and Its Application in Dye Decolorization. Appl Biochem Biotechnol 195, 6465–6477 (2023). https://doi.org/10.1007/s12010-023-04389-x
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DOI: https://doi.org/10.1007/s12010-023-04389-x