Biotechnology Bulletin ›› 2021, Vol. 37 ›› Issue (8): 186-194.doi: 10.13560/j.cnki.biotech.bull.1985.2020-1408

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Isolation,Purification and Characterization of Laccase LacT-1 from Cerrena unicolor

TIAN Jia-hui1(), FENG Jia-li1, LU Jun-hua1, MAO Lin-jing1, HU Zhu-ran2, WANG Ying1(), CHU Jie1()   

  1. 1. Biology Institute,Qilu University of Technology(Shandong Academy of Sciences),Ji’nan 250103
    2. Shandong Bilan Biotechnology Co. Ltd.,Ningyang 271400
  • Received:2020-11-18 Online:2021-08-26 Published:2021-09-10
  • Contact: WANG Ying,CHU Jie E-mail:546037198@qq.com;302624346@qq.com;chujie6532@163.com

Abstract:

Laccase may react with many types of substrates and has a broad application prospect,but the laccase properties from different strains differ. In this study,the laccase in the fermentation supernatant of a newly isolated fungus Cerrena unicolor was separated and purified sequentially by(NH42SO4 precipitation,hydrophobic chromatography(phenyl sepharose),ion exchange chromatography(DEAE sepharose)and gel chromatography(TSK gel G2000SWxl),and named as LacT-1. The molecular weight of purified LacT-1 was approximately 65 kD with specific activity of 41.31 U/mg. The recovery rate was 6.57% after 21.86 times of purification. The optimal temperature of LacT-1 was 60℃ and the optimal pH was 4.8. The LacT-1 activity was relatively stable with the temperature at 0-30℃ or pH 5.4-8. TCA promoted laccase activity. The Michaelis constant Km of LacT-1 with ABTS as substrate was 0.075 mmol/L,while the corresponding Vmax was 250 000 mmol/(L·min). The degradation rates of methyl orange,acid red 1,reactive black 5,Coomassie brilliant blue R250,malachite green,crystal violet and bromophenol blue ranged in 71.64% to 95.17%. The above results indicate that the LacT-1 has practical application potential because of excellent pH stability,strong binding force with ABTS and it can effectively degrade some common dyes.

Key words: laccase, Cerrena unicolor, isolation and purification, enzymatic properties, degradation of dyes