食品科学 ›› 2010, Vol. 31 ›› Issue (5): 201-205.doi: 10.7506/spkx1002-6300-201005045

• 生物工程 • 上一篇    下一篇

韦伯灵芝漆酶的分离纯化及其性质

陈琼华1,周玉萍2,陈 晓1,柯德森1,程惠贞2,田长恩1 , 2 ,*   

  1. 1.广州大学生命科学学院 2.广州大学 植物抗逆基因功能研究广州市重点实验室
  • 收稿日期:2009-07-25 修回日期:2009-11-11 出版日期:2010-03-01 发布日期:2010-12-29
  • 通讯作者: 田长恩 E-mail:changentian@yahoo.com.cn
  • 基金资助:

    广东省自然科学基金项目(8151009101000013);广东省科技计划项目(2007B080701008);
    广州市高校科学技术研究项目(62031);广州大学植物抗逆基因功能研究广州市重点实验室开放基金项目(200801)

Purification and Characterization of Laccase from Ganoderma weberianum

CHEN Qiong-hua1,ZHOU Yu-ping2,CHEN Xiao1,KE De-sen1,CHENG Hui-zhen2,TIAN Chang-en1,2,*   

  1. 1. School of Life Sciences, Guangzhou University, Guangzhou 510006, China;2. Guangzhou Key Laboratory for Functional
    Studies on Plant Stress-Resistant Genes, Guangzhou University, Guangzhou 510006, China
  • Received:2009-07-25 Revised:2009-11-11 Online:2010-03-01 Published:2010-12-29
  • Contact: TIAN Chang-en1 E-mail:changentian@yahoo.com.cn

摘要:

采用硫酸铵分级盐析、透析、聚乙二醇浓缩和高效液相色谱柱层析从韦伯灵芝TZC-1 发酵液中分离纯化得到电泳纯漆酶,其纯化倍数为37.1 倍,酶活性回收率为21.3%。活性-PAGE(聚丙烯酰胺凝胶电泳)结果表明该漆酶由一种同工酶组成,纯化漆酶经SDS-PAGE 检测显示为单一条带,其分子质量约为40kD。该漆酶催化底物ABTS 的最适反应温度为50~60℃,最适反应pH 值为4.6,在60℃以下和pH3.0~5.0 范围内保持稳定,以ABTS为底物的表观Km 值为13.8μmol/L。Fe2+ 完全抑制酶活,Al3+ 和Mn2+ 对该漆酶也有明显抑制作用,Hg+、Cu2+ 和Mg2+ 对该酶有明显激活作用,而Zn2+、Ba2+ 及K+ 对该酶活性影响不大。

关键词: 韦伯灵芝, 漆酶, 纯化, 酶活

Abstract:

The laccase from Ganoderma weberianum TZC-1 was purified using fractional ammonium sulfate precipitation, dialysis, polyethylene glycol condensation and high performance liquid column chromatography. Compared to the crude extract, its purity exhibited a 37.1-fold improvement and the recovery rate of enzyme activity was 21.3%. Meanwhile, SDS-PAGE analysis revealed a single band with molecular weight of 40 kD. Moreover, the optimal reaction conditions of this laccase towards ABTS as substrate included 50-60 ℃ of reaction temperature and pH 4.6. The Km value was 13.8 μmol/L under these optimal reaction conditions. Furthermore, the activity of the enzyme exhibited excellent stability below 60 ℃ and pH 3.0- 5.5, but could be inhibited by Fe2+, Al3+ and Mn2+ and enhanced by Hg+, Cu2+ and Mg2+. No obvious effect on laccase activity was observed due to Zn2+, Ba2+ and K+.

Key words: Ganoderma weberianum, laccase, purification, enzyme activity

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