食品科学 ›› 2003, Vol. 24 ›› Issue (5): 72-75.

• 基础研究 • 上一篇    下一篇

里氏木霉纤维素酶的纯化和性质

 曹健, 郭德宪, 曾实, 汪晨辉   

  1. 郑州工程学院生物工程系
  • 出版日期:2003-05-15 发布日期:2011-12-13

Study on Purification and Characteristics of Trichoderma reesei Cellulase

 CAO  Jian, GUO  De-Xian, ZENG  Shi, WANG  Chen-Hui   

  • Online:2003-05-15 Published:2011-12-13

摘要: 培养里氏木霉所得的纤维素酶粗酶液经硫酸铵盐析,透析脱盐和柱层析,紫外检测仪记录结果显示出四个蛋白质峰。经SDS-聚丙烯酰胺凝胶电泳后有四条明显的蛋白质谱带。相对分子量分别为74,000、55,000、47,000、26,000左右。根据分子量大小和蛋白组份的含量分析,这四种组分可能是β-葡萄糖苷酶,CBHI,CBHII和EGI。本实验得到的纤维素酶最适作用pH值在5.0左右,最适作用温度50℃左右。酶在pH4.0~6.0以及温度低于50℃时较稳定。Hg2+、Ag2+、Al3+、Pb2+、Fe3+对酶有强烈的抑制作用,而Mn2+、Co2+、Fe2+、Zn2+、Ca2+对酶有一定的激活作用。

关键词: 里氏木霉, 纤维素酶, 纯化, 性质

Abstract: The crude cellulase of Trichoderma reesei was purified twice by ammonium sulfate fractionation, dialysis andSephadex G-100 gel filtration. The purified cellulase showed that the four distinct protein bands assayed by SDS-PAGE,showed molecular weights about 74,000、55,000、47,000、26,000, respectively. According to the molecular weight andconcentration, the four compositions were assayed as β-glucanase, CBHI, CBHII and EGI. The optimal degrading conditionsfor cellulase obtained were pH 5.0 and 50℃. The enzyme was stable between pH4.0 and 6.0, and at a temperature below 50℃.When innocubated at 70℃ for 30min, 90% of enzyme activity would be lost. When pH was beyond 8.0, almost all enzymeactivity would be lost. The enzyme activity was distinctively inhibited by metal ions such as Hg2+、Ag2+、Al3+、Pb2+ andFe3+, but enhanced by Mn2+、Co2+、Fe2+、Zn2+ and Ca2+, By Na+、Mg2+、Ba2+、Cu2+ and Ni2+ it had no significanteffect.

Key words: Trichoderma reesei, cellulase, purification, characteristics