食品科学 ›› 2006, Vol. 27 ›› Issue (9): 76-79.

• 基础研究 • 上一篇    下一篇

基因工程菌1020耐热木聚糖酶的纯化与性质

 孙雷,  朱孝霖,  李环,  姚忠,  韦萍   

  1. 南京工业大学制药与生命科学学院
  • 出版日期:2006-09-15 发布日期:2011-10-20

Study on Purification and Properties of Thermo-stable Xylanase from Bioengineering Bacterium 1020

 SUN  Lei,   Zhu-Xiao-Lin,   Li-Huan,   Yao-Zhong,   Wei-Ping   

  1. College of Life Science and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing 210009, China
  • Online:2006-09-15 Published:2011-10-20

摘要: 通过热变性处理和Ni-NTA层析分离纯化基因工程菌1020耐热木聚糖酶。对热变性条件优化,70℃处理30min效果,纯化倍数4.9;利用木聚糖酶C端6个His标记对Ni-NTA琼脂糖凝胶的结合性,一步层析得到电泳纯的木聚糖酶。酶的最适反应温度为110℃,具有高度耐热性,在70℃保温8h,酶活基本不变,100℃保温5h后,酶活残余40%;在pH6.0~10.0范围内都有较高的酶活性和稳定性。低浓度的异丙醇对酶反应有促进作用,Hg2+对酶反应有强抑制作用。该酶对燕麦木聚糖的Km为0.55mg/ml,Vmax=14.26μmol/min·mg。

关键词: 耐热木聚糖酶, 热变性, Ni-NTA, 分离纯化, 性质

Abstract: The thermo stable xylanase from bioengineering bacterium 1020 was purified to electrophoretic homogeneity by heat treatment and Ni-NTA chromatography. The optimal conditions are: heat treated at 70℃ for 30min, and purification factor 4.9. Only one step chromatography of Ni-NTA makes xylanase up to electrophoretic homogeneity. The optimal temperature is 110℃, and can hold whole activity for 8h at 70℃ and 40% activity at 100℃ after 5h. Among the ranges from pH6.0 to pH10.0, the enzyme shows high activity. Low concentration of isopropyl alcohol accelerate enzyme activity while Hg2+ inhibits it.Mcihaelis constant of the enzyme is 0.55mg/ml, and Vmax is 14.26μmol/min·mg for the oat spelt xylan.

Key words: thermo-stable xylanase, heat treatment, Ni-NTA, separation and purification, properties