生物技术通报 ›› 2013, Vol. 0 ›› Issue (2): 130-134.

• 研究报告 • 上一篇    下一篇

葡萄穗霉木聚糖酶XYA6205 在黑曲霉中的表达及酶学特性分析

王红霞1,2 王华明2 张大龙2 罗成1   

  1. (1. 天津科技大学食品工程与生物技术学院 食品营养与安全教育部重点实验室,天津 300457; 2. 中国科学院天津工业生物技术研究所,天津 300308)
  • 收稿日期:2012-09-03 修回日期:2013-02-27 出版日期:2013-02-26 发布日期:2013-02-27
  • 作者简介:王红霞,女,硕士研究生,研究方向:食品及生物技术;E-mail :whongx@163.com罗成,男,博士,教授,博士生导师,研究方向:食品科学,生物技术及免疫学;E-mail :Luo58@yahoo.com
  • 基金资助:
    天津科委真菌-淀粉酶高温活性改造和新型酶遗传工程技术开发项目(10ZCKFSY06200)

Heterologous Expression and Characterization of Xylanase XYA6205 from Stachybotrys chartarum

Wang Hongxia1,2 Wang Huaming2 Zhang Dalong2 Luo Cheng1   

  1. (1. Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Ministry of Education, School of Food
  • Received:2012-09-03 Revised:2013-02-27 Published:2013-02-26 Online:2013-02-27

摘要: 木聚糖酶是涉及半纤维素水解的主要酶,具有重要的应用价值。将葡萄穗霉上可能为木聚糖酶的基因xya6205(含信号肽)克隆到载体pGm 上,进而通过原生质体-PEG 转化到黑曲霉G1 上。得到的目的转化子经过摇瓶培养发酵,SDS-PAGE 分析表明,产生了大小为20 kD 左右的蛋白条带。DNS 法测定1 L 发酵液5 d 酶活,比活达392 U/mg,其最适温度为50℃,最适pH为5.8,在不同pH 缓冲液中处理18 h 后,最高仍有83% 残余酶活。

关键词: 木聚糖酶, 黑曲霉, 克隆, 酶活, 葡萄穗霉

Abstract: Xylanase, the main enzyme to hydrolysis hemicellulose, has important application in industry. In this study, a gene xya6205 (with signal peptide)from Stachybotrys chartarum was inserted to an expression vector, eventually an recombinant plasmid pGm-xya6205 was constructed, and then transformed into A. niger G1 mediated by PEG4000. The transformants were confirmed by PCR analysis, and the recombinant xylanase of heterologously expressed protein in SDS-PAGE was about 20 kD. The optimal temperature and pH of the enzyme activity was 50℃ and 5.8, respectively. The recombinant enzyme specific activity reached 392 U/mg by DNS method at optimal condition. The recombinant enzyme remained 83% activity after 18 h in the alkaline buffer.

Key words: Xylanase, Aspergillus niger, Cloning, Activity, Stachybotrys chartarum