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林产化学与工业 ›› 2009, Vol. 29 ›› Issue (4): 17-22.

• 研究报告 • 上一篇    下一篇

链霉菌Z18中一种木聚糖酶(XynA)的纯化和性质

闫巧娟1, 翟倩2, 江正强2   

  1. 1. 中国农业大学学院, 北京 100083;2. 中国农业大学 食品科学与营养工程学院, 北京 100083
  • 收稿日期:2008-07-22 修回日期:1900-01-01 出版日期:2009-08-30 发布日期:2009-08-30
  • 通讯作者: 江正强,教授,从事食品生物技术方面的研究;E-mail:zhqjiang@cau.edu.cn。

Purification and Properties of A Xylanase (XynA) Produced by Streptomyces sp.Z18

YAN Qiao-juan1, ZHAI Qian2, JIANG Zheng-qiang2   

  1. 1. College of Engineering, China Agricultural University, Beijing 100083, China;2. College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
  • Received:2008-07-22 Revised:1900-01-01 Online:2009-08-30 Published:2009-08-30

摘要: 研究了链霉菌Z18中一种低分子质量木聚糖酶(XynA)的纯化和性质。粗酶液经过 20%~50% 硫酸铵沉淀和S-300凝胶过滤两步纯化得到电泳纯的XynA,分子质量为 22 ku,最适pH值为7.0,pH值稳定范围在5.0~8.0之间;最适温度为 60℃,稳定温度为 50℃。XynA对不同木聚糖表现出较高的活力,对其它所试底物无活性。XynA水解桦木木聚糖的主要产物为木二糖和木三糖,无木糖生成,说明它适合应用于低聚木糖的生产。

关键词: 链霉菌, 木聚糖酶, 纯化, 低聚木糖

Abstract: A low-molecular xylanase (XynA) produced by Streptomyces sp.Z18 was purified and characterized in this study. XynA was purified by 20%-50% ammonium sulfate precipitation and Sephacryl S-300 gel filtration chromatography. The denatured molecular weight of XynA was 22 ku. The optimal temperature and pH value for xylanase activity were 60℃ and 7.0, respectively. The xylanase was stable within pH value 5.0-8.0 and up to 50℃. XynA exhibitedhigh specificity toward different xylans and low or no activity toward other substrates tested. Thehydrolysis of birchwood xylan yielded mainly xylobiose and xylotriose, no xylose was detected by TLC. Therefore, XynA may be suitable for production of xylooligosaccharides.

Key words: Streptomyces, xylanase, purification, xylooligosaccharides

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