食品科学 ›› 2009, Vol. 30 ›› Issue (15): 160-163.doi: 10.7506/spkx1002-6630-200915036

• 生物工程 • 上一篇    下一篇

一株产胞外中性β- 葡萄糖苷酶菌株的鉴定及酶学特性研究

陈红漫,赵 璐,杨佳影   

  1. 沈阳农业大学
  • 收稿日期:2008-10-30 修回日期:2009-06-12 出版日期:2009-08-01 发布日期:2010-12-29
  • 通讯作者: 陈红漫 E-mail:hongmanc@hotmail.com

Identification of A Novel Bacillus Strain Capable of Producing Neutral β-Glucosidase and Characterization of Its Enzymatic Properties

CHEN Hong-man,ZHAO Lu,YANG Jia-ying   

  1. Shenyang Agricultural University, Shenyang 110161, China
  • Received:2008-10-30 Revised:2009-06-12 Online:2009-08-01 Published:2010-12-29
  • Contact: CHEN Hong-man, E-mail:hongmanc@hotmail.com

摘要:

从碱性土壤中分离筛选得到一株产胞外中性β- 葡萄糖苷酶的菌株ZL-110。采用16S rDNA 序列分析方法对其进行分子学鉴定,结果表明,其在分类学地位上归属于芽孢杆菌属。采用SDS-PAGE 方法测得该β- 葡萄糖苷酶的分子量约为43kD。酶学特性研究结果表明,该酶以水杨酸苷为底物时,最适pH 值与最适温度分别为7.0 和50℃,是一种中性酶,具有较好的热稳定性。

关键词: 中性酶, β- 葡萄糖苷酶, 16S rDNA, 酶学特性

Abstract:

A novel β-glucosidase-producing Bacillus strain ZL-110 was isolated from basic soil. The taxonomic position of this bacterium was investigated on the basis of 16S rRNA gene sequencing. Comparative computer database analyses revealed that the bacterium is a Bacillus subtilis strain. Based on the alignment of 16S rRNA sequences, we concluded that the novel B. subtilis strain ZL-110 is most closely related to the B. subtilis reference strain M01. SDS-PAGE analysis indicated that this β- glucosidase has a MW of 43 kD. When salicin was used as a substrate, the optimum reaction conditions for this enzyme were pH 7.0 and 50 ℃. In addition, this neutral enzyme demonstrated excellent thermostability.

Key words: neutral enzyme, β-glucosidase, 16S rDNA, enzymatic properties

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