›› 2010, Vol. 12 ›› Issue (6): 114-119.DOI: 10.3969/j.issn.1008-0864.2010.06.20

• 研究报告 • 上一篇    下一篇

脂环酸芽孢杆菌Alicyclobacillus sp. A15木聚糖酶基因xynA15的克隆表达及性质研究

王建设1,2,柏映国2,尹俊1,姚斌2   

  1. (1.内蒙古农业大学生命科学学院, 呼和浩特 010018|2.中国农业科学院饲料研究所, 农业部饲料生物技术重点开放实验室, 北京 100081)
  • 收稿日期:2010-03-22 修回日期:2010-06-22 出版日期:2010-12-15 发布日期:2010-09-15
  • 通讯作者: 姚斌,研究员,博士,博士生导师,从事微生物工程研究。Tel:010-82106053; E-mail: yaobin@caas-bio.net.cn。尹俊,教授,博士,硕士生导师,从事动物分子遗传学研究。E-mail: yinjunparis@163.com
  • 作者简介:王建设,硕士研究生,从事微生物遗传学研究。E-mail: wongjaction@163.com。
  • 基金资助:

    国家转基因生物新品种培育重大专项(2008ZX003-002);国家肉鸡产业技术体系(nycytx-42-G2-05)资助。

Cloning, Expression and Characterization Studies on Xylanase Gene, xynA15, from Alicyclobacillus sp.A15

WANG Jian-she1,2, BAI Ying-guo2, YIN Jun1, YAO Bin2   

  1. (1.College of Life Sciences, Inner Mongolia Agricultural University, Hohhot|2.Key Laboratory of Feed Biotechnology,
    Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China)
  • Received:2010-03-22 Revised:2010-06-22 Online:2010-12-15 Published:2010-09-15

摘要:

从云南保山市的一眼温泉中分离到一株嗜热嗜酸菌,脂环酸芽孢杆菌Alicyclobacillus sp.A15。通过同源克隆和TAIL-PCR方法,从该菌株中克隆得到一个木聚糖酶基因,xynA15,全长990 bp,编码329个氨基酸和一个终止密码子。将xynA15基因克隆到原核表达载体pET-22b(+)上,并转化至BL21(DE3),经过IPTG诱导,其表达产物具有木聚糖酶的活性。对其酶学性质研究发现,XynA15的最适温度为50℃,最适pH值为70,不仅在较广的温度范围(35℃~60℃)内具有较高的酶活,而且在50℃具有较好的热稳定性。

关键词: Alicyclobacillus sp.A15;木聚糖酶;酶学性质;原核表达

Abstract:

Alicyclobacillus sp.A15 was isolated from the outflow of a hot spring in Baoshan City, Yunnan Province, China. xynA15 was cloned from the strain through homogolous cloning and TAIL-PCR, which consists of 990 bp and encodes 329 amino acids and one stop codon. Then it was inserted into the prokaryotic expression vector pET-22b (+) and transformed into Escherichia coli BL21 (DE3). Xylanase activity was detected in the cultured supernantant after induced by Isopropyl-β-d-1-thiogalactopyranoside (IPTG). The optimal temperature and pH was 50℃ and 7.0, respectively for XynA15 activity. XynA15 contains higher activity at 35~60℃ and better thermal stability at 50℃.

Key words: Alicyclobacillus sp.A15, xylanase, enzymology character, prokaryotic expression

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