食品科学 ›› 2003, Vol. 24 ›› Issue (2): 26-28.

• 基础研究 • 上一篇    下一篇

乳链球菌乳糖酶基因的分子克隆

 冉雪琴, 王嘉福, 吴拥军, 朱秋劲   

  1. 贵州大学生物技术学院
  • 出版日期:2003-02-15 发布日期:2011-12-13

Study on Cloning and Expression of the β-galactase Gene from Streptococcus Lactis 6030 in Esherichia Coli

 RAN  Xue-Qin, WANG  Jia-Fu, WU  Yong-Jun, ZHU  Qiu-Jin   

  • Online:2003-02-15 Published:2011-12-13

摘要: 以LacDNA片段为探针,筛选了pUCl9为载体构建的乳链球菌(S.1actis)6030菌株的质粒DNA文库,得到插入片段约5.0kb的阳性克隆,并对插入片段进行限制性酶切分析;用ONPG法测定了重组质粒在大肠杆菌细胞中乳糖酶的表达水平。

关键词: 乳链球菌, 乳糖酶基因, 分子克隆

Abstract: Lactose metabolism in Streptococcus lactis 6030 was associated with a large plasmid bank. The genes encoding β-galactase from the plasmid of S. lactis 6030 was cloned into the vector pUCl9 in Esherichia coli. The restriction endonuclease map of the 5.0kb PstI insert fragment was analyzed. The recombinant plasmid was expressed in E.coli by IPTG induction,and theβ-galactase production level and activity were determined by the ONPG method.

Key words: Streptococcus Lactis, β-galactase gene, cloning and expression