食品科学

• 生物工程 • 上一篇    下一篇

β-1,3-1,4-葡聚糖酶高产菌诱变选育及基因克隆表达

陈 计,高 鹏,陆兆新,吕凤霞,张 充,赵海珍,别小妹*   

  1. 南京农业大学食品科技学院,江苏 南京 210095
  • 出版日期:2015-01-15 发布日期:2015-01-16

Breeding of High-Yield β-1,3-1,4-Glucanase-Producing Strain by Mutagenesis, and Cloning and Expression of β-1,3-1,4-Glucanase Gene

CHEN Ji, GAO Peng, LU Zhaoxin, LÜ Fengxia, ZHANG Chong, ZHAO Haizhen, BIE Xiaomei*   

  1. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
  • Online:2015-01-15 Published:2015-01-16

摘要:

为获得β-1,3-1,4-葡聚糖酶高产菌株,以高地芽孢杆菌YC-9为出发菌株,通过亚硝基胍(nitrosoguanidine,NTG)和低能N+束诱变育种,筛选和选育得到两株突变株N-2-2和10-30s-3,发酵培养60 h,酶活力分别达到28.6 U/mL和36.1 U/mL,分别是出发菌株的2.36 倍和2.98 倍,与YC-9菌株相比,突变菌株菌体生长下降但发酵产酶量增加。进一步将β-1,3-1,4-葡聚糖酶克隆并在大肠杆菌中成功表达,经过30 ℃诱导6 h后,胞内酶活力达79.2 U/mL,为出发菌株的6.5 倍。

关键词: 高地芽孢杆菌, &beta, -1, 3-1, 4-葡聚糖酶, 亚硝基胍诱变, 低能N+束注入, 异源表达

Abstract:

In order to obtain a high-yield β-1,3-1,4-glucanase producing strain, Bacillus altitudinis YC-9 was used as the
starting strain and mutagenized sequentially with nitrosoguanidine (NTG) and N+ beam. The preliminary and secondary
screening results showed that strain N-2-2 and 10-30s-3 had high ability to produce β-1,3-1,4-glucanase, with a yield of 28.6
and 36.1 U/mL, which revealed a 2.36- and 2.98-fold increase compared with that of the original strain, respectively, while
exhibiting reduced growth rates. Furthermore, the β-1,3-1,4-glucanase gene was successfully cloned and expressed in E. coli.
The intracellular activity was 79.2 U/mL, a 6.5-fold increase compared with the original strain, when induced at 30 ℃ for 6 h.

Key words: Bacillus altitudinis, β-1,3-1,4-glucanase, nitrosoguanidine (NTG) mutagenesis, N+ beam implantation, heterologous expression

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