生物技术通报 ›› 2015, Vol. 31 ›› Issue (9): 183-189.doi: 10.13560/j.cnki.biotech.bull.1985.2015.09.026

• 研究报告 • 上一篇    下一篇

MntH与含锰过氧化氢酶共表达基因工程菌的构建与发酵优化

王慧1, 崔云风1, 刘岩2, 史吉平2, 赵志军2, 王绍明1   

  1. (1.石河子大学生命科学学院,石河子 832000;2.中国科学院上海高等研究院,上海 201210)
  • 收稿日期:2015-01-06 出版日期:2015-09-15 发布日期:2015-09-16
  • 作者简介:王慧,女,硕士,研究方向:酶学;E-mail:wanghui2014xy@126.com
  • 基金资助:
    国家自然科学基金资助项目(31300048)

Construction of Co-expressed MntH and Mn-catalase Gene in Escherichia coli and Optimization of Fermentation Conditions

Wang Hui1, Cui Yunfeng 1, Liu Yan2, Shi Jiping2, Zhao Zhijun2, Wang Shaoming1   

  1. (1. College of Life Science,Shihezi University,Shihezi 832000;2. Shanghai Advanced Research Institute of Chinese Academy of Sciences,Shanghai 201210)
  • Received:2015-01-06 Published:2015-09-15 Online:2015-09-16

摘要: 构建Mn2+转运蛋白MntH与来源于Thermus thermophilus HB27的含锰过氧化氢酶的共表达基因工程菌,并进行了发酵培养基及培养环境条件的优化,确定培养基中最佳的碳氮源种类及其浓度分别为:甘油 7.0 g/L,酵母粉 3.75 g/L和蛋白胨 11.25 g/L;当培养基中的Mn2+浓度为1 mmol/L时,最佳的IPTG诱导浓度为0.05 mmol/L。此外,最佳的培养基初始pH值及培养温度分别为:pH 8.0和37℃,在最优发酵条件下工程菌摇瓶发酵培养24 h,过氧化氢酶活最高可达476 U/mL是未优化前3倍。在5 L发酵罐的验证实验中,过氧化氢酶的酶活进一步提高至1 094 U/mL。

关键词: 锰过氧化氢酶, 转运蛋白, 共表达, 发酵优化

Abstract: Mn-catalase from Thermus thermophilus HB27 and Mn2+ transport protein MntH from Escherichia coli were co-expressed in E. coli BL21(DE3). The optimization of fermentation medium and environment for the production of Mn-catalase was carried out at the shake flask level. The optimal carbon and nitrogen source were 7.0 g/L glycerine, 3.75 g/L yeast extract and 11.25 g/L peptone respectively. The optimum induced concentration of IPTG was 0.05 mmol/L while the Mn2+ in media was 1 mmol/L. In addition, the optimal initial pH of the medium and culture temperature were pH 8.0 and 37℃ respectively. Under the optimal conditions, the maximal activity of catalase reached 476 U/mL, which was 3-fold of the control. Finally, in a 5 L fermentor the activity of catalase increased to 1 094 U/mL.

Key words: Mn-catalase, transport protein, co-expression, optimization of fermentation