化工学报 ›› 2014, Vol. 65 ›› Issue (8): 3128-3135.DOI: 10.3969/j.issn.0438-1157.2014.08.038

• 生物化学工程与技术 • 上一篇    下一篇

大肠杆菌耐热元器件的构建及其应用

孙翔英1, 刘月芹2, 孙欢2, 贾海洋2, 戴大章2, 李春1,2   

  1. 1 石河子大学化学化工学院/兵团绿色化工过程重点实验室, 新疆 石河子 832003;
    2 北京理工大学生命学院生物工程系, 北京 100081
  • 收稿日期:2013-11-06 修回日期:2013-12-24 出版日期:2014-08-05 发布日期:2014-08-05
  • 通讯作者: 李春
  • 基金资助:

    国家重点基础研究发展计划项目(2013CB733900);国家自然科学基金项目(21376028);博士点基金项目(20121101110050)。

Construction of heat resistance devices for Escherichia coli and their application

SUN Xiangying1, LIU Yueqin2, SUN Huan2, JIA Haiyang2, DAI Dazhang2, LI Chun1,2   

  1. 1 Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan/School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, Xinjiang, China;
    2 School of Life Science, Beijing Institute of Technology, Beijing 100081, China
  • Received:2013-11-06 Revised:2013-12-24 Online:2014-08-05 Published:2014-08-05
  • Supported by:

    supported by the National Basic Research Program of China (2013CB733900), the National Natural Science Foundation of China (21376028) and the Doctoral Fund of Ministry of Education of China (20121101110050).

摘要: 以提高大肠杆菌耐热性为目的,基于腾冲嗜热菌(Thermoanaerobacter tengcongensis MB4)热激蛋白基因 T.te-HSP20 构建了诱导型耐热元器件T7-T.te-HSP20 和组成型耐热元器件gapA-T.te-HSP20,转入大肠杆菌(Escherichia coli)获得工程菌 E. coli-TH 和 E. coli-GH。工程菌E. coli-TH在30℃和IPTG诱导下,目标蛋白呈可溶性表达,经50℃热激30 min后,存活率提高了3.2倍。高温发酵表明gapA-T.te-HSP20扩宽了工程菌E. coli-GH的最适生长温度的范围(37~43℃),较大程度提高了大肠杆菌的耐热性。抗逆性分析还发现工程菌E. coli-GH具备了耐热与耐丁醇的双重功能,并有一定的抗乙酸和乙醇能力。为工业梯度升温发酵生产生物基产品的高效制造、节省成本提供了新思路。

关键词: 耐热性, 热激蛋白, 存活率, 抗逆性, 大肠杆菌

Abstract: To improve the heat resistance of Escherichia coli, an inducible heat-resistance device T7-T.te-HSP20 and a constitutive heat-resistance device gapA-T.te-HSP20 based on T.te-HSP20 gene from Thermoanaerobacter tengcongensis MB4, and corresponding engineered strains E. coli-TH and E. coli-GH were constructed. The targeted protein was expressed in solubility after IPTG induction at 30℃ in E. coli-TH. Meanwhile, the survival rate of E. coli-TH was 3.2 times higher than the control at 50℃ for 30 min. The result of high-temperature fermentation showed that the optimum temperature range of E. coli-GH was broadened (37-43℃) under the regulation of heat resistance device gapA-T.te-HSP20. Stress resistance analysis showed that E. coli-GH not only possessed heat resistance and butanol resistance, but also had some resistance to acetic acid and ethanol. These results provide a new idea for modern microorganisms industry.

Key words: heat resistance, heat shock protein (HSP), survival rate, stress resistance, Escherichia coli

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