Construction and application of temperature sensitive thermotolerant systemin Escherichia coli

doi:10.11949/j.issn.0438-1157.20141929

CIESC Journal ›› 2015, Vol. 66 ›› Issue (7): 2613-2619.DOI: 10.11949/j.issn.0438-1157.20141929

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Construction and application of temperature sensitive thermotolerant systemin Escherichia coli

JIA Haiyang¹, SUN Huan¹, SUN Xiangying², FENG Xudong¹, LI Chun^1,2

1 School of Life Science, Beijing Institute of Technology, Beijing 100081, China;
2 Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, Xinjiang, China

Received:2014-12-29 Revised:2015-03-24 Online:2015-07-05 Published:2015-07-05
Supported by:
supported by the National Basic Research Program of China (2011CBA00800), the National Natural Science Foundation of China (21376028) and the National Science Fund for Distinguished Youth Scholars of China (21425624).

大肠杆菌温敏耐热系统的构建与应用

贾海洋¹, 孙欢¹, 孙翔英², 冯旭东¹, 李春^1,2

1 北京理工大学生命学院生物工程系, 北京 100081;
2 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

通讯作者: 李春
基金资助:
国家重点基础研究发展计划项目(2011CBA00800);国家自然科学基金项目(21376028);国家杰出青年科学基金项目(21425624)。

Abstract

Abstract:

The heat stress produced in fermentation process can not only affect the growth and reproduction of microorganisms, but also increases production cost from cooling and temperature control. The improvement of strain thermotolerance is highly desire for fermentation industry, which could significantly go up productivity and reduce production cost. So in this study, an artificial design and synthesis RNA switch with temperature sensitivity is employed to regulate and control the heat shock protein Dnak from Thermoanaerobacter tengcongensis MB4, which leads to the thermotolerance improvement of Escherichia coli. This improvement not only alleviated the burden of overexpressing heat shock protein in Escherichia coli at 37℃, but also enhanced its productivity at high temperature. The results of application test show that at 40℃ the output of lysine produced by E. coli increases by 2.95 folds, when compared with control group. This success could be twilight for the development of new method to prepare thermotalerance microorganisms.

Key words: biotechnology, synthetic biology, fermentation, thermotolerance, temperature sensitive RNA switch, heat shock protein, lysine

摘要：

发酵过程中热胁迫不仅影响微生物的生长和生产,还因冷却控温增加了生产成本。通过人工设计合成的温敏型RNA开关调控来源于腾冲嗜热菌(Thermoanaerobacter tengcongensis MB4)的热激蛋白DnaK的表达,该温敏型耐热系统显著提高了大肠杆菌的耐热性,同时还减少了大肠杆菌在37℃过表达热激蛋白的代谢负荷。将该系统应用于产赖氨酸大肠杆菌的高温发酵,不仅强化了其在40℃下的生长能力,而且显著提高了其在高温下的生产能力,赖氨酸产量比对照组提高了2.95倍。温敏型耐热系统的应用为人工耐热生物系统的构建提供了新方法。

关键词: 生物技术, 合成生物学, 发酵, 耐热性, RNA温敏开关, 热激蛋白, 赖氨酸

CLC Number:

Q789

JIA Haiyang, SUN Huan, SUN Xiangying, FENG Xudong, LI Chun. Construction and application of temperature sensitive thermotolerant systemin Escherichia coli[J]. CIESC Journal, 2015, 66(7): 2613-2619.

贾海洋, 孙欢, 孙翔英, 冯旭东, 李春. 大肠杆菌温敏耐热系统的构建与应用[J]. 化工学报, 2015, 66(7): 2613-2619.

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Construction and application of temperature sensitive thermotolerant systemin Escherichia coli

大肠杆菌温敏耐热系统的构建与应用

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