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中国生物工程杂志

China Biotechnology
China Biotechnology  2014, Vol. 34 Issue (12): 36-44    DOI: 10.13523/j.cb.20141206
    
High-level Heterogenous Expression of a Hyperthermophilic Esterase in Different Hosts
LUO Man-jie, XIE Yuan, QIAN Zhi-gang, FENG Yan, YANG Guang-yu
State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiaotong University, Shanghai 200240, China
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Abstract  

Thermophilic Esterase 2 (EST2) from Alicyclobacillus acidocaldarius belongs to the HSL group of the esterase/lipase superfamily. It has been reported to be the most active hyperthermophilic esterase with excellent thermostability, which makes it a good choice for many industrial applications, such as food industry, fine chemical industry, pulp and paper industry and environmental bio-mediation. However, the biomass yield and the basal enzyme expression level are remarkably low in the cultivation of hyperthermophiles, which results in the high cost for the large-scale production of EST2 in its natural host. Heterogenous production of EST2 in a proper host organism holds great potential to solve this problem. E. coli and Pichia pastoris are the most widely used hosts for the production of heterologous proteins. In order to establish the high-level expression system, the gene encoding EST2 was cloned and expressed in Pichia pastoris and E.coli, and the enzymatic properities of the recombinant proteins were systematically characterized and compared. The recombinant EST2 expressed in E.coli and Pichia pastoris showed very similar properties: the optimal temperatures were 75℃ and 77.5℃, the optimal pH were both 8.0, the specific activities were 4656.6 U/mg and 4078.3 U/mg, and the enzymes were stable up after incubation at 70℃ for 4.5h. After the optimized cultivation conditions in the shake flake, the expression of EST2 in different hosts was conducted in a 5 L fermentor by high cell-density fermentation. In Pichia pastoris, the recombinant EST2 was predominantly expressed extracellularly with activity of about 960 U/ml and a cell dry weight reached 68g/L after induction with methanol for 90h. On the other hand, the EST2 activity increased to 14825.6U/ml after 25h of fermentation in E.coli, with a cell dry weight of 60g/L. The expression level and productivity in E.coli are 14.4-fold and 73.2-fold higher than that of Pichia pastoris, respectively. The results illustrated that E.coli is more suited for the high-level expression of EST2 than Pichia pastoris, which will further promote wider application of EST2 in biotech industries.



Key wordsThermophilic Esterase 2      Heterologous expression      High cell-density fermentation      Echerichia coli      Pichia pastoris     
Received: 05 September 2014      Published: 25 December 2014
ZTFLH:  Q789  
Cite this article:

LUO Man-jie, XIE Yuan, QIAN Zhi-gang, FENG Yan, YANG Guang-yu. High-level Heterogenous Expression of a Hyperthermophilic Esterase in Different Hosts. China Biotechnology, 2014, 34(12): 36-44.

URL:

https://manu60.magtech.com.cn/biotech/10.13523/j.cb.20141206     OR     https://manu60.magtech.com.cn/biotech/Y2014/V34/I12/36


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