High-level expression of human arginase I in Pichia pastoris and its immobilization on chitosan to produce L-ornithine

BMC Biotechnology

Xue Zhang¹  Jin Liu¹  Xianhong Yu¹  Fei Wang¹  Li Yi¹  Zhezhe Li¹  Yunyun Liu¹  Lixin Ma¹ 

[1] Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan 430062, People’s Republic of China

关键词: Transformation;    L-arginine;    Chitosan;    Immobilization;    Recombinant human arginase I;    L-ornithine;   

Others  :  1223101
DOI  :  10.1186/s12896-015-0184-2

 received in 2014-12-05, accepted in 2015-07-24,  发布年份 2015

【 摘 要 】

Background

L-ornithine (L-Orn), is an intermediate metabolite in the urea cycle that plays a significant role in humans. L-Orn can be obtained from the catalysis of L-arginine (L-Arg) by arginase. The Pichia pastoris expression system offers the possibility of generating a large amount of recombinant protein. The immobilized enzyme technology can overcome the difficulties in recovery, recycling and long-term stability that result from the use of free enzyme.

Methods

The recombinant human arginase I (ARG I) was obtained using an optimized method with the Pichia pastoris GS115 as the host strain. Chitosan paticles were cross-linked with glutaraldehyde and rinsed exhaustively. Then the expressed ARG I was immobilized on the crosslinked chitosan particles, and the enzymatic properties of both the free and immobilized enzymes were evaluated. At last, the immobilized ARG I was employed to catalyze L-Arg to L-Orn.

Results

The results indicated that these two states both exhibited optimal activity under the same condition of pH10 at 40 °C. However, the immobilized ARG I exhibited the remarkable thermal and long-term stability as well as broad adaptability to pH, suggesting its potential for wide application in future industry. After a careful analysis of its catalytic conditions, immobilized ARG I was employed to catalyze the conversion of L-Arg to L-Orn under optimal condition of 1 % glutaraldehyde, 1 mM Mn ²⁺ , 40 °C, pH10 and an L-arginine (L-Arg) concentration of 200 g/L, achieving a highly converted content of 149.g/L L-Orn.

Conclusions

In this work, ARG Ι was abundantly expressed, and an efficient, facile and repeatable method was developed to synthesize high-quality L-Orn. This method not only solved the problem of obtaining a large amount of arginase, but also provided a promising alternative for the future industrial production of L-Orn.

【 授权许可】

   
2015 Zhang et al.

【 图 表 】

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