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中国生物工程杂志

China Biotechnology
China Biotechnology  2014, Vol. 34 Issue (7): 24-29    DOI: 10.13523/j.cb.20140704
    
Expression Studies of Ascorbate Peroxidase from Lycium chinense Mill. in E.coli and Yeast
GAO Hai-ling1, JI Jing1, WANG Gang1, WU Guang-xia2, RONG Fei1, GUAN Chun-feng1, JIN Chao1
1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China;
2. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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Abstract  

Objective:The aim of the study is to investigate the expression and enzymatic properties in E.coli and oxidation resistance in yeast of ascorbate peroxidase (LmAPX) cloned from Lycium chinense Mill., which will provide the theory foundation of antioxidant stress for future studying.Method: LmAPX was transformed into heterologous expression system E.coli BL21 and wild type yeast strain W303. The recombinant protein was purified by Ni2+ affinity chromatography and the enzyme activities at different temperature and pH were detected. The enzyme kinetics constant Km and Vmax were calculated by double-reciprocal plot. Results: The results showed that the optimal pH and temperature for this enzyme were 6.5 and 40℃, respectively.At fixed concentration of AsA, the Km and Vmax values of the enzyme for H2O2 were 0.17±0.02 mmol/L and 11.78±1.88 mmol/min·mg. And at fixed concentration of H2O2, the Km and Vmax values for AsA were 2.19±0.40 mmol/L and 58.82±3.51 mmol/min·mg. Tansgenic yeast stain transformed with LmAPX gene showed higher stress resistance than the control in the medium containing 8 mmol/L H2O2 or 100 mmol/L NaCl under the inducement of β-galactose. Conclusion: LmAPX enhanced the tolerance to oxidative stresses.



Key wordsLycium chinense Mill.      Ascorbate peroxidase      Enzymatic analysis      Oxidative stress     
Received: 12 May 2014      Published: 25 July 2014
ZTFLH:  Q78  
Cite this article:

GAO Hai-ling, JI Jing, WANG Gang, WU Guang-xia, RONG Fei, GUAN Chun-feng, JIN Chao. Expression Studies of Ascorbate Peroxidase from Lycium chinense Mill. in E.coli and Yeast. China Biotechnology, 2014, 34(7): 24-29.

URL:

https://manu60.magtech.com.cn/biotech/10.13523/j.cb.20140704     OR     https://manu60.magtech.com.cn/biotech/Y2014/V34/I7/24


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