Cloning, sequencing, and expression of a novel epoxide hydrolase gene from Rhodococcus opacus in Escherichia coli and characterization of enzyme
文献类型: 外文期刊
作者: Liu, Zhiqiang 1 ; Li, Yin 2 ; Xu, Yingying 2 ; Ping, Lifeng 2 ; Zheng, Yuguo 2 ;
作者机构: 1.Zhejiang Univ Technol, Inst Bioengn, Hangzhou 310014, Peoples R China
2.Zhejiang Univ Technol, Inst Bioengn, Hangzhou 310014, Peoples R China; N Dakota State Univ, Dept Plant Sci, Fargo, ND 58105 USA; Zhejiang Acad Agr Sci, Inst Qual & Stand Agr Prod, Hangzhou 310021, Peoples R China
关键词: cloning;prokaryotic expression;epoxide hydrolase;rhodococcus opacus ML-0004;characterization;DIRECTED EVOLUTION;ASPERGILLUS-NIGER;BACTERIAL-CELLS;ENCODING GENE;PURIFICATION;RADIOBACTER;HYDROLYSIS;ACID
期刊名称:APPLIED MICROBIOLOGY AND BIOTECHNOLOGY ( 影响因子:4.813; 五年影响因子:4.697 )
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: An epoxide hydrolase gene of about 0.8 kb was cloned from Rhodococcus opacus ML-0004, and the open reading frame (ORF) sequence predicted a protein of 253 amino acids with a molecular mass of about 28 kDa. An expression plasmid carrying the gene under the control of the tac promotor was introduced into Escherichia coli, and the epoxide hydrolase gene was successfully expressed in the recombinant strains. Some characteristics of purified recombinant epoxide hydrolase were also studied. Epoxide hydrolase showed a high stereospecificity for L(+)-tartaric acid, but not for D(+)-tartaric acid. The epoxide hydrolase activity could be assayed at the pH ranging from 3.5 to 10.0, and its maximum activity was obtained between pH 7.0 and 7.5. The enzyme was sensitive to heat, decreasing slowly between 30 degrees C and 40 degrees C, and significantly at 45 degrees C. The enzyme activity was activated by Ca2+ and Fe2+, while strongly inhibited by Ag+ and Hg+, and slightly inhibited by Cu2+, Zn2+, Ba2+, Ni+, EDTA-Na-2 and fumarate.
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