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Molecular Cloning and Characterization of a cis-Epoxysuccinate Hydrolase from Bordetella sp. BK-52
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  • Molecular Cloning and Characterization of a cis-Epoxysuccinate Hydrolase from Bordetella sp. BK-52
저자명
Pan. Hai Feng,Bao. Wen Na,Xie. Zhi Peng,Zhang. Jian Guo,Li. Yongquan
간행물명
Journal of microbiology and biotechnology
권/호정보
2010년|20권 4호|pp.659-665 (7 pages)
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한국미생물생명공학회
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

A cis-epoxysuccinate hydrolase (CESH) from Bordetella sp. BK-52 was purified 51.4-fold with a yield of 27.1% using ammonium sulfate precipitation, ionic exchange, hydrophobic interaction, molecular sieve chromatography and an additional anion-exchange chromatography. The CESH was stable in a broad range of temperature (up to $50^{circ}C$) and pH (4.0-10.0) with optima of $40^{circ}C$ and pH 6.5, respectively. It could be partially inhibited by EDTA-$Na_2$, $Ag^+$, SDS, and DTT, and slightly enhanced by $Ba^{2+}$ and $Ca^{2+}$. The enzyme exhibited high stereospecificity in D(-)-tartaric acid (enantiomeric excess value higher than 99%) with $K_m$ and $V_max$ values of 18.67 mM and $94.34;{mu}M$/min/mg for disodium cis-epoxysuccinate, respectively. The Bordetella sp. BK-52 CESH gene, which contained 885 nucleotides (open reading frame) encoding 294 amino acids with a molecular mass of about 32 kDa, was successfully overexpressed in Escherichia coli using a T7/lac promoter vector and the enzyme activity was increased 42-times compared with the original strain. It may be an industrial biocatalyst for the preparation of D(-)-tartaric acid.