期刊
PROCESS BIOCHEMISTRY
卷 42, 期 5, 页码 889-894出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2007.01.009
关键词
Rhodococcus opacus ML-0004; epoxide hydrolase; L.(+)-tartaric acid; isolation; identification
Rhodococcus sp. ML-0004, a novel strain for producing epoxide hydrolase, was isolated from soil in this study. The epoxide hydrolase can catalyze the stereo-specific hydrolysis of cis-epoxysuccinic acid to generate L(+)-tartaric acid. By examining physiological, biochemical characteristics and comparing its 16S rDNA gene sequence, it was identified as Rhodococcus opacus, and named R. opacus ML-0004. The optimal conditions for epoxide hydrolase production from R. opacus ML-0004 were also investigated. Propanediol and (NH4)(2)SO4 were selected as carbon source and nitrogen source, respectively, for the production of R. opacus ML-0004 epoxide hydrolase. The optimal conditions for epoxide hydrolase production were fermentation temperature = 28 degrees C, pH 7.0, and cultivation time = 26 h. Under these conditions, the maximum epoxide hydrolase activity reached 10.5 U mL(-1). (C) 2007 Elsevier Ltd. All rights reserved.
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