Ontology type: schema:ScholarlyArticle
2010-04-15
AUTHORSHua-Ping Dong, Zhi-Qiang Liu, Yu-Guo Zheng, Yin-Chu Shen
ABSTRACT(R)-ethyl-3-hydroxyglutarate with highly optical purity (≥99%) can be used as a novel precursor for synthesis of chiral side chain of rosuvastatin. In this study, a novel synthesis route of (R)-ethyl-3-hydroxyglutarate by whole microorganism cells from racemic ethyl 4-cyano-3-hydroxybutyate was created. A strain ZJB-0910 capable of transforming racemic β-hydroxy aliphatic nitrile was isolated by employing a screening method based on a colorimetric reaction of Co2+ ion with ammonia, and identified as Rhodococcus erythropolis based on its morphology, physiological tests, Biolog, and the 16S rDNA sequence. After cultivation in a sterilized medium with composition of 20 g glucose, 5 g yeast extract, 0.5 g KH2PO4, 0.5 g K2HPO4, 0.2 g MgSO4·7H2O per liter at 30°C and 150 rpm for 48 h, the whole cells of R. erythropolis ZJB-0910 were prepared as a catalyst in (R)-enantioselective hydrolysis of racemic ethyl 4-cyano-3-hydroxybutyate for synthesis of (R)-ethyl-3-hydroxyglutarate, without bearing hydrolase activity for the ester bond of ethyl 4-cyano-3-hydroxybutyate. Under the optimized biotransformation conditions of pH 7.5, 30°C, and 20 mM substrate concentration, (R)-ethyl-3-hydroxyglutarate with 46.2% yield (ee > 99%) was afforded, and its chemical structure was determined by ESI-MS, NMR, and IR. The apparent Michaelis constant Km and maximum rate Vmax for this biocatalytic reaction were 0.01 M and 85.6 μmol min−1 g−1, respectively. More... »
PAGES1335-1345
http://scigraph.springernature.com/pub.10.1007/s00253-010-2584-5
DOIhttp://dx.doi.org/10.1007/s00253-010-2584-5
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/20393698
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