title: A genomic search approach to identify carbonyl reductases in Gluconobacter oxydans for enantioselective reduction of ketones.
abstract: The versatile carbonyl reductases from Gluconobacter oxydans in the enantioselective reduction of ketones to the corresponding alcohols were exploited by genome search approach. All purified enzymes showed activities toward the tested ketoesters with different activities. In the reduction of 4-phenyl-2-butanone with in situ NAD(P)H regeneration system, (S)-alcohol was obtained with an e.e. of up to 100% catalyzed by Gox0644. Under the same experimental condition, all enzymes catalyzed ethyl 4-chloroacetoacetate to give chiral products with an excellent e.e. of up to 99%, except Gox0644. Gox2036 had a strict requirement for NADH as the cofactor and showed excellent enantiospecificity in the synthesis of ethyl (R)-4-chloro-3-hydroxybutanoate. For the reduction of ethyl 2-oxo-4-phenylbutyrate, excellent e.e. (>99%) and high conversion (93.1%) were obtained by Gox0525, whereas the other enzymes showed relatively lower e.e. and conversions. Among them, Gox2036 and Gox0525 showed potentials in the synthesis of chiral alcohols as useful biocatalysts.
authors.affiliation: a State Key Laboratory of Bioreactor Engineering , New World Institute of Biotechnology, East China University of Science and Technology , Shanghai , China.
authors.forename: Rong
authors.initials: R
authors.lastname: Chen
authors.forename: Xu
authors.initials: X
authors.lastname: Liu
authors.forename: Jinping
authors.initials: J
authors.lastname: Lin
authors.forename: Dongzhi
authors.initials: D
authors.lastname: Wei
mesh_terms: D000429:Alcohol Oxidoreductases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D000595:Amino Acid Sequence; D003067:Coenzymes / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D023281:Genomics; D020600:Gluconobacter oxydans / Q000201:enzymology* / Q000235:genetics*; D007659:Ketones / Q000737:chemistry* / Q000378:metabolism*; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction; D017421:Sequence Analysis; D013237:Stereoisomerism; D013379:Substrate Specificity
chemical_list: D003067:Coenzymes; D007659:Ketones; D000429:Alcohol Oxidoreductases
keywords: carbonyl reductase; chiral alcohols; enantioselective reduction