The enantioselective reduction of alkyl 3-oxobutanoates by carbonyl reductase (S1) from Candidamagnoliae was investigated. S1 reduced alkyl 4-halo-3-oxobutanoates to the corresponding enantiomerically pure (S)-3-hydroxy esters. Escherichiacoli HB101 transformant co-overproducing the S1 and glucose dehydrogenase from Bacillusmegaterium, produced optically pure alkyl 4-substituted-3-hydroxybutanoates in a ...