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A gene encoding a stereo-specific secondary alcohol dehydrogenase (CpSADH) that catalyzed the oxidation of (S)-1,3-BDO to 4-hydroxy-2-butanone was cloned from Candida parapsilosis. This CpSADH-gene consisted of 1,009 nucleotides coding for a protein with M r 35,964. A recombinant Escherichia coli JM109 strain harboring the expression plasmid, pKK-CPA1, produced (R)-1,3-BDO (93.5% ee, 94.7% yield) from the racemate without any additive to regenerate NAD+ from NADH.
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