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Properties of diacetyl (acetoin) reductase from Bacillus stearothermophilus

✍ Scribed by P. Paolo Giovannini; Alessandro Medici; Carlo M. Bergamini; Mario Rippa

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 433 KB
Volume: 4
Category: Article
ISSN: 0968-0896
DOI: 10.1016/0968-0896(96)00086-7

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✦ Synopsis

The cells of Bacillus stearothermophilus contain an NADH-dependent diacetyl (acetoin) reductase. The enzyme was easily purified to homogeneity, partially characterised, and found to be composed of two subunits with the same molecular weight. In the presence of NADH, it catalyses the stereospecific reduction of diacetyl first to (3S)-acetoin and then to (2S,3S)-butanediol; in the presence of NAD +, it catalyses the oxidation of (2S,3S)-and meso-butanediol, respectively, to (3S)-acetoin and to (3R)-acetoin, but is unable to oxidise these compounds to diacetyl. The enzyme is also able to catalyse redox reactions involving some endo-bicyclic octen-and heptenols and the related ketones, and its use is suggested also for the recycling of NAD + and NADH in enzymatic redox reactions useful in organic syntheses.

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