ExplorEnz: EC 1.1.1.304

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1.1.1.304

Accepted name:

diacetyl reductase [(S)-acetoin forming]

Reaction:

(S)-acetoin + NAD⁺ = diacetyl + NADH + H⁺

Other name(s):

(S)-acetoin dehydrogenase

Systematic name:

(S)-acetoin:NAD⁺ oxidoreductase

Comments:

The reaction is catalysed in the reverse direction. This activity is usually associated with butanediol dehydrogenase activity (EC 1.1.1.4 or EC 1.1.1.76). While the butanediol dehydrogenase activity is reversible, diacetyl reductase activity is irreversible. This enzyme has been reported in the bacteria Geobacillus stearothermophilus, Enterobacter aerogenes and Klebsiella pneumoniae [1-3]. Different from EC 1.1.1.303, diacetyl reductase [(R)-acetoin forming].

Links to other databases:

BRENDA, EXPASY, KEGG, MetaCyc, PDB

References:

1.	Giovannini, P.P., Medici, A., Bergamini, C.M. and Rippa, M. Properties of diacetyl (acetoin) reductase from Bacillus stearothermophilus. Bioorg. Med. Chem. 4 (1996) 1197–1201. [DOI] [PMID: 8879540]
2.	Carballo, J., Martin, R., Bernardo, A. and Gonzalez, J. Purification, characterization and some properties of diacetyl(acetoin) reductase from Enterobacter aerogenes. Eur. J. Biochem. 198 (1991) 327–332. [DOI] [PMID: 2040298]
3.	Ui, S., Okajima, Y., Mimura, A., Kanai, H., Kobayashi, T., Kudo, T. Sequence analysis of the gene for and characterization of D-acetoin forming meso-2,3-butanediol dehydrogenase of Klebsiella pneumoniae expressed in Escherichia coli. J. Ferment. Bioeng. 83 (1997) 32–37.

[EC 1.1.1.304 created 2010 (EC 1.1.1.5 created 1961, modified 1976, part incorporated 2010)]