The Enzyme Database

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Accepted name: 2-methylene-furan-3-one reductase
Reaction: 4-hydroxy-2,5-dimethylfuran-3(2H)-one + NADP+ = 4-hydroxy-5-methyl-2-methylenefuran-3(2H)-one + NADPH + H+
Glossary: furaneol = 4-hydroxy-2,5-dimethylfuran-3(2H)-one
homofuraneol = 2-ethyl-4-hydroxy-5-methylfuran-3(2H)-one
Other name(s): FaEO; SIEO; enone oxidoreductase; 4-hydroxy-2,5-dimethylfuran-3(2H)-one:NAD(P)+ oxidoreductase
Systematic name: 4-hydroxy-2,5-dimethylfuran-3(2H)-one:NADP+ oxidoreductase
Comments: The enzyme was dicovered in strawberry (Fragaria x ananassa), where it produces furaneol, one of the major aroma compounds in the fruits. It has also been detected in tomato (Solanum lycopersicum) and pineapple (Ananas comosus). The enzyme can also act on derivatives substituted at the methylene functional group. The enzyme from the yeast Saccharomyces cerevisiae acts on (2E)-2-ethylidene-4-hydroxy-5-methylfuran-3(2H)-one and produces homofuraneol, an important aroma compound in soy sauce and miso. NADPH is the preferred cofactor.
Links to other databases: BRENDA, EXPASY, Gene, KEGG, MetaCyc, PDB
1.  Raab, T., Lopez-Raez, J.A., Klein, D., Caballero, J.L., Moyano, E., Schwab, W. and Munoz-Blanco, J. FaQR, required for the biosynthesis of the strawberry flavor compound 4-hydroxy-2,5-dimethyl-3(2H)-furanone, encodes an enone oxidoreductase. Plant Cell 18 (2006) 1023–1037. [DOI] [PMID: 16517758]
2.  Klein, D., Fink, B., Arold, B., Eisenreich, W. and Schwab, W. Functional characterization of enone oxidoreductases from strawberry and tomato fruit. J. Agric. Food Chem. 55 (2007) 6705–6711. [DOI] [PMID: 17636940]
3.  Schiefner, A., Sinz, Q., Neumaier, I., Schwab, W. and Skerra, A. Structural basis for the enzymatic formation of the key strawberry flavor compound 4-hydroxy-2,5-dimethyl-3(2H)-furanone. J. Biol. Chem. 288 (2013) 16815–16826. [DOI] [PMID: 23589283]
4.  Uehara, K., Watanabe, J., Mogi, Y. and Tsukioka, Y. Identification and characterization of an enzyme involved in the biosynthesis of the 4-hydroxy-2(or 5)-ethyl-5(or 2)-methyl-3(2H)-furanone in yeast. J. Biosci. Bioeng. 123 (2017) 333–341. [DOI] [PMID: 27865643]
[EC created 2013]

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