Accepted name: 2′-hydroxydaidzein reductase
Reaction: 2′-hydroxy-2,3-dihydrodaidzein + NADP+ = 2′-hydroxydaidzein + NADPH + H+
Other name(s): NADPH:2′-hydroxydaidzein oxidoreductase; HDR; 2′-hydroxydihydrodaidzein:NADP+ 2′-oxidoreductase
Systematic name: 2′-hydroxy-2,3-dihydrodaidzein:NADP+ 2′-oxidoreductase
Comments: In the reverse reaction, the 2′-hydroxyisoflavone (2′-hydroxydaidzein) is reduced to an isoflavanone. Also acts on 2′-hydroxyformononetin and to a small extent on 2′-hydroxygenistein. Involved in the biosynthesis of the phytoalexin glyceollin. The isoflavones biochanin A, daidzein and genestein as well as the flavonoids apigenin, kaempferol and quercetin do not act as substrates.
1.  Fischer, D., Ebenau-Jehle, C. and Grisebach, H. Phytoalexin synthesis in soybean: purification and characterization of NADPH:2′-hydroxydaidzein oxidoreductase from elicitor-challenged soybean cell cultures. Arch. Biochem. Biophys. 276 (1990) 390–395. [PMID: 2306102]
[EC created 1992, modified 2004]

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