ID   1.1.1.431
DE   D-xylose reductase (NADPH).
CA   NADP(+) + xylitol = D-xylose + H(+) + NADPH.
CC   -!- Xylose reductases catalyze the reduction of xylose to xylitol,
CC       the initial reaction in the fungal D-xylose degradation pathway.
CC   -!- Most of the enzymes exhibit a strict requirement for NADPH (e.g. the
CC       enzymes from Saccharomyces cerevisiae, Aspergillus niger, Trichoderma
CC       reesei, Candida tropicalis, Saitozyma flava, and Candida intermedia).
CC   -!- Some D-xylose reductases have dual cofactor specificity, though they
CC       still prefer NADPH to NADH (cf. EC 1.1.1.307).
CC   -!- Very rarely the enzyme prefers NADH (cf. EC 1.1.1.430).
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