Reaction: D-xylose + NADP+ = D-xylono-1,5-lactone + NADPH + H+
Other name(s): D-xylose (nicotinamide adenine dinucleotide phosphate) dehydrogenase (ambiguous); D-xylose-NADP dehydrogenase (ambiguous); D-xylose:NADP+ oxidoreductase (ambiguous); D-xylose 1-dehydrogenase (NADP) (ambiguous)
Systematic name: D-xylose:NADP+ 1-oxidoreductase (D-xylono-1,5-lactone-forming)
Comments: The enzyme, characterized from pig arterial vessels and eye lens, also acts, more slowly, on L-arabinose and D-ribose. cf. EC 1.1.1.424, D-xylose 1-dehydrogenase (NADP+, D-xylono-1,4-lactone-forming).
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 83534-37-6
References:
1. Wissler, J.H. D-Xylose:NADP oxidoreductase of arterial vessels and eye lens: a new enzyme and a final link in ATP-independent cycling of reducing eqivalents in aldose-polyol-ketose interconversion. Hoppe-Seyler's Z. Physiol. Chem. 358 (1977) 1300-1301.
2. Wissler, J.H. Direct spectrophotometric and specific quantitative determination of free and bound D-xylose by analytical application of a new enzyme, D-xylose:NADP-oxidoreductase. Fresenius' Z. Anal. Chem. 290 (1978) 179-180.