NAD(P)H-hydrate epimerase (, NAD(P)HX epimerase) is an enzyme with systematic name (6R)-6beta-hydroxy-1,4,5,6-tetrahydronicotinamide-adenine dinucleotide 6-epimerase. This enzyme catalyses the following chemical reaction
(1) (6R)-6beta-hydroxy-1,4,5,6-tetrahydronicotinamide-adenine dinucleotide (6S)-6beta-hydroxy-1,4,5,6-tetrahydronicotinamide-adenine dinucleotide
(2) (6R)-6beta-hydroxy-1,4,5,6-tetrahydronicotinamide-adenine dinucleotide phosphate (6S)-6beta-hydroxy-1,4,5,6-tetrahydronicotinamide-adenine dinucleotide phosphate
The enzyme can use either (R)-NADH-hydrate or (R)-NADPH-hydrate as a substrate.
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