4.2.1.93: ATP-dependent NAD(P)H-hydrate dehydratase

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Reaction

Synonyms

(S)-NAD(P)HX dehydratase, ADP-dependent (S)-NAD(P)H-hydrate dehydratase, ADP/ATP-dependent NAD(P)H-hydrate dehydratase, At5g19150, ATP-dependent H4NAD(P)OH dehydratase, ATP-dependent NNRD, BSU38720, Carkd, More, NAD(P)H-hydrate dehydratase, NAD(P)HX dehydratase, NAD(P)X dehydratase, NAXD, NNRD, reduced nicotinamide adenine dinucleotide hydrate dehydratase, YKL151C, YxkO

ECTree

     4 Lyases

         4.2 Carbon-oxygen lyases

             4.2.1 Hydro-lyases

                4.2.1.93 ATP-dependent NAD(P)H-hydrate dehydratase

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3761	AA Sequence
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37	General Information
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23	Source Tissue
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Systematic Name

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Systematic Name on EC 4.2.1.93 - ATP-dependent NAD(P)H-hydrate dehydratase

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SYSTEMATIC NAME

IUBMB Comments

(6S)-6beta-hydroxy-1,4,5,6-tetrahydronicotinamide-adenine-dinucleotide hydro-lyase (ATP-hydrolysing; NADH-forming)

Acts equally well on hydrated NADH and hydrated NADPH. NAD(P)H spontaneously hydrates to both the (6S)- and (6R)- isomers, and these are interconverted by EC 5.1.99.6, NAD(P)H-hydrate epimerase, to a 60:40 ratio [4]. Hence EC 4.2.1.93 together with EC 5.1.99.6 can restore the mixture of hydrates into NAD(P)H [3,4]. The enzyme from eukaryotes has no activity with ADP, contrary to the enzyme from bacteria (cf. EC 4.2.1.136, ADP-dependent NAD(P)H-hydrate dehydratase) [4].