Reaction: (1) D-glucopyranose + NADP+ = D-glucono-1,5-lactone + NADPH + H+
(2) D-galactopyranose + NADP+ = D-galactono-1,5-lactone + NADPH + H+
For diagram of reaction click here.
Other name(s): GdhA; dual-specific glucose/galactose dehydrogenase; glucose (galactose) dehydrogenase; glucose/galactose dehydrogenase
Systematic name: D-glucose/D-galactose 1-dehydrogenase (NADPH)
Comments: A zinc protein. The enzyme from the archaeon Picrophilus torridus is involved in glucose and galactose catabolism via the nonphosphorylative variant of the Entner-Doudoroff pathway. It shows 20-fold higher activity with NADP+ compared tor NAD+. The oxidation of D-glucose and D-galactose is catalysed at a comparable rate (cf. EC 1.1.1.119, glucose 1-dehydrogenase (NADP+) and EC 1.1.1.120, galactose 1-dehydrogenase (NADP+)).
Links to other databases: BRENDA, EXPASY, KEGG Metacyc, CAS registry number:
References:
1. Angelov, A., Futterer, O., Valerius, O., Braus, G.H. and Liebl, W. Properties of the recombinant glucose/galactose dehydrogenase from the extreme thermoacidophile, Picrophilus torridus. FEBS J. 272 (2005) 1054-1062. [PMID: 15691337]
2. Milburn, C.C., Lamble, H.J., Theodossis, A., Bull, S.D., Hough, D.W., Danson, M.J. and Taylor, G.L. The structural basis of substrate promiscuity in glucose dehydrogenase from the hyperthermophilic archaeon Sulfolobus solfataricus. J. Biol. Chem. 281 (2006) 14796-14804. [PMID: 16556607]