Galactonolactone dehydrogenase
L-galactonolactone dehydrogenase (, galactonolactone dehydrogenase, L-galactono-gamma-lactone dehydrogenase, L-galactono-gamma-lactone:ferricytochrome-c oxidoreductase, GLDHase, GLDase) is an enzyme with systematic name L-galactono-1,4-lactone:ferricytochrome-c oxidoreductase. This enzyme catalyses the following chemical reaction

 (1) L-galactono-1,4-lactone + 2 ferricytochrome c  L-ascorbate + 2 ferrocytochrome c + 2 H+
 (2) L-ascorbate + 2 ferricytochrome c  L-dehydroascorbate +  2 ferrocytochrome c + 2 H+ (spontaneous)

This enzyme catalyses the final step in the biosynthesis of L-ascorbic acid in plants and other photosynthetic eukaryotes.

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EC 1.3.2