L-galactonolactone dehydrogenase (, ''galactonolactone dehydrogenase'', ''L-galactono-gamma-lactone dehydrogenase'', ''L-galactono-gamma-lactone:ferricytochrome-c oxidoreductase'', ''GLDHase'', ''GLDase'') is an
enzyme
Enzymes () are proteins that act as biological catalysts by accelerating chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products. A ...
with
systematic name A systematic name is a name given in a systematic way to one unique group, organism, object or chemical substance, out of a specific population or collection. Systematic names are usually part of a nomenclature.
A semisystematic name or semitrivial ...
''L-galactono-1,4-lactone:ferricytochrome-c oxidoreductase''. This enzyme
catalyses the following
chemical reaction
A chemical reaction is a process that leads to the IUPAC nomenclature for organic transformations, chemical transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the pos ...
: (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
plant
Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclud ...
s and other photosynthetic eukaryotes.
References
External links
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EC 1.3.2