L-galactonolactone dehydrogenase EC#: 1.3.2.3; ChemWhat Code: 1374102

Product Name L-galactonolactone dehydrogenase
Example Structure Example Structure of L-galactonolactone dehydrogenase EC#: 1.3.2.3
Synonyms dehydrogenase, galactonolactone, ferricytochrome c oxidoreductase, galactono-1,4-lactone dehydrogenase, galactonolactone dehydrogenase, GALDH, GalL dehydrogenase, GalLDH, GLDase, GLDH, GLDH-A1, GLDH-B1, GLDH-D1, GLDH1, GLDHase, L-galactone-1,4-lactone dehydrogenase, L-galactono-1, 4-lactone dehydrogenase, L-galactono-1,4-lactone dehydrogenase, L-galactono-gamma-lactone dehydrogenase, L-GalLDH, L-GalLDH1, L-GalLDH2, LsL-GalLDH, RrGalLDH
EC Number 1.3.2.3
CAS Registry Number 9029/2/1
Comments This enzyme catalyses the final step in the biosynthesis of L-ascorbic acid in higher plants and in nearly all higher animals with the exception of primates and some birds [5]. The enzyme is very specific for its substrate L-galactono-1,4-lactone as D-galactono-¦Ã-lactone, D-gulono-¦Ã-lactone, L-gulono-¦Ã-lactone, D-erythronic-¦Ã-lactone, D-xylonic-¦Ã-lactone, L-mannono-¦Ã-lactone, D-galactonate, D-glucuronate and D-gluconate are not substrates [5]. FAD, NAD+, NADP+ and O2 (cf. EC 1.3.3.12, L-galactonolactone oxidase) cannot act as electron acceptor [5].
Cofactor
History
Reactions L-galactono-1,4-lactone + 4 ferricytochrome c = L-dehydroascorbate + 4 ferrocytochrome c + 4 H(+).

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