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Information on EC 2.7.7.69 - GDP-L-galactose/GDP-D-glucose: hexose 1-phosphate guanylyltransferase

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IUBMB Comments
This plant enzyme catalyses the conversion of GDP-beta-L-galactose and GDP-alpha-D-glucose to beta-L-galactose 1-phosphate and alpha-D-glucose 1-phosphate, respectively. The enzyme can use inorganic phosphate as the co-substrate, but several hexose 1-phosphates, including alpha-D-mannose 1-phosphate, alpha-D-glucose 1-phosphate, and alpha-D-galactose 1-phosphate, are better guanylyl acceptors. The enzyme's activity on GDP-beta-L-galactose is crucial for the biosynthesis of L-ascorbate.
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The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
Synonyms
GDP-L-galactose phosphorylase, GGP, SlGGP, VTC, Vtc2, Vtc5, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
GDP-alpha-D-glucose + alpha-D-mannose 1-phosphate = alpha-D-glucose 1-phosphate + GDP-alpha-D-mannose
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GDP-beta-L-galactose + alpha-D-mannose 1-phosphate = beta-L-galactose 1-phosphate + GDP-alpha-D-mannose
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(1)
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0
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