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Last Updated: 2018-12-22
The pathway starts with the isomerization of Beta-D-galactose into Alpha-D-galactose through a galactose mutarotase. Alpha-D-galactose is then phosphorylated through an ATP dependent galactokinase resulting in the release of ADP, a hydrogen ion and alpha-D-galactose 1-phosphate. The latter compound reacts with UDP glucose which is the result of UTP reacting with alpha-D-glucose through a uridinephosphoglucose pyrophosphorylase. The reaction between alpha-D-galactose 1-phosphate and UDP glucose results in the release of glucose 1-phosphate and UDP-alpha-D-galactose. Glucose 1-phosphate can be further isomerized into glucose 6-phosphate, while UDP-alpha-D-galactose can be reverted into UDP glucose through a UDP-epimerase.
Leloir Pathway References
Majumdar S, Ghatak J, Mukherji S, Bhattacharjee H, Bhaduri A: UDPgalactose 4-epimerase from Saccharomyces cerevisiae. A bifunctional enzyme with aldose 1-epimerase activity. Eur J Biochem. 2004 Feb;271(4):753-9.Pubmed: 14764091
Frey PA: The Leloir pathway: a mechanistic imperative for three enzymes to change the stereochemical configuration of a single carbon in galactose. FASEB J. 1996 Mar;10(4):461-70.Pubmed: 8647345
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