Uridine diphosphate galactose

Uridine diphosphate galactose (UDP-galactose) is an intermediate in the production of polysaccharides.

UDP-galactose is the activated form of Gal, a crucial monosaccharide building block for human milk oligosaccharide (HMO).

[2] The activated form of galactose (Gal) serves as a donor molecule involved in catalyzing the conversion of UDP-galactose to UDP-glucose.

The conversion is a rate-limiting step essential to the pace of UDP-glucose production that determines the completion of glycosylation reactions.

This compound then engages in a "ping-pong" reaction with UDP-glucose, catalyzed by uridylyltransferase, yielding glucose-1-phosphate and UDP-galactose.

transforming galactose (1) to glucose for the glycolysis. Galactose-1-phosphate (2), UDP-glucose (3), UDP-galactose (4) ; Glucose 1-phosphate (5); Glucose 6-phosphate (6). Galactokinase (GK), Galactose-1-phosphate uridylyltransferase (GALT), UDP-glucose 4-epimerase (UGE), phosphoglucomutase (PGM)