Uridine diphosphate galactose
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Names | |
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IUPAC name
Uridine 5′-(α-D-galactopyranosyl dihydrogen diphosphate)
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Systematic IUPAC name
O1-{[(2R,3S,4R,5R)-5-(2,4-Dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,4-dihydroxyoxolan-2-yl]methyl} O3-[(2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl] dihydrogen diphosphate | |
Identifiers | |
3D model (
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ChEMBL | |
ChemSpider | |
MeSH | Uridine+diphosphate+galactose |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
C15H24N2O17P2 | |
Molar mass | 566.302 g/mol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Uridine diphosphate galactose (UDP-galactose) is an intermediate in the production of polysaccharides.[1] It is important in nucleotide sugars metabolism, and is the substrate for the transferase B4GALT5.
Sugar metabolism
UDP-Galactose is especially relevant in glycolysis. It is derived from galactose an epimer of glucose, and via the Leloir Pathway, it is used be used as a precursor for the metabolism of glucose into pyruvate.[2] When lactose is hydrolyzed, D-Galactose enters the liver via the bloodstream. There, galactokinase phosphorylates it to galactose-1-phosphate using ATP. This compound then engages in a "ping-pong" reaction with UDP-Glucose, catalyzed by uridylyltransferase, yielding glucose-1-phosphate and UDP-Galactose. This glucose-1-phosphate feeds into glycolysis, while UDP-Galactose undergoes epimerization to regenerate UDP-Glucose.[3]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/65/Galactose_in_glycolysis.svg/220px-Galactose_in_glycolysis.svg.png)
See also
- Galactose
- UDP galactose epimerase
- Uridine diphosphate
References
- PMID 28722986.
- ISBN 978-1-305-57720-6.
- ISBN 978-1-4292-3414-6.