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Uridine diphosphate (UDP)-galactose is relevant in glycolysis. 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.
GalE encodes for an epimerase that converts UDP-glucose into UDP-galactose. This is required for the formation of UDP-galactose for cell wall biosynthesis , in particular the cell wall component lipopolysaccharide, even when cells are not using galactose as a carbon/energy source. [ 4 ]
Uridine diphosphate, abbreviated UDP, is an organic compound. It is an ester of pyrophosphoric acid with the nucleoside uridine . UDP consists of the pyrophosphate group , the pentose sugar ribose , and the nucleobase uracil .
The systematic name of this enzyme class is UDP-galactose:glycoprotein-N-acetyl-D-galactosamine 3-beta-D-galactosyltransferase. This enzyme is also called uridine diphosphogalactose-mucin beta-(1->3)-galactosyltransferase. This enzyme participates in O-glycan biosynthesis and glycan structures - biosynthesis 1.
In galactose metabolism, the enzyme galactose 1-phosphate uridylyltransferase transfers a phosphate from UDP-glucose to galactose 1-phosphate to produce UDP-galactose, which is then converted to UDP-glucose. [15] Bacteria with defective UTP—glucose-1-phosphate uridylyltransferase are unable to incorporate galactose into their cell walls. [16]
Thus, the two substrates of this enzyme are UDP-galactose and lipopolysaccharide, whereas its two products are UDP and [[3-alpha-D-galactosyl-[lipopolysaccharide glucose]]]. This enzyme belongs to the family of glycosyltransferases , specifically the hexosyltransferases.
Thus, the two substrates of this enzyme are UDP-galactose and glycosaminoglycan, whereas its two products are UDP and D-galactosylglycosaminoglycan. This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is UDP-galactose:glycosaminoglycan D-galactosyltransferase.
The systematic name of this enzyme class is UDP-galactose:N-acylsphingosine D-galactosyltransferase. Other names in common use include UDP galactose-N-acylsphingosine galactosyltransferase, and uridine diphosphogalactose-acylsphingosine galactosyltransferase. This enzyme participates in sphingolipid metabolism.