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. 1968 May;107(5):637–644. doi: 10.1042/bj1070637

The metabolism of d-galactosamine and N-acetyl-d-galactosamine in rat liver

Frank Maley 1, Anthony L Tarentino 1, John F McGarrahan 1,*, Rudolph DelGiacco 1,*
PMCID: PMC1198715  PMID: 16742584

Abstract

d-[1-14C]Galactosamine appears to be utilized mainly by the pathway of galactose metabolism in rat liver, as evidenced by the products isolated from the acid-soluble fraction of perfused rat liver. These products were eluted in the following order from a Dowex 1 (formate form) column and were characterized as galactosamine 1-phosphate, sialic acid, UDP-glucosamine, UDP-galactosamine, N-acetylgalactosamine 1-phosphate, N-acetylglucosamine 6-phosphate, UDP-N-acetylglucosamine, UDP-N-acetylgalactosamine and an unidentified galactosamine-containing compound. In addition, [1-14C]glucosamine was found in the glycogen, an incorporation previously shown to result from the substitution of UDP-glucosamine for UDP-glucose in the glycogen synthetase reaction. Analysis of the [1-14C]glucosamine-containing disaccharides released from glycogen by β-amylase provided additional evidence that they consist of a mixture of glucose and glucosamine in a 1:1 ratio, but with glucose predominating on the reducing end. UDP-N-acetylgalactosamine was shown to result from the reaction of UTP with N-acetylgalactosamine 1-phosphate in the presence of a rat liver extract.

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Selected References

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