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. 1972 Aug;51(8):2024–2032. doi: 10.1172/JCI107008

Glycosyltransferases in human blood

I. Galactosyltransferase in human serum and erythrocyte membranes

Young S Kim 1,2, Jose Perdomo 1,2, James S Whitehead 1,2
PMCID: PMC292358  PMID: 5054461

Abstract

Human serum and hemoglobin-free erythrocyte membranes were found to contain a galactosyltransferase which catalyzes the transfer of galactose from UDP-galactose to specific large and small molecular weight acceptors. The requirements for enzyme activity were found to be similar for the enzymes from both sources. However, the membrane-bound enzyme depended on a detergent for maximal activity. Mn++ was an absolute requirement for transfer and uridine nucleoside phosphates were inhibitors. The most effective acceptor for galactose was a glycoprotein containing N-acetylglucosamine residues in the terminal position of its oligosaccharide side chains, N-acetylglucosamine was also an acceptor. While the presence of α-lactalbumin in the incubation medium resulted in a significant decrease in the transfer of galactose to N-acetylglucosamine, glucose, which was not an acceptor for galactose in the absence of α-lactalbumin, became an excellent acceptor. The serum enzyme catalyzed the transfer of 54 nmoles of galactose per milliliter of serum per hour and its apparent Km for UDP-galactose was 7.5 × 10-6M. The membrane enzyme had a similar apparent Km. Using a quantitative assay system the enzyme was found to be present in all individuals studied, regardless of their blood type, secretor status, or sex.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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