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• W1528778858 abstract "A UDP-Gal:N-acetyllactosaminide alpha (1,3)-galactosyltransferase from Ehrlich ascites tumor cells has been purified over 200,000-fold to apparent electrophoretic homogeneity. The purified enzyme transfers D-galactosyl groups from UDP-Gal to beta-D-Gal-(1,4)-D-GlcNAc in alpha-linkage. The apparent Km values for donor and acceptor substrates are 12.6 microM and 1.15 mM, respectively. The trisaccharides beta-D-Gal(1,4)-beta-D-GlcNAc(1,2)- or (1,6)-D-Man exhibit a Km 5-fold lower than that of N-acetyllactosamine, and an even more pronounced effect is observed with the biantennary pentasaccharide beta-D-Gal(1,4)-beta-D-GlcNAc(1,2)-[beta-D-Gal(1, 4)-beta-D-GlcNAc-(1,6)]-D-Man (Km 0.10 mM). The transferase shows a single band on sodium dodecyl sulfate-polyacrylamide gel electrophoresis under reducing conditions with an apparent subunit molecular weight of 80,000, exhibits a pH optimum at 6.2, and requires Mn2+ ions and detergent for enzymatic activity. Specificity studies using immobilized oligosaccharides show that the minimum acceptor structure for the alpha-galactosyltransferase is N-acetyllactosamine. The narrow specificity of the alpha-galactosyltransferase is indicated by the fact that lactose, beta-D-Gal(1,3)-D-GlcNAc, and beta-D-Gal(1,4)-[alpha-L-Fuc(1,3)]-D-GlcNAc are very poor acceptors. The enzyme differs from the blood-group B-specified galactosyltransferase in that the sequence alpha-L-Fuc(1,2)-beta-D-Gal(1,4)-D-GlcNAc is not an acceptor. Oligosaccharides, glycoproteins, glycolipids, and glycosaminoglycans containing the terminal nonreducing N-acetyllactosamine unit all serve as acceptors for the enzyme." @default.
• W1528778858 created "2016-06-24" @default.
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• W1528778858 date "1986-05-01" @default.
• W1528778858 modified "2023-09-28" @default.
• W1528778858 title "Purification and characterization of a UDP-Gal:beta-D-Gal(1,4)-D-GlcNAc alpha(1,3)-galactosyltransferase from Ehrlich ascites tumor cells." @default.
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• W1528778858 doi "https://doi.org/10.1016/s0021-9258(17)38493-4" @default.
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