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- W1567337175 abstract "Abstract An N-acetylglucosaminyltransferase has been partially purified from Novikoff tumor cell ascites fluid by affinity chromatography on concanavalin A-Sepharose. The enzyme was obtained in a highly concentrated form after lyophilization. The enzyme appeared to be highly specific for acceptor oligosaccharides and glycoproteins carrying a terminal Gal beta 1----4GlcNAc beta 1----R unit. Characterization of products formed by the enzyme in vitro by methylation analysis and 1H NMR spectroscopy revealed that the enzyme catalyzed the formation of a GlcNAc beta 1----3Gal beta 1----4GlcNAc beta-R sequence. The enzyme therefore could be described as an UDP-GlcNAc:Gal beta 1----4GlcNAc beta-R beta 1----3-N-acetylglucosaminyltransferase. Acceptor specificity studies with oligosaccharides that form part of N-glycans revealed that the presence of a Gal beta 1----4GlcNAc beta 1----2(Gal beta 1----4GlcNAc beta 1----6)Man pentasaccharide in the acceptor structure is a requirement for optimal activity. Studies on the branch specificity of the enzyme showed that the branches of this pentasaccharide structure, when contained in tri- and tetraantennary oligosaccharides, are highly preferred over other branches for attachment of the 1st and 2nd mol of GlcNAc into the acceptor molecule. The enzyme also showed activity toward oligosaccharides related to blood group I- and i-active polylactosaminoglycans. In addition the enzyme together with calf thymus UDP-Gal:GlcNAc beta-R beta 1----4-galactosyltransferase was capable of catalyzing the synthesis of a series of oligomers of N-acetyllactosamine. Competition studies revealed that all acceptors were acted upon by a single enzyme species. It is concluded that the N-acetylglucosaminyltransferase functions in both the initiation and the elongation of polylactosaminoglycan chains of N-glycoproteins and possibly other glycoconjugates." @default.
- W1567337175 created "2016-06-24" @default.
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- W1567337175 date "1988-09-01" @default.
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- W1567337175 title "Biosynthesis of blood group i-active polylactosaminoglycans. Partial purification and properties of an UDP-GlcNAc:N-acetyllactosaminide beta 1—-3-N-acetylglucosaminyltransferase from Novikoff tumor cell ascites fluid." @default.
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- W1567337175 doi "https://doi.org/10.1016/s0021-9258(18)37777-9" @default.
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