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- W1978187859 abstract "The E. coli K5 capsular polysaccharide is composed of 4)GlcpA(β1–4)GlcpNAc(α1-disaccharide units. A partially N-deacetylated/N-sulfated heptasaccharide, derived from this polymer and having a nonreducing terminal GlcNAc unit, was used as acceptor for a mastocytoma microsomal GlcA-transferase involved in heparin biosynthesis. An octasaccharide with nonreducing-terminal GlcA similarly served as acceptor for the microsomal GlcNAc-transferase. Analysis of the labeled octa- and nona-saccharides formed by transfer of monosaccharide units from UDP-[14C]GlcA and UDP-[3H]GlcNAc, respectively, showed that both glycosyltransferases could utilize partially N-sulfated acceptors. The GlcA-transferase showed a marked preference for a terminal GlcNAc-GlcA-GlcNSO3-sequence, particularly when this sequence was followed by an additional N-sulfated disaccharide unit. Enzymes catalyzing the same GlcA and GlcNAc transfer reactions were solubilized from E. coli K5 membranes. The K5 capsular polysaccharide, like the heparin/heparan sulfate precursor polysaccharide, thus probably grows by stepwise, alternating addition of the two constituent monosaccharide units, from the corresponding UDP-sugars, to the nonreducing ends of the chains. Moreover, the bacterial glycosyl-transferases utilized the same partially N-sulfated oligosaccharide substrates as the mammalian enzymes, and with similar preference for N-sulfate groups in certain positions." @default.
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- W1978187859 date "1994-03-01" @default.
- W1978187859 modified "2023-10-16" @default.
- W1978187859 title "Substrate specificities of glycosyltransferases involved in formation of heparin precursor and E. coli K5 capsular polysaccharides" @default.
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- W1978187859 doi "https://doi.org/10.1016/s0008-6215(00)90972-8" @default.
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