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• W1557022910 abstract "The Lewis alpha (1-->3/4)-fucosyltransferase (Le-FucT) is known to fucosylate both Type I (beta Gal(1-->3) beta GlcNAc) and Type II (beta Gal(1-->4) beta GlcNAc) sequences even when these are sialylated at OH-3 or fucosylated at OH-2 of the terminal Gal residues. These acceptor sequences are ubiquitous on mammalian cell-surface glycoproteins and glycolipids. The Le-FucT enzyme is therefore a potential candidate as a universal reagent for the modification of cell surfaces. We have found that a readily accessible, partially purified Le-FucT from human milk, which normally uses GDP-fucose (a 6-deoxy sugar) as the donor for the transfer of a single fucose residue, will also transfer a fucose residue substituted on C-6 by a very large sterically demanding structure, in this instance, a synthetic blood group antigen. As a demonstration of the ability of the Le-FucT to modify glycoconjugates in a mild and specific manner, we chemically synthesized the complex sugar-nucleotide alpha Gal(1-->3) [alpha Fuc(1-->2)]-beta Gal-O-(CH2)8COHN(6)-beta-L-fucose-GDP (13) which is a GDP-fucose analog where the human blood group trisaccharide antigen is covalently linked to C-6 of fucose through an amino group. It is shown that, in enzyme-linked immunosorbent assays, the Le-FucT uses both immobilized beta Gal(1-->3) beta GlcNAc-bovine serum albumin conjugates and fetuin as acceptor substrates and renders them blood group B-active as detected by a monoclonal anti-B blood-grouping antibody. The fucose residue to which the B-trisaccharide is linked therefore becomes covalently attached to the acceptor oligosaccharide chains of those glycoproteins. Incubation of type O erythrocytes with the Le-FucT and complex donor 13 results in the covalent transfer of alpha Gal(1-->3) [alpha Fuc(1-->2)] beta Gal-O-(CH2)8COHN(6)-beta-L-Fuc to cell-surface acceptors since the cells become phenotypically B and are agglutinated by the same antibody. It is proposed that the Le-FucT represents a powerful new tool with the ability to label animal cell surfaces with preassembled oligosaccharide and possibly also other complex recognition markers." @default.
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• W1557022910 date "1992-11-01" @default.
• W1557022910 modified "2023-10-16" @default.
• W1557022910 title "Enzymatic transfer of a preassembled trisaccharide antigen to cell surfaces using a fucosyltransferase." @default.
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• W1557022910 doi "https://doi.org/10.1016/s0021-9258(18)41679-1" @default.
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