A spacer-modified disaccharide as a photoaffinity reagent for the acceptor-binding area of bovine (1 → 4)-β-d-galactosyltransferase: comparison of its acceptor properties with those of other 2-acetamido-2-deoxy-β-d-glucopyranosides
摘要:
The spacer-modified disaccharide 1,10-di-O-(2-acetamido-2-deoxy-beta-D-glucopyranosyl)-2-azi-1,10-decanediol (10) that mimics the biantennary. core heptasaccharide of N-glycoproteins has been synthesised. Compound 10 is an excellent acceptor in galactosyltransferase-catalysed galactosylation by UDP-galactose, is superior (7-8-fold) to analogues that have only one GlcNAc unit, and is an efficient photoaffinity reagent for galactosyltransferase. In the presence of UDP-Gal. no photoaffinity labelling by 10 takes place, which agrees the mechanism of galactosyltransferase action.
The convergent synthesis of tetra- and penta-saccharide fragments of the TACA dimeric Lex is described. The synthetic strategy relied on the preparation of a protected GlcNTCA-(1,3)-Gal-(1,4)-GlcNAc trisaccharide diol free at O-3 of both glucosamine residues. Key steps in the preparation of this diol involved glycosylation at O-4 of N-acetylglucosamine using activation of a trichloroacetimidate with
A spacer-modified disaccharide as a photoaffinity reagent for the acceptor-binding area of bovine (1 → 4)-β-d-galactosyltransferase: comparison of its acceptor properties with those of other 2-acetamido-2-deoxy-β-d-glucopyranosides
作者:Sándor-Csaba Áts、Jochen Lehmann、Stefan Petry
DOI:10.1016/s0008-6215(00)90925-x
日期:1992.9
The spacer-modified disaccharide 1,10-di-O-(2-acetamido-2-deoxy-beta-D-glucopyranosyl)-2-azi-1,10-decanediol (10) that mimics the biantennary. core heptasaccharide of N-glycoproteins has been synthesised. Compound 10 is an excellent acceptor in galactosyltransferase-catalysed galactosylation by UDP-galactose, is superior (7-8-fold) to analogues that have only one GlcNAc unit, and is an efficient photoaffinity reagent for galactosyltransferase. In the presence of UDP-Gal. no photoaffinity labelling by 10 takes place, which agrees the mechanism of galactosyltransferase action.