title: Enzyme-aided construction of medium-sized alditols of complete O-linked saccharides. The constructed hexasaccharide alditol Gal beta 1-4GlcNAc beta 1-6Gal beta 1-4GlcNAc beta 1-6(Gal beta 1-3)GalNAc-ol resists the action of endo-beta-galactosidase from Bacteroides fragilis.
abstract: We have constructed by enzyme-aided in vitro synthesis a hexasaccharide alditol Gal beta 1-4GlcNAc beta 1-6Gal beta 1-4GlcNAc beta 1-6(Gal beta 1-3) GalNAc-ol and shown that it resists the action of endo-beta-galactosidase from Bacteroides fragilis under conditions where a related pentasaccharide alditol, GlcNAc beta 1-3Gal beta 1-4GlcNAc beta 1-6(Gal beta 1-3)GalNAc-ol, was completely cleaved. Together with earlier results from this laboratory, our present data imply that endo-beta-galactosidase from B. fragilis, apparently, can be used to distinguish between GlcNAc beta 1-6Gal and GlcNAc beta 1-3Gal units within linear backbone sequences of all known types of oligo-(N-acetyllactosamino)glycans.
authors.affiliation: Institute of Biotechnology, University of Helsinki, Finland.
authors.forename: H
authors.initials: H
authors.lastname: Maaheimo
authors.forename: L
authors.initials: L
authors.lastname: Penttilä
authors.forename: O
authors.initials: O
authors.lastname: Renkonen
mesh_terms: D001441:Bacteroides fragilis / Q000201:enzymology*; D002240:Carbohydrate Sequence; D006026:Glycoside Hydrolases; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000737:chemistry / Q000378:metabolism*; D013379:Substrate Specificity; D013402:Sugar Alcohols / Q000737:chemistry / Q000378:metabolism*; D001616:beta-Galactosidase / Q000378:metabolism*
chemical_list: D009844:Oligosaccharides; D013402:Sugar Alcohols; D006026:Glycoside Hydrolases; C026093:keratan-sulfate endo-1,4-beta-galactosidase; D001616:beta-Galactosidase