title: Chemo-enzymatic synthesis of a tetra- and octasaccharide fragment of the capsular polysaccharide of Streptococcus pneumoniae type 14.
abstract: The chemo-enzymatic synthesis is described of tetrasaccharide beta-D-Galp-(1-->4)-beta-D-Glcp-(1-->6)-[beta-D-Galp-(1-->4)]-beta-D-GlcpNAc-(1-->O(CH(2))(6)NH(2) (1) and octasaccharide beta-D-Galp-(1-->4)-beta-D-Glcp-(1-->6)-[beta-D-Galp-(1-->4)]-beta-D-GlcpNAc-(1-->3)-beta-D-Galp-(1-->4)-beta-D-Glcp-(1-->6)-[beta-D-Galp-(1-->4)]-beta-D-GlcpNAc-(1-->O(CH(2))(6)NH(2) (2), representing one and two tetrasaccharide repeating units of Streptococcus pneumoniae serotype 14 capsular polysaccharide. In a chemical approach, the intermediate linear trisaccharide 3 and hexasaccharide 4 were synthesized. Galactose residues were beta-(1-->4)-connected to the internal N-acetyl-beta-D-glucosamine residues by using bovine milk beta-1,4-galactosyltransferase. Both title oligosaccharides will be conjugated to carrier proteins to be tested as potential vaccines in animal models.
authors.affiliation: Bijvoet Center, Department of Bio-Organic Chemistry, Section of Glycoscience and Biocatalysis, Utrecht University, Padualaan 8, NL-3584 CH Utrecht, The Netherlands.
authors.forename: John A F
authors.initials: JA
authors.lastname: Joosten
authors.forename: Johannis P
authors.initials: JP
authors.lastname: Kamerling
authors.forename: Johannes F G
authors.initials: JF
authors.lastname: Vliegenthart
mesh_terms: D000818:Animals; D002240:Carbohydrate Sequence; D002241:Carbohydrates / Q000737:chemistry; D002417:Cattle; D005944:Glucosamine / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D009237:N-Acetyllactosamine Synthase / Q000378:metabolism; D011134:Polysaccharides / Q000138:chemical synthesis; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D013296:Streptococcus pneumoniae / Q000378:metabolism*; D013696:Temperature
chemical_list: D002241:Carbohydrates; D011134:Polysaccharides; D011135:Polysaccharides, Bacterial; D009237:N-Acetyllactosamine Synthase; D005944:Glucosamine