title: A unified strategy for the synthesis of mucin cores 1-4 saccharides and the assembled multivalent glycopeptides.
abstract: By displaying different O-glycans in a multivalent mode, mucin and mucin-like glycoproteins are involved in a plethora of protein binding events. The understanding of the roles of the glycans and the identification of potential glycan binding proteins are major challenges. To enable future binding studies of mucin glycan and glycopeptide probes, a method that gives flexible and efficient access to all common mucin core-glycosylated amino acids was developed. Based on a convergent synthesis strategy starting from a shared early stage intermediate by differentiation in the glycoside acceptor reactivity, a common disaccharide building block allows for the creation of extended glycosylated amino acids carrying the mucin type-2 cores 1-4 saccharides. Formation of a phenyl-sulfenyl-N-Troc (Troc=trichloroethoxycarbonyl) byproduct during N-iodosuccinimide-promoted thioglycoside couplings was further characterized and a new methodology for the removal of the Troc group is described. The obtained glycosylated 9-fluorenylmethoxycarbonyl (Fmoc)-protected amino acid building blocks are incorporated into peptides for multivalent glycan display.
authors.affiliation: Gesellschaft zur Förderung der Analytischen, Wissenschaften e.V. ISAS-Leibniz, Institute for Analytical Sciences, Otto-Hahn-Strasse 6b, 44227 Dortmund (Germany), Fax: (+49) 231-1392-4850.
authors.forename: Christian
authors.initials: C
authors.lastname: Pett
authors.forename: Manuel
authors.initials: M
authors.lastname: Schorlemer
authors.forename: Ulrika
authors.initials: U
authors.lastname: Westerlind
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000138:chemical synthesis* / Q000737:chemistry*; D002241:Carbohydrates / Q000138:chemical synthesis* / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D006020:Glycopeptides / Q000138:chemical synthesis* / Q000737:chemistry; D006031:Glycosylation; D015394:Molecular Structure; D009077:Mucins / Q000138:chemical synthesis* / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry*
chemical_list: D000596:Amino Acids; D002241:Carbohydrates; D006020:Glycopeptides; D009077:Mucins; D010455:Peptides; D011134:Polysaccharides
keywords: amino acids; carbohydrates; glycopeptides; glycosylation; reactivity