title: Structures of sugar chains of hen egg yolk riboflavin-binding protein.
abstract: The structures of the sugar chains of hen yolk riboflavin-binding protein (RBP) were established. Asparagine-linked sugar chains of yolk-RBP were liberated by hydrazinolysis. Free amino groups of the sugar chains were acetylated and the reducing-end sugar residues were tagged with 2-aminopyridine. Fluorescent pyridylamino (PA-) derivatives of the sugar chains were purified by gel-filtration and reversed-phase HPLC. Seven PA-sugar chains were isolated, and the structure of each was determined by composition analysis, sequential exoglycosidase digestion, methylation analysis, and 500-mHz 1H-NMR spectroscopy. These analyses showed that the main sugar chains had sialylbiantenna and sialyltriantenna structures. PA-sugar chains of plasma-RBP were also isolated, and the structures of the PA-sugar chains of yolk- and plasma-RBPs were compared as to their elution patterns on anion-exchange chromatography and reversed-phase HPLC. The plasma RBP had almost the same sugar chains as the yolk RBP did, indicating that sugar chains are not modified during incorporation into the oocyte.
authors.affiliation: Department of Chemistry, Osaka University College of Science.
authors.forename: M
authors.initials: M
authors.lastname: Tarutani
authors.forename: N
authors.initials: N
authors.lastname: Norioka
authors.forename: T
authors.initials: T
authors.lastname: Mega
authors.forename: S
authors.initials: S
authors.lastname: Hase
authors.forename: T
authors.initials: T
authors.lastname: Ikenaka
mesh_terms: D000818:Animals; D002240:Carbohydrate Sequence; D002241:Carbohydrates / Q000737:chemistry*; D002352:Carrier Proteins / Q000737:chemistry*; D002645:Chickens; D004530:Egg Yolk / Q000737:chemistry; D005260:Female; D006031:Glycosylation; D009682:Magnetic Resonance Spectroscopy; D026901:Membrane Transport Proteins; D008969:Molecular Sequence Data; D015394:Molecular Structure; D012256:Riboflavin / Q000378:metabolism
chemical_list: D002241:Carbohydrates; D002352:Carrier Proteins; D026901:Membrane Transport Proteins; C019079:riboflavin-binding protein; D012256:Riboflavin