title: Fish egg polysialoglycoproteins: structures of new sialooligosaccharide chains isolated from the eggs of Oncorhynchus keta (Walbaum). Fucose-containing units with oligosialyl groups.
abstract: A series of acidic oligosaccharide alditols having different neutral core oligosaccharides were isolated from salmon egg polysialoglycoproteins by alkali-borohydride treatment followed by anion-exchange chromatography and Iatrobead chromatography. Their structures were determined by methylation analysis, molecular secondary ion mass spectrometry of underivatized oligosaccharides, and enzymatic desialylation. The molecular secondary ion mass spectra of intact sialooligosaccharides exhibit pronounced quasi-molecular-ion peaks, (M + H)+, (M + Na)+, (M + 2Na - H)+, and/or (M + K)+, as well as some diagnostic sequence ion peaks. Of a number of oligosaccharide alditols, the following are novel: Fuc alpha 1 leads to 3GalNAc beta l1 leads to 3Gal beta 1 leads to 4Gal beta 1 leads to 3[(leads to 8NeuGc alpha 2)n leads to 6]GalNAcol (n = 1-6). The proton nuclear magnetic resonance spectra of these oligosaccharides are also reported and discussed.
mesh_terms: D000818:Animals; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D005260:Female; D005643:Fucose / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D009844:Oligosaccharides / Q000302:isolation & purification*; D010063:Ovum / Q000032:analysis*; D012474:Salmon; D012795:Sialoglycoproteins / Q000032:analysis*
chemical_list: D009844:Oligosaccharides; D012795:Sialoglycoproteins; D005643:Fucose