title: Structural studies of the asparagine-linked sugar chains of two immunoglobulin M's purified from a patient with Waldenström's macroglobulinemia.
abstract: The structures of the sugar chains present in two human monoclonal IgM molecules purified from the serum of a patient with Waldenström's macroglobulinemia have been determined. The asparagine-linked sugar chains were liberated as oligosaccharides by hydrazinolysis and labeled by reduction with NaB3H4 after N-acetylation. Their structures were studied by serial lectin column chromatography and sequential exoglycosidase digestion in combination with methylation analysis. These two IgM's were shown to contain almost the same sugar chains. The sugar chains were a mixture of a series of high-mannose-type and biantennary complex-type oligosaccharides. The complex-type oligosaccharides contain Man alpha 1----6(+/- GlcNAc beta 1----4)(Man alpha 1----3)Man beta 1----4GlcNAc beta 1----4(Fuc alpha 1----6)GlcNAc as their core and GlcNAc beta 1----, Gal beta 1----4GlcNAc beta 1---- and Neu5Ac alpha 2----6Gal beta 1----4GlcNAc beta 1---- groups in their outer chain moieties.
authors.affiliation: Department of Biochemistry, University of Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Ohbayashi
authors.forename: T
authors.initials: T
authors.lastname: Endo
authors.forename: E
authors.initials: E
authors.lastname: Mihaesco
authors.forename: M G
authors.initials: MG
authors.lastname: Gonzales
authors.forename: N
authors.initials: N
authors.lastname: Kochibe
authors.forename: A
authors.initials: A
authors.lastname: Kobata
mesh_terms: D001216:Asparagine; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D004587:Electrophoresis, Agar Gel; D004590:Electrophoresis, Paper; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000302:isolation & purification; D007147:Immunoglobulin Light Chains / Q000302:isolation & purification; D007075:Immunoglobulin M / Q000302:isolation & purification; D008745:Methylation; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000302:isolation & purification*; D008258:Waldenstrom Macroglobulinemia / Q000276:immunology*
chemical_list: D007143:Immunoglobulin Heavy Chains; D007147:Immunoglobulin Light Chains; D007075:Immunoglobulin M; D009844:Oligosaccharides; D001216:Asparagine