title: Structural characterization of a new anticoagulant fucan sulfate from the brown seaweed Ecklonia kurome.
abstract: Methylation analysis of a fucose-containing, sulfated polysaccharide (C-II), which was isolated from the brown seaweed Ecklonia kurome and has a potent anticoagulant activity, showed the presence of 3-O- and 3,4-O-disubstituted fucopyranosyl residues in addition to small proportions of nonreducing, terminal fucofuranosyl and fucopyranosyl groups, and 2,3-di-O- and 2,3,4-tri-O-substituted fucopyranosyl and galactopyranosyl residues with various glycosidic linkages. Methanolysis of C-II gave several neutral oligosaccharide fractions in small proportions and two high-molecular-weight acidic fractions in large proportions. Methylation analysis of the low-sulfated acidic fraction showed that the proportion of 3-O-linked fucosyl residues increases and that of 3,4-O-disubstituted decreased as compared to C-II. Methylation and g.l.c.-m.s. analysis of the neutral oligosaccharide fractions showed the presence of Fuc-(1----3)-Fuc and a fucosyl trisaccharide, in addition to small proportions of Gal-(1----4)-Fuc, Fuc-(1----2)-Fuc, Fuc-(1----4)-Fuc, Fuc-(1----2)-Gal, and Fuc----Gal----Fuc. Methylated C-II was also desulfated by methanolysis, followed by remethylation with (2H3)methyl iodide, and most of (2H3)methyl groups were linked to O-4 of the 3-O-linked fucosyl residues. These results suggested a highly branched, new type of fucan sulfate containing a backbone of (1----3)-linked L-fucosyl residues having sulfate groups mainly attached to C-4.
authors.affiliation: Department of Biophysics, School of Hygienic Sciences, Kitasato University, Kanagawa, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nishino
authors.forename: T
authors.initials: T
authors.lastname: Nagumo
authors.forename: H
authors.initials: H
authors.lastname: Kiyohara
authors.forename: H
authors.initials: H
authors.lastname: Yamada
mesh_terms: D000925:Anticoagulants / Q000737:chemistry*; D002240:Carbohydrate Sequence; D008401:Gas Chromatography-Mass Spectrometry; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000032:analysis; D000459:Phaeophyceae / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry* / Q000494:pharmacology; D012624:Seaweed / Q000737:chemistry*
chemical_list: D000925:Anticoagulants; D009844:Oligosaccharides; D011134:Polysaccharides; C007789:fucoidan