title: The structure of a galactan sulfate from the red seaweed Bostrychia montagnei.
abstract: The sulfated, methylated galactan isolated from the red seaweed Bostrychia montagnei, showed an unusually narrow structural dispersion. This agaran has the defining linear backbone of alternating 3-linked beta-D-galactopyranosyl units and 4-linked alpha-L-galactopyranosyl and 3,6-anhydrogalactopyranosyl residues. The D-units have C-6 methylation, C-6 single stubs of xylopyranosyl and minor to trace amounts of (possible) C-6 linked single stubs of galactopyranosyl. These units are mainly sulfated on C-4 with lesser sulfation at C-6 and minor at C-2. The L-residues are mainly methylated on C-2 of the 3,6-anhydrogalactopyranosyl and sulfated on C-3 of the L-galactopyranosyl; minor amounts of 2,3- and 3,6-disulfated and 2-O-methyl or 2-O-glycosyl 3-sulfated L-galactopyranosyl were also found.
authors.affiliation: Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, PO Box 19046, CEP: 81531-990, Curitiba-Paraná, Brazil.
authors.forename: Maria E R
authors.initials: ME
authors.lastname: Duarte
authors.forename: Miguel D
authors.initials: MD
authors.lastname: Noseda
authors.forename: Marco A
authors.initials: MA
authors.lastname: Cardoso
authors.forename: Siumara
authors.initials: S
authors.lastname: Tulio
authors.forename: Alberto S
authors.initials: AS
authors.lastname: Cerezo
mesh_terms: D005685:Galactans / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D015394:Molecular Structure; D012624:Seaweed / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D005685:Galactans; C046510:galactan polysulfate