The structure of a galactan sulfate from the red seaweed Bostrychia montagnei |
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Authors: | Duarte Maria E R Noseda Miguel D Cardoso Marco A Tulio Siumara Cerezo Alberto S |
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Institution: | Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, PO Box 19046, CEP: 81531-990, Curitiba-Paraná, Brazil. |
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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. |
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Keywords: | Sulfated galactans Chemical structure Methylation analysis NMR spectroscopy Seaweed Bostrychia montagnei Rhodomelaceae |
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