Polysaccharides in Fungi. IV. Acidic Oligosaccharides from Acidic Heteroglycans of Tremella fuciformis BERK and Detailed Structures of the Polysaccharides

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The acidic heteroglycans (AC and BC) prepared from the fruit bodies of Tremella fuciformis BERK have been partially hydrolyzed with 1 N sulfuric acid to isolate three kinds of acidic oligosaccharides (H-1,H-2 and H-3). On the basis of methylation analysis and PMR spectroscopy, the structures of these compounds were established to be O-(β-D-glucopyranosyluronic acid)-(1→2)-O-α-D-mannopyranosyl-(1→3)-O-α-D-mannopyranosyl-(1→3)-D-mannopyranose for H-1,O-(β-D-glucopyranosyluronic acid)-(1→2)-O-α-D-mannopyranosyl-(1→3)-D-mannopyranose for H-2,and 2-O-(β-D-glucopyranosyl uronic acid)-D-mannopyranose for H-3. The chemical and physical properties of H-3 were identical with those reported for the aldobiouronic acid prepared from the extracellular polysaccharides of T. mesenterica and other sources. These results indicate that the anomeric configuration of the non-reduced terminal D-glucopyranosyluronic acid residues of the acidic polysaccharides, AC and BC, is of β-type, and that the configuration of internal D-mannopyranose residues is of α-type. The present study also confirms that β-D-glucopyranosyluronic acid residues are linked to the position 2 of α-1→3 D-mannopyranose units in both AC and BC.
公益社団法人日本薬学会の論文
1978-12-25