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Acidic heteropolysaccharides, d-glucurono-d-xylo-d-mannans were isolated from the water- and alkaline extracts of the fruit body of Tremella fuciformis Berk. Similar polysaccharides were isolated from the growing culture of the haploid cells of two strains (T–19 and T–7) of T. fuciformis, when they were cultured in sucrose or glucose-yeast extract medium. The extracellular polysaccharides contain, d-glucuronic acid, d-xylose and d-mannose [molar ratios, 1.3: 1.0: 3.5 (T–7) and 0.8: 1.0: 2.1 (T–19)], and, in addition, small proportions of l-fucose and O-acetyl groups. Methylation and Smith degradation studies indicated that both fruit body and extracellular polysaccharides are built up of α-(1 → 3)-linked d-mannan backbone chain to which β-linked d-glucuronic acid and single or short chains of β-(1 → 2)-linked d-xylose residues are attached at the C–2 position. l-fucose residues in the extracellular polysaccharides may form the single branches. The structural features of these polysaccharides are discussed...

agricultural and biological chemistry

Comparative structural studies on acidic heteropolysaccharides isolated from "Shirokikurage," fruit body of Tremella fuciformis Berk, and the growing culture of its yeast-like cells.