Characteristics of fucose-containing polysaccharides from submerged fermentation of Agaricus blazei Murill   全文下載

Characteristics of fucose-containing polysaccharides from submerged fermentation of Agaricus blazei Murill

Fucose is one of important residues of recognition pattern for many immune cells. In this study, we characterized bioactive fucose-containing acidic polysaccharides from submerged fermentation of Agaricus blazei Murill. We obtained the polysaccharides through a cell-based activity-guided strategy, and used carbohydrate recognition monoclonal antibodies based Enzyme-Linked Immuno Sorbent Assay (ELISA) along with methylation and NMR analyses to investigate the structural characteristics of the polysaccharides. The polysaccharides had Mw of 3.5 * 105 Da. The major sugars were L-fucose, L-arabinose, Dgalactose, D-xylose, and D-galacturonic acid in the molar ratio of 6.4, 15.5, 28.5, 14.7, and 25.0% with a small amount of D-glucose, D-mannose, L-rhamnose, and D-glucuronic acid. Results indicated that the bioactive polysaccharides consisted of a (1,4)-Galp and (1,4)- GalAp back bone; (1,2)-Xyl and (1,2)-Rha might also comprise backbone or constitute side chain; linkage (1,5)-Ara and terminal fucosyl residues were also involved in the polysaccharides. Regarding bioactivity, removal of the terminal L-fucosyl residues reduced the TNF-a cytokine stimulating activity of the polysaccharides in a RAW 264.7 macrophage cell-line test, whereas NF-kB and TLR4 affected the polysaccharide-induced TNF-a production.