PMID- 34294316 OWN - NLM STAT- MEDLINE DCOM- 20211108 LR - 20211108 IS - 1879-1344 (Electronic) IS - 0144-8617 (Linking) VI - 269 DP - 2021 Oct 1 TI - Structural characterization and anticoagulant analysis of the novel branched fucosylated glycosaminoglycan from sea cucumber Holothuria nobilis. PG - 118290 LID - S0144-8617(21)00677-9 [pii] LID - 10.1016/j.carbpol.2021.118290 [doi] AB - Glycosaminoglycan HnFG was extracted from sea cucumber Holothuria nobilis. Its chemical structure was characterized by analyzing the physicochemical properties, oligosaccharides from its mild acid hydrolysates and depolymerized products. The disaccharide d-GalNAc(4S6S)-alpha1,2-l-Fuc(3S)-ol found in its mild acid hydrolysates provided a clue for the presence of a unique disaccharide-branch in HnFG. Furthermore, it was confirmed by a series of oligosaccharides from the low-molecular weight HnFG prepared by beta-eliminative depolymerization. Combining with the analysis of its peroxide depolymerized products, the precise structure of HnFG was determined: A chondroitin sulfate E (CS-E)-like backbone branched with sulfated monofucoses (~67%) and disaccharides d-GalNAc(S)-alpha1,2-l-Fuc(3S) (~33%) at O-3 position of each GlcUA. This is the first report on the novel branches in glycosaminoglycan. Biologically, the native and depolymerized HnFG showed potent activities in prolonging the activated partial thrombin time (APTT) and inhibiting intrinsic coagulation Xase (iXase), whereas the oligosaccharides (degree of polymerization