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Two fucosylated chondroitin sulfates from the sea cucumber Eupentacta fraudatrix.
Carbohydrate Polymers 2017 May 16
Two fucosylated chondroitin sulfates EF1 and EF2 were isolated from the sea cucumber Eupentacta fraudatrix. Separation of the polysaccharides was performed using anion-exchange chromatography on DEAE-Sephacel by elution of 0.75M and 1.0M NaCl solutions. The structures of biopolymers were determined by chemical and NMR spectroscopic methods. The backbone of EF1 was found to be composed of chondroitin sulfate A and E units in a ratio of about 1:1. The core of EF2 along with chondroitin sulfate A and E fragments contained unusual disaccharide repeating units →4)-β-d-GlcpA2S3S-(1→3)-β-d-GalpNAc6S-(1→. The main type of branches in both polysaccharides was α-l-Fucp3S4S unit attached to O-3 of GlcA residues. Another type of branches was found to be the disaccharide fragment α-l-Fucp-(1→2)-α-l-Fucp3S4S-(1→ linked to O-3 of GlcA. The presence of structurally different fucosylated chondroitin sulfates in one species of sea cucumber is rather unusual and has not been described previously.
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