Two fucosylated chondroitin sulfates from the sea cucumber Eupentacta fraudatrix.
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.
N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow 119991, Russia. Electronic address: ustnad@gmail.com.
Nadezhda E
NE
Ustyuzhanina
N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow 119991, Russia.
Maria I
MI
Bilan
N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow 119991, Russia.
Andrey S
AS
Dmitrenok
N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow 119991, Russia.
Nikolay E
NE
Nifantiev
N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow 119991, Russia. Electronic address: usov@ioc.ac.ru.
Anatolii I
AI
Usov
D000818:Animals; D002809:Chondroitin Sulfates / Q000737:chemistry* / Q000302:isolation & purification; D004187:Disaccharides / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D012616:Sea Cucumbers / Q000737:chemistry*
D004187:Disaccharides; C517150:fucosylated chondroitin sulfate; D002809:Chondroitin Sulfates
Anion-exchange chromatography; Eupentacta fraudatrix; Fucosylated chondroitin sulfate; NMR; Sea cucumber