Isolation and some structural analyses of a proteodermatan sulphate from calf skin.
A proteodermatan sulphate was isolated from 0.15 M-NaCl and 0.45 M-NaCl extracts of newborn-calf skin. The proteoglycan was separated from collagen and hyaluronic acid by precipitation with cetylpyridinium chloride and CsCl-density-gradient centrifugation. Further purification was performed by ion-exchange, affinity and molecular-sieve chromatography. The proteoglycan bound to concanavalin A-Sepharose in 1 M-NaCl. It gave a positive reaction with periodic acid/Schiff reagent and contained 8.3% of uronic acid. The dermatan sulphate, the only glycosaminoglycan component, was composed of 74% iduronosylhexosamine units and 26% glucuronosylhexosamine units. The Mr was assessed to be 15000-20000 by gel chromatography. The core protein was found to be a sialoglycoprotein that had O-glycosidic oligosaccharides with N-acetylgalactosamine at the reducing termini. The molar ratio of oligosaccharide chains to dermatan sulphate was approx. 3:1. From these results the proposed structure of proteodermatan sulphate is: one dermatan sulphate chain (average Mr 17500), three O-glycosidic oligosaccharide chains and probably N-glycosidic oligosaccharide chain(s) bound to one core-protein molecule (Mr 55000).
D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002417:Cattle; D055598:Chemical Phenomena; D002621:Chemistry; D002807:Chondroitin / Q000031:analogs & derivatives*; D002846:Chromatography, Affinity; D002852:Chromatography, Ion Exchange; D003871:Dermatan Sulfate / Q000031:analogs & derivatives* / Q000302:isolation & purification; D004588:Electrophoresis, Cellulose Acetate; D004591:Electrophoresis, Polyacrylamide Gel; D011509:Proteoglycans / Q000302:isolation & purification*; D012867:Skin / Q000032:analysis*
D000596:Amino Acids; D011509:Proteoglycans; C028774:proteodermatan sulfate; D003871:Dermatan Sulfate; D002807:Chondroitin