title: Chondroitinase ABC digestion of dermatan sulphate. N.m.r. spectroscopic characterization of the oligo- and poly-saccharides.
abstract: Dermatan sulphates, in which iduronate was the predominant uronate constituent, were partially digested by chondroitinase ABC to produce oligosaccharides of the following structure: delta UA-[GalNAc(4SO3)-IdoA]mGalNAc(4SO3) [where m = 0-5, delta UA represents beta-D-gluco-4-enepyranosyluronate, IdoA represents alpha-L-iduronate and GalNAc(4SO3) represents 2-acetamido-2-deoxy-beta-D-galactose 4-O-sulphate], which were fractionated by gel-permeation chromatography and examined by 100 MHz 13C-n.m.r. and 400/500 MHz 1H-n.m.r. spectroscopy. Experimental conditions were established for the removal of non-reducing terminal unsaturated uronate residues by treatment with HgCL2, and reducing terminal N-acetylgalactosamine residues of the oligosaccharides were reduced with alkaline borohydride. These modifications were shown by 13C-n.m.r. spectroscopy to have proceeded to completion. Assignments of both 13C-n.m.r. and 1H-n.m.r. resonances are reported for the GalNAc(4SO3)-IdoA repeat sequence in the oligosaccharides as well as for the terminal residues resulting from enzyme digestion and subsequent modifications. A full analysis of a trisaccharide derived from dermatan sulphate led to the amendment of published 13C-n.m.r. chemical-shift assignments for the polymer.
authors.affiliation: Department of Biological Sciences, University of Lancaster, U.K.
authors.forename: P N
authors.initials: PN
authors.lastname: Sanderson
authors.forename: T N
authors.initials: TN
authors.lastname: Huckerby
authors.forename: I A
authors.initials: IA
authors.lastname: Nieduszynski
mesh_terms: D000818:Animals; D002807:Chondroitin / Q000031:analogs & derivatives*; D002808:Chondroitin Lyases / Q000378:metabolism*; D002810:Chondroitinases and Chondroitin Lyases / Q000378:metabolism*; D002850:Chromatography, Gel; D003871:Dermatan Sulfate / Q000378:metabolism*; D009682:Magnetic Resonance Spectroscopy; D009844:Oligosaccharides / Q000378:metabolism; D011134:Polysaccharides / Q000378:metabolism; D013552:Swine
chemical_list: D009844:Oligosaccharides; D011134:Polysaccharides; D003871:Dermatan Sulfate; D002807:Chondroitin; D002808:Chondroitin Lyases; D002810:Chondroitinases and Chondroitin Lyases