Chemical structure of urinary dermatan sulfate excreted by a patient with the hunter syndrome.

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Abstract
The chemical structure of dermatan sulfate (DS) in the urine of a patient with the Hunter syndrome was studied through the analysis of disaccharide units which were derived from the urinary DS by digestion with chondroitinase ABC and separated on a Dowex 1 column. The DS was basically composed of repeating disaccharide units of iduronyl N-acetyl-galactosamine 4-sulfate. About 90% of the excess sulfate were linked to the iduronate residues as an additional sulfate group in the unit. N-Acetyl-galactosamine 6-sulfate and N-acetylgalactosamine 4,6-disulfate residues were minor components. No non-sulfated disaccharide unit was detected in the digestion products. Only sulfoiduronate residue was found as the non-reducing terminal sugar of the DS molecule, consistent with the lack of iduronosulfate sulfatase in this disease.