Sulfated sialyl-oligosaccharides derived from tracheobronchial mucous glycoproteins of a patient suffering from cystic fibrosis.

Thirteen novel oligosaccharides, each possessing both a sulfate ester and a sialic acid residue, were isolated from tracheobronchial mucous glycoproteins from a patient with cystic fibrosis via cleavage by alkaline borohydride treatment, and by employing immobilized Limulus polyphemus lectin affinity chromatography, SynChroprep AX300 anion-exchange chromatography, Bio-Gel P-2 size-exclusion chromatography, and Hypersil 120A APS-2 high-performance liquid chromatography (HPLC). Proposed structures for the resulting purified sulfated sialyl-oligosaccharides were based on carbohydrate/permethylation analyses, periodate oxidation, complete sequential exoglycosidase digestion, analysis of desulfated products and, analysis by positive-ion fast-atom-bombardment mass spectrometry (FABMS). Sulfate esters on these sialyl-oligosaccharides resided on C-6 of a terminal or an internal D-galactose or 2-acetamido-2-deoxy-D-glucose residue or C-4 of a terminal D-galactose residue. The sialic acid residues were found to be either bound (2-->6)-alpha to 2-acetamido-2-deoxy-D-galactitol or (2-->3)-alpha or (2-->6)-alpha to a D-galactose residue occupying a nonreducing terminus. For this group of oligosaccharides, ranging in size from tri- to hepta-saccharides, it was also observed that a sialic acid residue and a sulfate ester did not residue on the same oligosaccharide branch when more than one branch existed. On linear unbranched sulfated sialyl-oligosaccharides, the sialic acid residue was bound to a D-galactose residue occupying a nonreducing terminus with the sulfate ester residing on an internal D-galactose or a 2-acetamido-2-deoxy-D-glucose residue. These results demonstrate that it is possible for sialic acid and a sulfate ester to exist on the same oligosaccharide and that this oligosaccharide can be as small as a trisaccharide.

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