Glycobiology vol 3 no 6 pp. 633-641, 1993
© 1993
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Structurefunction studies on selectin carbohydrate ligands. Modifications to fucose, sialic acid and sulphate as a sialic acid replacement
Glycomed, Inc., 860 Atlantic Avenue Alameda, CA 94501, USA
1Alberta Research Council, Edmonton, Alberta T6H 5X2, Canada
2Department of Bioorganic Chemistry, Gifu University Gifu, 501-11, Japan
The selectins are a family of carbohydrate-binding proteins that have been implicated in the initial interaction between leukocytes and the vascular endothelium. The three members of this family will bind to the sialyl-Lewisx epitope [Sia
23 Gal ß14 (Fuc
13) GlcNAc] and related oligosaccharides. In this report, we examine the molecular details of that recognition using synthesized carbohydrates with specific modifications on the sialyl-Lewisx epitope. E- and L-Selectin require hydroxyl groups at the 2, 3 and 4 positions of the fucose residue. P-Selectin, however, requires only the 3-position hydroxyl group, while tolerating removal of the oxygen at positions 2 or 4 of fucose residue. Modifications of the glycerol side chain or the N-acetyl group of the sialic acid have little effect on the binding of any of the selectins. All three selectins bind efficiently to an oligosaccharide with a sulphate replacement for the sialic acid [sulpho-Lewisx, or SO4-3Gal ß14 (Fuc
13) Glc-cer-amide]. For E-Selectin, binding to sulpho-Lewisx appears to be equivalent to binding to sialyl-Lewisx, while for L-and P-Selectin binding to the sulphated structure shows characteristics distinct from sialyl-Lewisx recognition. Taken together, these data indicate that, while all three selectins can recognize sialyl-Lewisx, E-, L- and P-Selectin each display distinct carbohydrate ligand preferences. adhesion glycolipid inflammation lectin selectin
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