A single amino acid residue can determine the ligand specificity of E-selectin.

The Journal of Biological Chemistry
T P KoganP J Beck

Abstract

E-selectin (ELAM-1) is a member of the selectin family of cellular adhesion molecules. This family of proteins possesses an amino-terminal Ca(2+)-dependent lectin or carbohydrate recognition domain that is essential for ligand binding. A known E-selectin ligand is the carbohydrate antigen, sialyl Lewis(x) (sLe(x) (Neu5Ac alpha 2-3Gal beta 1-4(Fuc alpha 1-3)GlcNAc). We have developed a model of E-selectin binding to the sLe(x) tetrasaccharide, (Neu5Ac alpha 2-3Gal beta 1-4(Fuc alpha 1-3)GlcNAc), using the NMR-determined, E-selectin-bound solution conformation of sLe(x) (Cooke, R.M., Hale, R.S., Lister, S. G., Shah, G., and Weir, M. P. (1994) Biochemistry 33, 10591-10596) together with the x-ray crystallographic structures of E-selectin (Graves, B. J., Crowther, R. L., Chandran, C., Rumberger, J. B., Li, s., Huang, K.-S., Presky, D. H., Familletti, P. C., Wolitzky, B. A., and Burns, D. K. (1994) Nature 367, 532-538) (ligand unbound) and a related C-type animal lectin, the mannose-binding protein (Weis, W. I., Drickamer, K., and Hendrickson, A. (1992) Nature 360, 127-134) (ligand bound). Analysis of this model indicated that the alteration of one E-selectin amino acid, alanine 77, to a lysine residue might shift binding specificit...Continue Reading

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