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Glycobiology, Vol 9, 343-352, Copyright © 1999 by Oxford University Press

ORIGINAL ARTICLES

A statistical analysis of N- and O-glycan linkage conformations from crystallographic data

AJ Petrescu, SM Petrescu, RA Dwek and MR Wormald
Oxford Glycobiology Institute, Department of Biochemistry,University of Oxford, South Parks Road, Oxford OX1 3QU, UK.

We have generated a database of 639 glycosidic linkage structures by an exhaustive survey of the available crystallographic data for isolated oligosaccharides, glycoproteins, and glycan-binding proteins. For isolated oligosaccharides there is relatively little crystallographic data available. A much larger number of glycoprotein and glycan-binding protein structures have now been solved in which two or more linked monosaccharides can be resolved. In the majority of these cases, only a few residues can be seen. Using the 639 glycosidic linkage structures, we have identified one or more distinct conformers for all the linkages. The O5-C1-O-C(x)' torsion angles for all these distinct conformers appear to be determined chiefly by the exo-anomeric effect. The Manalpha1-6Man linkage appears to be less restrained than the others, showing a wide degree of dispersion outside the ranges of the defined conformers. The identification of distinct conformers for glyco- sidic linkages allows "average" glycan structures to be modeled and also allows the easy identification of distorted glycosidic linkages. Such an analysis shows that the interactions between IgG Fc and its own N-linked glycan result in severe distortion of the terminal Galbeta1- 4GlcNAc linkage only, indicating the strong interactions that must be present between the Gal residue and the protein surface. The applicability of this crystallographic based analysis to glycan structures in solution is discussed. This database of linkagestructures should be a very useful reference tool in three-dimensional structure determinations.
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