Effects of glycosylation on peptide conformation: a synergistic experimental and computational study

Journal of the American Chemical Society
Carlos J BosquesB Imperiali

Abstract

Asparagine-linked glycosylation, the co-translational covalent attachment of carbohydrates to asparagine side chains, has a major effect on the folding, stability, and function of many proteins. The carbohydrate composition in mature glycoproteins is heterogeneous due to modification of the initial oligosaccharide by glycosidases and glycosyltransferases during the glycoprotein passage through the endoplasmic reticulum and Golgi apparatus. Despite the diversity of carbohydrate structures, the core beta-D-(GlcNAc)(2) remains conserved in all N-linked glycoproteins. Previously, results from our laboratory showed that the molecular composition of the core disaccharide has a critical and unique conformational effect on the peptide backbone. Herein, we employ a synergistic experimental and computational approach to study the effect of the stereochemistry of the carbohydrate--peptide linkage on glycopeptide structure. A glycopeptide derived from a hemagglutinin protein fragment was synthesized, with the carbohydrate attached to the peptide with an alpha-linked stereochemistry. Computational and biophysical analyses reveal that the conformations of the peptide and alpha- and beta-linked glycopeptides are uniquely influenced by the att...Continue Reading

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