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In this review, we will discuss the enzymes that are involved in the synthesis and degradation of glycoconjugates and we will give an overview of the inhibitors and activity-based probes (ABPs) that have been used to study these. Following discussion of some general aspects of the biosynthesis and degradation of N-linked glycoproteins, attention is focused on the enzymes that hydrolyze the protein-carbohydrate linkage, peptide N-glycanase and glycosylasparaginase and their mechanism. We then focus on the biosynthesis of O-linked glycoproteins and glycolipids and in particular on the enzymes that hydrolyze the interglycosidic linkages in these, the glycosidases. Some important mechanism-based glycosidase inhibitors that form a covalent bond with the targeted enzyme(s), their corresponding ABPs and their application to study this class of enzymes are highlighted. Finally, alternative pathways for degradation of glycoconjugates and an ABP-based strategy to study these will be discussed.

Irreversible inhibitors and activity-based probes as research tools in chemical glycobiology