Abstract
Here we review chemical and chemoenzymatic methods for the synthesis of lipid-linked oligosaccharides (LLOs) and their phosphonate analogues, which serve as substrates and inhibitors to investigate the structure and mechanism of protein N-glycosylation enzymes. We emphasize how to overcome the challenges pertaining to the instability and difficult physicochemical properties of this class of compounds.
1 Introduction
2 LLO Syntheses
2.1 Glycosyl Phosphate Syntheses
2.2 Glycosyl Phosphonates
2.3 Lipid Elongation
2.4 Lipid Phosphates
2.5 Coupling Reaction Strategies
3 Chemoenzymatic Synthesis of Elongated LLOs
4 Biological Properties of Synthetic LLOs
5 Conclusion
Key words
carbohydrates - polyprenols - diphosphates - phosphonates - glycosides - lipid-linked oligosaccharides