Abstract
This chapter describes a rapid and efficient approach for the solid-phase synthesis of N-linked glycopeptides that utilizes on-resin glycosylamine coupling to produce N-linked glycosylation sites. In this method, the full-length nonglycosylated peptide is first synthesized on a solid-phase support using standard Fmoc chemistry. The glycosylation site is then introduced through an orthogonally protected 2-phenylisopropyl (PhiPr) aspartic acid (Asp) residue. After selective deprotection of the Asp residue, a high mannose type oligosaccharide glycosylamine is coupled on-resin to the free Asp side chain to form a N-glycosidic bond. Subsequent protecting group removal and peptide cleavage from the resin ultimately yields the desired glycopeptide. This strategy provides an effective route for conducting glycosylation reactions on a solid-phase support, simplifies the process of glycopeptide purification relative to solution-phase glycopeptide synthesis strategies, and enables the recovery of potentially valuable, un-reacted oligosaccharides. This approach has been applied to the solid-phase synthesis of the N-linked high mannose glycosylated form of peptide T (ASTTTNYT), a fragment of the HIV-1 envelope glycoprotein gp120.
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Acknowledgment
This work was supported by Award Number R01GM090080 from the National Institute of General Medical Sciences.
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Chen, R., Tolbert, T.J. (2011). On-Resin Convergent Synthesis of a Glycopeptide from HIV gp120 Containing a High Mannose Type N-Linked Oligosaccharide. In: Mark, S. (eds) Bioconjugation Protocols. Methods in Molecular Biology, vol 751. Humana Press. https://doi.org/10.1007/978-1-61779-151-2_22
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DOI: https://doi.org/10.1007/978-1-61779-151-2_22
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