Chemical Synthesis of Homogeneous Human E-Cadherin N-Linked Glycopeptides: Stereoselective Convergent Glycosylation and Chemoselective Solid-Phase Aspartylation

Org Lett. 2020 Nov 6;22(21):8349-8353. doi: 10.1021/acs.orglett.0c02971. Epub 2020 Oct 12.

Abstract

We report herein an efficient chemical synthesis of homogeneous human E-cadherin N-linked glycopeptides consisting of a heptapeptide sequence adjacent to the Asn-633 N-glycosylation site with representative N-glycan structures, including a conserved trisaccharide, a core-fucosylated tetrasaccharide, and a complex-type biantennary octasaccharide. The key steps are a chemoselective on-resin aspartylation using a pseudoproline-containing peptide and stereoselective glycosylation using glycosyl fluororide as a donor. This synthetic strategy demonstrates potential utility in accessing a wide range of homogeneous N-linked glycopeptides for the examination of their biological function.

MeSH terms

  • Aspartic Acid / chemistry*
  • Cadherins / chemistry*
  • Chemistry Techniques, Synthetic
  • Glycopeptides / chemical synthesis*
  • Glycopeptides / chemistry*
  • Glycosylation
  • Stereoisomerism

Substances

  • Cadherins
  • Glycopeptides
  • Aspartic Acid