Monosaccharides modulate HCV E2 protein-derived peptide biological properties

Biochem Biophys Res Commun. 2007 Apr 6;355(2):409-18. doi: 10.1016/j.bbrc.2007.01.167. Epub 2007 Feb 8.

Abstract

A hepatitis C virus E(2) protein-derived sequence was selected for studying the effect of N-glycosylation on the peptide chain's conformational structure. The results suggested that the (534)TDVF(537) motif contained in peptide 33402 ((529)WGENDTDVFVLNNTRY(544)) had a type III beta-turn, relevant in antigen recognition of polyclonal antibodies, binding to human cells, and binding to HLA DRB1 *0401 molecules. N-Glycopeptides derived from this sequence contained monosaccharides in Asn(532). N-Glycopeptides presented differences in peptide chain structure compared to non-glycosylated peptides. Peptide 33402 specifically bound to human cells, specificity becoming lost when it was N-glycosylated. N-Glycosylation decreased antigen recognition of mouse polyclonal sera against this sequence. N-Glycopeptide binding to HLA DRB1 *0401 molecules was similar to that presented by non-glycosylated peptide, indicating that N-glycosylation did not affect binding to HLA DRB1 *0401 molecules. N-Glycosylation induced changes at structural and functional level which could be relevant for modulating human cell binding properties and antibody recognition.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Circular Dichroism
  • Enzyme-Linked Immunosorbent Assay
  • Glycosylation
  • Hepacivirus / metabolism*
  • Models, Molecular
  • Molecular Sequence Data
  • Monosaccharides / pharmacology*
  • Nuclear Magnetic Resonance, Biomolecular
  • Peptides / metabolism
  • Peptides / pharmacology*
  • Protein Binding
  • Viral Proteins / chemistry
  • Viral Proteins / metabolism
  • Viral Proteins / pharmacology*

Substances

  • Monosaccharides
  • Peptides
  • Viral Proteins