Chemical synthesis of γ-secretase activating protein using pseudoglutamines as ligation sites

Biopolymers. 2015 Jan;104(1):37-45. doi: 10.1002/bip.22600.


The chemical synthesis of analogue of a novel γ-secretase activating protein, which may play a pivotal role in the formation of amyloid peptides, the precursor to Alzheimer's disease, is described. The linear polypeptide sequence, consisting of 121 amino acids was assembled from four unprotected peptide building blocks using a convergent ligation-based synthesis. A strategic mutation of three glutamine residues to cysteine enabled the ligations, and the cysteines were subsequently converted to pseudoglutamines, to mimic the native glutamine. The full length unfolded protein was obtained in milligram amounts and was demonstrated to be homogeneous by liquid chromatography and mass spectrometry.

Keywords: Alzheimers; ligation; pseudoglutamine; γ-secretase.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amyloid Precursor Protein Secretases / metabolism*
  • Amyloid beta-Peptides / chemistry
  • Glutamine / chemistry*
  • Ligation
  • Peptide Fragments / chemistry


  • Amyloid beta-Peptides
  • Peptide Fragments
  • Glutamine
  • Amyloid Precursor Protein Secretases