Probing Intermolecular Interactions within the Amyloid β Trimer Using a Tethered Polymer Nanoarray

Sibaprasad Maity, Apurba Pramanik, Yuri L. Lyubchenko

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Amyloid oligomers are considered the most neurotoxic species of amyloid aggregates. Spontaneous assembly of amyloids into aggregates is recognized as a major molecular mechanism behind Alzheimer's disease and other neurodegenerative disorders involving protein aggregation. Characterization of such oligomers is extremely challenging but complicated by their transient nature. Previously, we introduced a flexible nanoarray (FNA) method enabling us to probe dimers assembled by the amyloid β (14-23) [Aβ (14-23)] peptide. The study presented herein modifies and enhances this approach to assemble and probe trimers of Aβ (14-23). A metal-free click chemistry approach was used, in which dibenzocyclooctyne (DBCO) groups were incorporated at selected sites within the FNA template to click Aβ (14-23) monomers at their terminal azide groups. Atomic force microscopy (AFM) force spectroscopy was employed to characterize the assemblies. The force measurement data demonstrate that the dissociation of the trimer undergoes a stepwise pattern, in which the first monomer dissociates at the rupture force ∼48 ± 2.4 pN. The remaining dimer ruptures at the second step at a slightly larger rupture force (∼53 ± 3.2 pN). The assembled trimer was found to be quite dynamic, and transient species of this inherently dynamic process were identified.

Original languageEnglish (US)
Pages (from-to)2755-2762
Number of pages8
JournalBioconjugate Chemistry
Volume29
Issue number8
DOIs
StatePublished - Aug 15 2018

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering
  • Pharmacology
  • Pharmaceutical Science
  • Organic Chemistry

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