Probing the secondary structure of individual Aβ40 amorphous aggregates and fibrils by AFM-IR spectroscopy.

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ID: 171918
2020
Structural characterization of aggregates and fibrils of the Aβ protein is pivotal to the molecular level elucidation of Alzheimer's disease (AD). AFM-IR provides nanoscale resolution, and thus allows for spectroscopic interrogation of individual aggregates and fibrils. During aggregation of Aβ we observed mainly disordered Aβ at t=15 min, substantial structural diversity including co-existence of parallel and antiparallel β-sheets within a large amorphous aggregate at t=2 hours, while fibrils exhibited the expected signature of parallel β-sheets at t=1 week. The resonance observed for parallel β-sheets at t=2 hours coincides with that observed for fibrils (at 1634 cm-1), indicating that fibril-like species exist within the large aggregates. Thus, nucleation might occur within such species, in analogy to current theories of protein crystallization where nucleation occurs within large protein clusters. Cu2+ perturbs Aβ aggregation, catalysing rapid formation of amorphous aggregates with diverse secondary structure, but inhibiting fibril growth.
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herzberg2020probingchembiochem Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Herzberg, Mikkel;Szunyogh, Daniel;Thulstrup, Peter W;Hassenkam, Tue;Hemmingsen, Lars;
Journal chembiochem : a european journal of chemical biology
Year 2020
DOI 10.1002/cbic.202000632
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