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Updated: May 29, 2026
06:27
Analysis of β-Amyloid-induced Abnormalities on Fibrin Clot Structure by Spectroscopy and Scanning Electron Microscopy
Published on: November 30, 2018
Effect of zinc binding on β-amyloid structure and dynamics: implications for Aβ aggregation
Nasrollah Rezaei-Ghaleh1, Karin Giller, Stefan Becker
1Department for NMR-Based Structural Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany. nare@nmr.mpibpc.mpg.de
Biophysical Journal
|September 6, 2011
Summary
Zinc binding to amyloid-beta (Aβ) peptides alters their aggregation pathways. This study reveals how zinc influences Aβ40 structure and dynamics, promoting less toxic amorphous aggregates relevant to Alzheimer's disease research.
Area of Science:
- Biochemistry
- Neuroscience
- Structural Biology
Background:
- Alzheimer's disease pathogenesis is linked to amyloid-beta (Aβ) peptide aggregation into toxic oligomers.
- Zinc (Zn(II)) binding to Aβ in vitro can shift aggregation from amyloid fibrils to less toxic amorphous forms.
- The specific aggregate state propensity depends on monomeric and aggregate structural and dynamical properties.
Purpose of the Study:
- To investigate the structural and dynamical effects of Zn(II) binding to monomeric Aβ40 using NMR spectroscopy.
- To explore the role of intrinsic dynamics in aggregation precursors by examining Aβ42 dynamics.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy was employed to study Aβ40.
- (15)N relaxation measurements were performed on Aβ42 to assess dynamics.
- Structural and dynamical changes upon Zn(II) binding were analyzed.
Main Results:
- Zn(II) binding to the N-terminus of Aβ40 induces a rigid turn-like structure (Val24-Lys28) with increased mobility in flanking regions.
- In contrast, Aβ42 exhibits increased rigidity at the C-terminus upon Zn(II) interaction.
- These distinct structural changes are proposed to influence the peptide's aggregation propensity.
Conclusions:
- Zn(II) binding significantly alters the structural dynamics of Aβ peptides.
- The observed changes in Aβ40 and Aβ42 dynamics upon Zn(II) binding correlate with their propensity to form different aggregate types.
- Understanding these Zn(II)-mediated structural changes offers insights into Alzheimer's disease mechanisms and potential therapeutic strategies.
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