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Characterization of pH-Dependent Reversible Self-Assembly of Amyloid Beta 1-40-Coated Gold Colloids
Published on: March 21, 2025
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Surface effects mediate self-assembly of amyloid-β peptides
Yi-Chih Lin1, E James Petersson, Zahra Fakhraai
1Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States.
ACS Nano
|September 18, 2014
Summary
This study introduces a label-free method using spin-coating and atomic force microscopy to analyze surface effects on amyloid aggregation. It reveals that surface concentration significantly impacts amyloid-beta peptide fibril formation, suggesting a faster, alternative pathway on surfaces.
Area of Science:
- Biochemistry
- Materials Science
- Nanotechnology
Background:
- Amyloid aggregation is implicated in various diseases.
- Understanding surface effects on protein self-assembly is crucial.
- Existing methods for studying amyloid formation can be limited.
Purpose of the Study:
- To develop a label-free method for studying surface-induced amyloid aggregation.
- To investigate the influence of surface concentration on amyloid-beta peptide (Aβ(12-28)) morphology.
- To explore potential alternative pathways for amyloid formation on surfaces.
Main Methods:
- Utilized spin-coating for rapid, homogeneous sample drying.
- Employed atomic force microscopy (AFM) for high-resolution imaging.
- Controlled surface concentration as a key parameter for self-assembly.
Main Results:
- Amyloid-beta peptide aggregate morphology was strongly influenced by local surface concentration.
- Homogeneous, self-assembled protofibrils formed spontaneously on mica surfaces.
- Surface fibrillization occurred at much faster rates than in solution, with initiation at lower concentrations.
Conclusions:
- The developed method provides a simple approach for high-resolution AFM imaging of amyloid aggregates.
- Surface concentration is a critical factor modulating amyloid self-assembly.
- Amyloid formation on surfaces may involve a pathway bypassing or accelerating the nucleation stage.
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