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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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Updated: May 1, 2026

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Methods for characterizing the individual filament structures of amyloid peptide assemblies using atomic force

Afsheen Shahbaz1, Samantha L Weetman1, Claudia Chitty1

  • 1School of Natural Sciences, University of Kent, Canterbury, United Kingdom.

Methods in Enzymology
|April 29, 2026
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Summary

Researchers developed a new Atomic Force Microscopy (AFM) method to analyze individual amyloid filaments. This technique maps structural polymorphism in amyloid assemblies, aiding therapeutic discovery and nanomaterial development.

Keywords:
AFMAmyloidCPR-AFMFilamentsHelixImage analysisS-AFMStructural biology

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Area of Science:

  • Biophysics
  • Materials Science
  • Biochemistry

Background:

  • Distinct helical filamentous amyloid structures self-assemble from peptides/proteins in nature and disease.
  • Amyloid accumulation is crucial in neurodegenerative diseases (e.g., Alzheimer's) and metabolic diseases.
  • Amyloid structural polymorphism leads to diverse filament structures from the same precursors.

Purpose of the Study:

  • To develop an experimental method for analyzing individual amyloid filament structures.
  • To understand the relationship between polymorphic structures and their biological/physicochemical properties.
  • To enable detailed structural analysis of heterogeneous amyloid samples.

Main Methods:

  • Utilized topological Atomic Force Microscopy (AFM) imaging.
  • Employed Contact-Point Reconstruction AFM (CPR-AFM) image analysis.
  • Developed a detailed protocol for individual amyloid filament assembly analysis.

Main Results:

  • Resolved the 3D shapes of individual amyloid polymorphs.
  • Enabled mapping of polymorphic landscapes within amyloid assemblies.
  • Demonstrated an effective tool for individual filament-level structural analysis.

Conclusions:

  • The described AFM and CPR-AFM method provides an inexpensive, fast, and effective tool for amyloid structure analysis.
  • This approach facilitates the study of population distributions, rare structures, and variations within amyloid samples.
  • Offers opportunities for therapeutic discovery and novel bio-nanomaterials applications.