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Related Experiment Videos

Spatial persistence of angular correlations in amyloid fibrils.

Tuomas P J Knowles1, Jeffrey F Smith, Aidan Craig

  • 1Cavendish Laboratory, University of Cambridge, Cambridge CB3 OHE, United Kingdom and Nanoscience Centre, University of Cambridge, Cambridge CB3 OFF, United Kingdom.

Physical Review Letters
|June 29, 2006
PubMed
Summary

We quantified torsional fluctuations in amyloid fibrils using atomic force microscopy. These nanoscale protein structures maintain angular correlation over microns, revealing insights into their stability and defects.

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Area of Science:

  • Biophysics
  • Materials Science
  • Nanotechnology

Background:

  • Amyloid fibrils are protein aggregates implicated in various diseases.
  • Understanding their structural dynamics is crucial for therapeutic development.
  • One-dimensional fibril formation involves complex self-assembly processes.

Purpose of the Study:

  • To quantify torsional fluctuations in self-assembled amyloid fibrils.
  • To investigate the persistence of angular correlation along fibril length.
  • To model fibril disorder and determine stabilizing energy scales.

Main Methods:

  • Utilized atomic force microscopy (AFM) height maps for high-resolution imaging.
  • Analyzed torsional fluctuations and angular correlations in nanoscale structures.

Related Experiment Videos

  • Developed a model to assess thermal fluctuations and structural defects.

    • Main Results:

    • Resolved and quantified torsional fluctuations in three polypeptide-based amyloid systems.
    • Demonstrated angular correlation maintained over several microns (thousands of molecules).
    • Determined quantitative values for defect density and interaction energy scales.

    Conclusions:

    • Amyloid fibrils exhibit significant torsional fluctuations.
    • Long-range order is maintained in these nanoscale assemblies.
    • The study provides quantitative insights into amyloid fibril stability and defect energetics.