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Related Concept Videos

Amyloid Fibrils03:03

Amyloid Fibrils

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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining,...
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Amyloid Fibrils03:03

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Protein Folding01:22

Protein Folding

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Related Experiment Video

Updated: May 1, 2026

Characterizing Individual Protein Aggregates by Infrared Nanospectroscopy and Atomic Force Microscopy
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Two-dimensional FTIR methods on amyloid aggregation and folding pathways.

Michał Maj1

  • 1Department of Chemistry - Ångström Laboratory, Uppsala University, Uppsala, Sweden.

Methods in Enzymology
|April 29, 2026
PubMed
Summary

Two-dimensional infrared (2DIR) spectroscopy precisely tracks amyloid aggregation, revealing transient intermediates and fibril structures. This method aids in understanding disease mechanisms in solution and tissues.

Keywords:
2DIR spectroscopyAmyloid aggregationAmyloidsDynamicsSecondary structureTransient IntermediateshIAPP

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Area of Science:

  • Biophysics
  • Spectroscopy
  • Biochemistry

Background:

  • Amyloid aggregation is central to neurodegenerative diseases.
  • Understanding aggregation kinetics and structural intermediates is crucial.
  • Current methods have limitations in residue-level and in-situ analysis.

Purpose of the Study:

  • To demonstrate the utility of two-dimensional infrared (2DIR) spectroscopy for studying amyloid aggregation.
  • To showcase advanced 2DIR techniques for detailed mechanistic insights.
  • To highlight 2DIR's capability in detecting amyloid structures within tissues.

Main Methods:

  • Utilized site-specific isotope labeling for residue-level kinetic monitoring.
  • Employed polarization-resolved 2DIR and cross-peak analysis.
  • Applied 2DIR spectroscopy to analyze amyloid structures in solution and tissue samples.

Main Results:

  • 2DIR spectroscopy successfully monitored residue-level kinetics and identified transient intermediates.
  • Distinguished coexisting fibril polymorphs and quantified secondary nucleation events.
  • Demonstrated the detection of amyloid structures directly within tissue samples.

Conclusions:

  • 2DIR spectroscopy is a powerful, structure-specific tool for amyloid aggregation research.
  • Advanced 2DIR techniques provide unprecedented detail on aggregation pathways.
  • This method has significant implications for studying amyloid-related diseases in physiological contexts.