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Amyloid Fibrils

Amyloid Fibrils

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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Updated: Sep 5, 2025

Biochemical Purification and Proteomic Characterization of Amyloid Fibril Cores from the Brain

Biochemical Purification and Proteomic Characterization of Amyloid Fibril Cores from the Brain

Published on: April 28, 2022

Structure-specific amyloid precipitation in biofluids.

M Rodrigues^1,2, P Bhattacharjee^3,4, A Brinkmalm^3,4

¹Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, UK.

Nature Chemistry

|July 7, 2022

Summary

This summary is machine-generated.

Researchers developed amyloid precipitation to capture and analyze toxic protein aggregates in biofluids. This method aids in understanding neurodegenerative diseases by revealing aggregate composition and structure.

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Area of Science:

Biochemistry
Neuroscience
Analytical Chemistry

Background:

Toxic protein aggregates are implicated in neurodegenerative diseases.
Their low concentration and heterogeneity in biofluids hinder in vivo analysis.
Current methods lack the sensitivity and specificity for unbiased aggregate characterization.

Purpose of the Study:

To develop a novel method for capturing and analyzing amyloid-containing protein aggregates from human biofluids.
To enable unbiased determination of the molecular composition and structural features of in vivo aggregates.
To advance the understanding of pathogenic mechanisms in neurodegenerative diseases.

Main Methods:

Development of a structure-specific chemical dimer, CAP-1 (capture molecule for amyloid precipitation), targeting amyloid cross-β sheets.
Immobilization of CAP-1 onto magnetic beads for efficient capture of amyloid aggregates.
Isolation and characterization of captured aggregates using single-molecule fluorescence imaging and mass spectrometry.

Main Results:

Amyloid precipitation successfully captures amyloid-containing aggregates from human cerebrospinal fluid.
The method allows for unbiased isolation of these ultra-low concentration, heterogeneous aggregates.
Characterization reveals molecular composition and structural features of in vivo aggregates.

Conclusions:

Amyloid precipitation is a powerful, unbiased technique for studying toxic protein aggregates in neurodegenerative diseases.
This method overcomes previous limitations in analyzing in vivo aggregate composition.
It provides new insights into the molecular pathology of neurodegenerative conditions.