Related Experiment Video

Updated: Aug 8, 2025

Rapid Generation of Amyloid from Native Proteins In vitro
05:48

Rapid Generation of Amyloid from Native Proteins In vitro

Published on: December 5, 2013

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Disease-relevant β2-microglobulin variants share a common amyloid fold

Martin Wilkinson1, Rodrigo U Gallardo1,2, Roberto Maya Martinez1,3

  • 1Astbury Centre for Structural Molecular Biology, School of Molecular & Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK.

Nature Communications
|March 2, 2023
PubMed

Insights

Beta-2 microglobulin (β2m) variants form amyloid fibrils with a common building block, explaining distinct disease pathologies like dialysis-related amyloidosis (DRA). This suggests a

Area of Science:

  • Biochemistry
  • Structural Biology
  • Medical Research

Background:

  • Beta-2 microglobulin (β2m) and its truncated form ΔΝ6 are implicated in dialysis-related amyloidosis (DRA).
  • Specific point mutations in β2m lead to distinct amyloidosis pathologies, affecting different organs.
  • Understanding the structural basis of these fibril formations is crucial for disease mechanism elucidation.

Purpose of the Study:

  • To determine the in vitro structures of amyloid fibrils formed by β2m variants.
  • To investigate the structural basis for the distinct pathologies caused by β2m mutations.
  • To explore the assembly principles of β2m amyloid fibrils.

Main Methods:

  • Cryo-electron microscopy (cryoEM) was used to analyze fibril structures.
  • Fibrils were formed from β2m variants under identical in vitro conditions.
  • Structural analysis focused on identifying common building blocks and polymorphic arrangements.

Main Results:

  • Each β2m variant formed polymorphic amyloid fibrils.
  • A common 'lego-like' amyloid building block was identified across different variant fibril structures.
  • The structural diversity arises from the assembly of this common building block.

Conclusions:

  • The study proposes a 'many sequences, one amyloid fold' paradigm for β2m amyloid formation.
  • This contrasts with the 'one sequence, many amyloid folds' model observed in intrinsically disordered proteins.
  • The findings provide insights into the structural mechanisms underlying different β2m-associated amyloidosis diseases.

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