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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Self-assembly of beta-amyloid 42 is retarded by small molecular ligands at the stage of structural intermediates

B Bohrmann1, M Adrian, J Dubochet

  • 1Pharma Division, F. Hoffmann-La Roche AG, Basel, CH-4070, Switzerland. bernd.bohrmann@roche.com

Journal of Structural Biology
|August 15, 2000
PubMed

Insights

Researchers identified a novel polymeric sheet structure during amyloid-beta (Abeta) assembly, a key process in Alzheimer's disease (AD). A compound, Ro 90-7501, was found to inhibit Abeta fibril formation, offering a potential therapeutic strategy for AD.

Area of Science:

  • Biochemistry
  • Neuroscience
  • Structural Biology

Background:

  • Alzheimer's disease (AD) pathogenesis is linked to amyloid-beta (Abeta) peptide aggregation into fibrils.
  • Inhibiting Abeta fibril assembly presents a promising therapeutic avenue for AD.

Purpose of the Study:

  • To investigate the initial native assembly structure of Abeta42 using electron cryomicroscopy.
  • To identify compounds that reduce Abeta42-induced toxicity and inhibit fibril formation.

Main Methods:

  • Electron cryomicroscopy to visualize Abeta42 assembly intermediates.
  • Cell-based screening assay to identify toxicity-reducing compounds.
  • Assays for compound binding, radical scavenging, and influence on Abeta42 assembly.

Main Results:

  • A nonfibrillar, polymeric Abeta42 sheet structure was identified alongside known fibrillar intermediates.
  • A temporal sequence of assembly was observed: sheets, then intermediates, then mature fibrils.
  • Compound Ro 90-7501 inhibited mature fibril formation, accumulating earlier structures.

Conclusions:

  • Abeta assembly involves a transient polymeric sheet intermediate.
  • Ro 90-7501 acts as a prototypic inhibitor of Abeta42 fibril formation.
  • This compound can be a tool for studying the molecular mechanisms of Abeta assembly.

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