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Probing differences among Aβ oligomers with two triangular trimers derived from Aβ.

Adam G Kreutzer1, Gretchen Guaglianone1, Stan Yoo1

  • 1Department of Chemistry, University of California Irvine, Irvine, CA 92697.

Proceedings of the National Academy of Sciences of the United States of America
|May 22, 2023
PubMed
Summary
This summary is machine-generated.

Two stabilized beta-amyloid (Aβ) trimers show distinct structural and biological properties, influencing Alzheimer's disease pathogenesis. Understanding these differences offers insights into Aβ oligomer variations and their cellular effects.

Keywords:
Alzheimer’s diseaseAβ oligomersX-ray crystallographycellular toxicitynative mass spectrometry

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Structural Biology

Background:

  • Beta-amyloid (Aβ) peptide assembly into oligomers and fibrils is central to Alzheimer's disease pathogenesis.
  • Aβ's conformational flexibility complicates the structural characterization of homogeneous oligomers.
  • Understanding Aβ oligomer diversity is crucial for elucidating Alzheimer's disease mechanisms.

Purpose of the Study:

  • To compare the structural, biophysical, and biological characteristics of two distinct, covalently stabilized Aβ trimers.
  • To investigate how these trimers influence the aggregation, toxicity, and cellular interactions of full-length Aβ.
  • To develop a model explaining how different Aβ trimers lead to varied biological outcomes.

Main Methods:

  • X-ray crystallography for detailed trimer structure determination.
  • Solution-phase biophysical studies to analyze assembly properties.
  • Cell-based assays to assess cellular uptake, apoptosis induction, and toxicity mechanisms.

Main Results:

  • Both trimers formed ball-shaped dodecamers, but exhibited distinct assembly and biological behaviors.
  • One trimer formed soluble oligomers inducing apoptosis via endocytosis; the other formed insoluble aggregates causing membrane toxicity.
  • The trimers differentially affected full-length Aβ aggregation, toxicity, and cellular interactions.

Conclusions:

  • The two Aβ trimers share characteristics with full-length Aβ oligomers, validating their use as models.
  • Distinct structural and assembly properties of Aβ trimers correlate with varied biological effects.
  • This study provides a framework for understanding the heterogeneity of Aβ oligomers in Alzheimer's disease.