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Understanding alpha-synuclein aggregation propensity in animals and humans.

Natalie G Horgan1, Annie M McCarty1, Ashley A Hetak2

  • 1Department of Basic Medical Sciences, College of Veterinary Medicine, Purdue University, West Lafayette, IN, 47906, United States.

Biochemistry and Biophysics Reports
|September 3, 2024
PubMed
Summary

Alpha-synuclein (α-syn) aggregation is key to Parkinson's Disease (PD). This study found specific α-syn fragments, particularly 37-61 and 62-86, readily form fibrils, with mutations like A53T potentially increasing aggregation risk.

Keywords:
AggregationAlpha-synucleinFibrilParkinson's diseaseThioflavin T (ThT)Transmission electron microscopy (TEM)

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Alpha-synuclein (α-syn) aggregation is a central pathological hallmark of Parkinson's Disease (PD).
  • Understanding the aggregation propensity of α-syn fragments is crucial for elucidating PD pathogenesis.
  • Variability in α-syn sequences across species may influence aggregation behavior.

Purpose of the Study:

  • To evaluate the aggregation propensity of human and animal α-syn fragment peptides.
  • To identify key amino acid residues and regions involved in α-syn fibril formation.
  • To investigate the role of specific mutations (e.g., A53T) and regions (e.g., NAC) in α-syn aggregation.

Main Methods:

  • Peptide design based on human and animal α-syn sequence variability.
  • Thioflavin T (ThT) fluorescence assay to detect fibril formation.
  • Transmission electron microscopy (TEM) for visualizing fibril structures.

Main Results:

  • Human α-syn fragments 51-75, 37-61, 62-86, 76-100, and 116-140 showed significantly higher aggregation propensity than fragments 1-25, 26-50, and 91-115.
  • α-syn fragments 37-61 and 62-86 from all analyzed species formed fibrils, confirmed by ThT and TEM.
  • The A53T mutation in α-syn 37-61 fragments potentially enhanced aggregation; the non-amyloid-β component (NAC) region within α-syn 62-86 was consistently found in aggregating fragments.
  • High valine and low acidic amino acid content correlated with α-syn fibril formation.

Conclusions:

  • The α-syn 37-61 and 62-86 regions are highly susceptible to aggregation across species.
  • Specific mutations and the NAC region may drive α-syn fibril formation in PD.
  • Amino acid composition, particularly valine and acidic residues, can predict α-syn aggregation potential.