Ligand Profiling to Characterize Different Polymorphic Forms of α-Synuclein Aggregates.

Area of Science:

• Biochemistry
• Neuroscience
• Materials Science

Background:

• Amyloid fibrils are hallmarks of various diseases, particularly neurodegenerative disorders.
• The specific supramolecular structure of amyloid fibrils is often disease-specific.
• Characterizing fibril morphology could lead to novel diagnostic tools.

Purpose of the Study:

• To develop and validate a method for characterizing alpha-synuclein (αSyn) fibril morphology.
• To explore the potential of ligand-binding profiling as a diagnostic approach for amyloid-related diseases.

Main Methods:

• Utilized competition binding assays to identify and profile ligand binding sites on αSyn fibrils.
• Analyzed seven distinct types of binding sites across four different αSyn fibril morphologies.
• Quantified ligand affinities to differentiate between similar binding sites on distinct fibril structures.

Main Results:

• Identified seven unique ligand binding site types on four distinct αSyn fibril morphologies.
• Demonstrated significant differences in ligand affinities for similar binding sites across different fibril types.
• Successfully constructed individual profiles for αSyn fibrils based on binding site distribution and ligand interactions.

Conclusions:

• Ligand-based profiling offers a robust analytical method for characterizing fibril morphologies.
• The developed fluorescence binding assays are operationally simple and effective.
• This approach holds promise for the development of diagnostic tools for diseases involving amyloid fibrils.