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Updated: Aug 5, 2025

Utilizing Time-Resolved Protein-Induced Fluorescence Enhancement to Identify Stable Local Conformations One α-Synuclein Monomer at a Time
Published on: May 30, 2021
Morphology-Dependent Interactions between α-Synuclein Monomers and Fibrils.
Tinna Pálmadóttir1, Christopher A Waudby2,3, Katja Bernfur1
1Biochemistry and Structural Biology, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
Two distinct alpha-synuclein fibril structures, A and B, form under identical conditions, differing in surface properties and stability. Morphology B fibrils are more stable and convert from morphology A over time.
Area of Science:
- Biochemistry
- Structural Biology
- Neuroscience
Background:
- Amyloid fibrils exhibit diverse morphologies influenced by solution conditions and protein sequences.
- Alpha-synuclein fibrils are implicated in Parkinson's disease pathogenesis.
Purpose of the Study:
- To investigate the formation of distinct alpha-synuclein fibril morphologies under identical conditions.
- To characterize the structural and surface property differences between these morphologies.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy
- Circular Dichroism (CD) spectroscopy
- Fluorescence spectroscopy (Thioflavin T binding)
- Cryo-transmission electron microscopy (cryo-TEM)
Main Results:
- Two distinct alpha-synuclein fibril morphologies (A and B) were observed under identical conditions.
- Morphologies A and B display different surface properties, affecting monomer interaction.
- Morphology B fibrils exhibit lower solubility and higher thermodynamic stability compared to morphology A.
- Morphology A fibrils can convert to morphology B over prolonged incubation.
Conclusions:
- Chemically identical alpha-synuclein can form distinct fibril structures with varying surface characteristics.
- Fibril morphology influences monomer-fibril interactions and thermodynamic stability.
- The observed conversion suggests a pathway towards more stable fibril structures.
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