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Updated: Nov 15, 2025
07:56
Utilizing Time-Resolved Protein-Induced Fluorescence Enhancement to Identify Stable Local Conformations One α-Synuclein Monomer at a Time
Published on: May 30, 2021
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Structural insights into α-synuclein monomer-fibril interactions
Pratibha Kumari1, Dhiman Ghosh1, Agathe Vanas1
1Department of Chemistry and Applied Biosciences, Laboratory of Physical Chemistry, ETH Zurich, 8093 Zurich, Switzerland.
Summary
Parkinson's disease involves protein aggregation. This study shows alpha-synuclein monomers unfold and align on fibrils, accelerating aggregation through secondary nucleation.
Area of Science:
- Neuroscience
- Biochemistry
- Structural Biology
Background:
- Protein aggregation into amyloid fibrils is linked to neurodegenerative diseases like Parkinson's disease.
- Secondary nucleation significantly accelerates protein aggregation by monomer absorption onto existing fibrils.
Purpose of the Study:
- To investigate the interaction between monomeric alpha-synuclein and its fibrillar form using advanced spectroscopy.
- To elucidate the role of these interactions in the secondary nucleation pathway of alpha-synuclein aggregation.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy.
- Electron Paramagnetic Resonance (EPR) spectroscopy.
Main Results:
- Monomeric alpha-synuclein (α-Syn) interacts transiently with amyloid fibrils.
- Interactions occur between the positively charged N-terminus of α-Syn monomers and the negatively charged C-termini of fibrils.
- These interactions promote monomer unfolding and alignment on the fibril surface, increasing local concentration.
Conclusions:
- Intramolecular unfolding of alpha-synuclein is a critical factor in secondary nucleation.
- Understanding these interactions provides insights into Parkinson's disease pathogenesis.
- The findings highlight a mechanism accelerating amyloid fibril formation.
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