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Updated: Jul 16, 2026

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Utilizing Time-Resolved Protein-Induced Fluorescence Enhancement to Identify Stable Local Conformations One α-Synuclein Monomer at a Time
Published on: May 30, 2021
Alpha-synuclein multistate folding thermodynamics: implications for protein misfolding and aggregation
Allan Chris M Ferreon1, Ashok A Deniz
1Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines MB-19, La Jolla, California 92037, USA.
Biochemistry
|March 24, 2007
Summary
Alpha-synuclein folding is multistate, involving two helical intermediates. This intrinsic propensity for multiple structures may impact its role in Parkinson's disease pathogenesis and toxicity.
Area of Science:
- Neuroscience
- Biochemistry
- Structural Biology
Background:
- Alpha-synuclein aggregation is central to Parkinson's disease pathogenesis.
- The role of lipid binding in alpha-synuclein conformation and aggregation is not fully understood.
Purpose of the Study:
- To thermodynamically characterize monomeric alpha-synuclein folding in the presence of SDS, a lipid mimetic.
- To investigate the structural basis of alpha-synuclein's intrinsic conformational flexibility.
Main Methods:
- Far-UV Circular Dichroism (CD) spectroscopy to detect conformational changes.
- Isothermal Titration Calorimetry (ITC) and Transmission Electron Microscopy (TEM) to study aggregation.
Main Results:
- Alpha-synuclein folding is a multistate process with two distinct alpha-helical intermediates (F and I states).
- These partially folded states exist with both monomeric and micellar SDS, indicating an intrinsic propensity for helical structures.
- SDS-induced aggregation was observed, suggesting a link between folding intermediates and oligomer formation.
Conclusions:
- Alpha-synuclein possesses an inherent ability to adopt multiple alpha-helical conformations, independent of full membrane binding.
- This conformational plasticity may be crucial for its biological function and its implication in neurodegenerative diseases like Parkinson's.
- The study provides insights into the relationship between alpha-synuclein's folding pathway and its aggregation behavior.
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