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Formulation and Characterization of Bioactive Agent Containing Nanodisks
Published on: March 17, 2023
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Cholesterol-containing lipid nanodiscs promote an α-synuclein binding mode that accelerates oligomerization
Martin Jakubec1,2, Espen Bariås1,2, Samuel Furse2
1Department of Biological Sciences, University of Bergen, Norway.
The FEBS Journal
|September 6, 2020
Summary
Cholesterol impacts alpha-synuclein (α-Syn) in Parkinson's disease by inhibiting its lipid binding but promoting fibrillation. This dual effect, dependent on lipid composition, offers new insights into disease mechanisms.
Area of Science:
- Neuroscience
- Biochemistry
- Molecular Biology
Background:
- Lipid dysregulation is linked to neurological disorders like Parkinson's disease.
- Alpha-synuclein (α-Syn) misfolding, central to Parkinson's, is influenced by the lipid environment.
- The precise role of cholesterol in α-Syn's lipid interactions and aggregation remains unclear.
Purpose of the Study:
- To investigate how cholesterol affects α-Syn's interaction with lipid bilayers.
- To determine cholesterol's influence on α-Syn oligomerization and fibrillation.
- To elucidate the molecular mechanisms of cholesterol's impact on α-Syn.
Main Methods:
- Utilized styrene-maleic acid nanodiscs with varying lipid compositions (zwitterionic, anionic, with/without cholesterol).
- Employed surface plasmon resonance and thioflavin T fluorescence assays to study α-Syn binding and fibrillation.
- Applied 1H-15N-correlated NMR to analyze α-Syn's structural changes and residue-specific lipid interactions.
Main Results:
- Cholesterol inhibited α-Syn's overall interaction with lipid bilayers.
- Cholesterol significantly accelerated α-Syn fibrillation, reducing lag times by over 20-fold.
- NMR revealed cholesterol's differential effects: enhancing NAC-lipid interaction in DOPC nanodiscs but inhibiting N/C-terminal binding in mixed lipid nanodiscs.
Conclusions:
- Cholesterol exhibits a complex, context-dependent role in α-Syn pathology.
- The findings highlight cholesterol's dual action in modulating both α-Syn aggregation propensity and membrane interactions.
- Understanding these cholesterol-mediated mechanisms is crucial for developing Parkinson's disease therapeutics.
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