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Updated: Feb 6, 2026

Technique for Intranasal Administration of α-Synuclein Aggregates
Published on: November 8, 2024
Structural intermediates during α-synuclein fibrillogenesis on phospholipid vesicles.
Gemma Comellas1, Luisel R Lemkau, Donghua H Zhou
1Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.
Alpha-synuclein (AS) fibrils convert from helical to β-sheet structures, with or without lipids. Anionic phospholipids alter the N-terminal domain of AS fibrils, impacting Parkinson's disease pathology.
Area of Science:
- Biochemistry
- Neuroscience
- Structural Biology
Background:
- Lewy bodies, hallmarks of Parkinson's disease, are primarily composed of alpha-synuclein (AS) fibrils.
- Alpha-synuclein's interaction with phospholipid membranes is crucial, yet atomic-level data on lipid-induced aggregation is lacking.
Purpose of the Study:
- To investigate the structural conversion of alpha-synuclein fibrils in the presence and absence of anionic phospholipid vesicles.
- To elucidate the role of lipids in alpha-synuclein aggregation pathways at an atomic level.
Main Methods:
- Solid-state NMR spectroscopy to analyze structural changes.
- Electron microscopy to visualize fibril morphology.
- Trapping and examining intermediate states during fibril formation.
Main Results:
- Alpha-synuclein undergoes a conformational conversion from α-helical to β-sheet structures, irrespective of anionic phospholipid presence.
- Mature AS fibrils show no major overall fold changes whether formed with or without lipids.
- Site-specific analysis reveals significant N-terminal domain perturbations and minor NAC domain changes in lipid-associated fibrils.
Conclusions:
- A model for alpha-synuclein fibrillogenesis in the presence of phospholipid vesicles is proposed.
- Anionic phospholipids specifically modulate the N-terminal region of alpha-synuclein fibrils, offering insights into Parkinson's disease mechanisms.
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