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Updated: Jul 8, 2026

Generation of Alpha-Synuclein Preformed Fibrils from Monomers and Use In Vivo
Published on: June 2, 2019
Trimethylamine-N-oxide-induced folding of alpha-synuclein
1Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA. uversky@hydrogen.ucsc.edu
Trimethylamine-N-oxide (TMAO) influences human alpha-synuclein structure and fibrillation. Moderate TMAO promotes intermediate folding and fibrillation, while higher concentrations induce helical structures and oligomer formation.
Area of Science:
- Biochemistry
- Structural Biology
- Protein Chemistry
Background:
- Human alpha-synuclein is a natively unfolded protein implicated in neurodegenerative diseases.
- Trimethylamine-N-oxide (TMAO) is a natural osmolyte known to influence protein structure.
- Understanding alpha-synuclein's conformational changes is crucial for disease research.
Purpose of the Study:
- To investigate the impact of TMAO on the structural properties of human alpha-synuclein.
- To examine how TMAO affects the fibril formation propensity of alpha-synuclein.
- To elucidate the specific conformations adopted by alpha-synuclein in the presence of TMAO.
Main Methods:
- Physico-chemical methods were employed to analyze protein structure and behavior.
- Spectroscopic techniques likely used to monitor conformational changes (e.g., CD spectroscopy).
- Assays to assess protein aggregation and fibril formation kinetics.
Main Results:
- TMAO induced concentration-dependent folding of human alpha-synuclein.
- Moderate TMAO concentrations led to a partially folded intermediate with increased fibrillation propensity.
- High TMAO concentrations resulted in tightly folded, helical alpha-synuclein structures forming oligomers.
Conclusions:
- TMAO modulates alpha-synuclein conformation, influencing its aggregation pathway.
- The tightly folded helical conformation induced by high TMAO may represent a physiologically relevant state.
- These findings offer insights into the role of osmolytes in protein folding and disease pathogenesis.
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