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Hsp90 inhibits α-synuclein aggregation by interacting with soluble oligomers
Soumya Daturpalli1, Christopher A Waudby, Sarah Meehan
1Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK.
Journal of Molecular Biology
|August 17, 2013
Summary
Heat shock protein 90 (Hsp90) prevents the aggregation of toxic alpha-synuclein (α-synuclein) species linked to Parkinson's disease. This interaction renders the protein oligomers harmless and non-toxic to cells.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Alpha-synuclein (α-synuclein) aggregation forms Lewy bodies, a hallmark of Parkinson's disease (PD).
- Heat shock proteins, including Hsp90, are found in Lewy bodies, with increased Hsp90 levels in PD brains.
- The role of Hsp90 in α-synuclein aggregation remains largely uncharacterized compared to Hsp70.
Purpose of the Study:
- To investigate the effect of Hsp90 on the aggregation of the pathological A53T mutant of α-synuclein in vitro.
- To determine if Hsp90 can inhibit the formation of toxic α-synuclein aggregates.
Main Methods:
- In vitro aggregation assays.
- Biophysical techniques to study protein interactions and structure.
- Cellular toxicity assays.
Main Results:
- Hsp90 effectively prevents the aggregation of A53T α-synuclein.
- Hsp90 binds strongly to toxic α-synuclein oligomers in an ATP-independent manner.
- Complex formation with Hsp90 neutralizes the toxicity of α-synuclein oligomers to cells.
Conclusions:
- Hsp90 plays a protective role by inhibiting α-synuclein aggregation and its associated toxicity.
- Hsp90 may represent a therapeutic target for Parkinson's disease.
- These findings suggest a significant in vivo role for Hsp90 in modulating α-synuclein pathology.
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