The Pathological G51D Mutation in Alpha-Synuclein Oligomers Confers Distinct Structural Attributes and Cellular Toxicity
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Published on: January 5, 2016
Catherine K Xu1, Marta Castellana-Cruz1, Serene W Chen2
1Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
Abstract:
A wide variety of oligomeric structures are formed during the aggregation of proteins associated with neurodegenerative diseases. Such soluble oligomers are believed to be key toxic species in the related disorders; therefore, identification of the structural determinants of toxicity is of upmost importance. Here, we analysed toxic oligomers of α-synuclein and its pathological variants in order to identify structural features that could be related to toxicity and found a novel structural polymorphism within G51D oligomers. These G51D oligomers can adopt a variety of β-sheet-rich structures with differing degrees of α-helical content, and the helical structural content of these oligomers correlates with the level of induced cellular dysfunction in SH-SY5Y cells. This structure-function relationship observed in α-synuclein oligomers thus presents the α-helical structure as another potential structural determinant that may be linked with cellular toxicity in amyloid-related proteins.
Insights
Toxic oligomers in neurodegenerative diseases are key. Researchers found that the helical content in G51D alpha-synuclein oligomers correlates with cellular dysfunction, revealing a new structural determinant of toxicity.
Area of Science:
- Neuroscience
- Biochemistry
- Structural Biology
Background:
- Protein aggregation into oligomers is central to neurodegenerative diseases.
- Soluble oligomers are considered key toxic species.
- Identifying structural determinants of oligomer toxicity is crucial for understanding disease mechanisms.
Purpose of the Study:
- To analyze toxic alpha-synuclein oligomers and their variants.
- To identify structural features linked to toxicity.
- To investigate a novel structural polymorphism in G51D oligomers.
Main Methods:
- Analysis of toxic alpha-synuclein oligomers and pathological variants.
- Structural characterization of G51D oligomers.
- Correlation of oligomer structure with cellular dysfunction in SH-SY5Y cells.
Main Results:
- A novel structural polymorphism was identified within G51D oligomers.
- These oligomers exhibit diverse beta-sheet-rich structures with varying alpha-helical content.
- Higher alpha-helical content in G51D oligomers correlated with increased cellular dysfunction.
Conclusions:
- Alpha-helical structure content is a potential determinant of cellular toxicity in alpha-synuclein oligomers.
- This structure-function relationship provides insights into the toxicity of amyloid-related proteins.
- Findings advance understanding of molecular mechanisms in neurodegenerative diseases.
