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Methionine oxidation, alpha-synuclein and Parkinson's disease
Biochimica Et Biophysica Acta
|February 1, 2005
Summary
Oxidative stress modifies alpha-synuclein, inhibiting its aggregation linked to Parkinson's disease. Environmental metals can reverse this protective effect, suggesting roles for both stress and pollution in the disease.
Area of Science:
- Neuroscience
- Biochemistry
- Pathology
Background:
- Alpha-synuclein aggregation in dopaminergic neurons is central to Parkinson's disease pathogenesis.
- Oxidative stress is implicated as a contributing factor in Parkinson's disease.
- Methionine residues in alpha-synuclein are susceptible to oxidation.
Purpose of the Study:
- To investigate the effect of methionine oxidation on alpha-synuclein fibrillation.
- To explore the role of oxidative stress and metal ions in alpha-synuclein aggregation relevant to Parkinson's disease.
Main Methods:
- In vitro oxidation of alpha-synuclein using hydrogen peroxide to convert methionine residues to sulfoxides.
- Analysis of protein conformation using biophysical techniques.
- Assessment of alpha-synuclein fibrillation kinetics under various conditions, including the presence of metal ions.
Main Results:
- Methionine oxidation completely inhibits alpha-synuclein fibrillation by stabilizing soluble oligomers.
- Met-oxidized alpha-synuclein inhibits the fibrillation of unmodified alpha-synuclein in a dose-dependent manner.
- Environmental metal ions can overcome the inhibitory effect of methionine oxidation on fibrillation.
Conclusions:
- Oxidative stress, through methionine oxidation, can prevent alpha-synuclein aggregation.
- Environmental metal pollution may counteract this protective effect, potentially promoting Parkinson's disease.
- Methionine sulfoxide reductase (Msr) activity could influence Parkinson's disease risk by modulating Met-oxidized alpha-synuclein levels.