α-Synuclein Conformation Affects Its Tyrosine-Dependent Oxidative Aggregation
Oxidative stress and aggregation of the protein α-synuclein are thought to be key factors in Parkinson’s disease. Previous work shows that cytochrome c with H2O2 causes tyrosine-dependent in vitro peroxidative aggregation of proteins, including α-synuclein. Here, we examine the role of each of α-syn...
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Published in | Biochemistry (Easton) Vol. 47; no. 51; pp. 13604 - 13609 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
United States
American Chemical Society
23.12.2008
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Subjects | |
Online Access | Get full text |
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Summary: | Oxidative stress and aggregation of the protein α-synuclein are thought to be key factors in Parkinson’s disease. Previous work shows that cytochrome c with H2O2 causes tyrosine-dependent in vitro peroxidative aggregation of proteins, including α-synuclein. Here, we examine the role of each of α-synuclein’s four tyrosine residues and how the protein’s conformation affects covalent oxidative aggregation. When α-synuclein adopts a collapsed conformation, tyrosine 39 is essential for wild-type-like covalent aggregation. This lone N-terminal tyrosine, however, is not required for wild-type-like covalent aggregation in the presence of a denaturant or when α-synuclein is present in noncovalent fibrils. We also show that preformed oxidative aggregates are not incorporated into noncovalent fibrils. These data provide insight into how dityrosine may be formed in Lewy bodies seen in Parkinson’s disease. |
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Bibliography: | istex:66A2EF52FE7D73B71A1DAB3560858FCA6C2CF82A ark:/67375/TPS-V6ZNGWDQ-V |
ISSN: | 0006-2960 1520-4995 |
DOI: | 10.1021/bi801884z |