Elucidating the Role of Site-Specific Nitration of α-Synuclein in the Pathogenesis of Parkinson's Disease via Protein Semisynthesis and Mutagenesis

Journal of the American Chemical Society
Ritwik BuraiHilal A Lashuel

Abstract

Parkinson's disease (PD) is characterized by the loss of dopaminergic neurons in the substantia nigra and the presence of intraneuronal inclusions consisting of aggregated and post-translationally modified α-synuclein (α-syn). Despite advances in the chemical synthesis of α-syn and other proteins, the generation of site-specifically nitrated synthetic proteins has not been reported. Consequently, it has not been possible to determine the roles of nitration at specific residues in regulating the physiological and pathogenic properties of α-syn. Here we report, for the first time, the site-specific incorporation of 3-nitrotyrosine at different regions of α-syn using native chemical ligation combined with a novel desulfurization strategy. This strategy enabled us to investigate the role of nitration at single or multiple tyrosine residues in regulating α-syn structure, membrane binding, oligomerization, and fibrils formation. We demonstrate that different site-specifically nitrated α-syn species exhibit distinct structural and aggregation properties and exhibit reduced affinity to negatively charged vesicle membranes. We provide evidence that intermolecular interactions between the N- and C-terminal regions of α-syn play critical ...Continue Reading

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