Oxidative Dimer Formation Is the Critical Rate-Limiting Step for Parkinson's Disease α-Synuclein Fibrillogenesis†
- Sampathkumar Krishnan
- ,
- Eva Y. Chi
- ,
- Stephen J. Wood
- ,
- Brent S. Kendrick
- ,
- Cynthia Li
- ,
- William Garzon-Rodriguez
- ,
- Jette Wypych
- ,
- Theodore W. Randolph
- ,
- Linda O. Narhi
- ,
- Anja Leona Biere
- ,
- Martin Citron
- , and
- John F. Carpenter
Abstract
Intraneuronal deposition of α-synuclein as fibrils and oxidative stress are both implicated in the pathogenesis of Parkinson's disease. We found that the critical rate-limiting step in nucleation of α-synuclein fibrils under physiological conditions is the oxidative formation and accumulation of a dimeric, dityrosine cross-linked prenucleus. Dimer formation is accelerated for the pathogenic A30P and A53T mutant α-synucleins, because of their greater propensity to self-interact, which is reflected in the smaller values of the osmotic second virial coefficient compared to that of wild-type synuclein. Our finding that oxidation is an essential step in α-synuclein aggregation supports a mechanism of Parkinson's disease pathogenesis in which the separately studied pathogenic factors of oxidative stress and α-synuclein aggregation converge at the critical step of α-synuclein dimer formation.
†
Supported by National Science Foundation Grant BES 0138595 to J.F.C. and T.W.R.
‡
University of Colorado Health Sciences Center.
§
University of Colorado.
‖
Amgen, Inc.
*
To whom correspondence should be addressed: Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Health Sciences Center, Denver, CO 80262. Phone: (303) 315-6074. Fax: (303) 315-6281. E-mail: [email protected].
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