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- W2326197669 abstract "The formation of amyloid fibrils of α-synuclein (αSyn), the key protein in Parkinson's disease, is an autocatalytic process that is seeded by mature αSyn fibrils. Based on systematic measurements of the dependence of the fibril growth rate on the concentrations of monomers and preformed fibrillar seeds, we propose a mechanism of αSyn aggregation that includes monomer binding to fibril ends and secondary nucleation by fibril breaking. The model explains the increase of the αSyn aggregation rate under shaking conditions and the exponential increase in the fraction of fibrillar protein at the initial stages of αSyn aggregation. The proposed autocatalytic mechanism also accounts for the high variability in the aggregation lag time. The rate constant of monomer binding to the ends of fibrils, k+ ≈ 1.3 mM(-1) s(-1), was estimated from the aggregation rate and previously reported average fibril lengths. From the aggregation rates at low concentrations the binding of monomeric αSyn to fibrils was found to be almost irreversible, with an equilibrium dissociation constant (Kd) smaller than 3 μM." @default.
- W2326197669 created "2016-06-24" @default.
- W2326197669 creator A5049383907 @default.
- W2326197669 creator A5062152061 @default.
- W2326197669 creator A5070219629 @default.
- W2326197669 date "2015-01-27" @default.
- W2326197669 modified "2023-10-11" @default.
- W2326197669 title "Fibril Breaking Accelerates α-Synuclein Fibrillization" @default.
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- W2326197669 doi "https://doi.org/10.1021/jp5111604" @default.
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