Modulation of Alpha-Synuclein Aggregation by Dopamine Analogs

Date

2010-02-16

Author

LATAWİEC, Diane
Herrera, Fernando
Bek, Alpan
Losasso, Valeria
Candotti, Michela
Benetti, Federico
Carlino, Elvio
Kranjc, Agata
Lazzarino, Marco
Gustincich, Stefano
Carloni, Paolo
Legname, Giuseppe

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The action of dopamine on the aggregation of the unstructured alpha-synuclein (alpha-syn) protein may be linked to the pathogenesis of Parkinson's disease. Dopamine and its oxidation derivatives may inhibit alpha-syn aggregation by non-covalent binding. Exploiting this fact, we applied an integrated computational and experimental approach to find alternative ligands that might modulate the fibrillization of alpha-syn. Ligands structurally and electrostatically similar to dopamine were screened from an established library. Five analogs were selected for in vitro experimentation from the similarity ranked list of analogs. Molecular dynamics simulations showed they were, like dopamine, binding non-covalently to alpha-syn and, although much weaker than dopamine, they shared some of its binding properties. In vitro fibrillization assays were performed on these five dopamine analogs. Consistent with our predictions, analyses by atomic force and transmission electron microscopy revealed that all of the selected ligands affected the aggregation process, albeit to a varying and lesser extent than dopamine, used as the control ligand. The in silico/in vitro approach presented here emerges as a possible strategy for identifying ligands interfering with such a complex process as the fibrillization of an unstructured protein.

Subject Keywords

Catechols, Oligomerization, Fibrillation, Pathogenesis, Fibrillization, Binding, Inhibition, Lewy bodies, Molecular-dynamics, Parkinsons-disease

URI

https://hdl.handle.net/11511/42362

Collections

Department of Physics, Article