Molecular Basis of Small-Molecule Binding to α-Synuclein
Paul Robustelli1,2, Alain Ibanez-de-Opakua3, Cecily Campbell-Bezat1
1D. E. Shaw Research, New York, New York 10036, United States.
Journal of the American Chemical Society
|February 8, 2022
Summary
Molecular dynamics simulations reveal how the intrinsically disordered protein alpha-synuclein binds the drug fasudil. This approach may enable rational drug design for diseases linked to disordered proteins.
Area of Science:
- Biochemistry
- Computational Biology
- Pharmacology
Background:
- Intrinsically disordered proteins (IDPs) lack stable 3D structures, complicating drug design.
- Alpha-synuclein aggregation is linked to Parkinson's disease.
Purpose of the Study:
- To understand the atomic-level interactions between alpha-synuclein and the drug fasudil using molecular dynamics (MD) simulations.
- To explore the potential of MD simulations for designing drugs targeting IDPs.
Main Methods:
- Long-time-scale, atomic-level MD simulations of monomeric alpha-synuclein binding fasudil.
- Comparison of simulation results with experimental NMR chemical shift data.
- Further simulations with modified small molecules to validate binding predictions.
Main Results:
- MD simulations accurately reproduced known NMR data for alpha-synuclein-fasudil binding.
- Fasudil binding involved dynamic shuttling between charge-charge and π-stacking interactions near the C terminus.
- Subsequent NMR experiments confirmed binding affinities and structural features predicted by MD simulations.
Conclusions:
- MD simulations provide atomic-level insights into IDP-ligand interactions.
- The dynamic shuttling mechanism is key to fasudil binding alpha-synuclein.
- MD-based strategies show promise for rational drug design targeting intrinsically disordered proteins in diseases like Parkinson's.
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