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Molecular dynamics simulations of polyglutamine aggregation using solvent-free multiscale coarse-grained models.
1Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 55 East Zhongguancun Road, Beijing, 100190 China.
The Journal of Physical Chemistry. B
|June 17, 2010
Summary
Multiscale coarse-graining (MS-CG) models enable studying polyglutamine self-assembly at high concentrations. These models reveal distinct monomer behaviors and aggregation dynamics, aligning with experimental findings.
Area of Science:
- Computational chemistry
- Biophysics
- Materials science
Background:
- Polyglutamine peptides are implicated in neurodegenerative diseases.
- Understanding their self-assembly is crucial for disease mechanism insights.
- All-atom simulations face limitations in studying aggregation at relevant concentrations.
Purpose of the Study:
- To develop and apply solvent-free coarse-grained (CG) models for polyglutamine peptides.
- To investigate the self-assembly and aggregation behavior of polyglutamines at high concentrations.
- To bridge the gap between simulation capabilities and experimental observations.
Main Methods:
- Multiscale coarse-graining (MS-CG) method for model construction.
- Development of solvent-free CG models for polyglutamine peptides of varying lengths.
- Molecular dynamics (MD) simulations with enhanced equilibration and statistical sampling.
Main Results:
- Polyglutamine monomers (< or = 28 residues) fluctuate between folded and unfolded states.
- Monomers (>= 32 residues) form stable alpha-helix solid structures.
- Aggregation and fluctuation increase with concentration and chain length, showing heterogeneous and homogeneous configurations.
Conclusions:
- MS-CG models provide unprecedented insights into polyglutamine self-assembly.
- Simulation results are consistent with experimental observations of weak inter-molecular interactions.
- Solvent-free MS-CG models enable simulations of polypeptide self-assembly and aggregation beyond all-atom capabilities.
