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Updated: Jun 5, 2025
11:57
Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans
Published on: November 26, 2017
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Sequence complexity and monomer rigidity control the morphologies and aging dynamics of protein aggregates
Ryota Takaki1, D Thirumalai2,3
1Max Planck Institute for the Physics of Complex Systems, Dresden 01187, Germany.
Summary
Monomer flexibility and sequence complexity control protein aggregate structure and dynamics. Increased rigidity can transform liquid-like droplets into amyloid-like fibrils, impacting disease research.
Area of Science:
- Biophysics
- Computational Biology
- Molecular Biology
Background:
- Protein aggregation is linked to misfolding diseases.
- Aggregate morphology is known, but formation dynamics are less understood.
Purpose of the Study:
- To model how monomer structural and sequence features influence protein aggregation dynamics and morphology.
- To investigate the role of sequence complexity and monomer rigidity.
Main Methods:
- Developed a minimal model for protein aggregation.
- Utilized simulations to explore parameter space.
- Analyzed aggregate dynamics and morphology based on sequence complexity and rigidity.
Main Results:
- Low sequence complexity and flexible monomers form ergodic, liquid-like droplets.
- Increased monomer rigidity induces a transition to ordered, amyloid-like structures.
- High sequence complexity monomers form amorphous aggregates with nonergodic glassy dynamics.
- Aggregate dynamics exhibit stretched exponential kinetics and aging at nonzero bending rigidities.
Conclusions:
- Monomer characteristics significantly shape protein aggregate morphology and dynamics.
- Findings offer insights into protein condensate aging and general aggregation rules.
- Distinguishes behavior between protein and RNA repeat sequences.
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