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Diffusivelike Motions in a Solvent-Free Protein-Polymer Hybrid
Giorgio Schirò1, Yann Fichou2, Alex P S Brogan3
1Université Grenoble Alpes, CEA, CNRS, Institut de Biologie Structurale, F-38000 Grenoble, France.
Physical Review Letters
|March 12, 2021
Summary
Protein hydration water is crucial for flexibility. Solvent-free protein-polymer hybrids show that polymer dynamics can mimic water’s plasticizing effect, preserving protein structure and function.
Area of Science:
- Biophysics
- Materials Science
- Protein Dynamics
Background:
- Protein structure and function depend on interactions with hydration water.
- Water's translational motions are key to protein flexibility.
- Solvent-free protein-polymer hybrids offer a way to stabilize proteins without water.
Purpose of the Study:
- To investigate how polymers dynamically replace water in protein stabilization.
- To compare the effects of polymer coating versus hydration on protein dynamics.
Main Methods:
- Neutron scattering
- Protein and polymer perdeuteration
- Molecular dynamics simulations
Main Results:
- Polymer coating significantly modifies protein relaxation rates and vibrational properties compared to hydration.
- Liquid-like polymer dynamics exhibit a plasticizing effect on proteins.
- This plasticizing effect is qualitatively similar to that of hydration water.
Conclusions:
- Polymers can dynamically replace water's role in protein stabilization.
- Engineered protein-polymer interactions can maintain protein structure, function, and dynamics.
- This research provides insights into designing stable protein-based materials.
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