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Slow Dynamics around a Protein and Its Coupling to Solvent
Yun-Hsuan Kuo1, Yun-Wei Chiang1
1Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan.
ACS Central Science
|May 29, 2018
Summary
Solvent dynamics influence protein function, with saturation transfer electron spin resonance (ST-ESR) revealing coupled protein-solvent motion at exposed sites below the solvent's liquid-liquid transition temperature.
Area of Science:
- Biophysics
- Protein Dynamics
- Biomolecular Interactions
Background:
- Solvent's role in protein dynamics and function is crucial but debated.
- Understanding protein dynamics across various timescales is essential for function.
- Subfreezing temperatures offer a unique window into protein-solvent interactions.
Purpose of the Study:
- To investigate the influence of solvent dynamics on protein dynamics using ST-ESR.
- To characterize protein surface dynamics at subfreezing temperatures (180-240 K).
- To map site-specific dynamics around a protein in glycerol/water mixtures.
Main Methods:
- Saturation Transfer Electron Spin Resonance (ST-ESR) spectroscopy.
- Utilizing four different spin probes for site-specific analysis.
- Studying protein dynamics in 10 mol% glycerol/water mixtures at subfreezing temperatures.
Main Results:
- ST-ESR reliably detects dynamical changeovers, correlating with the solvent's liquid-liquid transition (LLT).
- Protein and solvent dynamics are coupled at highly exposed sites below the LLT temperature (~190 K).
- Distinct protein dynamics, independent of bulk solvent, observed at less exposed sites across temperatures.
Conclusions:
- Protein dynamics are influenced by solvent properties, particularly below the LLT.
- Different dynamic components (structural fluctuation, rotamer, side-chain) dominate at varying temperatures.
- Bulk solvent plasticizes proteins, facilitating rather than restricting protein dynamics.
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