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Updated: Aug 11, 2026
04:37
High-Pressure NMR Experiments for Detecting Protein Low-Lying Conformational States
Published on: June 29, 2021
Pressure-dependent transition in protein dynamics at about revealed by molecular dynamics simulation
Lars Meinhold1, Jeremy C Smith
1Computational Molecular Biophysics, Interdisciplinary Center for Scientific Computing (IWR), University of Heidelberg, Im Neuenheimer Feld 368, D-69120 Heidelberg, Germany.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 21, 2006
Summary
High pressure alters protein dynamics. Molecular dynamics simulations show Staphylococcal nuclease internal motions change significantly above 4 kbar, with reduced large-amplitude protein modes and restricted solvent motion.
Area of Science:
- Biophysics
- Computational Biology
- Protein Dynamics
Background:
- Understanding protein behavior under varying environmental conditions, such as pressure, is crucial for molecular biology.
- Staphylococcal nuclease is a model crystalline protein system for studying pressure-induced effects.
Purpose of the Study:
- To investigate the impact of hydrostatic pressure on the internal dynamics of crystalline Staphylococcal nuclease.
- To identify pressure-induced changes in protein motion and their underlying mechanisms.
Main Methods:
- Utilized molecular dynamics (MD) simulations.
- Simulated Staphylococcal nuclease across a pressure range from 1 bar to 15 kbar.
- Analyzed mean-square displacement (
(P)) to quantify internal protein motion.
Main Results:
- A qualitative change in protein internal motions was observed around 4 kbar.
- The mean-square displacement exhibited two linear regimes, with a twofold decrease in slope above 4 kbar.
- Increasing pressure led to a loss of large-amplitude collective protein modes (< 2 THz) and restricted solvent motion.
Conclusions:
- Hydrostatic pressure significantly alters protein dynamics, affecting both internal protein motions and solvent interactions.
- The observed changes suggest a pressure-induced transition in the flexibility and collective dynamics of Staphylococcal nuclease.
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