Pressure Dependence of the Dynamic Crossover Temperatures in Protein and its Hydration Water

Details Pressure Dependence of the Dynamic Crossover Temperatures in Protein and its Hydration Water Pressure Dependence of the Dynamic Crossover Temperatures in Protein and its Hydration Water

2008-10-07

arxiv.org/abs/0810.1228v1

Physics

Biological Physics

4 pages, 4 figures

Scientific paper

Recently we have shown experimental evidence for a fragile-to-strong dynamic crossover (FSC) phenomenon in hydration water around a globular protein (lysozyme) at ambient pressure. In this letter we show that when applying pressure to the protein-water system, the FSC crossover temperatures in hydration water of lysozyme tracks the similar Widom line emanating from the existence of a liquid-liquid critical point in a 1-D confined water (in MCM-41-S). The mean squared displacements (MSD) of hydrogen atoms in lysozyme and in its hydration water show a sudden change of slopes at the same characteristic temperature, which decreases with an increasing pressure. These results taken together give support of the idea that the dynamic crossover (or so-called glass transition) of the protein is a function of both temperature and pressure, following the FSC of its hydration water.

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