Abstract
We study the dynamics of hydration water in the protein lysozyme in the temperature range 180K<T<360K using Fourier-transform-infrared and nuclear magnetic resonance (NMR) spectroscopies. By analyzing the thermal evolution of spectra of the OH-stretching vibration modes and the NMR self-diffusion (DS) and spin-lattice relaxation time (T1), we demonstrate the existence of two dynamical transitions in the protein hydration water. Below the first transition, at about 220K, the hydration water displays an unambiguous fragile-to-strong dynamic crossover, resulting in the loss of the protein conformational flexibility. Above the second transition, at about 346K, where the protein unfolds, the dynamics of the hydration water appears to be dominated by the non-hydrogen-bonded fraction of water molecules.
Bibliography
Mallamace, F., Chen, S.-H., Broccio, M., Corsaro, C., Crupi, V., Majolino, D., Venuti, V., Baglioni, P., Fratini, E., Vannucci, C., & Stanley, H. E. (2007). Role of the solvent in the dynamical transitions of proteins: The case of the lysozyme-water system. The Journal of Chemical Physics, 127(4).
Authors
11
- Francesco Mallamace (first)
- Sow-Hsin Chen (additional)
- Matteo Broccio (additional)
- Carmelo Corsaro (additional)
- Vincenza Crupi (additional)
- Domenico Majolino (additional)
- Valentina Venuti (additional)
- Piero Baglioni (additional)
- Emiliano Fratini (additional)
- Chiara Vannucci (additional)
- H. Eugene Stanley (additional)
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Dates
Type | When |
---|---|
Created | 18 years ago (July 31, 2007, 7:57 p.m.) |
Deposited | 2 years ago (Aug. 2, 2023, 4:18 a.m.) |
Indexed | 3 weeks, 4 days ago (July 30, 2025, 6:49 a.m.) |
Issued | 18 years ago (July 28, 2007) |
Published | 18 years ago (July 28, 2007) |
Published Online | 18 years ago (July 31, 2007) |
Published Print | 18 years ago (July 28, 2007) |
@article{Mallamace_2007, title={Role of the solvent in the dynamical transitions of proteins: The case of the lysozyme-water system}, volume={127}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.2757171}, DOI={10.1063/1.2757171}, number={4}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Mallamace, Francesco and Chen, Sow-Hsin and Broccio, Matteo and Corsaro, Carmelo and Crupi, Vincenza and Majolino, Domenico and Venuti, Valentina and Baglioni, Piero and Fratini, Emiliano and Vannucci, Chiara and Stanley, H. Eugene}, year={2007}, month=jul }