The effect of myoglobin crowding on the dynamics of water: an infrared study

Abstract : Solutions containing 8 and 32 wt% myoglobin are studied by means of infrared spectroscopy, as a function of temperature (290 K and lower temperatures), in the mid- and far-infrared spectral range. Moreover, ultrafast time-resolved infrared measurements are performed at ambient temperature in the O-D stretching region. The results evidence that the vibrational properties of water remain the same in these myoglobin solutions (anharmonicity, vibrational relaxation lifetime...) and in neat water. However, the collective properties of the water molecules are significantly affected by the presence of the protein: the orientational time increases, the solid-liquid transition is affected in the most concentrated solution and the dynamical transition of the protein is observed, from the point of view of water, even in the least concentrated solution, proving that the water and myoglobin dynamics are coupled.
Document type :
Journal articles
Complete list of metadatas

https://hal-cea.archives-ouvertes.fr/cea-01646439
Contributor : Serge Palacin <>
Submitted on : Thursday, November 23, 2017 - 2:55:38 PM
Last modification on : Tuesday, November 26, 2019 - 2:48:06 PM

Identifiers

Citation

S. Le Caër, G. Klein, D. Ortiz, M. Lima, S. Devineau, et al.. The effect of myoglobin crowding on the dynamics of water: an infrared study. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2014, 16 (41), pp.22841 - 22852. ⟨10.1039/C4CP03102D⟩. ⟨cea-01646439⟩

Share

Metrics

Record views

111