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Issue 41, 2014
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The effect of myoglobin crowding on the dynamics of water: an infrared study

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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.

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

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Article information


Submitted
15 Jul 2014
Accepted
10 Sep 2014
First published
12 Sep 2014

Phys. Chem. Chem. Phys., 2014,16, 22841-22852
Article type
Paper
Author version available

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

S. Le Caër, G. Klein, D. Ortiz, M. Lima, S. Devineau, S. Pin, J.-B. Brubach, P. Roy, S. Pommeret, W. Leibl, R. Righini and J. P. Renault, Phys. Chem. Chem. Phys., 2014, 16, 22841
DOI: 10.1039/C4CP03102D

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