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Issue 24, 2014
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One role of hydration water in proteins: key to the “softening” of short time intraprotein collective vibrations of a specific length scale

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Abstract

High resolution inelastic X-ray scattering (IXS) experiments show that the “phonon energy softening” and “phonon population enhancement” observed in a hydrated native protein when increasing the temperature from 200 K to physiological temperature are not directly related to the protein structure. Such phenomena were also observed in a denatured sample without a defined tertiary structure and with a limited residual secondary structure. However, in a dry sample, such “softening” is strongly suppressed. These facts suggest that the above-mentioned protein “softening” phenomenon is water-induced. In addition, increasing the hydration level can also induce “phonon energy softening” at room temperature, but not at 200 K. This change may be due to a qualitative difference in the dynamics of hydration water at 200 K and at room temperature.

Graphical abstract: One role of hydration water in proteins: key to the “softening” of short time intraprotein collective vibrations of a specific length scale

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Publication details

The article was received on 03 Feb 2014, accepted on 28 Mar 2014 and first published on 31 Mar 2014


Article type: Paper
DOI: 10.1039/C4SM00257A
Citation: Soft Matter, 2014,10, 4298-4303
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    One role of hydration water in proteins: key to the “softening” of short time intraprotein collective vibrations of a specific length scale

    Z. Wang, W. Chiang, P. Le, E. Fratini, M. Li, A. Alatas, P. Baglioni and S. Chen, Soft Matter, 2014, 10, 4298
    DOI: 10.1039/C4SM00257A

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