Spectrum of Slow and Super-Slow (Picosecond to Nanosecond) Water Dynamics around Organic and Biological Solutes

Water dynamics in the solvation shell of solutes plays a very important role in the interaction of biomolecules and in chemical reaction dynamics. However, a selective spectroscopic study of the solvation shell is difficult because of the interference of the solute dynamics. Here we report on the ob...

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Published inThe journal of physical chemistry letters Vol. 8; no. 13; pp. 2964 - 2970
Main Authors Ramakrishnan, Gopakumar, González-Jiménez, Mario, Lapthorn, Adrian J, Wynne, Klaas
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 06.07.2017
Subjects
Hydrophobic and Hydrophilic Interactions
Nuclear Magnetic Resonance, Biomolecular
Proteins - chemistry
Water - chemistry
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Summary:Water dynamics in the solvation shell of solutes plays a very important role in the interaction of biomolecules and in chemical reaction dynamics. However, a selective spectroscopic study of the solvation shell is difficult because of the interference of the solute dynamics. Here we report on the observation of heavily slowed down water dynamics in the solvation shell of different solutes by measuring the low-frequency spectrum of solvation water, free from the contribution of the solute. A slowdown factor of ∼50 is observed even for relatively low concentrations of the solute. We go on to show that the effect can be generalized to different solutes including proteins.
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ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.7b01127