Ultrafast Dynamics of Water-Protein Coupled Motions Around the Surface of Eye Crystallin.

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ID: 87341
2020
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Abstract
Water dynamics on the protein surface mediate both protein structure and function. However, many questions remain about the role of the protein hydration layers in protein fluctuations and how the dynamics of these layers relate to specific protein properties. The fish eye lens protein γM7-crystallin (γM7) is found in vivo at extremely high concentrations nearing the packing limit, corresponding to only a few water layers between adjacent proteins. In this study, we conducted a site-specific probing of hydration water motions and sidechain dynamics at nine selected sites around the surface of γM7 using a tryptophan scan with femtosecond spectroscopy and NMR nuclear spin relaxation (NSR). We observed correlated fluctuations between hydration water and protein sidechains on a few and hundreds of picoseconds, corresponding to local reorientations and network restructuring, respectively. These motions are heterogenous over the protein surface and relate to the various steric and chemical properties of the local protein environment. Overall, we found that γM7 has relatively slower water dynamics within the hydration shell than a similar β-sheet protein, which may contribute to the high packing limit of this unique protein.
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houston2020ultrafastjournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Houston, Patrick;Macro, Nicolas;Kang, Minhee;Chen, Long;Yang, Jin;Wang, Lijuan;Wu, Zhengrong;Zhong, Dongping;
Journal Journal of the American Chemical Society
Year 2020
DOI
10.1021/jacs.9b13506
URL
Keywords
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