Kasinath, V., Fu, Y., Sharp, K. A. and Wand, A. J. (2015) A sharp thermal transition of fast aromatic-ring dynamics in ubiquitin. Angewandte Chemie (International Edition), 54(1), pp. 102-107. (doi: 10.1002/anie.201408220)
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Publisher's URL: http://dx.doi.org/10.1002/anie.201408220
Abstract
Aromatic amino acid side chains have a rich role within proteins and are often central to their structure and function. Suitable isotopic-labelling strategies enable studies of sub-nanosecond aromatic-ring dynamics using solution NMR relaxation methods. Surprisingly, it was found that the three aromatic side chains in human ubiquitin show a sharp thermal dynamical transition at approximately 312 K. Hydrostatic pressure has little effect on the low-temperature behavior, but somewhat decreases the amplitude of motion in the high-temperature regime. Therefore, below the transition temperature, ring motion is largely librational. Above this temperature, a complete ring-rotation process that is fully consistent with a continuous diffusion not requiring the transient creation of a large activated free volume occurs. Molecular dynamics simulations qualitatively corroborate this view and reinforce the notion that the dynamical character of the protein interior has much more liquid-alkane-like properties than previously appreciated.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Fu, Dr Yinan |
Authors: | Kasinath, V., Fu, Y., Sharp, K. A., and Wand, A. J. |
College/School: | College of Medical Veterinary and Life Sciences > School of Molecular Biosciences |
Journal Name: | Angewandte Chemie (International Edition) |
Journal Abbr.: | Angew Chem Int Ed Engl |
Publisher: | Wiley - V C H Verlag GmbH & Co. KGaA |
ISSN: | 1433-7851 |
ISSN (Online): | 1521-3773 |
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