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Protein Side-Chain Dynamics Observed by Solution- and Solid-State NMR:  Comparative Analysis of Methyl 2H Relaxation Data

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journal contribution
posted on 27.09.2006, 00:00 by Bernd Reif, Yi Xue, Vipin Agarwal, Maria S. Pavlova, Maggy Hologne, Anne Diehl, Yaroslav E. Ryabov, Nikolai R. Skrynnikov
Rapid advances in solid-state MAS NMR made it possible to probe protein dynamics on a per-residue basis, similar to solution experiments. In this work we compare methyl 2H relaxation rates measured in the solid and liquid samples of α-spectrin SH3 domain. The solution data are treated using a model-free approach to separate the contributions from the overall molecular tumbling and fast internal motion. The latter part forms the basis for comparison with the solid-state data. Although the accuracy of solid-state measurements is limited by deuterium spin diffusion, the results suggest a significant similarity between methyl dynamics in the two samples. This is a potentially important observation, preparing the ground for combined analysis of the dynamics data by solid- and solution-state NMR.