Abstract
An analysis is presented of experimental versus calculated chemical shifts of the non-exchangeable protons for 28 RNA structures deposited in the Protein Data Bank, covering a wide range of structural building blocks. We have used existing models for ring-current and magnetic-anisotropy contributions to calculate the proton chemical shifts from the structures. Two different parameter sets were tried: (i) parameters derived by Ribas-Prado and Giessner-Prettre (GP set) [(1981) J. Mol. Struct., 76, 81–92.]; (ii) parameters derived by Case [(1995) J. Biomol. NMR, 6, 341–346]. Both sets lead to similar results. The detailed analysis was carried using the GP set. The root-mean-square-deviation between the predicted and observed chemical shifts of the complete database is 0.16 ppm with a Pearson correlation coefficient of 0.79. For protons in the usually well-defined A-helix environment these numbers are, 0.08 ppm and 0.96, respectively. As a result of this good correspondence, a reliable analysis could be made of the structural dependencies of the 1H chemical shifts revealing their physical origin. For example, a down-field shift of either H2′ or H3′ or both indicates a high-syn/syn χ-angle. In an A-helix it is essentially the 5′-neighbor that affects the chemical shifts of H5, H6 and H8 protons. The H5, H6 and H8 resonances can therefore be assigned in an A-helix on the basis of their observed chemical shifts. In general, the chemical shifts were found to be quite sensitive to structural changes. We therefore propose that a comparison between calculated and observed 1H chemical shifts is a good tool for validation and refinement of structures derived from NOEs and J-couplings.
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Cromsigt, J.A., Hilbers, C.W. & Wijmenga, S.S. Prediction of proton chemical shifts in RNA – Their use in structure refinement and validation. J Biomol NMR 21, 11–29 (2001). https://doi.org/10.1023/A:1011914132531
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DOI: https://doi.org/10.1023/A:1011914132531