Abstract
HYDRONMR is an implementation of state of the art hydrodynamic modeling to calculate the spectral density functions for NH or Cα-H vectors in a rigid protein structure starting from an atomic level representation. Thus HYDRONMR can be used to predict NMR relaxation times from a rigid model and to compare them with the experimental results. HYDRONMR contains a single adjustable parameter, the atomic element radius. A protocol to determine the value that gives the best agreement between calculated and experimental T1/T2values is described. For most proteins, the value of the atomic element radius ranges between 2.8 Å and 3.8 Å with a distribution centered at 3.3 Å. Deviations from the usual range towards larger values are associated to aggregation in several proteins. Deviations to lower values may be related to large-scale motions or inappropriate model structures.
If the average structure is correct, deviations between experimental T1/T2values and those calculated with HYDRONMR can be used to distinguish residues affected by anisotropic motion from those that are involved in chemical exchange.
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Bernadó, P., de la Torre, J.G. & Pons, M. Interpretation of 15N NMR relaxation data of globular proteins using hydrodynamic calculations with HYDRONMR. J Biomol NMR 23, 139–150 (2002). https://doi.org/10.1023/A:1016359412284
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DOI: https://doi.org/10.1023/A:1016359412284