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Assessment of molecular structure using frame-independent orientational restraints derived from residual dipolar couplings

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Abstract

Residual dipolar couplings measured in weakly aligning liquid-crystalline solvent contain valuable information on the structure of biomolecules in solution. Here we demonstrate that dipolar couplings (DCs) can be used to derive a comprehensive set of pairwise angular restraints that do not depend on the orientation of the alignment tensor principal axes. These restraints can be used to assess the agreement between a trial protein structure and a set of experimental dipolar couplings by means of a graphic representation termed a `DC consistency map'. Importantly, these maps can be used to recognize structural elements consistent with the experimental DC data and to identify structural parameters that require further refinement, which could prove important for the success of DC-based structure calculations. This approach is illustrated for the 42 kDa maltodextrin-binding protein.

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Authors and Affiliations

  1. Protein Engineering Network Centers of Excellence and Departments of Medical Genetics, Biochemistry and Chemistry, University of Toronto, Toronto, ON, Canada, M5S 1A8

    Nikolai R. Skrynnikov & Lewis E. Kay

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  1. Nikolai R. Skrynnikov
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  2. Lewis E. Kay
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Skrynnikov, N.R., Kay, L.E. Assessment of molecular structure using frame-independent orientational restraints derived from residual dipolar couplings. J Biomol NMR 18, 239–252 (2000). https://doi.org/10.1023/A:1026501101716

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