Abstract
The concept of self-consistent J coupling evaluation exploits redundant structure information inherent in large sets of 3J coupling constants. Application to the protein Desulfovibrio vulgaris flavodoxin demonstrates the simultaneous refinement of torsion-angle values and related Karplus coefficients. The experimental basis includes quantitative coupling constants related to the polypeptide backbone φ torsion originating from a variety of heteronuclear 2D and 3D NMR correlation experiments, totalling 124 3J(HN,Hα), 129 3J(HN,C′), 121 3J(HN,Cβ), 128 3J(C′i−1,Hαi), 121 3J(C′i−1,C′i), and 122 3J(C′i−1,Cβi). Without prior knowledge from either X-ray crystallography or NMR data, such as NOE distance constraints, accurate φ dihedral angles are specified for 122 non-glycine and non-proline residues out of a total of 147 amino acids. Different models of molecular internal mobility are considered. The Karplus coefficients obtained are applicable to the conformational analysis of φ torsions in other polypeptides.
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Schmidt, J.M., Blümel, M., Löhr, F. et al. Self-consistent 3J coupling analysis for the joint calibration of Karplus coefficients and evaluation of torsion angles. J Biomol NMR 14, 1–12 (1999). https://doi.org/10.1023/A:1008345303942
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DOI: https://doi.org/10.1023/A:1008345303942