Coupling constants again: Experimental restraints in structure refinement |
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Authors: | Dale F Mierke Thomas Huber Horst Kessler |
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Institution: | (1) Department of Chemistry, Clark University, 950 Main Street, 01610 Worcester, MA, U.S.A.;(2) Organisch Chemisches Institut, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany |
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Abstract: | Summary Utilization of coupling constants as restraints in computational structure refinement is reviewed. In addition, we address the effect of conformational averaging and examine different approaches to apply the restraints when the experimental observable is obviously a result of averaging. Here, two different computational methods are compared. The simulation of a single structure with time-dependent restraints produces results very similar to those obtained with the calculation of numerous copies of the molecule (an ensemble of structures) and ensemble averaging. The advantages and disadvantages of the two methods are illustrated with simulations of cyclosporin A, for which 117 NOEs and 62 homo- and heteronuclear coupling constants have been measured. |
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Keywords: | Structure refinement Coupling constant restraints Time-dependent restraints Ensemble averages |
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