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Measurement of four-bond HN-H alpha J-couplings in staphylococcal nuclease
1Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892.
Journal of Biomolecular NMR
|March 1, 1994
Abstract:
Quantitative J-correlation and triple-resonance ECOSY-type experiments are used to unambiguously establish the presence of four-bond sequential HN-H alpha J-couplings in the protein staphylococcal nuclease. Substantially negative 4JH alpha HN values, ranging from -0.8 to -2.3 Hz, are observed when the psi angle is near +120 degrees, and the following phi angle near +60 degrees. For other conformations, the four-bond HN-H alpha J-couplings fall between -0.5 and +0.5 Hz.