Abstract
For base-paired nucleic acids, variations in 1JNH and the imino 1H chemical shift are both dominated by hydrogen bond length. In the absence of molecular alignment, the 1JNH coupling for the imino proton then can be approximated by 1JNH = (1.21Hz/ppm)δH − 103.5 ± 0.6 Hz, where δH represents the chemical shift of the imino proton in ppm. This relation permits imino residual dipolar couplings (RDCs) resulting from magnetic susceptibility anisotropy (MSA) to be extracted from measurement of (1JNH + RDC) splittings at a single magnetic field strength. Magnetic field-induced RDCs were measured for tRNAVal and the alignment tensor determined from magnetic-field alignment of tRNAVal agrees well with the tensor calculated by summation of the MSA tensors of the individual nucleobases.
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Acknowledgement
This work was supported in part by the Intramural Research Program of the NIDDK, NIH, and by the Intramural AIDS-Targeted Antiviral Program of the Office of the Director, NIH, and NIH grant AI33098 (AP); MPL was supported in part by an NIH Training Grant T32 GM65103. We thank Dr. Sam E. Butcher and Dipa Sashital for providing us with the15N-enriched U2-U6 sample.
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Jinfa Ying, Alexander Grishaev and Michael P. Latham contributed equally to this work.
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Ying, J., Grishaev, A., Latham, M.P. et al. Magnetic field induced residual dipolar couplings of imino groups in nucleic acids from measurements at a single magnetic field. J Biomol NMR 39, 91–96 (2007). https://doi.org/10.1007/s10858-007-9181-7
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DOI: https://doi.org/10.1007/s10858-007-9181-7