Abstract
It is demonstrated that the spatial proximity of 1H nuclei in hydrogen bonded base-pairs in RNAs can be conveniently mapped via magic angle spinning solid state NMR experiments involving proton spin diffusion driven chemical shift correlation of low gamma nuclei such as the imino and amino nitrogens of nucleic acid bases. As different canonical and non-canonical base-pairing schemes encountered in nucleic acids are characterised by topologically different networks of proton dipolar couplings, different base-pairing schemes lead to characteristic cross-peak intensity patterns in such correlation spectra. The method was employed in a study of a 100 kDa RNA composed of 97 CUG repeats, or (CUG)97 that has been implicated in the neuromuscular disease myotonic dystrophy. 15N−15N chemical shift correlation studies confirm the presence of Watson–Crick GC base pairs in (CUG)97.
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Riedel, K., Leppert, J., Ohlenschläger, O. et al. Characterisation of hydrogen bonding networks in RNAs via magic angle spinning solid state NMR spectroscopy. J Biomol NMR 31, 331–336 (2005). https://doi.org/10.1007/s10858-005-1614-6
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DOI: https://doi.org/10.1007/s10858-005-1614-6