Abstract
A method of NMR spectroscopy which involves the computation of magnetic shielding constants from xyz coordinates, taking into consideration the contribution to shielding from ring current fields, the diamagnetic and paramagnetic components of the atomic magnetic anisotropy, is presented to solve the solution spatial configuration of single stranded and double helical nucleic acids. It is shown that the CCA terminus of tRNA in solution assumes a structure very much different from its crystal structure. However, for the double helical poly(dG-dC)-poly(dG-dC) in high salt solution, the observed structure shows eminent agreement with the left-handed Z-DNA proposed from single crystal structural studies.
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