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We have studied complexations of functional nucleic acids and metal ions, by means of NMR spectroscopy. In the case of hammerhead ribozymes, they have a metal ion-binding motif in their core sequences. Upon the metallation of N7 of a guanosine in an RNA duplex modelled after hammerhead ribozymes, 20 ppm higher field shift of N7 was observed in 1-dimensional (1D) 15N NMR spectra. It was found that metal ion binding to nucleobases were detectable with 15N NMR spectroscopy.

NMR spectroscopic analyses of functional nucleic acids-metal interaction and their solution structure analyses