Paramagnetic NMR techniques allow for studying three-dimensional structures of RNA protein complexes. In particular, paratnagnetic relaxation enhancement (PRE) data can provide valuable information about long-range distances between different structural components. For PRE NMR experiments, oligonucleicitides are typically spin-labeled using nitroxide reagents. The current work describes an alternative approach involving a Cu(II) cyden-bas-O-cl probe that can be covalently attached to an RNA strand in the vicinity of the protein's binding site using "click".chemistry, The approach has been applied to study binding of HIV-1 nucleocapsid protein 7,(Ncp7) to a model RNA pentaiincleotide, 5'-ACQCU-3'. Coordination of the paramagnetic metal to &glutamic acid residue of NCp7 reduced flexibility of the probe, thus simplifying interpretation of the PRE data. NMR experiments showed attenuation of signal intensities from protein residues localized in proximity to the paramagnetic probe as the result of RNA protein interactions. The extent of the attenuation was related to the probe's proximity allowing us to construct the protein's contact surface map.