Nucleolin Recognition Element (NRE)
RNA free and bound

P. Bouvet, F. H. T. Allain, L.D. Finger, T. Dieckmann, and J. Feigon: "Recognition of pre-formed and flexible elements of an RNA stem-loop by nucleolin", J. Mol. Biol. 309, 763-775 (2001). [abstract]

The free sNRE (left) and the sNRE-RBD12 complex (right) with the protein ribbon of the lowest-energy structure of the complex displayed.