FIGURE 4.

Superposition of crystal structures of Kt-7. The structure of Kt-7 from the complex with L7Ae (PDB:4BW0) is shown in our standard coloring. The structures are viewed from the side of the bulged strand. The images are shown in parallel-eye stereo. (A) Superimposition with the structure of Kt-7 as a protein-free duplex colored cyan (PDB:4C40). The RMSD between the two structures is 0.83 Å. (B) Superimposition with the structure of Kt-7 inserted into the SAM-I riboswitch (Daldrop and Lilley 2013) colored orange (PDB:4B5R). The RMSD between the two structures is 1.13 Å. Note that all three Kt-7 structures are in the N3 conformation.