Fig. 4: The structures of the loop-turns in the core of the PK hammerhead and pistol ribozymes.
From: The structure and catalytic mechanism of a pseudoknot-containing hammerhead ribozyme
Parallel-eye stereoscopic views are presented. A The turn of the PK hammerhead ribozyme from A2.1 to G8. Note that G8 lies within the center of the loop, base paired to C3. B The turn of the pistol ribozyme from U29 to G32. In contrast to G8 in the PK hammerhead ribozyme structure, G32 is reoriented and directed away from the loop on the minor groove side. This image was generated from PDB ID 6R4723.
