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. 2014 May 12;111(21):7659–7664. doi: 10.1073/pnas.1322248111

Fig. 2.

Fig. 2.

Different views of the structure of the CP and wild-type forms of the DirLC ribozyme. (A–C) Three different views rotated by 90° clockwise on the vertical axis. (B) DirLC is represented according to the orientation used for group I introns with P9 in the upper right corner and P15 (equivalent to the P1 and P2 stems in group I ribozymes) in the lower left corner. (D) Rotation of DirLC from B rotated by 90° on a horizontal axis shows the signet ring shape resulting from the orientation of P4–P6 and DP2–DP2.1 domains. Discontinuities in the backbone are due to the absence of some residues in electron density maps. (E and F) Weighted electron-density maps of a representative region corresponding to the P15 loop contoured at 1.0 σ for the 2.5-Å (E) and 3.85-Å (F) resolution crystal structures. Statistics on data collection and refinement are summarized in Table S1.