Figure 5 - full size

Figure 5. Structural comparison of the AUCGCA loop of APT15 and the stem-loop IIa in yeast U2 snRNA. (A) The AUCGCA loop structure in APT15. (B) The GUAACA loop structure in loop IIa of U2 snRNA (38). Schematic representations of the (C) AUCGCA loop structure and (D) GUAACA loop structure are shown. In the schematic representations, symbols are used as follows: black rectangle, anti base; open rectangle, syn base; red rectangle, stacking interaction; blue circle, hydrogen bonding interaction; open circle, C3'-endo ribose; open square, C2'-endo ribose.

The above figure is reprinted from an Open Access publication published by Oxford University Press: Nucleic Acids Res (2005, 33, 745-754) copyright 2005.