FIGURE 6.
Structure of the recognition bulge. (A) Stereo view of the recognition bulge in the same orientation as in Figure 3A. (B) Molecular surface depiction of the image in A. (C) Stereo view of the molecular surface from the top of the aptamer, rotated 90° counterclockwise relative to B. (D) Stereo view with G15 and G16 in stick form. The GTP triphosphate is removed for clarity. The residues are numbered and colored consistently in A–D. The GTP ribose is green. The GTP triphosphate is black. The GTP nucleobase is blue, except in D, where CPK coloring is used.
