Figure 11.

Interactions of two SRL 2′-OD groups in a sugar orientation. (A) A54 and (B) G55. The color code matches that in Figure 3A, except for phosphate groups which are colored orange (P) and red (O). Residues are labeled, H atoms are colored in white and H-bonds are drawn with thin solid lines. The riboses of both A54 and G55 adopt the unusual C2′-endo pucker.