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. 2022 Jul 12;50(13):7721–7738. doi: 10.1093/nar/gkac577

Figure 4.

Figure 4.

Pairing motifs in two adjacent layers of the SRL RNA stem. Foreground: The G55•U56•A65 base triple. Background: The sheared A57•G64 pair. G55 and G64 engage in a cross-strand stack. The hydrogen atoms on their respective C8 atoms have been partially exchanged for deuterium. The color code is identical to that in Figure 3A, H-bonds are drawn with thin solid lines and residues are labeled. Note the H-bonding interactions between N1D and N2(D)2 of G64 and the phosphate of U56 (top) and 2′-OD of G64 and O4′ of A65 (bottom, slightly obscured).