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. Author manuscript; available in PMC: 2015 Dec 28.
Published in final edited form as: Chem Biol. 2004 Dec;11(12):1729–1741. doi: 10.1016/j.chembiol.2004.11.018

Figure 7. Recognition of Bound Purines in Purine Riboswitches.

Figure 7

(A) Hydrogen-bonding alignments to bound adenine in the A-riboswitch. The bound adenine forms a Watson-Crick pair with U74. (B) Hydrogen-bonding alignments to bound guanine in the G-riboswitch. The bound guanine forms a Watson-Crick pair with C74. Hydrogen bonds involving 2′-OH of U22 and base edges of U47 and U51 are common to both riboswitches. Oxygen, nitrogen, and phosphorus atoms are shown, respectively, as red, blue, and yellow balls.