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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 1. Mechanisms for Regulation of Gene Expression by Purine Riboswitches.

Figure 1

(A) Schematic showing control of gene expression by the xpt G-riboswitch through transcriptional termination [23]. Highly conserved residues in the G-box of the aptamer domain are marked in red.

(B) Gene expression regulation by the ydhL A-riboswitch through disruption of the terminator hairpin [24].

(C) Control of gene expression by the add A-riboswitch most likely through translational activation. The Shine-Dalgarno GAA sequence and the initiation codon are both shaded in orange.