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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: Wiley Interdiscip Rev RNA. 2011 Sep 28;3(3):369–384. doi: 10.1002/wrna.114

Figure 3.

Figure 3

Cartoon and ball-and-stick diagrams of the metX SAM-II riboswitch from the Sargasso Sea metagenome. (a) Cartoon depicting the tertiary structure of the SAM-II riboswitch in the bound state. The coordinates are from PDB entry 2QWY. (b) Ball-and-stick diagram of the structure in (a) showing interactions with SAM; red dashed lines indicate putative electrostatic interactions. (c) Close up view of the interaction between A19 and A47 showing the potential for chemical modification. (See the text for details).