Structure of the SAM-II riboswitch bound to S-adenosylmethionine
Structure of the SAM-II riboswitch bound to S-adenosylmethionine
Structure of the SAM-II riboswitch bound to S-adenosylmethionine
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Supplementary Figure 3 Electron density maps around <strong>the</strong> <strong>SAM</strong> binding site<br />
pro<strong>to</strong>mer A <strong>of</strong> <strong>the</strong> <strong>SAM</strong>-<strong>II</strong> <strong>riboswitch</strong> con<strong>to</strong>ured at 1σ (orange cage). The final<br />
model is superimposed upon <strong>the</strong> density (green, RNA; magenta, <strong>SAM</strong>). (a) Solvent<br />
flattened experimental electron density map. (b) Final 2Fo-Fc electron density map.<br />
(c, next page) Final 2Fo-Fc electron density map in wall-eyed stereo. Image is<br />
centered on <strong>the</strong> P1-P2b junction and shows <strong>the</strong> location <strong>of</strong> a cesium a<strong>to</strong>m (purple)<br />
<strong>bound</strong> <strong>to</strong> an engineered phasing module in <strong>the</strong> RNA.