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. 2017 Nov 20;45(22):12638–12647. doi: 10.1093/nar/gkx1058

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© The Author(s) 2017. Published by Oxford University Press on behalf of Nucleic Acids Research.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 3. — Refinement of B. cereus fluoride riboswitch aptamer based on NMR imino-NOE constraints. (A) Secondary structure of a Bacillus cereus fluoride riboswitch. (B) NMR ¹H–¹H NOESY spectrum of fluoride-bound B. cereus riboswitch. (C) NMR J_NN-COSY spectrum of fluoride-bound B. cereus riboswitch. (D) Crystal structure of the T. petrophila fluoride riboswitch (PDB ID: 4ENC) in gray aligned with lowest energy iFoldNMR model of B. Cereus fluoride riboswitch aptamer. (E) Crystal structure aligned with structural model constrained by secondary structure information only. (F) A5-U35 reverse Watson–Crick base pair. (G) A37-U45 reverse Hoogsteen base pair.