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The 3D and secondary structures of two internal loops in a 16S rRNA and a TPP riboswitch. (A) The 3D structure of the internal loop in the 16S rRNA (PDB ID: 1FJG, chain: A). (B) The secondary structure of the loop in (A). (C) The 3D structure of the internal loop in the TPP riboswitch (PDB ID: 2GDI, chain Y). (D) The secondary structure of the loop in (C). In (A–D), the nucleotides with binding activities are marked in red.
