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Z-like steps establishing long-range contacts in a tRNA like system (TLS) and a fluoride riboswitch (symmetry contact). The nucleotides forming a Watson–Crick pair with the 5′-nucleotide of the Z-like step are shown in wheat. (A) TLS structure (PDB: 4P5J; res: 2.0 Å). (B) Fluoride riboswitch (PDB: 4ENC; res: 2.3 Ǻ). The symmetry related molecule is shown in light blue; asterisks mark annotations for this molecule.
