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A water mediated hydrogen bond encodes edge recognition of cognate base-pair shapes. (A) C•A cognate shape mimic (Mn2+, magenta); (B) C•A wobble (Mg2+, green); (C) T•A; (D) A•T; (E) G•C; (F) C•G (from previously published structure; PDB code, 2HVI) (34). Composite omit maps (gray) at 1.5σ (A), (C–E) and 1.2σ (B) are shown around the base pairs and the anchored water molecule. Dashed lines (black) indicate hydrogen bonds.
