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Crystallographic structure of (A) VcCDA in the unliganded form (free enzyme with Zn2+ and acetate); (B) Binary complexes with DP2; and (C) DP3 ligands; (D) Superimposition of the three structures. Loop 4 (brown) has different conformations; (E) Magnification of the active site Loop 4 in the unliganded form (blue), and in enzyme–substrate complexes with DP2 (yellow) and DP3 (red) ligands. Only the DP2 ligand is shown.
