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Active site environment of FeHPCD in complex with the optimal substrate HPCA (PDB 4GHG, subunit C). Atom color code: gray, carbon (enzyme); yellow, carbon (substrate); blue, nitrogen; red, oxygen; bronze, iron. Red dashed lines show hydrogen bonds (Å). Gray dashed lines indicate bonds or potential bonds to iron (Å). Additional distances are given in Table S3. The cartoon depicts the secondary structure elements.
