Figure 4.

The crystal structure of PDO_KF1.A, cartoon representation of PDO_KF1 monomer with secondary structure elements (B) Cartoon representation of PDO_KF1 α₃α₃ hexamer; six subunits A, B, C, D, E, and F are colored in green, teal, blue, red, salmon, and orange respectively. C, residue Asp178 found at the subunit–subunit interface bridge the Rieske center to the catalytic mononuclear iron center. D, the coordination of the mononuclear iron center with residues and two water molecules. Residues and bond distances (in Å) are labeled. E, structural superposition of a PDO_KF1 protomer (red), DMO (gray), and CarDO (yellow). Extended region (residue 285–338) of the catalytic domain of PDO_KF1 are involved in α₃:α₃ stacking interactions.