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X-ray crystal structure of ternary complex between Fe-HPCD, O2, and 4-nitrocatechol, based on the structure of Kovaleva et al. (7), PDB ID code 2IGA chain C. O2 appears bound in a side-on conformation with an H bond from the conserved His200. 4-Nitrocatechol coordinates trans to the two His ligands. Also see ref. 11. This figure was generated by using PyMOL (12).
