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Structural characterization of CcP S-Trp. (a) Replacement of Trp51 with S-Trp disrupts a hydrogen bond to the ferryl oxygen of CpdI and CpdII. (b) Overlay of CcP (PDB code: 2CYP, gray)28 and CcP S-Trp (PDB code: 6Y1T, cyan) active sites. The heme cofactor and key residues are shown as atom-colored ball-and-sticks.
