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Top, A. ornata DHP A (Protein Data Bank code 2QFK (13)) and DHP B (Protein Data Bank code 3IXF (14)). The heme group, the proximal and distal histidines (His-89 and His-55), and all tyrosines of the enzymes are shown. The distal His-55 is shown in the closed conformation. Note that Tyr-34 (DHP A) is not present in DHP B. Bottom, schematic representation of the dehaloperoxidase reaction (note: ferryl oxygen atoms are omitted for clarity). DXQ, dihaloquinone; TXP, trihalophenol.
