Self-processing of Peroxidases
The catalytic species of heme peroxidases is powerful enough to oxidize amino acids such as tyrosine and tryptophan. In some peroxidases, this oxidative ability is utilized to autocatalytically modify protein residues and/or the heme group to tailor the protein for its specific biological function. The transformations that are observed include modification of individual amino acids, crosslinking of amino acids, modification of the heme group, and crosslinking of the protein to the prosthetic heme group. These autocatalytic modifications are found in peroxidases that range from bacteria through humans.