Abstract
Lactoperoxidase (LPO), eosinophil peroxidase (EPO) and myeloperoxidase (MPO) belong to the class of haloperoxidases, a group of mammalian enzymes able to catalyze the peroxidative oxidation of halides and pseudohalides, such as thiocyanate. They all play a key role in the development of antibacterial activity. The homology in their functional role is emphasized by the striking similarity of their primary structures. A theoretical model for the three-dimensional structure of LPO and EPO has been developed on the basis of the X-ray structure of MPO, a high degree of similarity having been found in their sequences. Evidence supporting the hypothesis of an ester linkage between heme and apoprotein in LPO and EPO, originally proposed by Hultquist and Morrison is discussed.
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