Catalytic activity:Cl (-) + H (2) O (2) = HOCl + 2 H (2) O. ,Catalytic activity:Donor + H (2) O (2) = oxidized donor + 2 H (2) O. ,cofactor:Binds 1 calcium ion per heterodimer. ,cofactor:Binds 1 heme B (iron-protoporphyrin IX) group covalently per heterodimer. ,Disease:Defects in MPO are the cause of myeloperoxidase deficiency (MPD) [MIM:254600]. MPD is an autosomal recessive defect that results in disseminated candidiasis. ,Function:Part of the host defense system of polymorphonuclear leukocytes. It is responsible for microbicidal activity against a wide range of organisms. In the stimulated PMN , MPO catalyzes the production of hypohalous acids , primarily hypochlorous acid in physiologic situations , and other toxic intermediates that greatly enhance PMN microbicidal activity. ,online information:MPO mutation db ,online information:Myeloperoxidase entry ,similarity:Belongs to the peroxidase family. XPO subfamily. ,subunit:Tetramer of two light chains and two heavy chains. ,
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