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Description

Myeloperoxidase (EC 1.11.2.2, UniProt P05164) is encoded by the MPO gene (Gene ID 4353) in human. Myeloperoxidase/MPO is a heme protein synthesized during myeloid differentiation that constitutes the major component of neutrophil azurophilic granules. Produced as a 745 a.a. single chain precursor with a signal peptide sequence (a.a. 1-48), myeloperoxidase is subsequently cleaved into a light chain (a.a.165-278) and a heavy chain (a.a. 279-745). The mature myeloperoxidase is a tetramer composed of 2 light chains and 2 heavy chains. MPO catalyzes hydrogen peroxide-dependent oxidations and the formation of hypochlorous acid that is central to the microbicidal activity of netrophils.