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In enzymology, a phospholipid-hydroperoxide glutathione peroxidase is an enzyme that catalyzes the chemical reaction
Thus, the two substrates of this enzyme are glutathione and lipid hydroperoxide, whereas its 3 products are glutathione disulfide, lipid, and H2O.
This enzyme belongs to the family of oxidoreductases, to be specific those acting on a peroxide as acceptor. The systematic name of this enzyme class is glutathione:lipid-hydroperoxide oxidoreductase. Other names in common use include peroxidation-inhibiting protein, PHGPX, peroxidation-inhibiting protein: peroxidase, glutathione, , phospholipid hydroperoxide glutathione peroxidase, hydroperoxide glutathione peroxidase, or glutathione peroxidase 4. This enzyme participates in glutathione metabolism.