title: Reactions of heme peroxidases with peroxynitrite.
abstract: The interaction of peroxynitrite, produced by ozonation of azide, with two heme peroxidases (horseradish peroxidase and lactoperoxidase) was studied. Enzymes retained full activity after incubation with peroxynitrite at neutral pH. Lactoperoxidase alone was found to catalyze peroxynitrite decomposition, whereas horseradish peroxidase accelerated peroxynitrite decomposition only in the presence of certain substrates. For example, in the presence of guaiacol the catalyzing effect was clear, but in the presence of trolox was only noticeable.
authors.affiliation: Institute of Applied Radiation Chemistry, Technical University of Lódź, Poland. lgebicka@mitr.p.lodz.pl
authors.forename: L
authors.initials: L
authors.lastname: Gebicka
authors.forename: J L
authors.initials: JL
authors.lastname: Gebicki
mesh_terms: D000818:Animals; D006139:Guaiacol / Q000378:metabolism; D006735:Horseradish Peroxidase / Q000378:metabolism*; D007700:Kinetics; D007784:Lactoperoxidase / Q000378:metabolism*; D009566:Nitrates / Q000378:metabolism*; D010088:Oxidoreductases / Q000378:metabolism; D010944:Plants / Q000201:enzymology; D013379:Substrate Specificity; D013997:Time Factors
chemical_list: D009566:Nitrates; C039642:peroxynitric acid; D006139:Guaiacol; D010088:Oxidoreductases; D006735:Horseradish Peroxidase; D007784:Lactoperoxidase; C109110:peroxynitrite reductase