Cited by 265Neutrophil, Myeloperoxidase and Oxidative MechanismsRedox biology and oxidative stressAntioxidant Activity and Oxidative Stress

Eosinophil peroxidase nitrates protein tyrosyl residues

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Wu, Weijia, Chen, Yonghong, Hazen, Stanley L.·1999·Journal of Biological Chemistry

Abstract

Eosinophil peroxidase (EPO) has been implicated in promoting oxidative tissue injury in conditions ranging from asthma and other allergic inflammatory disorders to cancer and parasitic/helminthic infections. Studies thus far on this unique peroxidase have primarily focused on its unusual substrate preference for bromide (Br(-)) and the pseudohalide thiocyanate (SCN(-)) forming potent hypohalous acids as cytotoxic oxidants. However, the ability of EPO to generate reactive nitrogen species has not yet been reported. We now demonstrate that EPO readily uses nitrite (NO(2)(-)), a major end-product of nitric oxide ((.)NO) metabolism, as substrate to generate a reactive intermediate that nitrates protein tyrosyl residues in high yield. EPO-catalyzed nitration of tyrosine occurred more readily than bromination at neutral pH, plasma levels of halides, and pathophysiologically relevant concentrations of NO(2)(-). Furthermore, EPO was significantly more effective than MPO at promoting tyrosine nitration in the presence of plasma levels of halides. Whereas recent studies suggest that MPO can also promote protein nitration through indirect oxidation of NO(2)(-) with HOCl, we found no evidence that EPO can indirectly mediate protein nitration by a similar reaction between HOBr and NO(2)(-). EPO-dependent nitration of tyrosine was modulated over a physiologically relevant range of SCN(-) concentrations and was accompanied by formation of tyrosyl radical addition products (e.g. o,o'-dityrosine, pulcherosine, trityrosine). The potential role of specific antioxidants and nucleophilic scavengers on yields of tyrosine nitration and bromination by EPO are examined. Thus, EPO may contribute to nitrotyrosine formation in inflammatory conditions characterized by recruitment and activation of eosinophils.

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Crossref · 10.1074/jbc.274.36.25933

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  • Generation of nitrogen dioxide and subsequent protein nitration from nitrite oxidation by peroxidases and other heme proteins was appreciated many years before the biologic potential for nitrite reduction to NO was realized.

    “Generation of nitrogen dioxide and subsequent protein nitration from nitrite oxidation by peroxidases such as myeloperoxidase[108], eosinophil peroxidase [109] and also other heme proteins such as cytochrome c [110], hemoglobin [111, 112] and myoglobin [112, 113] was appreciated many years before the biologic potential for nitrite-reduction to NO was realized.”

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Authors
Wu, W., Chen, Y., & Hazen, S. L.
Affiliations
Cleveland State University (US)
Corresponding author
Hazen, Stanley L.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1999-09
Volume
274
Issue
36
Pages
25933-25944
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2094921988
Cited by
265
References
70
Citations by year
2026: 7 · 2025: 2 · 2024: 4 · 2023: 1 · 2022: 1 · 2021: 4 · 2020: 3 · 2019: 4 · 2018: 5 · 2017: 6 · 2016: 4 · 2015: 4 · 2014: 6 · 2013: 7 · 2012: 8
FWCI
7.75
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Heart, Lung, and Blood Institute (HL61878, HL 62526, R01HL061878, R01HL062526)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
Keywords
eosinophil peroxidase, nitrite, tyrosine nitration, reactive nitrogen species, eosinophils, myeloperoxidase, thiocyanate, bromide, hypohalous acids, nitrotyrosine, oxidative tissue injury, antioxidants, eosinophil activation
MeSH terms
Animals, Eosinophils, Inflammation, Kinetics, Nitric Oxide, Nitrites, Peroxidases, Tyrosine, Oxidative Stress, Eosinophil Peroxidase

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