Superoxide Reaction with Tyrosyl Radicals Generates para-Hydroperoxy and para-Hydroxy Derivatives of Tyrosine
Abstract
Tyrosine-derived hydroperoxides are formed in peptides and proteins exposed to enzymatic or cellular sources of superoxide and oxidizing species as a result of the nearly diffusion-limited reaction between tyrosyl radical and superoxide. However, the structure of these products, which informs their reactivity in biology, has not been unequivocally established. We report here the complete characterization of the products formed in the addition of superoxide, generated from xanthine oxidase, to several peptide-derived tyrosyl radicals, formed from horseradish peroxidase. RP-HPLC, LC-MS, and NMR experiments indicate that the primary stable products of superoxide addition to tyrosyl radical are para-hydroperoxide derivatives (para relative to the position of the OH in tyrosine) that can be reduced to the corresponding para-alcohol. In the case of glycyl-tyrosine, a stable 3-(1-hydroperoxy-4-oxocyclohexa-2,5-dien-1-yl)-L-alanine was formed. In tyrosyl-glycine and Leu-enkephalin, which have N-terminal tyrosines, bicyclic indolic para-hydroperoxide derivatives were formed ((2S,3aR,7aR)-3a-hydroperoxy-6-oxo-2,3,3a,6,7,7a-hexahydro-1H-indole-2-carboxylic acid) by the conjugate addition of the free amine to the cyclohexadienone. It was also found that significant amounts of the para-OH derivative were generated from the hydroxyl radical, formed on exposure of tyrosine-containing peptides to Fenton conditions. The para-OOH and para-OH derivatives are much more reactive than other tyrosine oxidation products and may play important roles in physiology and disease.
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The tyrosine hydroperoxide can be formed in the ortho or para position relative to the phenoxyl radical due to resonant forms of Tyr.
“The hydroperoxide, due to the resonant forms of Tyr, can be formed in the ortho or para position with respect to the phenoxyl radical [138,139,140], Figure 51 and Figure 52.”
From Superoxide Anion Chemistry—Its Role at the Core of the Innate Immunity (2023) · cites this paper as [140]
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- Authors
- Möller, M. N., Hatch, D. M., Kim, H.-Y. H., & Porter, N. A.
- Affiliations
- Universidad de la República de Uruguay (UY)
- Vanderbilt University (US)
- Corresponding author
- Porter, Ned A.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-09-28
- Volume
- 134
- Issue
- 40
- Pages
- 16773-16780
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2315794577
- Cited by
- 50
- References
- 44
- Citations by year
- 2026: 1 · 2025: 3 · 2024: 5 · 2023: 6 · 2022: 4 · 2021: 4 · 2020: 2 · 2019: 6 · 2018: 5 · 2017: 1 · 2016: 3 · 2015: 1 · 2014: 5 · 2013: 4
- FWCI
- 1.28
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of the American Chemical Society (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Foundation
- Vanderbilt University
- National Institute of Environmental Health Sciences (P01ES013125)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
- Physical Sciences › Chemistry › Organic Chemistry › Free Radicals and Antioxidants
- Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
- Keywords
- superoxide, tyrosyl radical, xanthine oxidase, horseradish peroxidase, peptide oxidation, leu-enkephalin, hydroxyl radicals, Fenton reaction, protein oxidation, cyclohexadienones
- MeSH terms
- Animals, Cattle, Enkephalin, Leucine, Horseradish Peroxidase, Hydrogen Peroxide, Models, Molecular, Oxidation-Reduction, Peptides, Superoxides, Superoxide Dismutase, Tyrosine, Xanthine Oxidase, Armoracia
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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