Cited by 165Neutrophil, Myeloperoxidase and Oxidative MechanismsRedox biology and oxidative stressFree Radicals and Antioxidants

Reevaluation of the rate constants for the reaction of hypochlorous acid (HOCl) with cysteine, methionine, and peptide derivatives using a new competition kinetic approach

Storkey, Corin, Davies, Michael J., Pattison, David I.·2014·Free Radical Biology and Medicine

Abstract

Activated white cells use oxidants generated by the heme enzyme myeloperoxidase to kill invading pathogens. This enzyme utilizes H2O2 and Cl(-), Br(-), or SCN(-) to generate the oxidants HOCl, HOBr, and HOSCN, respectively. Whereas controlled production of these species is vital in maintaining good health, their uncontrolled or inappropriate formation (as occurs at sites of inflammation) can cause host tissue damage that has been associated with multiple inflammatory pathologies including cardiovascular diseases and cancer. Previous studies have reported that sulfur-containing species are major targets for HOCl but as the reactions are fast the only physiologically relevant kinetic data available have been extrapolated from data measured at high pH (>10). In this study these values have been determined at pH 7.4 using a newly developed competition kinetic approach that employs a fluorescently tagged methionine derivative as the competitive substrate (k(HOCl + Fmoc-Met), 1.5 × 10(8)M(-1)s(-1)). This assay was validated using the known k(HOCl + NADH) value and has allowed revised k values for the reactions of HOCl with Cys, N-acetylcysteine, and glutathione to be determined as 3.6 × 10(8), 2.9 × 10(7), and 1.24 × 10(8)M(-1)s(-1), respectively. Similar experiments with methionine derivatives yielded k values of 3.4 × 10(7)M(-1)s(-1) for Met and 1.7 × 10(8)M(-1)s(-1) for N-acetylmethionine. The k values determined here for the reaction of HOCl with thiols are up to 10-fold higher than those previously determined and further emphasize the critical importance of reactions of HOCl with thiol targets in biological systems.

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Crossref · 10.1016/j.freeradbiomed.2014.04.024

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  • HOCl reacts rapidly with several biological molecules, particularly thiols, thioethers, heme proteins, and amino groups, and can cause tissue injury.

    “HOCl reacts rapidly with several biological molecules, particularly those with thiols, thioethers, heme proteins, and amino groups, and can cause tissue injury [152].”

    From The Role of Reactive Species on Innate Immunity (2022) · cites this paper as [152]

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Authors
Storkey, C., Davies, M. J., & Pattison, D. I.
Affiliations
The University of Sydney (AU)
Corresponding author
Pattison, David I.
Venue
Free Radical Biology and Medicine
Publisher
Elsevier BV
Published
2014-08
Volume
73
Pages
60-66
ISSN
0891-5849 (ISSN-L)
OpenAlex
W2000363473
Cited by
165
References
47
Citations by year
2026: 9 · 2025: 14 · 2024: 13 · 2023: 12 · 2022: 12 · 2021: 12 · 2020: 21 · 2019: 22 · 2018: 10 · 2017: 13 · 2016: 13 · 2015: 13 · 2014: 1
FWCI
6.05
Type
journal article
Language
en
Open access
closed
Locations
  • Free Radical Biology and Medicine (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Australian Research Council through the Centres of Excellence (CE0561607)
  • Discovery Programs (DP0988311)
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
  • Physical Sciences › Chemistry › Organic Chemistry › Free Radicals and Antioxidants
Keywords
hypochlorous acid, rate constants, cysteine, methionine, thiols, glutathione, N-acetylcysteine, N-acetylmethionine, myeloperoxidase, pH 7.4, oxidative stress, inflammation, host tissue damage
MeSH terms
Cysteine, Hydrogen Peroxide, Hypochlorous Acid, Methionine, Peroxidase, Oxidation-Reduction, Peptides, Oxidants, Computational Biology

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