Cited by 637Metalloenzymes and iron-sulfur proteinsMetal-Catalyzed Oxygenation MechanismsEnzyme Structure and Function

The inactivation of Fe-S cluster containing hydro-lyases by superoxide

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Flint, D.H., Tuminello, J.F., Emptage, M.H.·1993·Journal of Biological Chemistry

Abstract

We report in this paper that highly purified Escherichia coli dihydroxy-acid dehydratase, fumarase A, fumarase B, and mammalian aconitase are inactivated by O2- with second order rate constants in the range of 10(6) to 10(7) M-1 s-1. Each of these enzymes belongs to the hydro-lyase class and contains catalytically active [4Fe-4S] clusters. Simultaneous with inactivation by O2- is the release of iron from their clusters. Our working hypothesis is O2- inactivates these enzymes by oxidizing their clusters to an unstable oxidation state, and cluster degradation follows. Consistent with this hypothesis is our observation that spinach dihydroxy-acid dehydratase, a member of the hydro-lyase class that has a catalytically active [2Fe-2S] cluster, is not inactivated and does not lose iron in the presence of O2-. Porcine fumarase, a member of the hydro-lyase class that does not contain an Fe-S cluster, is also not inactivated by O2-. We also report the rate constants for the inactivation of E. coli dihydroxy-acid dehydratase, fumarase A, fumarase B, and mammalian aconitase by O2 are close to 2 x 10(2) M-1 s-1, and the rate constants for the inactivation of E. coli dihydroxy-acid dehydratase and mammalian aconitase by H2O2 are about 10(3) M-1 s-1. E. coli dihydroxy-acid dehydratase has been reported previously to be inactivated in vivo when cells are grown in hyperbaric O2, presumably due to the increased O2- generated under these conditions. We report here that E. coli fumarase A, fumarase B, and aconitase are also inactivated in vivo by hyperbaric O2. Thermodynamic parameters for the oxidation of the cluster of aconitase by O2- and O2 are calculated.

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Crossref · 10.1016/s0021-9258(18)41538-4

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  • Reactions of superoxide with iron/sulphur protein groups have rate constants in excess of 10^6 M−1 s−1 and are highly selective for superoxide.

    “These reactions have rate constants in excess of 106 M−1 s−1 and are highly selective for the superoxide [107].”
  • The best-established detrimental effect of superoxide is inactivation of iron/sulphur protein groups, such as aconitase and bacterial dehydratases required for branched-chain amino acid synthesis.

    “The best-established detrimental effect of superoxide is the inactivation of iron/sulphur protein groups, such as aconitase, and bacterial dehydratases required for branched-chain amino acid synthesis.”

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Authors
Flint, D. H., Tuminello, J. F., & Emptage, M. H.
Affiliations
DuPont (United States) (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1993-10
Volume
268
Issue
30
Pages
22369-22376
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1559173033
Cited by
637
References
43
Citations by year
2026: 9 · 2025: 8 · 2024: 17 · 2023: 11 · 2022: 21 · 2021: 17 · 2020: 12 · 2019: 19 · 2018: 20 · 2017: 26 · 2016: 14 · 2015: 28 · 2014: 29 · 2013: 36 · 2012: 20
FWCI
19.72
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Metalloenzymes and iron-sulfur proteins
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
superoxide, aconitase, [4Fe-4S] cluster, [2Fe-2S] cluster, iron release, hyperbaric oxygen therapy, hydrogen peroxide, enzyme inactivation kinetics, Escherichia coli
MeSH terms
Aconitate Hydratase, Animals, Escherichia coli, Fumarate Hydratase, Hydro-Lyases, Iron, Iron-Sulfur Proteins, Isoenzymes, Kinetics, Mammals, Mathematics, Mitochondria, Models, Theoretical, Superoxides, Vegetables

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