Cited by 212Mitochondrial Function and PathologyCoenzyme Q10 studies and effectsRedox biology and oxidative stress

Evidence for two sites of superoxide production by mitochondrial NADH-ubiquinone oxidoreductase (complex I)

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Treberg, Jason R., Quinlan, Casey L., Brand, Martin D.·2011·Journal of Biological Chemistry

Abstract

Complex I (NADH-ubiquinone oxidoreductase) can form superoxide during forward electron flow (NADH-oxidizing) or, at sufficiently high protonmotive force, during reverse electron transport from the ubiquinone (Q) pool (NAD(+)-reducing). We designed an assay system to allow titration of the redox state of the superoxide-generating site during reverse electron transport in rat skeletal muscle mitochondria: a protonmotive force generated by ATP hydrolysis, succinate:malonate to alter electron supply and modulate the redox state of the Q pool, and inhibition of complex III to prevent QH(2) oxidation via the Q cycle. Stepwise oxidation of the QH(2)/Q pool by increasing malonate concentration slowed the rates of both reverse electron transport and rotenone-sensitive superoxide production by complex I. However, the superoxide production rate was not uniquely related to the resultant potential of the NADH/NAD(+) redox couple. Thus, there is a superoxide producer during reverse electron transport at complex I that responds to Q pool redox state and is not in equilibrium with the NAD reduction state. In contrast, superoxide production during forward electron transport in the presence of rotenone was uniquely related to NAD redox state. These results support a two-site model of complex I superoxide production; one site in equilibrium with the NAD pool, presumably the flavin of the FMN moiety (site I(F)) and the other dependent not only on NAD redox state, but also on protonmotive force and the reduction state of the Q pool, presumably a semiquinone in the Q-binding site (site I(Q)).

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Crossref · 10.1074/jbc.m111.252502

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Authors
Treberg, J. R., Quinlan, C. L., & Brand, M. D.
Affiliations
Buck Institute for Research on Aging (US)
Corresponding author
Treberg, Jason R.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2011-08
Volume
286
Issue
31
Pages
27103-27110
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2077404125
Cited by
212
References
33
Citations by year
2026: 10 · 2025: 13 · 2024: 7 · 2023: 10 · 2022: 9 · 2021: 11 · 2020: 11 · 2019: 13 · 2018: 16 · 2017: 15 · 2016: 15 · 2015: 24 · 2014: 20 · 2013: 19 · 2012: 17
FWCI
7.54
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute on Aging (R01AG033542, PL1AG032118, P01AG025901)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Coenzyme Q10 studies and effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
complex I, superoxide production, reverse electron transfer, proton motive force, rotenone, skeletal muscle mitochondria, two-site model, semiquinone, malonate, ATP hydrolysis
MeSH terms
Animals, Electron Transport, Female, Hydrogen Peroxide, Hydrogen-Ion Concentration, Mitochondria, Superoxides, Rats, Wistar, Electron Transport Complex I, Rats

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