Cited by 387Mitochondrial Function and PathologyCoenzyme Q10 studies and effectsPhotosynthetic Processes and Mechanisms

The mechanism of mitochondrial superoxide production by the cytochrome bc1 complex

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Dröse, Stefan, Brandt, Ulrich·2008·Journal of Biological Chemistry

Abstract

Production of reactive oxygen species (ROS) by the mitochondrial respiratory chain is considered to be one of the major causes of degenerative processes associated with oxidative stress. Mitochondrial ROS has also been shown to be involved in cellular signaling. It is generally assumed that ubisemiquinone formed at the ubiquinol oxidation center of the cytochrome bc(1) complex is one of two sources of electrons for superoxide formation in mitochondria. Here we show that superoxide formation at the ubiquinol oxidation center of the membrane-bound or purified cytochrome bc(1) complex is stimulated by the presence of oxidized ubiquinone indicating that in a reverse reaction the electron is transferred onto oxygen from reduced cytochrome b(L) via ubiquinone rather than during the forward ubiquinone cycle reaction. In fact, from mechanistic studies it seems unlikely that during normal catalysis the ubisemiquinone intermediate reaches significant occupancies at the ubiquinol oxidation site. We conclude that cytochrome bc(1) complex-linked ROS production is primarily promoted by a partially oxidized rather than by a fully reduced ubiquinone pool. The resulting mechanism of ROS production offers a straightforward explanation of how the redox state of the ubiquinone pool could play a central role in mitochondrial redox signaling.

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  1. Kussmaul, L., and Hirst, J. (2006) Proc. Natl. Acad. Sci. U. S. A. 103, 7607-7612
  2. Cape, J. L., Bowman, M. K., and Kramer, D. M. (2007) Proc. Natl. Acad. Sci.

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Authors
Dröse, S., & Brandt, U.
Affiliations
Goethe University Frankfurt (DE)
Corresponding author
Brandt, Ulrich
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2008-08
Volume
283
Issue
31
Pages
21649-21654
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1982085892
Cited by
386
References
35
Citations by year
2026: 7 · 2025: 13 · 2024: 19 · 2023: 10 · 2022: 11 · 2021: 21 · 2020: 22 · 2019: 14 · 2018: 27 · 2017: 22 · 2016: 29 · 2015: 24 · 2014: 24 · 2013: 22 · 2012: 27
FWCI
12.88
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Publication Server of Goethe University Frankfurt am Main (Goethe University Frankfurt) (submittedVersion, cc-by)
Funders
Deutsche Forschungsgemeinschaft ((EXC 115).)
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 › Photosynthetic Processes and Mechanisms
Keywords
cytochrome bc1 complex, mitochondrial superoxide production, reactive oxygen species, ubisemiquinone, electron transfer to oxygen, mitochondrial respiratory chain, oxidative stress, mitochondrial redox signaling
MeSH terms
Animals, Catalysis, Cattle, Dose-Response Relationship, Drug, Electron Transport, Mitochondria, Models, Biological, Molecular Conformation, Oxidation-Reduction, Oxidoreductases, Oxygen, Superoxides, Electron Transport Complex III, Ubiquinone, Reactive Oxygen Species

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