Cited by 52Mitochondrial Function and PathologyATP Synthase and ATPases ResearchRedox biology and oxidative stress

High membrane potential promotes alkenal-induced mitochondrial uncoupling and influences adenine nucleotide translocase conformation

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Azzu, Vian, Parker, Nadeene, Brand, Martin D.·2008·Biochemical Journal

Abstract

Mitochondria generate reactive oxygen species, whose downstream lipid peroxidation products, such as 4-hydroxynonenal, induce uncoupling of oxidative phosphorylation by increasing proton leak through mitochondrial inner membrane proteins such as the uncoupling proteins and adenine nucleotide translocase. Using mitochondria from rat liver, which lack uncoupling proteins, in the present study we show that energization (specifically, high membrane potential) is required for 4-hydroxynonenal to activate proton conductance mediated by adenine nucleotide translocase. Prolonging the time at high membrane potential promotes greater uncoupling. 4-Hydroxynonenal-induced uncoupling via adenine nucleotide translocase is prevented but not readily reversed by addition of carboxyatractylate, suggesting a permanent change (such as adduct formation) that renders the translocase leaky to protons. In contrast with the irreversibility of proton conductance, carboxyatractylate added after 4-hydroxynonenal still inhibits nucleotide translocation, implying that the proton conductance and nucleotide translocation pathways are different. We propose a model to relate adenine nucleotide translocase conformation to proton conductance in the presence or absence of 4-hydroxynonenal and/or carboxyatractylate.

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  1. [33]Brand M. D. Brown G. C. Cooper C. E. Measurement of mitochondrial protonmotive force. Bioenergetics A practical approach 1995 Oxford IRL Press 39 62

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Authors
Azzu, V., Parker, N., & Brand, M. D.
Affiliations
MRC Mitochondrial Biology Unit (GB)
Corresponding author
Azzu, Vian
Venue
Biochemical Journal
Published
2008-06-26
Volume
413
Issue
2
Pages
323-332
ISSN
  • 0264-6021 (ISSN-L)
  • 1470-8728
OpenAlex
W1976727447
Cited by
52
References
54
Citations by year
2025: 2 · 2024: 2 · 2022: 2 · 2021: 3 · 2020: 2 · 2019: 2 · 2018: 3 · 2017: 2 · 2016: 3 · 2015: 3 · 2014: 4 · 2013: 5 · 2012: 6
FWCI
1.64
Type
journal article
Language
en
Open access
Locations
  • Biochemical Journal (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, other-oa)
  • UCL Discovery (University College London) (submittedVersion)
  • Trinity's Access to Research Output (TARA) (Trinity College Dublin) (submittedVersion, other-oa)
Funders
Wellcome Trust (066750, 065326)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › ATP Synthase and ATPases Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
mitochondrial membrane potential, 4-hydroxynonenal, alkenals, mitochondrial uncoupling, adenine nucleotide translocase, proton leak, oxidative phosphorylation, carboxyatractylate, protein conformation, lipid peroxidation, rat liver mitochondria
MeSH terms
Mitochondrial ADP, ATP Translocases, Aldehydes, Animals, Biological Transport, Female, Kinetics, Membrane Potentials, Mitochondria, Mitochondria, Liver, Nucleotides, Oxidative Phosphorylation, Oxygen Consumption, Protein Conformation, Protons, Rats

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