Cited by 99Mitochondrial Function and PathologyATP Synthase and ATPases ResearchMetabolism, Diabetes, and Cancer

Physiological Levels of Mammalian Uncoupling Protein 2 Do Not Uncouple Yeast Mitochondria

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Stuart, Jeff A., Harper, James A., Brindle, Kevin M., Jekabsons, Mika B., Brand, Martin D.·2001·Journal of Biological Chemistry

Abstract

We assessed the ability of human uncoupling protein 2 (UCP2) to uncouple mitochondrial oxidative phosphorylation when expressed in yeast at physiological and supraphysiological levels. We used three different inducible UCP2 expression constructs to achieve mitochondrial UCP2 expression levels in yeast of 33, 283, and 4100 ng of UCP2/mg of mitochondrial protein. Yeast mitochondria expressing UCP2 at 33 or 283 ng/mg showed no increase in proton conductance, even in the presence of various putative effectors, including palmitate and all-trans-retinoic acid. Only when UCP2 expression in yeast mitochondria was increased to 4 microg/mg, more than an order of magnitude greater than the highest known physiological concentration, was proton conductance increased. This increased proton conductance was not abolished by GDP. At this high level of UCP2 expression, an inhibition of substrate oxidation was observed, which cannot be readily explained by an uncoupling activity of UCP2. Quantitatively, even the uncoupling seen at 4 microgram/mg was insufficient to account for the basal proton conductance of mammalian mitochondria. These observations suggest that uncoupling of yeast mitochondria by UCP2 is an overexpression artifact leading to compromised mitochondrial integrity.

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Crossref · 10.1074/jbc.m011566200

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Authors
Stuart, J. A., Harper, J. A., Brindle, K. M., Jekabsons, M. B., & Brand, M. D.
Affiliations
  • University of Cambridge (GB)
  • MRC Mitochondrial Biology Unit (GB)
Corresponding author
Brand, Martin D.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2001-05
Volume
276
Issue
21
Pages
18633-18639
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2034223813
Cited by
99
References
41
Citations by year
2025: 1 · 2024: 2 · 2023: 1 · 2022: 2 · 2021: 1 · 2020: 3 · 2019: 1 · 2017: 2 · 2016: 1 · 2015: 2 · 2014: 2 · 2013: 1
FWCI
4.31
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
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 › Metabolism, Diabetes, and Cancer
Keywords
UCP2, mitochondrial uncoupling, oxidative phosphorylation, proton conductance, yeast mitochondria, mitochondrial integrity, palmitate, all-trans retinoic acid, gross domestic product
MeSH terms
Uncoupling Protein 2, Gene Expression Regulation, Humans, Ion Channels, Mitochondria, Proteins, Saccharomyces cerevisiae, Mitochondrial Proteins, Membrane Transport Proteins

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