Physiological Levels of Mammalian Uncoupling Protein 2 Do Not Uncouple Yeast Mitochondria
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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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Strong evidence of mitochondrial uncoupling property is clear for UCP-1 but still heavily debated for other UCPs.
“Importantly, although strong evidence of the mitochondrial uncoupling property is clear for UCP-1 [7,12], it is still heavily debated for the other UCPs [13,14,15].”
From Mitochondrial Uncoupling: A Key Controller of Biological Processes in Physiology and Diseases (2019) · cites this paper as [15]
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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
- hybrid
- doi.org
- Licence
- 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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