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An exploration of how the thermodynamic efficiency of bioenergetic membrane systems varies with c-subunit stoichiometry of F1F0 ATP synthases
Abstract
Recently the F0 portion of the bovine mitochondrial F1F0-ATP synthase was shown to contain eight 'c' subunits (n = 8). This surprised many in the field, as previously, the only other mitochondrial F0 (for yeast) was shown to have ten 'c' subunits. The metabolic implications of 'c' subunit copy number explored in this paper lead to several surprising conclusions: (1) Aerobically respiring E. coli (n = 10) and animal mitochondria (n = 8) both have very high F1F0 thermodynamic efficiencies of ≈90% under typical conditions, whereas efficiency is only ≈65% for chloroplasts (n = 14). Reasons for this difference, including the importance of transmembrane potential (∆Ψ) as a rotational catalyst, as opposed to an energy source, are discussed. (2) Maximum theoretical P/O ratios in animal mitochondria (n = 8) are calculated to be 2.73 ATP/NADH and 1.64 ATP/FADH2, yielding 34.5 ATP/glucose (assuming NADH import via the malate/aspartate shuttle). The experimentally measured values of 2.44 (±0.15), 1.47 (±0.13), and 31.3 (±1.5), respectively, are only about 10% lower, suggesting very little energy depletion via transmembrane proton leakage. (3) Finally, the thermodynamic efficiency of oxidative phosphorylation is not lower than that of substrate level phosphorylation, as previously believed. The overall thermodynamic efficiencies of oxidative phosphorylation, glycolysis, and the citric acid cycle are ≈80% in all three processes.
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“In addition, it gives rise to inorganic microcompartments and proton gradients of the right polarity and of sufficient magnitude to support chemiosmotic ATP synthesis by the rotor-stator ATP synthase.”
From Serpentinization as the source of energy, electrons, organics, catalysts, nutrients and pH gradients for the origin of LUCA and life (2023) · cites this paper as Silverstein, 2014
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Cited by
Schwander, L., Brabender, M., Mrnjavac, N., Wimmer, J. L. E., Preiner, M., & Martin, W. F. (2023) · Frontiers in Microbiology · doi:10.3389/fmicb.2023.1257597 · Cited by 65
“At the vent-ocean interface, this generated a natural proton gradient of roughly three pH units, a far greater gradient than the roughly one pH unit or less that modern cells require to power their rotor-stator ATP synthetase (Tran and Unden, 1998; Silverstein, 2014).”
Background
Metadata
- Authors
- Silverstein, T. P.
- Affiliations
- Willamette University (US)
- Corresponding author
- Silverstein, Todd P.
- ORCID
- Silverstein, Todd P.
- Venue
- Journal of Bioenergetics and Biomembranes
- Published
- 2014-04-06
- Volume
- 46
- Issue
- 3
- Pages
- 229-241
- ISSN
- 0145-479X (ISSN-L)
- 1573-6881
- OpenAlex
- W2064715954
- Cited by
- 54
- References
- 1
- Citations by year
- 2025: 8 · 2024: 4 · 2023: 7 · 2022: 3 · 2021: 5 · 2020: 3 · 2019: 6 · 2018: 3 · 2017: 1 · 2016: 6 · 2015: 5 · 2014: 1
- FWCI
- 1.78
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Journal of Bioenergetics and Biomembranes (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › ATP Synthase and ATPases Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
- Keywords
- F0F1-ATP synthase, thermodynamic efficiency, proton leak, membrane potential, P/O ratio, oxidative phosphorylation, substrate-level phosphorylation, chloroplast ATP synthase, malate-aspartate shuttle, glycolysis, TCA cycle
- MeSH terms
- Animals, Computer Simulation, Energy Transfer, Humans, Models, Biological, Oxygen, Structure-Activity Relationship, Thermodynamics, Protein Subunits, Mitochondrial Proton-Translocating ATPases, Mitochondrial Membranes
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- Silverstein, T. P. (2014). An exploration of how the thermodynamic efficiency of bioenergetic membrane systems varies with c-subunit stoichiometry of F1F0 ATP synthases. Journal of Bioenergetics and Biomembranes. https://doi.org/10.1007/s10863-014-9547-y
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