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- W2766308105 abstract "Dissimilatory sulfate reduction (DSR) has been a key process influencing the global carbon cycle, atmospheric composition and climate for much of Earth's history, yet the energy metabolism of sulfate-reducing microbes remains poorly understood. Many organisms, particularly sulfate reducers, live in low-energy environments and metabolize at very low rates, requiring specific physiological adaptations. We identify one such potential adaptation-the electron carriers selected for survival under energy-limited conditions. Employing a quantitative biochemical-isotopic model, we find that the large S isotope fractionations (>55‰) observed in a wide range of natural environments and culture experiments at low respiration rates are only possible when the standard-state Gibbs free energy (ΔG'°) of all steps during DSR is more positive than -10 kJ mol-1. This implies that at low respiration rates, only electron carriers with modestly negative reduction potentials are involved, such as menaquinone, rubredoxin, rubrerythrin or some flavodoxins. Furthermore, the constraints from S isotope fractionation imply that ferredoxins with a strongly negative reduction potential cannot be the direct electron donor to S intermediates at low respiration rates. Although most sulfate reducers have the genetic potential to express a variety of electron carriers, our results suggest that a key physiological adaptation of sulfate reducers to low-energy environments is to use electron carriers with modestly negative reduction potentials.The ISME Journal advance online publication, 31 October 2017; doi:10.1038/ismej.2017.185." @default.
- W2766308105 created "2017-11-10" @default.
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- W2766308105 date "2017-10-31" @default.
- W2766308105 modified "2023-10-14" @default.
- W2766308105 title "Electron carriers in microbial sulfate reduction inferred from experimental and environmental sulfur isotope fractionations" @default.
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- W2766308105 doi "https://doi.org/10.1038/ismej.2017.185" @default.
- W2766308105 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5776465" @default.
- W2766308105 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29087380" @default.
- W2766308105 hasPublicationYear "2017" @default.
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