AI Article Synopsis
- Microbial oxidation of volatile alkanes in anoxic environments is crucial for Earth’s biogeochemical cycles.
- The discovery of alkyl-CoM reductases (ACR) in archaea suggests they can both oxidize and potentially form alkanes, leading to the hypothesis of alkane generation in nature.
- Research on Candidatus Syntrophoarchaeum shows that the anaerobic oxidation of butane is reversible, indicating that butane, and possible higher volatile alkanes, can be biologically formed, which helps explain their isotopic signatures found in sedimentary basins.
Article Abstract
Microbial formation and oxidation of volatile alkanes in anoxic environments significantly impacts biogeochemical cycles on Earth. The discovery of archaea oxidizing volatile alkanes via deeply branching methyl-coenzyme M reductase variants, dubbed alkyl-CoM reductases (ACR), prompted the hypothesis of archaea-catalysed alkane formation in nature (alkanogenesis). A combination of metabolic modelling, anaerobic physiology assays, and isotope labeling of Candidatus Syntrophoarchaeum archaea catalyzing the anaerobic oxidation of butane (AOB) show a back flux of CO to butane, demonstrating reversibility of the entire AOB pathway. Back fluxes correlate with thermodynamics and kinetics of the archaeal catabolic system. AOB reversibility supports a biological formation of butane, and generally of higher volatile alkanes, helping to explain the presence of isotopically light alkanes and deeply branching ACR genes in sedimentary basins isolated from gas reservoirs.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11543930 | PMC |
| http://dx.doi.org/10.1038/s41467-024-53932-9 | DOI Listing |
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