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- W3096110815 abstract "Ancestral cyanobacteria are assumed to be prominent primary producers after the Great Oxidation Event [≈2.4 to 2.0 billion years (Ga) ago], but carbon isotope fractionation by extant marine cyanobacteria (α-cyanobacteria) is inconsistent with isotopic records of carbon fixation by primary producers in the mid-Proterozoic eon (1.8 to 1.0 Ga ago). To resolve this disagreement, we quantified carbon isotope fractionation by a wild-type planktic β-cyanobacterium (Synechococcus sp. PCC 7002), an engineered Proterozoic analog lacking a CO2-concentrating mechanism, and cyanobacterial mats. At mid-Proterozoic pH and pCO2 values, carbon isotope fractionation by the wild-type β-cyanobacterium is fully consistent with the Proterozoic carbon isotope record, suggesting that cyanobacteria with CO2-concentrating mechanisms were apparently the major primary producers in the pelagic Proterozoic ocean, despite atmospheric CO2 levels up to 100 times modern. The selectively permeable microcompartments central to cyanobacterial CO2-concentrating mechanisms (carboxysomes) likely emerged to shield rubisco from O2 during the Great Oxidation Event." @default.
- W3096110815 created "2020-11-09" @default.
- W3096110815 creator A5019638737 @default.
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- W3096110815 date "2021-01-06" @default.
- W3096110815 modified "2023-09-25" @default.
- W3096110815 title "Carbon isotope evidence for the global physiology of Proterozoic cyanobacteria" @default.
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- W3096110815 doi "https://doi.org/10.1126/sciadv.abc8998" @default.
- W3096110815 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7787495" @default.
- W3096110815 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33523966" @default.
- W3096110815 hasPublicationYear "2021" @default.
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