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Carbon isotope evidence for the global physiology of Proterozoic cyanobacteria
Hurley, S.J.; Wing, B.A.; Jasper, C.E.; Hill, N.C.; Cameron, J.C. (2021). Carbon isotope evidence for the global physiology of Proterozoic cyanobacteria. Science Advances 7(2): eabc8998. https://dx.doi.org/10.1126/sciadv.abc8998
In: Science Advances. AAAS: New York. ISSN 2375-2548, more
Peer reviewed article  

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  • Hurley, S.J.
  • Wing, B.A.
  • Jasper, C.E.
  • Hill, N.C.
  • Cameron, J.C.

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.

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