Was nitric oxide the first deep electron sink?

@article{Ducluzeau2009WasNO,
  title={Was nitric oxide the first deep electron sink?},
  author={A L Ducluzeau and Robert van Lis and Simon Duval and Barbara Schoepp-Cothenet and Michael Russell and Wolfgang Nitschke},
  journal={Trends in biochemical sciences},
  year={2009},
  volume={34 1},
  pages={9-15}
}
Evolutionary histories of enzymes involved in chemiosmotic energy conversion indicate that a strongly oxidizing substrate was available to the last universal common ancestor before the divergence of Bacteria and Archaea. According to palaeogeochemical evidence, O(2) was not present beyond trace amounts on the early Earth. Based on recent phylogenetic, enzymatic and geochemical results, we propose that, in the earliest Archaean, nitric oxide (NO) and its derivatives nitrate and nitrite served as… CONTINUE READING
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