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Oxygen and nitrogen production by an ammonia-oxidizing archaeon
Kraft, B.; Jehmlich, N.; Larsen, M.; Bristow, L.A.; Könneke, M.; Thamdrup, B.; Canfield, D.E. (2022). Oxygen and nitrogen production by an ammonia-oxidizing archaeon. Science (Wash.) 375(6576): 97-100. https://dx.doi.org/10.1126/science.abe6733
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, more
Related to:
Martens-Habbena, W.; Qin, W. (2022). Archaeal nitrification without oxygen. Science (Wash.) 375(6576): 27-28. https://dx.doi.org/10.1126/science.abn0373, more
Peer reviewed article  

Available in  Authors 

Authors  Top 
  • Kraft, B.
  • Jehmlich, N.
  • Larsen, M.
  • Bristow, L.A.
  • Könneke, M.
  • Thamdrup, B.
  • Canfield, D.E.

Abstract
    Ammonia-oxidizing archaea (AOA) are one of the most abundant groups of microbes in the world’s oceans and are key players in the nitrogen cycle. Their energy metabolism—the oxidation of ammonia to nitrite—requires oxygen. Nevertheless, AOA are abundant in environments where oxygen is undetectable. By carrying out incubations for which oxygen concentrations were resolved to the nanomolar range, we show that after oxygen depletion, Nitrosopumilus maritimus produces dinitrogen and oxygen, which is used for ammonia oxidation. The pathway is not completely resolved but likely has nitric oxide and nitrous oxide as key intermediates. N. maritimus joins a handful of organisms known to produce oxygen in the dark. On the basis of this ability, we reevaluate the role of N. maritimus in oxygen-depleted marine environments.

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