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  Ammonia-oxidizing archaea use the most energy-efficient aerobic pathway for CO2 fixation

Konneke, M., Schubert, D. M., Brown, P. C., Hugler, M., Standfest, S., Schwander, T., et al. (2014). Ammonia-oxidizing archaea use the most energy-efficient aerobic pathway for CO2 fixation. Proc Natl Acad Sci U S A, 111(22), 8239-44. doi:10.1073/pnas.1402028111.

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https://www.ncbi.nlm.nih.gov/pubmed/24843170 (beliebiger Volltext)
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Konneke, M., Autor
Schubert, D. M., Autor
Brown, P. C., Autor
Hugler, M., Autor
Standfest, S., Autor
Schwander, T.1, Autor           
Schada von Borzyskowski, L.1, Autor           
Erb, T. J.1, Autor           
Stahl, D. A., Autor
Berg, I. A., Autor
Affiliations:
1Institute of Microbiology, Eidgenössische Technische Hochschule (ETH) Zurich, Zurich, Switzerland, ou_persistent22              

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Schlagwörter: Acetyl Coenzyme A/metabolism Aerobiosis/*physiology Ammonia/*metabolism Archaea/*enzymology/genetics/metabolism Autotrophic Processes/*physiology Carbon Cycle/*physiology Carbon Dioxide/*metabolism Energy Metabolism/genetics/physiology Evolution, Molecular Hydro-Lyases/genetics/metabolism Oxidation-Reduction Photosynthesis/genetics/physiology Phylogeny Nitrosopumilus maritimus autotrophy
 Zusammenfassung: Archaea of the phylum Thaumarchaeota are among the most abundant prokaryotes on Earth and are widely distributed in marine, terrestrial, and geothermal environments. All studied Thaumarchaeota couple the oxidation of ammonia at extremely low concentrations with carbon fixation. As the predominant nitrifiers in the ocean and in various soils, ammonia-oxidizing archaea contribute significantly to the global nitrogen and carbon cycles. Here we provide biochemical evidence that thaumarchaeal ammonia oxidizers assimilate inorganic carbon via a modified version of the autotrophic hydroxypropionate/hydroxybutyrate cycle of Crenarchaeota that is far more energy efficient than any other aerobic autotrophic pathway. The identified genes of this cycle were found in the genomes of all sequenced representatives of the phylum Thaumarchaeota, indicating the environmental significance of this efficient CO2-fixation pathway. Comparative phylogenetic analysis of proteins of this pathway suggests that the hydroxypropionate/hydroxybutyrate cycle emerged independently in Crenarchaeota and Thaumarchaeota, thus supporting the hypothesis of an early evolutionary separation of both archaeal phyla. We conclude that high efficiency of anabolism exemplified by this autotrophic cycle perfectly suits the lifestyle of ammonia-oxidizing archaea, which thrive at a constantly low energy supply, thus offering a biochemical explanation for their ecological success in nutrient-limited environments.

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 Datum: 2014-05-21
 Publikationsstatus: Erschienen
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 Identifikatoren: Anderer: 24843170
DOI: 10.1073/pnas.1402028111
ISSN: 1091-6490 (Electronic)0027-8424 (Linking)
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Titel: Proc Natl Acad Sci U S A
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 111 (22) Artikelnummer: - Start- / Endseite: 8239 - 44 Identifikator: -