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A hydrophobic ammonia-oxidizing archaeon of the Nitrosocosmicus clade isolated from coal tar-contaminated sediment
Jung, M.Y.; Kim, J.G.; Sinninghe Damsté, J.S.; Rijpstra, W.I.C.; Madsen, E.L.; Kim, S.J.; Hong, H.; Si, O.-J.; Kerou, M.; Schleper, C.; Rhee, S.K. (2016). A hydrophobic ammonia-oxidizing archaeon of the Nitrosocosmicus clade isolated from coal tar-contaminated sediment. Environmental Microbiology Reports 8(6): 983–992. dx.doi.org/10.1111/1758-2229.12477
In: Environmental Microbiology Reports. Wiley-Blackwell. ISSN 1758-2229, meer
Peer reviewed article  

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  • Jung, M.Y.
  • Kim, J.G.
  • Sinninghe Damsté, J.S., meer
  • Rijpstra, W.I.C., meer
  • Madsen, E.L.
  • Kim, S.J.
  • Hong, H.
  • Si, O.-J.
  • Kerou, M.
  • Schleper, C.
  • Rhee, S.K.

Abstract
    A wide diversity of ammonia-oxidizing archaea (AOA)within the phylum Thaumarchaeota exists and playsa key role in the N cycle in a variety of habitats. In thisstudy, we isolated and characterized an ammoniaoxidizingarchaeon, strain MY3, from a coal tarcontaminatedsediment. Phylogenetically, strain MY3falls in clade ‘Nitrosocosmicus’ of the thaumarchaeotalgroup I.1b. The cells of strain MY3 are large‘walnut-like’ cocci, divide by binary fission along acentral cingulum, and form aggregates. Strain MY3 ismesophilic and neutrophilic. An assay of 13C-bicarbonateincorporation into archaeal membrane lipidsindicated that strain MY3 is capable of autotrophy. Incontrast to some other AOA, TCA cycle intermediates,i.e. pruvate, oxaloacetate and a-ketoglutarate,did not affect the growth rates and yields of strainMY3. The attachment of cells of strain MY3 to XAD-7hydrophobic beads and to the adsorbent vermiculitedemonstrated the potential of strain MY3 to form biofilms.The cell surface was confirmed to be hydrophobicby the extraction of strain MY3 from an aqueousmedium with p-xylene. Our finding of a strong potentialfor surface attachment by strain MY3 may reflectan adaptation to the selective pressures in hydrophobicterrestrial environments.

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