Draft Genome Sequence of an Ammonia-Oxidizing Archaeon, “Candidatus Nitrosopumilus sediminis” AR2, from Svalbard in the Arctic Circle
Soo-Je Park,Jong-Geol Kim,Man-Young Jung,So-Jeong Kim,In-Tae Cha,Rohit Ghai,Ana-Belen Martin-Cuadrado,Francisco Rodriguez-Valera,Sung-Keun Rhee +8 more
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TL;DR: Interestingly, the AR2 genome sequence was revealed to possess, uniquely among cultivated AOA from marine environments, a capability for urea utilization.
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Abstract: Ammonia-oxidizing archaea (AOA) typically predominate over ammonia-oxidizing bacteria in marine sediments. We herein present the draft genome sequence of an ammonia-oxidizing archaeon, "Candidatus Nitrosopumilus sediminis" AR2, which was enriched in culture from a marine sediment obtained off Svalbard, within the Arctic Circle. The typical genes involved in archaeal ammonia oxidation and carbon fixation necessary for chemolithoautotrophic growth were observed. Interestingly, the AR2 genome sequence was revealed to possess, uniquely among cultivated AOA from marine environments, a capability for urea utilization.
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Single-cell genomics shedding light on marine Thaumarchaeota diversification
Haiwei Luo,Bradley B. Tolar,Brandon K. Swan,Chuanlun Zhang,Chuanlun Zhang,Ramunas Stepanauskas,Mary Ann Moran,James T. Hollibaugh +7 more
TL;DR: The analysis of partial genomes has confirmed the depth differentiation of Thaumarchaeota populations observed previously, consistent with the distribution of putative mechanisms to reduce light-induced damage in shallow- and deep-water populations.
Candidatus Nitrosocaldus cavascurensis, an Ammonia Oxidizing, Extremely Thermophilic Archaeon with a Highly Mobile Genome.
Sophie S. Abby,Michael Melcher,Melina Kerou,Mart Krupovic,Michaela Stieglmeier,Claudia Rossel,Kevin Pfeifer,Christa Schleper +7 more
TL;DR: The first enrichment of a thermophilic representative with a sequenced genome is presented, which facilitates the search for adaptive strategies and for traits that shape the evolution of Thaumarchaeota.
Lists of names of prokaryotic Candidatus taxa.
TL;DR: The authors present annotated lists of names of Candidatus taxa of prokaryotes with ranks between subspecies and class, proposed between the mid-1990s, when the provisional status of Candidate taxa was first established, and the end of 2018, where necessary, corrected names are proposed that comply with the current provisions of the International Code of Nomenclature of Prokaryote and its Orthography appendix.
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Temperature responses of soil ammonia-oxidising archaea depend on pH
TL;DR: The results indicate that pH-driven diversification may have consequences for other aspects of AOA physiology including temperature optima for growth and activity in the environment.
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The deep-sea glass sponge Lophophysema eversa harbours potential symbionts responsible for the nutrient conversions of carbon, nitrogen and sulfur.
TL;DR: Genomic analysis on the AOA, NOB and SOB in the sponge revealed specific functional features of sponge-associated microorganisms in comparison with the closely related free-living relatives, including chemotaxis, phage defence, vitamin biosynthesis and nutrient uptake among others, which are related to ecological functions.
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