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The novel bacterial phylum Calditrichaeota is diverse, widespread and abundant in marine sediments and has the capacity to degrade detrital proteins
Aarhus Univ, Microbiol Sect, Dept Biosci, Geomicrobiol, Aarhus, Denmark.;Aarhus Univ Hosp, Dept Mol Med, Aarhus, Denmark..
Aarhus Univ, Microbiol Sect, Dept Biosci, Geomicrobiol, Aarhus, Denmark..
Aarhus Univ, Microbiol Sect, Dept Biosci, Geomicrobiol, Aarhus, Denmark..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular Evolution. Uppsala University, Science for Life Laboratory, SciLifeLab.
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2017 (English)In: Environmental Microbiology Reports, ISSN 1758-2229, E-ISSN 1758-2229, Vol. 9, no 4, 397-403 p.Article in journal (Refereed) Published
Abstract [en]

Calditrichaeota is a recently recognized bacterial phylum with three cultured representatives, isolated from hydrothermal vents. Here we expand the phylogeny and ecology of this novel phylum with metagenome-derived and single-cell genomes from six uncultivated bacteria previously not recognized as members of Calditrichaeota. Using 16S rRNA gene sequences from these genomes, we then identified 322 16S rRNA gene sequences from cultivation-independent studies that can now be classified as Calditrichaeota for the first time. This dataset was used to re-analyse a collection of 16S rRNA gene amplicon datasets from marine sediments showing that the Calditrichaeota are globally distributed in the seabed at high abundance, making up to 6.7% of the total bacterial community. This wide distribution and high abundance of Calditrichaeota in cold marine sediment has gone unrecognized until now. All Calditrichaeota genomes show indications of a chemoorganoheterotrophic metabolism with the potential to degrade detrital proteins through the use of extracellular peptidases. Most of the genomes contain genes encoding proteins that confer O-2 tolerance, consistent with the relatively high abundance of Calditrichaeota in surficial bioturbated part of the seabed and, together with the genes encoding extracellular peptidases, suggestive of a general ecophysiological niche for this newly recognized phylum in marine sediment.

Place, publisher, year, edition, pages
2017. Vol. 9, no 4, 397-403 p.
National Category
Microbiology
Identifiers
URN: urn:nbn:se:uu:diva-332943DOI: 10.1111/1758-2229.12544ISI: 000405931900007PubMedID: 28488795OAI: oai:DiVA.org:uu-332943DiVA: diva2:1154548
Funder
Swedish Research Council, 621-2009-4813Knut and Alice Wallenberg FoundationDanish National Research FoundationSwedish Foundation for Strategic Research , SSF-FFL5EU, FP7, Seventh Framework Programme, MICROENERGY 294200EU, FP7, Seventh Framework Programme, PUZZLE_ CELL 310039
Available from: 2017-11-02 Created: 2017-11-02 Last updated: 2017-11-02Bibliographically approved

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Fernández Cáceres, EvaEttema, Thijs J. G.
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