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The genome of Rhizobiales bacteria in predatory ants reveals urease gene functions but no genes for nitrogen fixation
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular Evolution. Uppsala University, Science for Life Laboratory, SciLifeLab.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular Evolution. Uppsala University, Science for Life Laboratory, SciLifeLab.ORCID iD: 0000-0002-4940-719X
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular Evolution. Uppsala University, Science for Life Laboratory, SciLifeLab.
School of Life Sciences, Arizona State University, Tempe, AZ, 85287, USA..
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2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, p. 1-11, article id 39197Article in journal (Refereed) Published
Abstract [en]

Gut-associated microbiota of ants include Rhizobiales bacteria with affiliation to the genus Bartonella. These bacteria may enable the ants to fix atmospheric nitrogen, but no genomes have been sequenced yet to test the hypothesis. Sequence reads from a member of the Rhizobiales were identified in the data collected in a genome project of the ant Harpegnathos saltator. We present an analysis of the closed 1.86 Mb genome of the ant-associated bacterium, for which we suggest the species name Candidatus Tokpelaia hoelldoblerii. A phylogenetic analysis reveals a relationship to Bartonella and Brucella, which infect mammals. Novel gene acquisitions include a gene for a putative extracellular protein of more than 6,000 amino acids secreted by the type I secretion system, which may be involved in attachment to the gut epithelium. No genes for nitrogen fixation could be identified, but genes for a multi-subunit urease protein complex are present in the genome. The urease genes are also present in Brucella, which has a fecal-oral transmission pathway, but not in Bartonella, which use blood-borne transmission pathways. We hypothesize that the gain and loss of the urease function is related to transmission strategies and lifestyle changes in the host-associated members of the Rhizobiales.

Place, publisher, year, edition, pages
2016. Vol. 6, p. 1-11, article id 39197
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Evolutionary Biology
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URN: urn:nbn:se:uu:diva-312599DOI: 10.1038/srep39197ISI: 000392093200001PubMedID: 27976703OAI: oai:DiVA.org:uu-312599DiVA, id: diva2:1064231
Funder
Swedish Research Council, 349-2007-8732 621-2014-4460Knut and Alice Wallenberg Foundation, 2011.0148 2012.0075Available from: 2017-01-12 Created: 2017-01-12 Last updated: 2017-11-29Bibliographically approved

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Neuvonen, Minna M.Tamarit, DanielNäslund, KristinaGuy, LionelAndersson, Siv G. E.
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Molecular EvolutionScience for Life Laboratory, SciLifeLabDepartment of Medical Biochemistry and Microbiology
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