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  Syntrophic linkage between predatory Carpediemonas and specific prokaryotic populations

Hamann, E., Tegetmeyer, H. E., Riedel, D., Littmann, S., Ahmerkamp, S., Chen, J., et al. (2017). Syntrophic linkage between predatory Carpediemonas and specific prokaryotic populations. ISME JOURNAL, 11(5), 1205-1217. doi:10.1038/ismej.2016.197.

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 Creators:
Hamann, Emmo1, Author           
Tegetmeyer, Halina E.2, Author           
Riedel, Dietmar3, 4, Author           
Littmann, Sten5, Author           
Ahmerkamp, Soeren5, Author           
Chen, Jianwei1, Author           
Hach, Philipp F.5, Author           
Strous, Marc1, Author           
Affiliations:
1Microbial Fitness Group, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481708              
2HGF MPG Joint Research Group for Deep Sea Ecology & Technology, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481702              
3Facility for Electron Microscopy, MPI for biophysical chemistry, Max Planck Society, ou_578615              
4Department of Neurobiology, MPI for biophysical chemistry, Max Planck Society, ou_578595              
5Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481693              

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Free keywords: MICROBIAL ECOLOGY; DIVERSITY; SEDIMENTS; GENOMES; BACTERIA; PHYLOGENIES; EVOLUTION; ABUNDANCE; PROTISTS; INSIGHTSEnvironmental Sciences & Ecology; Microbiology;
 Abstract: Most anoxic environments are populated by small (<10 mu m) heterotrophic eukaryotes that prey on different microbial community members. How predatory eukaryotes engage in beneficial interactions with other microbes has rarely been investigated so far. Here, we studied an example of such an interaction by cultivating the anerobic marine flagellate, Carpediemonas frisia sp. nov. (supergroup Excavata), with parts of its naturally associated microbiome. This microbiome consisted of so far uncultivated members of the Deltaproteobacteria, Bacteroidetes, Firmicutes, Verrucomicrobia and Nanoarchaeota. Using genome and transcriptome informed metabolic network modeling, we showed that Carpediemonas stimulated prokaryotic growth through the release of predigested biomolecules such as proteins, sugars, organic acids and hydrogen. Transcriptional gene activities suggested niche separation between biopolymer degrading Bacteroidetes, monomer utilizing Firmicutes and Nanoarchaeota and hydrogen oxidizing Deltaproteobacteria. An efficient metabolite exchange between the different community members appeared to be promoted by the formation of multispecies aggregates. Physiological experiments showed that Carpediemonas could also benefit from an association to these aggregates, as it facilitated the removal of inhibiting metabolites and increased the availability of prey bacteria. Taken together, our results provide a framework to understand how predatory microbial eukaryotes engage, across trophic levels, in beneficial interactions with specific prokaryotic populations.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Issued
 Pages: 13
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000399379500013
DOI: 10.1038/ismej.2016.197
 Degree: -

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Title: ISME JOURNAL
Source Genre: Journal
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Publ. Info: MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND : NATURE PUBLISHING GROUP
Pages: - Volume / Issue: 11 (5) Sequence Number: - Start / End Page: 1205 - 1217 Identifier: ISSN: 1751-7362