Unraveling the critical growth factors for stable cultivation of (nano-sized) Micrarchaeota
Krause, S.; Sabrina, G.; Reuse, C.; Dombrowski, N.; Villanueva, L.; Bunk, B.; Spöer, C.; Neu, T. R.; Kuhlicke, U.; Schmidt-Hohagen, K.; Hiller, K.; Rachel, R.; Spang, A.; Gescher, J.
Show abstract
Micrarchaeota are members of the archaeal DPANN superphylum. These so far poorly characterized archaea have been found to have reduced genomes and likely depend on interactions with host organisms for growth and survival. Here we report on the enrichment of the first stable co-culture of a member of the Micrarchaeota together with its host, as well as the isolation of the latter. Electron microscopic analysis suggest that growth is dependent on the physical interaction of the two organisms within a biofilm. The interaction seems to be ensured by the necessity to grow in form of a biofilm. Furthermore, transcriptomic analyses indicate a shift towards biofilm formation of the host as a result of co-cultivation. Finally, genomic, metabolomic, extracellular polymeric substance (EPSs) and lipid content analyses reveal that the Micrarchaeon symbiont relies on the acquisition of metabolites from its host and thereby provide first insights into the basis of symbiont-host interactions.
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