Kirsten Küsel

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SEEK ID: https://data.chembiosys.de/people/22

Location: Germany

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Metallophores as Mediators for Metal Cycling: Profiling and Ecological Evaluation of Ligands Involved in the Microbial Cycling of Iron in Complex Systems

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Organisms: Shewanella oneidensis, Pseudomonas sp., Sideroxydans sp.

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Friedrich Schiller University Jena (FSU), Institute of Ecology

Country: Germany

City: Jena

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Sticking together: Inter-species aggregation of bacteria isolated from iron snow iscontrolled by chemical signaling

ChemBioSys I

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We investigated the role of chemical signaling between two co-occurring bacteria that each make up more than 10% of the community in iron-rich lakes aggregates (iron snow) by comparative metagenomics and propose a model that shows rapid iron snow formation and ultimately energy transfer from the photic zone to deeper water layers are controlled via a chemically mediated interplay.

Submitter: Maria Sorokina

Studies: Sticking together: Inter-species aggregation of bacteria isolated from i...

Assays: GC-MS: Sticking together: Inter-species aggregation of bacteria isolated..., LC-MS: Sticking together: Inter-species aggregation of bacteria isolated...

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Created: 27th Nov 2018 at 12:48

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Rhizobactin B is the preferred siderophore by a novel Pseudomonas isolate to obtain iron from dissolved organic matter in peatlands.

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Bacteria often release diverse iron-chelating compounds called siderophores to scavenge iron from the environment for many essential biological processes. In peatlands, where the biogeochemical cycle …

Authors: S. Kugler, R. E. Cooper, J. Boessneck, K. Kusel, T. Wichard

Date Published: 7th Oct 2020

Publication Type: Journal

PubMed ID: 33026607

Citation: Biometals. 2020 Oct 7. pii: 10.1007/s10534-020-00258-w. doi: 10.1007/s10534-020-00258-w.

Created: 18th Nov 2020 at 16:46

Ferrihydrite associated organic matter (OM) stimulates reduction by <i>Shewanella oneidensis</i> MR-1 and a complex microbial consortia

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The formation of Fe(III) oxides in natural environments occurs in the presence of natural organic matter (OM), resulting in the formation of OM-mineral complexes that form through adsorption or … coprecipitation processes. Thus, microbial Fe(III) reduction in natural environments most often occurs in the presence of OM-mineral complexes rather than pure Fe(III) minerals. In this study we investigated to which extent the content of adsorbed or coprecipitated OM on ferrihydrite influences the rate of Fe(III) reduction by Shewanella oneidensis MR-1, a model Fe(III)-reducing microorganism, in comparison to a microbial consortium extracted from the acidic, Fe-rich Schlöppnerbrunnen fen. We found that increased OM contents led to increased rates of microbial Fe(III) reduction by S. oneidensis MR-1 in contrast to earlier findings with the model organism Geobacter bremensis. Ferrihydrite-OM coprecipitates were reduced slightly faster than ferrihydrites with adsorbed OM. Surprisingly, the complex microbial consortia stimulated by a mixture of electrons donors (lactate, acetate, and glucose) mimics S. oneidensis under the same experimental Fe(III)-reducing conditions suggesting similar mechanisms of electron transfer whether or not the OM is adsorbed or coprecipitated to the mineral surfaces. We also followed potential shifts of the microbial community during the incubation via 16S rRNA gene sequence analyses to determine variations due to the presence of adsorbed or coprecipitated OM-ferrihydrite complexes in contrast to pure ferrihydrite. Community profile analyses showed no enrichment of typical model Fe(III)-reducing bacteria, such as Shewanella sp. or Geobacter sp., but an enrichment of fermenters (i.e. Enterobacteria) during pure ferrihydrite incubations which are known to use Fe(III) as an electron sink. Instead, OM-mineral complexes favored the enrichment of microbes including Desulfobacteria and Pelosinus sp., both of which can utilize lactate and acetate as an electron donor under Fe(III) reducing conditions. In summary, this study shows that increasing concentrations of OM in OM-mineral complexes determines microbial Fe(III) reduction rates and shapes the microbial community structure involved in the reductive dissolution of ferrihydrite. Similarities observed between the complex Fe(III)-reducing microbial consortia and the model Fe(III)-reducer S. oneidensis MR-1 suggest electron shuttling mechanisms dominate in OM-rich environments, including soils, sediments, and fens, where natural OM interacts with Fe(III) oxides during mineral formation.

Authors: Rebecca E. Cooper, Karin Eusterhues, Carl-Eric Wegner, Kai Uwe Totsche, Kirsten Küsel

Date Published: 6th Jul 2017

Publication Type: Not specified

DOI: 10.5194/bg-2017-270

Citation:

Created: 13th Oct 2017 at 09:27

Sticking together: inter-species aggregation of bacteria isolated from iron snow is controlled by chemical signaling

Total ChemBioSys, C1, C4, Z01

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Marine and lake snow is a continuous shower of mixed organic and inorganic aggregates falling from the upper water where primary production is substantial. These pelagic aggregates provide a niche for …

Authors: J. F. Mori, N. Ueberschaar, S. Lu, R. E. Cooper, G. Pohnert, K. Kusel

Date Published: 1st Feb 2017

Publication Type: Not specified

PubMed ID: 28140394

Citation: ISME J. 2017 May;11(5):1075-1086. doi: 10.1038/ismej.2016.186. Epub 2017 Jan 31.

Created: 8th May 2017 at 09:55, Last updated: 9th Feb 2023 at 08:34

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