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• W4381490410 abstract "Abstract Iron oxidizing Zetaproteobacteria are well-known to colonize deep-sea hydrothermal vent fields around the world where iron-rich fluids are discharged into oxic seawater. How inter-field and intra-field differences in geochemistry influence the diversity of Zetaproteobacteria, however, remains largely unknown. Here, we characterize Zetaproteobacteria phylogenomic diversity, metabolic potential, and morphologies of the iron oxides they form, with a focus on the recently discovered Fåvne vent field. Located along the Mohns ridge in the Arctic, this vent field is a unique study site with vent fluids containing both iron and hydrogen with thick iron microbial mats (Fe mats) covering porously venting high-temperature (227-267 °C) black smoker chimneys. Through genome-resolved metagenomics and microscopy, we demonstrate that the Fe mats at Fåvne are dominated by tubular iron oxide sheaths, likely produced by Zetaproteobacteria of genus Ghiorsea . With these structures, Ghiorsea may provide a surface area for members of other abundant taxa such as Campylobacterota, Gammaproteobacteria and Alphaproteobacteria. Furthermore, Ghiorsea likely oxidizes both iron and hydrogen present in the fluids, with several Ghiorsea populations co-existing in the same niche. Homologues of Zetaproteobacteria Ni,Fe hydrogenases and iron oxidation gene cyc2 were found in genomes of other community members, suggesting exchange of these genes could have happened in similar environments. Our study provides new insights into Zetaproteobacteria in hydrothermal vents, their diversity, energy metabolism and niche formation. Importance Knowledge on microbial iron oxidation is important for understanding the cycling of iron, carbon, nitrogen, nutrients, and metals. The current study yields important insights into the niche sharing, diversification, and Fe(III) oxyhydroxide morphology of Ghiorsea , an iron- and hydrogen oxidizing Zetaproteobacteria representative belonging to ZetaOTU9. The study proposes that Ghiorsea exhibits a more extensive morphology of Fe(III) oxyhydroxide than previously observed. Overall, the results increase our knowledge on potential drivers of Zetaproteobacteria diversity in iron microbial mats and can eventually be used to develop strategies for the cultivation of sheath-forming Zetaproteobacteria." @default.
• W4381490410 created "2023-06-22" @default.
• W4381490410 creator A5003624218 @default.
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• W4381490410 creator A5092223583 @default.
• W4381490410 creator A5092223584 @default.
• W4381490410 date "2023-06-21" @default.
• W4381490410 modified "2023-09-25" @default.
• W4381490410 title "Novel hydrogen- and iron-oxidizing sheath-producing Zetaproteobacteria thrive at the Fåvne deep-sea hydrothermal vent field" @default.
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