Multiple energy sources and metabolic strategies sustain microbial diversity in Antarctic desert soils

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dc.contributor.authorOrtiz, Maximiliano
dc.contributor.authorLeung, Pok Man
dc.contributor.authorShelley, Guy
dc.contributor.authorJirapanjawat, Thanavit
dc.contributor.authorNauer, Philipp A.
dc.contributor.authorVan Goethem, Marc W.
dc.contributor.authorBay, Sean K.
dc.contributor.authorIslam, Zahra F.
dc.contributor.authorJordaan, Karen
dc.contributor.authorVikram, Surendra
dc.contributor.authorChown, Steven L.
dc.contributor.authorHogg, Ian D.
dc.contributor.authorMakhalanyane, Thulani P.
dc.contributor.authorGrinter, Rhys
dc.contributor.authorCowan, Don A.
dc.contributor.authorGreening, Chris
dc.date.accessioned2025-01-20T22:05:09Z
dc.date.available2025-01-20T22:05:09Z
dc.date.issued2021
dc.description.abstractNumerous diverse microorganisms reside in the cold desert soils of continental Antarctica, though we lack a holistic understanding of the metabolic processes that sustain them. Here, we profile the composition, capabilities, and activities of the microbial communities in 16 physicochemically diverse mountainous and glacial soils. We assembled 451 metagenome-assembled genomes from 18 microbial phyla and inferred through Bayesian divergence analysis that the dominant lineages present are likely native to Antarctica. In support of earlier findings, metagenomic analysis revealed that the most abundant and prevalent microorganisms are metabolically versatile aerobes that use atmospheric hydrogen to support aerobic respiration and sometimes carbon fixation. Surprisingly, however, hydrogen oxidation in this region was catalyzed primarily by a phylogenetically and structurally distinct enzyme, the group 1l [NiFe]-hydrogenase, encoded by nine bacterial phyla. Through gas chromatography, we provide evidence that both Antarctic soil communities and an axenic Bacteroidota isolate (Hymenobacter roseosalivarius) oxidize atmospheric hydrogen using this enzyme. Based on ex situ rates at environmentally representative temperatures, hydrogen oxidation is theoretically sufficient for soil communities to meet energy requirements and, through metabolic water production, sustain hydration. Diverse carbon monoxide oxidizers and abundant methanotrophs were also active in the soils. We also recovered genomes of microorganisms capable of oxidizing edaphic inorganic nitrogen, sulfur, and iron compounds and harvesting solar energy via microbial rhodopsins and conventional photosystems. Obligately symbiotic bacteria, including Patescibacteria, Chlamydiae, and predatory Bdellovibrionota, were also present. We conclude that microbial diversity in Antarctic soils reflects the coexistence of metabolically flexible mixotrophs with metabolically constrained specialists.
dc.fuente.origenWOS
dc.identifier.doi10.1073/pnas.2025322118
dc.identifier.issn0027-8424
dc.identifier.urihttps://doi.org/10.1073/pnas.2025322118
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94125
dc.identifier.wosidWOS:000720926900016
dc.issue.numero45
dc.language.isoen
dc.revistaProceedings of the national academy of sciences of the united states of america
dc.rightsacceso restringido
dc.subjectAntarctica
dc.subjectactinobacteria
dc.subjecttrace gas
dc.subjectmetabolic water
dc.subjecthydrogen
dc.subject.ods15 Life on Land
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.titleMultiple energy sources and metabolic strategies sustain microbial diversity in Antarctic desert soils
dc.typeartículo
dc.volumen118
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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