Cultivation and visualization of a methanogen of the phylum Thermoproteota

• 成果类型: Article
• 署名作者: Kohtz, Anthony J.; Petrosian, Nikolai; Krukenberg, Viola; Jay, Zackary J.; Pilhofer, Martin; Hatzenpichler, Roland
• 署名单位: Montana State University System; Montana State University Bozeman; Montana State University System; Montana State University Bozeman; Swiss Federal Institutes of Technology Domain; ETH Zurich; Montana State University System; Montana State University Bozeman
• 刊物名称: Nature
• ISSN/ISSBN: 0028-5447
• DOI: 10.1038/s41586-024-07631-6
• 发表日期: 2024-08-29
• 页码: 1118-+
• 关键词: multiple sequence alignment; in-situ hybridization; oligonucleotide probes; sp nov.; hydrogenase; desulfovibrio; performance; metabolism; inference; relevant

摘要

Methane is the second most abundant climate-active gas, and understanding its sources and sinks is an important endeavour in microbiology, biogeochemistry, and climate sciences(1,2). For decades, it was thought that methanogenesis, the ability to conserve energy coupled to methane production, was taxonomically restricted to a metabolically specialized group of archaea, the Euryarchaeota(1). The discovery of marker genes for anaerobic alkane cycling in metagenome-assembled genomes obtained from diverse habitats has led to the hypothesis that archaeal lineages outside the Euryarchaeota are also involved in methanogenesis(3-6). Here we cultured Candidatus Methanosuratincola verstraetei strain LCB70, a member of the archaeal class Methanomethylicia (formerly Verstraetearchaeota) within the phylum Thermoproteota, from a terrestrial hot spring. Growth experiments combined with activity assays, stable isotope tracing, and genomic and transcriptomic analyses demonstrated that this thermophilic archaeon grows by means of methyl-reducing hydrogenotrophic methanogenesis. Cryo-electron tomography revealed that Ca. M. verstraetei are coccoid cells with archaella and chemoreceptor arrays, and that they can form intercellular bridges connecting two to three cells with continuous cytoplasm and S-layer. The wide environmental distribution of Ca. M. verstraetei suggests that they might play important and hitherto overlooked roles in carbon cycling within diverse anoxic habitats.