Department of Microbiology, Radboud Institute for Biological and Environmental Sciences, Faculty of Science, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands.
Department of Marine Microbiology and Biogeochemistry, NIOZ, P.O. Box 59, 1790 AB, Den Burg, Texel, The Netherlands.
Antonie Van Leeuwenhoek. 2024 Jul 2;117(1):94. doi: 10.1007/s10482-024-01995-5.
The Aeolian archipelago is known worldwide for its volcanic activity and hydrothermal emissions, of mainly carbon dioxide and hydrogen sulfide. Hydrogen, methane, and carbon monoxide are minor components of these emissions which together can feed large quantities of bacteria and archaea that do contribute to the removal of these notorious greenhouse gases. Here we analyzed the metagenome of samples taken from the Levante bay on Vulcano Island, Italy. Using a gene-centric approach, the hydrothermal vent community appeared to be dominated by Proteobacteria, and Sulfurimonas was the most abundant genus. Metabolic reconstructions highlight a prominent role of formaldehyde oxidation and the reverse TCA cycle in carbon fixation. [NiFe]-hydrogenases seemed to constitute the preferred strategy to oxidize H, indicating that besides HS, H could be an essential electron donor in this system. Moreover, the sulfur cycle analysis showed a high abundance and diversity of sulfate reduction genes underpinning the HS production. This study covers the diversity and metabolic potential of the microbial soil community in Levante bay and adds to our understanding of the biogeochemistry of volcanic ecosystems.
埃奥利群岛以其火山活动和水热排放而闻名于世，主要排放物为二氧化碳和硫化氢。氢、甲烷和一氧化碳是这些排放物的次要成分，它们共同为大量细菌和古菌提供养分，这些细菌和古菌有助于去除这些臭名昭著的温室气体。在这里，我们分析了来自意大利武尔卡诺岛利万特湾的样本的宏基因组。使用基因中心方法，水热喷口群落似乎主要由变形菌门主导，硫单胞菌属是最丰富的属。代谢重建突出了甲醛氧化和反向三羧酸循环在碳固定中的重要作用。[NiFe]氢化酶似乎构成了氧化 H 的首选策略，表明除了 HS 之外，H 可能是该系统中的重要电子供体。此外，硫循环分析显示了大量和多样化的硫酸盐还原基因，为 HS 的产生提供了支持。本研究涵盖了利万特湾微生物土壤群落的多样性和代谢潜力，增进了我们对火山生态系统生物地球化学的理解。
