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TitleAn Asgard archaeon from a modern analog of ancient microbial mats.
Journal, issue, pagesCurr Biol, Vol. 36, Issue 8, Page 2090-22103.e7, Year 2026
Publish dateApr 20, 2026
AuthorsStephanie-Jane Nobs / Matthew D Johnson / Timothy J Williams / Julia Meltzer / Xabier Vázquez-Campos / Fraser I MacLeod / Keiran Rowell / Miranda Pitt / Bindusmita Paul / Doulin C Shepherd / Katharine A Michie / Iain G Duggin / Debnath Ghosal / Brendan P Burns /
PubMed AbstractOne of the most significant events in the evolution of life is the origin of the eukaryotic cell. Despite recent advances, the driving forces behind the emergence of complex eukaryotic attributes ...One of the most significant events in the evolution of life is the origin of the eukaryotic cell. Despite recent advances, the driving forces behind the emergence of complex eukaryotic attributes remain a gap in our knowledge. One model proposes that eukaryotic cells evolved via symbiosis between sulfate-reducing bacteria and hydrogen-producing archaea in ancient microbial mats. Here, we describe a highly enriched (89%) culture of a novel Asgard archaeon, Nerearchaeum marumarumayae, along with a bacterium Stromatodesulfovibrio nilemahensis from a modern microbial mat. The N. marumarumayae genome indicates that it has the capacity to produce H, acetate, formate, and sulfite, while S. nilemahensis synthesizes amino acids and vitamins that could be exchanged in a syntrophic partnership. Electron cryotomography revealed that N. marumarumayae cells produce chains of budded envelope vesicles attached to the coccoid cell body by extracellular fibers, as well as intracellular tube- and cage-like structures. Furthermore, the two species were observed directly interacting via intercellular tubular fibers assembled by the bacterium. These characteristics and interactions may reflect an early step in the symbiotic evolution of eukaryotic cells.
External linksCurr Biol / PubMed:41962538
MethodsEM (tomography)
Structure data

EMDB-69767: Nerearchaeum marumarumayae interaction with gram negative bacterium
Method: EM (tomography)

EMDB-69768: Large cell body of Nerearchaeum marumarumayae
Method: EM (tomography)

EMDB-69769: Extended cell phenotype of Nerearchaeum marumarumayae
Method: EM (tomography)

Source
  • Promethearchaeati (Asgard group)

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