Isolation of an archaeon at the prokaryote–eukaryote interface
| Autor: | Tetsuro Ikuta, Eiji Tasumi, Miyuki Ogawara, Hideyuki Tamaki, Yoichi Kamagata, Takashi Yamaguchi, Chihong Song, Yoshihiro Takaki, Yumi Saito, Masayuki Miyazaki, Yohei Matsui, Katsuyuki Uematsu, Ken Takai, Masaru K. Nobu, Sanae Sakai, Hiroyuki Imachi, Yuki Morono, Motoo Ito, Kazuyoshi Murata, Yuko Yamanaka, Nozomi Nakahara, Yoshinori Takano |
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| Rok vydání: | 2020 |
| Předmět: |
Geologic Sediments
Lineage (evolution) Genomics Review Article Models Biological Genome Article Evolution Molecular 03 medical and health sciences Symbiosis Syntrophy Archaeal evolution Genome Archaeal Phylogenetics Lokiarchaeota Amino Acids Phylogeny 030304 developmental biology 0303 health sciences Multidisciplinary biology 030306 microbiology Eukaryota Prokaryote biology.organism_classification Archaea Lipids Eukaryotic Cells Prokaryotic Cells Evolutionary biology Candidatus Eukaryote Archaeal biology |
| Zdroj: | Fac Rev Nature |
| ISSN: | 1476-4687 0028-0836 |
| Popis: | The origin of eukaryotes remains unclear1–4. Current data suggest that eukaryotes may have emerged from an archaeal lineage known as ‘Asgard’ archaea5,6. Despite the eukaryote-like genomic features that are found in these archaea, the evolutionary transition from archaea to eukaryotes remains unclear, owing to the lack of cultured representatives and corresponding physiological insights. Here we report the decade-long isolation of an Asgard archaeon related to Lokiarchaeota from deep marine sediment. The archaeon—‘Candidatus Prometheoarchaeum syntrophicum’ strain MK-D1—is an anaerobic, extremely slow-growing, small coccus (around 550 nm in diameter) that degrades amino acids through syntrophy. Although eukaryote-like intracellular complexes have been proposed for Asgard archaea6, the isolate has no visible organelle-like structure. Instead, Ca. P. syntrophicum is morphologically complex and has unique protrusions that are long and often branching. On the basis of the available data obtained from cultivation and genomics, and reasoned interpretations of the existing literature, we propose a hypothetical model for eukaryogenesis, termed the entangle–engulf–endogenize (also known as E3) model. Isolation and characterization of an archaeon that is most closely related to eukaryotes reveals insights into how eukaryotes may have evolved from prokaryotes. |
| Databáze: | OpenAIRE |
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