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Asgard archaea illuminate the origin of eukaryotic cellular complexity

Journal Article · · Nature (London)
DOI:https://doi.org/10.1038/nature21031· OSTI ID:1580084
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [4];  [5];  [3];  [1];  [1]
  1. Uppsala Univ. (Sweden). Dept. of Cell and Molecular Biology, Science for Life Lab.
  2. Uppsala Univ. (Sweden). Dept. of Cell and Molecular Biology, Science for Life Lab.; Ghent Univ. (Belgium). Dept. of Plant Systems Biology, VIB and Dept. of Plant Biotechnology and Bioinformatics
  3. Univ. of Texas-Austin, Port Aransas, TX (United States). Dept. of Marine Science, Marine Science Inst.
  4. Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Sciences and Dept. of Environmental Science, Policy, and Management
  5. Aarhus Univ. (Denmark). Dept. of Bioscience, Section for Microbiology and Center for Geomicrobiology
  6. GNS Science, Taupō (New Zealand). Extremophile Research Group
  7. Japan Agency for Marine-Earth Science and Technology, Yokosuka (Japan). Research and Development Center for Marine Biosciences
The origin and cellular complexity of eukaryotes represent a major enigma in biology. Current data support scenarios in which an archaeal host cell and an alphaproteobacterial (mitochondrial) endosymbiont merged together, resulting in the first eukaryotic cell. The host cell is related to Lokiarchaeota, an archaeal phylum with many eukaryotic features. The emergence of the structural complexity that characterizes eukaryotic cells remains unclear. In this report we describe the 'Asgard' superphylum, a group of uncultivated archaea that, as well as Lokiarchaeota, includes Thor-, Odin- and Heimdallarchaeota. Asgard archaea affiliate with eukaryotes in phylogenomic analyses, and their genomes are enriched for proteins formerly considered specific to eukaryotes. Interestingly, thorarchaeal genomes encode several homologues of eukaryotic membrane-trafficking machinery components, including Sec23/24 and TRAPP domains. Furthermore, we identify thorarchaeal proteins with similar features to eukaryotic coat proteins involved in vesicle biogenesis. Our results expand the known repertoire of 'eukaryote-specific' proteins in Archaea, suggesting that the archaeal host cell already contained many key components that govern eukaryotic cellular complexity.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1580084
Journal Information:
Nature (London), Journal Name: Nature (London) Journal Issue: 7637 Vol. 541; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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