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Prediction of eukaryotic cellular complexity in Asgard archaea using structural modelling.

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Asgard archaea, crucial for eukaryotic cell origins, possess more complex, eukaryote-like proteins than previously known. This study reveals novel protein structures, expanding our understanding of early cellular evolution.

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Area of Science:

  • Origin of eukaryotes
  • Archaea genomics
  • Protein structure analysis

Background:

  • Asgard archaea are key to eukaryotic cell origins, encoding proteins related to eukaryotic signature proteins (ESPs).
  • Reconstructing the Asgard archaeal ancestor's complexity is challenging due to fragmented gene distribution and missing protein homologues.

Purpose of the Study:

  • To build a structural catalogue of the Asgard archaeal pangenome.
  • To identify eukaryotic-like proteins in Asgard archaea using advanced computational methods.

Main Methods:

  • De novo protein structure modeling.
  • Sequence similarity detection across an expanded Asgard archaeal genomic dataset.
  • Identification of 'isomorphic' ESPs with structural similarity to eukaryotic proteins.

Main Results:

  • Identified 908 'isomorphic' ESPs, bridging deep sequence divergence between Asgard archaea and eukaryotes.
  • These proteins are involved in information storage, processing, and cellular organization.
  • Discovered components of eukaryotic Vault (MVP) and Commander (COMMD) complexes in Asgard archaea.

Conclusions:

  • Asgard archaea possess a greater repertoire of eukaryotic-like proteins than previously recognized.
  • This suggests a higher degree of cellular complexity in the archaeal ancestor of eukaryotes.
  • Findings enhance our understanding of early cellular evolution and the transition to eukaryotic life.