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Viruses of Archaea01:29

Viruses of Archaea

Archaeal viruses play a crucial role in the ecosystems of extremophilic archaea, particularly those belonging to the phyla Euryarchaeota and Crenarchaeota. By shaping host evolution and facilitating gene transfer, these viruses influence microbial communities and contribute to genetic diversity in extreme environments. The archaea they infect thrive in acidic hot springs and hydrothermal vents characterized by high temperatures and low pH. Archaeal viruses exhibit remarkable structural...
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Related Experiment Video

Updated: May 31, 2026

Quantitative Approaches for Scoring in vivo Neuronal Aggregate and Organelle Extrusion in Large Exopher Vesicles in C. elegans
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Quantitative Approaches for Scoring in vivo Neuronal Aggregate and Organelle Extrusion in Large Exopher Vesicles in C. elegans

Published on: September 18, 2020

The archaeal exosome.

Elena Evguenieva-Hackenberg1

  • 1Institut für Mikrobiologie und Molekularbiologie, University of Giessen, Giessen, Germany, Elena.Evguenieva-Hackenberg@mikro.bio.uni-giessen.de.

Advances in Experimental Medicine and Biology
|June 30, 2011
PubMed
Summary

The archaeal exosome, a protein complex, degrades RNA and synthesizes RNA tails. Its functions are similar to bacterial PNPase, highlighting conserved RNA processing in Archaea.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Archaea Research

Background:

  • The archaeal exosome is a protein complex structurally similar to eukaryotic exosomes and bacterial polynucleotide phosphorylase (PNPase).
  • Its core comprises alternating Rrp41 and Rrp42 subunits in a hexameric ring, with a flexible RNA-binding cap (Rrp4/Csl4) for substrate recruitment and unwinding.
  • An archaea-specific DnaG subunit's function remains uncharacterized.

Purpose of the Study:

  • To elucidate the structure and function of the archaeal exosome.
  • To compare archaeal RNA processing with bacterial and eukaryotic systems.
  • To investigate the role of the archaea-specific DnaG subunit.

Main Methods:

  • Structural analysis of the archaeal exosome complex.

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Isolation and Characterization of RNA-Containing Exosomes
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Published on: January 9, 2012

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Isolation and Characterization of RNA-Containing Exosomes
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Isolation and Characterization of RNA-Containing Exosomes

Published on: January 9, 2012

  • Biochemical assays to determine RNA degradation and synthesis activity.
  • Comparative genomics to identify conserved and unique subunits.

    • Main Results:

    • The archaeal exosome degrades RNA phosphorolytically in the 3' to 5' direction.
    • It can synthesize heteropolymeric RNA tails using nucleoside diphosphates in a reverse reaction.
    • Functional similarities were observed between the archaeal exosome and bacterial PNPase.

    Conclusions:

    • The archaeal exosome plays crucial roles in RNA degradation and posttranscriptional modification.
    • These processes in Archaea are functionally analogous to those in Bacteria and organelles.
    • The study provides insights into the conserved nature of fundamental RNA metabolism pathways across different domains of life.