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Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like...
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Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
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"Altiarchaeales": uncultivated archaea from the subsurface.

Alexander J Probst1, Christine Moissl-Eichinger2,3

  • 1Department of Earth and Planetary Science, University of California, Berkeley, 307 McCone Hall, Berkeley, CA 94720, USA. alexander.j.probst@gmail.com.

Life (Basel, Switzerland)
|May 19, 2015
PubMed
Summary
This summary is machine-generated.

Uncultivated Archaea, Altiarchaeales, are abundant in Earth's deep crust, potentially fixing carbon. Research on "Candidatus Altiarchaeum hamiconexum" reveals unique biology and ecological importance.

Keywords:
Archaeahamisubsurfacesulfidic springsuncultivated

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Area of Science:

  • Microbiology
  • Environmental Genomics
  • Archaea Biology

Background:

  • Limited cultivability of microorganisms necessitates advanced techniques like environmental genomics.
  • Altiarchaeales represent a newly proposed order-level lineage of uncultivated Archaea.
  • "Candidatus Altiarchaeum hamiconexum" (Ca. A. hamiconexum) is the most studied representative.

Purpose of the Study:

  • To review scientific findings on the Altiarchaeales lineage.
  • To highlight the complex biology and ecological significance of Ca. A. hamiconexum.
  • To discuss the potential role of Altiarchaeales in subsurface carbon fixation.

Main Methods:

  • Environmental genomics and state-of-the-art technologies.
  • Analysis of genomic information from diverse biotopes.
  • Review of over a decade of research on Ca. A. hamiconexum.

Main Results:

  • Ca. A. hamiconexum exhibits unique traits: strict anaerobicity, pure biofilm formation via "hami" appendages, and a double-membrane cell wall.
  • Altiarchaeales are abundant in deep, anoxic groundwater.
  • Genomic data suggests Altiarchaeales play a crucial role in subsurface carbon fixation.

Conclusions:

  • Altiarchaeales, particularly Ca. A. hamiconexum, are significant primary producers in subsurface ecosystems.
  • Despite being uncultivated, extensive research has elucidated many aspects of Ca. A. hamiconexum's lifestyle, genomics, metabolism, and ultrastructure.
  • This archaeon is one of the best-studied examples of uncultivated Archaea, offering insights into deep biosphere processes.