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Related Concept Videos

Diversity of Archaea IV01:29

Diversity of Archaea IV

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Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist...
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Diversity of Archaea III01:27

Diversity of Archaea III

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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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Diversity of Archaea I01:30

Diversity of Archaea I

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Archaea, a domain of single-celled microorganisms, are classified into five major phyla based on genetic and biochemical characteristics: Euryarchaeota, Crenarchaeota, Thaumarchaeota, Korarchaeota, and Nanoarchaeota. Among these, the phylum Euryarchaeota is notable for its remarkable diversity in morphology, metabolism, and ecological adaptations.Morphological and Metabolic DiversityMembers of Euryarchaeota exhibit a variety of cellular shapes, including rods and cocci. Their metabolic pathways...
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Factors Influencing Microbial Growth: Temperature01:27

Factors Influencing Microbial Growth: Temperature

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Microorganisms display remarkable adaptations, enabling them to thrive in diverse ecological niches across a wide range of temperatures. Temperature profoundly influences microbial growth by affecting enzymatic activity, membrane fluidity, and other cellular processes.Each microorganism operates within a specific temperature range defined by three cardinal points: minimum, optimum, and maximum. Below the minimum temperature, membranes lose fluidity, halting transport processes. Above the...
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Hyperthermophilic Bacteria01:21

Hyperthermophilic Bacteria

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Domain Bacteria includes some unique hyperthermophilic species. They exhibit remarkable adaptations that enable survival in extreme environments.Thermotoga species are rod-shaped, gram-negative, non-sporulating hyperthermophiles that form a sheath-like envelope called a toga. They ferment sugars or starch, producing lactate, acetate, CO₂, and H₂, and can also grow via anaerobic respiration using H₂ and ferric iron. Found in hot springs and hydrothermal vents, over 20% of their...
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Nucleoid01:24

Nucleoid

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The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...
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Growth temperature and chromatinization in archaea.

Antoine Hocher1,2, Guillaume Borrel3, Khaled Fadhlaoui4

  • 1Medical Research Council London Institute of Medical Sciences, London, UK. a.hocher@lms.mrc.ac.uk.

Nature Microbiology
|October 20, 2022
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Summary
This summary is machine-generated.

Archaea possess diverse nucleoid-associated proteins (NAPs) that vary with growth temperature. High levels of chromatinization may prevent DNA denaturation in hot environments, potentially explaining the origin of chromatin.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Evolutionary Biology

Background:

  • DNA in all cells is associated with structural proteins, forming chromatin.
  • Bacteria and eukaryotes primarily use HU and histones, respectively, for DNA packaging.
  • Archaea exhibit a wide diversity of nucleoid-associated proteins (NAPs) instead of histones.

Purpose of the Study:

  • To investigate the evolutionary and ecological factors driving the diversity of archaeal NAPs.
  • To identify specific archaeal clades with significant NAP gain and loss.
  • To correlate NAP abundance with environmental factors like temperature.

Main Methods:

  • Phylogenomic survey of known and predicted archaeal NAPs.
  • Quantitative proteomic analysis of NAPs in 19 diverse archaeal species.
  • Experimental validation of candidate NAPs in selected archaeal species (Thermoplasma volcanium, Methanomassiliicoccus luminyensis).

Main Results:

  • The Diaforarchaea clade was identified as a hotspot for NAP gene gain and loss.
  • Archaeal NAP abundance varies significantly, ranging from less than 0.03% to over 5% of total protein.
  • NAP investment levels are strongly correlated with the organism's optimal growth temperature.

Conclusions:

  • High levels of DNA compaction (chromatinization) in archaea likely evolved as a thermoprotective mechanism against DNA helix denaturation at elevated temperatures.
  • This finding provides insights into the functional role of chromatin and its potential evolutionary origins in both archaea and eukaryotes.
  • Environmental temperature is a key factor shaping the diversity and abundance of archaeal chromatin proteins.