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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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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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Area of Science:

  • Microbiology
  • Environmental Science
  • Biogeochemistry

Background:

  • Methane (CH4) and hydrogen sulfide (H2S) are produced in anoxic environments.
  • Aerobic methanotrophs consume CH4 in oxic zones, mitigating greenhouse gas emissions.
  • The impact of H2S, a toxic compound, on methanotrophs is largely unknown.

Purpose of the Study:

  • To investigate how methanotrophs are affected by hydrogen sulfide exposure.
  • To determine if methanotrophs can simultaneously oxidize methane and hydrogen sulfide.
  • To explore the biochemical mechanisms and ecological implications of this dual oxidation.

Main Methods:

  • Extensive chemostat culturing of the thermoacidophilic methanotroph Methylacidiphilum fumariolicum SolV.
  • Measurement of simultaneous oxidation rates of CH4 and H2S.
  • Analysis of gene expression, including sulfide-insensitive terminal oxidases.
  • Genomic surveys to identify sulfide-oxidizing enzymes in other methanotrophs.

Main Results:

  • Methylacidiphilum fumariolicum SolV can oxidize both CH4 and H2S simultaneously at high rates.
  • Oxidation of H2S to elemental sulfur alleviates H2S-induced inhibition of methanotrophy.
  • Strain SolV adapts to H2S by expressing a sulfide-insensitive ba3-type terminal oxidase.
  • Strain SolV can grow as a chemolithoautotroph using H2S as its sole energy source.
  • Genomic data suggest widespread H2S oxidation capabilities in methanotrophs.

Conclusions:

  • Methanotrophs, like Methylacidiphilum fumariolicum SolV, possess the ability to oxidize both methane and hydrogen sulfide.
  • This capability allows methanotrophs to mitigate CH4 emissions while also detoxifying H2S and utilizing it for energy.
  • The widespread presence of sulfide-oxidizing enzymes in methanotrophs indicates a significant, previously underappreciated role in connecting carbon and sulfur biogeochemical cycles.