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Precise, High-throughput Analysis of Bacterial Growth
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Formate-driven growth coupled with H(2) production.

Yun Jae Kim1, Hyun Sook Lee, Eun Sook Kim

  • 1Korea Ocean Research & Development Institute, PO Box 29, Ansan 425-600, Korea.

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Certain hyperthermophilic archaea can grow using only formate as an energy source, producing hydrogen. This formate metabolism is energetically favorable for single strains, unlike previously observed syntrophic communities.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Archaea

Background:

  • The conversion of formate to bicarbonate and H(2) (ΔG° = +1.3 kJ mol⁻¹) was previously considered energetically insufficient for microbial growth.
  • Previous studies demonstrated formate-driven growth in syntrophic microbial communities, relying on hydrogen consumption by methanogens to make the reaction exergonic.

Purpose of the Study:

  • To investigate if a single microorganism can grow using formate as a sole energy source, catalyzing its conversion to bicarbonate and H(2).
  • To elucidate the biochemical mechanisms underlying formate metabolism and energy generation in hyperthermophilic archaea.

Main Methods:

  • Cultivation of hyperthermophilic archaea, specifically Thermococcus onnurineus strain NA1, with formate as the sole energy source.
  • Measurement of Gibbs free energy (ΔG) changes under physiological growth conditions.
  • Detection of ATP synthesis in the presence of formate.
  • Gene expression profiling and gene disruption experiments to identify key genes involved in formate metabolism.

Main Results:

  • Several hyperthermophilic archaea, including Thermococcus onnurineus strain NA1, demonstrated the ability to grow by oxidizing formate and producing H(2).
  • The calculated actual ΔG values for formate metabolism ranged from -8 to -20 kJ mol⁻¹, indicating an exergonic process under growth conditions.
  • ATP synthesis was confirmed when formate was the only energy source.
  • A specific gene cluster encoding formate hydrogen lyase, cation/proton antiporter, and formate transporter was identified as crucial for formate-driven growth.

Conclusions:

  • This study provides the first evidence of formate-driven growth by a single microorganism, utilizing protons as the electron acceptor.
  • The identified gene cluster provides the biochemical basis for this unique metabolic capability in Thermococcus onnurineus NA1.
  • This finding expands our understanding of microbial energy metabolism and the potential for life in energy-limited environments.