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Sulfate is essential for Ferroplasma acidarmanus growth, supporting DNA integrity and ATP production. Its absence or the presence of molybdate severely impacts cell viability and biomolecules in this acidophile.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Environmental Science

Background:

  • Sulfate is a crucial sulfur source for microbes, acting as an electron acceptor in some prokaryotes.
  • The acidophile Ferroplasma acidarmanus requires high sulfate concentrations (≥150 mM) for growth.
  • Sulfate assimilation in F. acidarmanus produces proteins and volatile organic sulfur compounds.

Purpose of the Study:

  • To investigate the impact of sulfate deprivation and molybdate presence on F. acidarmanus viability.
  • To monitor changes in genomic DNA and ATP content as indicators of cell health.
  • To understand the role of sulfate in maintaining cellular integrity in F. acidarmanus.

Main Methods:

  • Monitoring cell viability, genomic DNA, and ATP content in F. acidarmanus cultures.
  • Comparing responses to sulfate absence versus the presence of sulfate analog molybdate (MoO(4) (2-)).
  • Quantifying reductions in cell numbers, DNA, and ATP over specific time periods.

Main Results:

  • Sulfate absence caused a >7 log(10) decrease in viable cells, >99% DNA reduction (3 days), and >60% ATP decrease (6 hours).
  • Molybdate exposure led to >2 log(10) viability loss (5 days), >60% DNA reduction (2 days), and >70% ATP decrease (2 hours).
  • Both sulfate deprivation and molybdate presence similarly affected cell viability and essential biomolecules.

Conclusions:

  • Sulfate is critical for maintaining ATP content and DNA integrity in F. acidarmanus.
  • Sulfate deprivation and molybdate exposure induce comparable detrimental effects on cell viability.
  • Findings may extend to other acidophiles thriving in sulfate-rich environments.