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Complete genome sequence of Priestia megaterium S188, a hydrogen sulfide-degrading bacterium

Sang Hoon Kim1, Ji Hoon Song1, Remilyn M Mendoza1

  • 1Department of Animal Biotechnology, Dankook University, Cheonan 31116, Korea.

Journal of Animal Science and Technology
|June 16, 2025
PubMed

Insights

Priestia megaterium S188, a soil bacterium, can reduce hydrogen sulfide (H2S) levels, mitigating malodor in livestock farms. Its genome reveals genes involved in sulfide conversion, offering insights into odor reduction mechanisms.

Area of Science:

  • Microbiology
  • Environmental Science
  • Biotechnology

Background:

  • Priestia megaterium (formerly Bacillus megaterium) is a versatile, gram-positive bacterium inhabiting diverse environments.
  • Malodors in livestock farms are often caused by sulfur-containing compounds, notably hydrogen sulfide (H2S).
  • Reducing H2S is crucial for improving air quality and environmental conditions in agricultural settings.

Purpose of the Study:

  • To sequence and analyze the genome of Priestia megaterium S188, an isolate with H2S-reducing capabilities.
  • To identify genes responsible for the biodegradation or conversion of sulfur compounds.
  • To provide genomic insights for optimizing H2S reduction strategies in livestock farming.

Main Methods:

  • Whole-genome sequencing of Priestia megaterium S188.
  • Bioinformatic analysis to identify genes related to sulfur metabolism.
  • Comparative genomics to understand H2S assimilation and conversion pathways.

Main Results:

  • The complete genome sequence of P. megaterium S188 was determined.
  • Several putative genes involved in sulfide assimilation and conversion were identified, including O-acetylhomoserine desulfhydrase, cysteine synthases, rhodanese/sulfurtransferases, and nitrogen reductase.
  • These findings suggest potential mechanisms for H2S biodegradation by P. megaterium S188.

Conclusions:

  • The genomic information of P. megaterium S188 offers valuable insights into the microbial degradation of odor-causing sulfur compounds.
  • Identification of key genes facilitates the development of strategies to enhance H2S reduction in agricultural environments.
  • This research supports the use of P. megaterium S188 as a potential bio-remediation agent for malodor control.
Keywords:
Bacillus megateriumHydrogen sulfideMalodorPriestia

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