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An efficient cyanide-degrading Bacillus pumilus strain.

P R Meyers1, P Gokool, D E Rawlings

  • 1Department of Microbiology, University of Cape Town, South Africa.

Journal of General Microbiology
|June 1, 1991
PubMed
Summary

Bacillus pumilus efficiently degrades cyanide, a toxic compound. This bacterial cyanide degradation is linked to growth phase and requires manganese, with activity found intracellularly.

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Area of Science:

  • Microbiology
  • Environmental Science
  • Bioremediation

Background:

  • Cyanide is a highly toxic compound, posing significant environmental and health risks.
  • Microbial degradation offers a promising bioremediation strategy for cyanide-contaminated sites.
  • Identifying microorganisms with robust cyanide-degrading capabilities is crucial for developing effective treatment solutions.

Purpose of the Study:

  • To isolate and identify a bacterium capable of degrading free cyanide.
  • To characterize the growth-phase dependency and optimal conditions for cyanide degradation.
  • To determine the cellular location of the cyanide-degrading activity.

Main Methods:

  • Enrichment culture technique using cyanide as a sole nitrogen source.
  • Bacterial identification using standard microbiological and biochemical tests.
  • Growth curve analysis and determination of cyanide degradation rates at different growth phases.
  • Enzyme assays using cell-free extracts to confirm intracellular activity.
  • Investigation of manganese ion (Mn2+) concentration effects on enzyme production.

Main Results:

  • A Gram-positive, aerobic, endospore-forming bacterium, identified as Bacillus pumilus, was isolated.
  • The Bacillus pumilus strain rapidly degraded 100 mg/L of free cyanide without additional nutrients.
  • Cyanide degradation activity was observed only during the late exponential/early stationary growth phases.
  • Manganese ions (Mn2+) were essential for enzyme production, with optimal activity at 0.01 mg/L.
  • Cyanide degradation activity was confirmed to be intracellular, as cell-free extracts also degraded cyanide.

Conclusions:

  • Bacillus pumilus is a potent cyanide-degrading bacterium with potential applications in bioremediation.
  • The regulation of cyanide degradation is linked to bacterial growth phase and requires specific manganese concentrations.
  • The intracellular nature of the enzyme facilitates cyanide detoxification within the bacterial cell.

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