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Related Experiment Videos

Aerobic chromate reduction by Bacillus subtilis

C Garbisu1, I Alkorta, M J Llama

  • 1Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias, Universidad del País Vasco, Bilbao, Spain.

Biodegradation
|November 20, 1998
PubMed
Summary

Bacillus subtilis effectively reduces toxic hexavalent chromium to trivalent chromium. This bacterial detoxification system functions independently of nitrate and involves soluble proteins, not membranes.

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Area of Science:

  • Environmental microbiology
  • Bioremediation
  • Biochemistry

Background:

  • Hexavalent chromium (Cr(VI)) is a toxic environmental pollutant.
  • Microbial reduction of Cr(VI) to less toxic Cr(III) is a key bioremediation strategy.
  • Understanding the microbial mechanisms of chromate reduction is crucial for effective environmental cleanup.

Purpose of the Study:

  • To investigate the ability of Bacillus subtilis to reduce chromate.
  • To characterize the biochemical system responsible for chromate reduction in B. subtilis.
  • To determine if chromate reduction is part of a detoxification pathway or dissimilatory electron transport.

Main Methods:

  • Culturing Bacillus subtilis in the presence of potassium chromate (K2CrO4).
  • Assessing chromate reduction using cell suspensions and cell-free extracts.

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  • Investigating the effects of nitrate, metabolic poisons (sodium azide, sodium cyanide), and heat on reduction activity.
  • Determining the subcellular localization (soluble vs. membrane fraction) and kinetic parameters (Km) of the reductase.
  • Evaluating the role of NAD(P)H as an electron donor.

    • Main Results:

    • Bacillus subtilis effectively reduced chromate at concentrations up to 1 mM K2CrO4.
    • Chromate reduction was not inhibited by a 20-fold excess of nitrate.
    • Metabolic poisons inhibited chromate reduction, indicating an active biological process.
    • The reductase activity was found in the soluble protein fraction, was heat labile, and had a Km of 188 μM for chromate.
    • The reductase utilized NAD(P)H as an electron donor.

    Conclusions:

    • Bacillus subtilis possesses a robust system for reducing toxic hexavalent chromium.
    • The chromate reduction system in B. subtilis is constitutive, associated with soluble proteins, and functions as a detoxification mechanism.
    • This bacterial reductase system appears to mediate chromate detoxification rather than dissimilatory electron transport, offering a promising avenue for bioremediation.