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Related Experiment Videos

Dissimilatory Fe(III) and Mn(IV) reduction.

Derek R Lovley1, Dawn E Holmes, Kelly P Nevin

  • 1Department of Microbiology, University of Massachusetts-Amherst, Amherst, MA 01003, USA. dlovley@microbio.umass.edu

Advances in Microbial Physiology
|November 3, 2004
PubMed
Summary

Dissimilatory iron (Fe(III)) and manganese (Mn(IV)) reduction is crucial for geochemistry and bioremediation. Microorganisms, like Geobacter species, have diverse strategies for reducing insoluble metal oxides, impacting environmental processes.

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Area of Science:

  • Microbiology and Geochemistry
  • Environmental Science

Background:

  • Dissimilatory iron (Fe(III)) and manganese (Mn(IV)) reduction significantly influences environmental geochemistry.
  • Fe(III)-reducing microorganisms, particularly Geobacteraceae, are vital for bioremediation of contaminated subsurface environments.
  • These metal-reducing microbes are phylogenetically diverse across Bacteria and Archaea.

Purpose of the Study:

  • To explore the diverse mechanisms of Fe(III) and Mn(IV) reduction in microorganisms.
  • To understand the physiological adaptations of Fe(III)- and Mn(IV)-reducing microbes.
  • To elucidate the role of these microbes in geochemical cycling and bioremediation.

Main Methods:

  • Comparative analysis of Fe(III) and Mn(IV) reduction strategies.
  • Investigation of electron transfer mechanisms in representative species like Geobacter, Shewanella, and Geothrix.

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  • Genomic and physiological characterization of metal-reducing microorganisms.

    • Main Results:

    • Fe(III)- and Mn(IV)-reducing microorganisms exhibit varied strategies for interacting with insoluble metal oxides.
    • Geobacter species require direct contact with Fe(III) oxides, utilizing pili and flagella.
    • Shewanella and Geothrix species employ chelators and electron-shuttling compounds for extracellular electron transfer.
    • Distinct electron transport chains involving c-type cytochromes are observed in Geobacter and Shewanella.

    Conclusions:

    • The capacity for Fe(III) reduction has evolved multiple times, leading to diverse microbial strategies.
    • Geobacter species' physiological traits explain their prevalence in sedimentary environments.
    • Understanding these microbial processes is essential for environmental applications like bioremediation.