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Related Experiment Videos

Selenium metabolism in Escherichia coli

R J Turner1, J H Weiner, D E Taylor

  • 1Department of Biological Sciences, University of Calgary, Alberta, Canada. turnerr@acs.ucalgary.ca

Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
|December 16, 1998
PubMed
Summary

Escherichia coli metabolizes toxic selenium compounds, reducing selenite and selenate to elemental selenium. This review explores key intermediates and pathways in bacterial selenium detoxification.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Environmental Science

Background:

  • Escherichia coli can transform toxic selenite and selenate oxyanions.
  • Selenium incorporation into proteins occurs via selenocysteine and selenomethionine.

Purpose of the Study:

  • To review the metabolic pathways of selenium in Escherichia coli.
  • To identify key intermediates in selenium detoxification.

Main Methods:

  • Literature review of selenium metabolism in E. coli.
  • Analysis of biochemical reactions involving selenium and glutathione.

Main Results:

  • Escherichia coli reduces selenite and selenate to elemental selenium (Se0).
  • Selenodiglutathione (GS-Se-GS) and glutathioselenol (GS-SeH) are identified as crucial intermediates.

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  • Selenium is incorporated into selenocysteine and selenomethionine.

    • Conclusions:

    • Understanding selenium metabolic pathways in E. coli is vital for comprehending metalloid oxyanion metabolism.
    • Key intermediates like GS-Se-GS and GS-SeH are central to selenium detoxification processes.