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Related Experiment Videos

Iron uptake by Escherichia coli.

Volkmar Braun1

  • 1Mikrobiologie/Membranphysiologie, Universität Tübingen, Auf der Morgenstelle 28, D-72076 Tübingen, Germany. volkmar.braun@mikrobio.uni-tuebingen.de

Frontiers in Bioscience : a Journal and Virtual Library
|September 6, 2003
PubMed
Summary

Escherichia coli utilizes specific outer membrane proteins and ABC transporters for iron uptake, powered by the proton motive force and TonB-ExbB-ExbD system. Despite structural insights, the precise mechanism of channel opening and regulation remains under investigation.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Molecular Biology

Background:

  • Escherichia coli requires ferric iron, obtained via various chelating compounds.
  • Iron transport involves specific outer membrane proteins and less specific ABC transporters.
  • Energy for outer membrane transport is supplied by the proton motive force via the TonB-ExbB-ExbD complex.

Purpose of the Study:

  • To elucidate the mechanisms of iron transport in Escherichia coli.
  • To understand the role of structural changes and energy input in transport protein function.
  • To explore the transcriptional regulation of iron transport genes by the Fur protein.

Main Methods:

  • Analysis of crystal structures of outer membrane transport proteins.
  • Genetic and biochemical experiments.

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  • Investigation of transcriptional regulation by the Fur protein.

    • Main Results:

    • Substrate binding induces structural changes but does not open transport channels.
    • Energy input from the cytoplasmic membrane is hypothesized to open channels.
    • Fur protein regulates iron transport gene transcription, acting as a repressor when bound to ferrous iron.

    Conclusions:

    • The TonB-ExbB-ExbD system is crucial for energy transduction in outer membrane iron transport.
    • While structural and genetic data provide a basic understanding, fundamental questions about transport mechanisms persist.
    • Regulation of iron transport, exemplified by ferric citrate transport, serves as a paradigm for other biological systems.