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Related Experiment Videos

Protonmotive force generation by a redox loop mechanism.

Mika Jormakka1, Bernadette Byrne, So Iwata

  • 1Division of Biomedical Sciences, Imperial College London, London SW7 2AZ, UK. mika.jormakka@imperial.ac.uk

FEBS Letters
|June 6, 2003
PubMed
Summary

Protonmotive force (PMF) generation in bacteria utilizes a redox loop mechanism, unlike in mitochondria. The structure of formate dehydrogenase-N in Escherichia coli reveals the molecular basis for this bacterial PMF generation.

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Area of Science:

  • Biochemistry
  • Microbiology
  • Structural Biology

Background:

  • Respiration generates protonmotive force (PMF) via substrate redox reactions.
  • Mitchell's chemiosmotic theory proposed PMF generation through proton translocation.
  • Redox loops were initially hypothesized for PMF generation in mitochondria.

Purpose of the Study:

  • To review the mechanism of PMF generation in bacteria.
  • To highlight the role of protonmotive redox loops in bacterial respiration.
  • To discuss the structural basis of PMF generation by formate dehydrogenase-N.

Main Methods:

  • Review of experimental data on redox loops in mitochondria and bacteria.
  • Analysis of the nitrate respiratory pathway in Escherichia coli as a model system.

Related Experiment Videos

  • Examination of the crystal structure of formate dehydrogenase-N.

    • Main Results:

    • Experimental data refute the operation of redox loops in mitochondria.
    • Redox loops are confirmed as a key PMF generation mechanism in bacteria.
    • The structure of formate dehydrogenase-N elucidates its role in the redox loop.

    Conclusions:

    • The protonmotive redox loop is a validated mechanism for PMF generation in bacteria.
    • Formate dehydrogenase-N provides a structural understanding of redox loop function.
    • This mechanism is crucial for energy conservation in bacterial respiration.