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Proton pumping by cytochrome oxidase: progress, problems and postulates.

D Zaslavsky1, R B Gennis

  • 1Department of Biochemistry, University of Illinois, Urbana, IL 61801, USA.

Biochimica Et Biophysica Acta
|May 17, 2000
PubMed
Summary
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Cytochrome oxidase utilizes two proton channels for translocation, crucial at different catalytic stages. Hydrogen peroxide aids in studying this enzyme mechanism and its proton-electron transfer regulation.

Area of Science:

  • Biochemistry
  • Enzyme kinetics
  • Bioenergetics

Background:

  • Cytochrome oxidase is a key enzyme in cellular respiration, responsible for proton pumping.
  • Understanding its catalytic mechanism is vital for comprehending energy transduction.

Purpose of the Study:

  • To elucidate the mechanism of proton pumping by cytochrome oxidase.
  • To investigate the roles of different proton conducting pathways.
  • To explore the enzyme's reaction with alternative substrates like hydrogen peroxide.

Main Methods:

  • Site-directed mutagenesis of bacterial oxidases to probe proton-conducting pathways.
  • Utilizing hydrogen peroxide as an alternative substrate to study enzyme kinetics.
  • Analyzing the coupling between proton transfer and electron transfer steps.

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Main Results:

  • Two distinct proton channels facilitate proton translocation at different stages of the catalytic cycle.
  • Proton transfer is coupled to and regulates electron transfer rates.
  • Hydrogen peroxide serves as a valuable tool for mechanistic investigations.
  • Mutagenesis studies reveal the importance of specific residues in proton entry.

Conclusions:

  • Proton pumping by cytochrome oxidase involves coordinated proton and electron movement.
  • Two proton channels play distinct roles in the catalytic cycle.
  • Proton transfer is integral to regulating electron transfer and enzyme turnover.