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Related Experiment Videos

The multiple functions of coenzyme Q.

H Nohl1, A V Kozlov, K Staniek

  • 1Institute of Pharmacology and Toxicology, Veterinary University of Vienna, Veterinärplatz 1, Vienna, A-1210, Austria.

Bioorganic Chemistry
|April 13, 2001
PubMed
Summary

Ubiquinone (UQ) has diverse roles beyond ATP synthesis, including oxygen activation and lysosomal transport. Novel methods reveal UQ

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Area of Science:

  • Mitochondrial bioenergetics and redox biology.
  • Cellular respiration and reactive oxygen species (ROS) metabolism.
  • Membrane transport and lysosomal function.

Background:

  • Ubiquinone (UQ) is crucial for ATP synthesis via electron transfer and proton translocation in mitochondria.
  • UQ's non-coenzyme functions, particularly in oxygen activation, have been debated.
  • Previous studies suggested mitochondrial UQ redox-cycling generates superoxide (O2(.-)) as a byproduct of respiration.

Purpose of the Study:

  • To investigate the mechanisms of ubiquinone-mediated oxygen activation.
  • To explore the role of ubisemiquinones in ROS formation and interaction.
  • To elucidate UQ's bioenergetic function in lysosomal proton transport.

Main Methods:

  • Utilized novel, noninvasive, and sensitive detection methods for activated oxygen species.
  • Employed advanced experimental approaches to study UQ-mediated oxygen activation mechanisms.
  • Investigated redox interactions within mitochondria, biomembranes, and lysosomal systems.

Main Results:

  • Single electrons for superoxide formation originate exclusively from deprotonated ubisemiquinones.
  • Autoxidation of ubisemiquinones is promoted by impeded redox-interaction with the bc1 complex or lack of stabilizing interactions.
  • UQ interacts with hydrogen peroxide and nitrite, and plays a role in lysosomal proton transport via a redox chain.

Conclusions:

  • UQ's functions extend beyond mitochondrial coenzyme activity, involving complex redox interactions with oxygen and other molecules.
  • Ubisemiquinone autoxidation and interactions with ROS are key mechanisms in UQ-mediated oxygen activation.
  • UQ is integral to bioenergetics in lysosomes, participating in proton transport with oxygen as the terminal electron acceptor.

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