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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...

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ACT1-CUP1 Assays Determine the Substrate-Specific Sensitivities of Spliceosomal Mutants in Budding Yeast
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Copper exposure effects on yeast mitochondrial proteome.

Lucia Banci1, Ivano Bertini, Simone Ciofi-Baffoni

  • 1Magnetic Resonance Center CERM and Department of Chemistry, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy.

Journal of Proteomics
|May 10, 2011
PubMed
Summary

This study reveals that copper exposure activates survival pathways in yeast mitochondria, protecting them from oxidative stress. Copper

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Assessment of Submitochondrial Protein Localization in Budding Yeast Saccharomyces cerevisiae
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Area of Science:

  • Cell Biology
  • Biochemistry
  • Proteomics

Background:

  • Mitochondria are crucial for cellular copper homeostasis.
  • Altered copper levels impact mitochondrial proteome and cellular function.
  • Understanding copper's cellular effects is vital.

Purpose of the Study:

  • To investigate the effects of non-lethal copper concentration on the Saccharomyces cerevisiae mitochondrial proteome.
  • To elucidate copper's role in cellular responses to oxidative stress.

Main Methods:

  • Organelle-targeted proteomics using 2D electrophoresis (2-DE).
  • Liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS).
  • Unsupervised meta-analysis of proteomic data.

Main Results:

  • Copper treatment impaired mitochondrial function and induced oxidative stress response.
  • A yeast survival pathway was activated by copper-induced stress.
  • Copper demonstrated a protective role against hydrogen peroxide-induced stress.

Conclusions:

  • Copper may protect against oxidative stress by activating cellular survival and growth mechanisms.
  • This highlights a novel role for copper in cellular defense.
  • Further research into copper's protective mechanisms is warranted.