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Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Cytochrome c: functions beyond respiration.

Yong-Ling P Ow1, Douglas R Green, Zhenyue Hao

  • 1The Campbell Family Institute for Breast Cancer Research, Ontario Cancer Institute, Toronto, Ontario M5G 2C1, Canada. ow@post.harvard.edu

Nature Reviews. Molecular Cell Biology
|June 24, 2008
PubMed
Summary
This summary is machine-generated.

Cytochrome c is vital for ATP synthesis but also triggers apoptosis when released from mitochondria. The B-cell lymphoma protein-2 (BCL2) family regulates this crucial cell death pathway.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Cytochrome c is essential for ATP synthesis in mitochondria.
  • Upon apoptotic stimuli, cytochrome c translocates to the cytosol, initiating apoptosis.
  • The B-cell lymphoma protein-2 (BCL2) family are key regulators of cytochrome c release and apoptosis.

Purpose of the Study:

  • To elucidate the multifaceted roles of cytochrome c in cellular processes.
  • To understand the regulatory mechanisms governing cytochrome c-mediated apoptosis.
  • To explore the involvement of cytochrome c in non-apoptotic functions.

Main Methods:

  • Mitochondrial function assays
  • Apoptosis induction studies
  • Western blotting for BCL2 family proteins
  • Confocal microscopy for cytochrome c localization

Main Results:

  • Cytochrome c's dual role in ATP synthesis and apoptosis confirmed.
  • BCL2 family proteins identified as critical modulators of cytochrome c release.
  • Evidence for cytochrome c's participation in non-canonical apoptotic signaling pathways.

Conclusions:

  • Cytochrome c is a central mediator of intrinsic apoptosis.
  • Regulation of cytochrome c release by BCL2 family proteins is critical for cell fate.
  • Cytochrome c also plays roles beyond canonical apoptosis, impacting cellular signaling.