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Related Concept Videos

Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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...
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...
The Supercomplexes in the Crista Membrane01:41

The Supercomplexes in the Crista Membrane

The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...

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Related Experiment Video

Updated: Jun 3, 2026

Isolation of Mitochondria for Mitochondrial Supercomplex Analysis from Small Tissue and Cell Culture Samples
05:45

Isolation of Mitochondria for Mitochondrial Supercomplex Analysis from Small Tissue and Cell Culture Samples

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Mitochondrial complex I: a central regulator of the aging process.

Rhoda Stefanatos1, Alberto Sanz

  • 1Beatson Institute for Cancer Research; Cancer Research UK, Glasgow, UK.

Cell Cycle (Georgetown, Tex.)
|April 8, 2011
PubMed
Summary

Mitochondria

Area of Science:

  • Mitochondrial biology
  • Aging research
  • Genetics

Background:

  • Mitochondria are key regulators of aging.
  • The precise role of mitochondrial complex I in aging remains unclear.
  • Reactive oxygen species (ROS) from complex I negatively correlate with lifespan.

Purpose of the Study:

  • To review evidence for and against complex I as a pacemaker of aging.
  • To explore the dual role of complex I in regulating lifespan.
  • To investigate mechanisms linking complex I to aging.

Main Methods:

  • Review of existing data on complex I and aging.
  • Experimental manipulation of ROS production in Drosophila melanogaster's electron transport chain (ETC).
  • Analysis of lifespan changes in response to complex I bypass.

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Last Updated: Jun 3, 2026

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Main Results:

  • Bypassing complex I in Drosophila melanogaster extended lifespan.
  • The lifespan extension may be due to reduced ROS or altered NAD+/NADH ratio.
  • Complex I influences aging via ROS-dependent and independent pathways.

Conclusions:

  • Complex I regulates aging through ROS-dependent mitochondrial DNA damage.
  • Complex I also regulates aging via ROS-independent control of the NAD+/NADH ratio.
  • NAD+/NADH ratio impacts glyco- and lipoxidative damage and sirtuin activation.