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Related Concept Videos

The Supercomplexes in the Crista Membrane01:41

The Supercomplexes in the Crista Membrane

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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...
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Electron Transport Chain: Complex I and II01:46

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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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Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

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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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Electron Transport Chains01:28

Electron Transport Chains

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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
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The Electron Transport Chain01:30

The Electron Transport Chain

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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
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The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Related Experiment Video

Updated: Jul 13, 2025

Author Spotlight: Unveiling Oxidative Phosphorylation System Dynamics and Mitochondrial Roles in Health and Disease
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Structural rather than catalytic role for mitochondrial respiratory chain supercomplexes.

Michele Brischigliaro1,2, Alfredo Cabrera-Orefice3, Susanne Arnold3,4

  • 1Department of Biomedical Sciences, University of Padova, Padova, Italy.

Elife
|October 12, 2023
PubMed
Summary

Mitochondrial respiratory chain supercomplexes stabilize complexes under low biogenesis conditions but do not enhance respiratory catalysis. This finding contrasts with mammalian systems, highlighting differences in fruit fly mitochondria.

Keywords:
D. melanogasterDrosophilaMitochondriaOXPHOSbiochemistrychemical biologysupercomplexes

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Hybrid Clear/Blue Native Electrophoresis for the Separation and Analysis of Mitochondrial Respiratory Chain Supercomplexes
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Area of Science:

  • Mitochondrial biology
  • Cellular respiration
  • Biochemistry

Background:

  • Mammalian mitochondrial respiratory chain (MRC) complexes form supercomplexes (SCs), but their functional significance and catalytic advantages remain debated.
  • Mitochondrial organization differs across species; *Drosophila melanogaster* exhibits low SCs despite high metabolic demand.

Purpose of the Study:

  • To investigate the role of SC formation in *Drosophila melanogaster* mitochondria.
  • To determine if SCs confer catalytic advantages in fruit fly mitochondria under varying biogenesis conditions.

Main Methods:

  • Attenuating the biogenesis of individual MRC complexes in *Drosophila melanogaster*.
  • Analyzing the formation of stable SCs and MRC activity.

Main Results:

  • Reduced biogenesis of individual MRC complexes led to increased stable SC formation in *Drosophila melanogaster*.
  • This SC formation did not correlate with increased mitochondrial respiratory activity.

Conclusions:

  • SC formation in *Drosophila melanogaster* appears necessary for complex stabilization under suboptimal biogenesis conditions.
  • SCs do not enhance respiratory chain catalysis in fruit fly mitochondria.