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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 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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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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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: Aug 19, 2025

Author Spotlight: Unveiling Oxidative Phosphorylation System Dynamics and Mitochondrial Roles in Health and Disease
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Mitochondrial Respiratory Chain Supercomplexes: From Structure to Function.

Shuting Guan1, Li Zhao1, Ruiyun Peng1

  • 1Beijing Institute of Radiation Medicine, Beijing 100850, China.

International Journal of Molecular Sciences
|November 26, 2022
PubMed
Summary
This summary is machine-generated.

Mitochondrial supercomplexes (SCs) enhance cellular energy production and reduce harmful reactive oxygen species (ROS). Their proper assembly is crucial for maintaining metabolic balance and preventing diseases like neurodegenerative disorders.

Keywords:
assemblycytochrome cmitochondriarespiratory chainsupercomplexes

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Mitochondrial Function

Background:

  • Mitochondrial oxidative phosphorylation is central to eukaryotic energy production.
  • The mitochondrial respiratory chain comprises enzyme complexes and electron carriers.
  • Mitochondrial enzyme complexes assemble into respiratory chain supercomplexes (SCs).

Purpose of the Study:

  • To review the structure, assembly, and functions of mitochondrial respiratory chain supercomplexes (SCs).
  • To explore the link between SCs and various diseases, particularly neurodegenerative disorders.

Main Methods:

  • Literature review of studies on mitochondrial supercomplexes.
  • Analysis of research on SC assembly, function, and disease association.

Main Results:

  • SCs improve electron transfer efficiency and reduce reactive oxygen species (ROS) production.
  • Impaired SC assembly is implicated in neurodegenerative diseases.
  • SCs are vital for efficient mitochondrial respiration and metabolic homeostasis.

Conclusions:

  • Mitochondrial supercomplexes play critical roles in cellular energy metabolism and disease prevention.
  • Understanding SCs is key to addressing metabolic and neurodegenerative diseases.