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Related Concept Videos

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...
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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Protein Complex Assembly02:41

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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.
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Electron Transport Chain: Complex III and IV01:43

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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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Updated: May 10, 2026

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

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Published on: May 3, 2024

Respiratory supercomplexes: structure, function and assembly.

Rasika Vartak1, Christina Ann-Marie Porras, Yidong Bai

  • 1Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX, 78229, USA.

Protein & Cell
|July 6, 2013
PubMed
Summary
This summary is machine-generated.

Mitochondrial supercomplexes, not individual enzymes, form the respiratory chain for ATP generation. Understanding their assembly is crucial for addressing genetic and neurodegenerative disorders.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • The mitochondrial respiratory chain generates ATP via five enzyme complexes.
  • The established model of discrete enzymes has shifted to the supercomplex model, where complexes associate.
  • Mitochondrial supercomplexes are vital for stable respiratory complexes and cellular energy production.

Purpose of the Study:

  • To review the functional and structural importance of mitochondrial supercomplexes.
  • To provide a comprehensive overview of supercomplex assembly.
  • To discuss known assembly factors involved in supercomplex formation.

Main Methods:

  • This is a review article, synthesizing existing research.
  • Literature search on mitochondrial respiratory chain supercomplexes.
  • Analysis of studies on supercomplex assembly and function.

Main Results:

  • Mitochondrial supercomplexes are functionally active and essential for respiratory complex stability.
  • Defects in supercomplexes are linked to genetic and neurodegenerative diseases.
  • Assembly factors play a critical role in the formation of these supramolecular structures.

Conclusions:

  • Mitochondrial supercomplexes represent a significant paradigm shift in understanding cellular respiration.
  • Further research into supercomplex assembly factors may reveal therapeutic targets for associated disorders.
  • The structural and functional integrity of supercomplexes is fundamental to mitochondrial health.