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Related Concept Videos

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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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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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The Electron Transport Chain01:30

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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.
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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.
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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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Hybrid Clear/Blue Native Electrophoresis for the Separation and Analysis of Mitochondrial Respiratory Chain Supercomplexes
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Respiratory complex III2 assembles complex I via toxic intermediate in mitochondrial disease.

Maria G Ayala-Hernandez1, Anetzy Bermudez Torales1, Hannah Camille Tan1

  • 1Department of Molecular and Cellular Biology, University of California, Davis, United States.

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|July 16, 2025
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Summary
This summary is machine-generated.

Mitochondrial complex I mutations cause disease. Toxic intermediate buildup, not just lower levels, drives disease, and chronic hypoxia offers a rescue mechanism.

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Area of Science:

  • Biochemistry
  • Mitochondrial Biology
  • Molecular Medicine

Background:

  • Mutations in mitochondrial complex I lead to severe metabolic disorders.
  • Leigh syndrome, a mitochondrial disease, results from NDUFS4 mutations.
  • Current treatments for complex I deficiencies are lacking, but chronic hypoxia shows promise in mouse models.

Purpose of the Study:

  • To elucidate the molecular mechanisms behind NDUFS4 mutant pathophysiology.
  • To understand how chronic hypoxia rescues function in complex I deficiencies.
  • To investigate the structural basis of complex I assembly and dysfunction.

Main Methods:

  • Isolation of respiratory supercomplexes from NDUFS4 mutant mice.
  • Structural analysis of complex I assembly intermediates.
  • Investigation of oxygen-dependent reverse electron transfer pathways.

Main Results:

  • Complex I assembly intermediates were identified bound to complex III2, supporting a cooperative assembly model.
  • An accumulated complex I intermediate is consistent with pathological reverse electron transfer.
  • Pathophysiology is linked to the accumulation of toxic intermediates, not solely reduced complex I levels.

Conclusions:

  • The accumulation of toxic intermediates is a key driver of mitochondrial complex I deficiency diseases.
  • Pathological reverse electron transfer contributes to NDUFS4 mutant pathophysiology.
  • Chronic hypoxia may offer a therapeutic strategy by mitigating toxic intermediate accumulation.