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Related Concept Videos

Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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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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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 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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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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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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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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Mitochondrial Reverse Electron Transport: Mechanisms, Pathophysiological Roles, and Therapeutic Potential.

Yanyu Bao1,2,3,4, Cuilan Hu1,2,3,4, Bing Wang5

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Mitochondrial reverse electron transport (RET) is a cellular process that can generate energy but also cause damage. Understanding RET

Keywords:
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Area of Science:

  • Cellular Metabolism
  • Mitochondrial Biology
  • Biochemistry

Background:

  • Mitochondrial reverse electron transport (RET) is a complex metabolic pathway.
  • RET involves electron flow from reduced coenzyme Q (CoQH2) to complex I.
  • Dysregulated RET contributes to oxidative stress and cellular damage.

Purpose of the Study:

  • To systematically review the mechanisms of RET.
  • To examine the pathophysiological consequences of RET.
  • To explore the role of RET in various diseases.

Main Methods:

  • Systematic literature review.
  • Analysis of biochemical pathways.
  • Pathophysiological correlation.

Main Results:

  • RET generates superoxide, contributing to redox signaling but also oxidative damage.
  • RET has a dual role: ATP generation and mitochondrial dysfunction.
  • RET is implicated in ischemia-reperfusion injury, neurodegeneration, and cancer.

Conclusions:

  • RET is a critical metabolic regulator with broad disease implications.
  • Targeting RET may offer therapeutic strategies for diseases.
  • Further research needed on RET modulators and activation thresholds.