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Related Concept Videos

Electron Transport Chain Components01:29

Electron Transport Chain Components

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The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
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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
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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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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.
ROS generation is regulated and maintained at moderate levels necessary...
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Chemiosmosis and ATP Synthesis01:22

Chemiosmosis and ATP Synthesis

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The electron transport chain is a critical component of cellular respiration, occurring in the inner mitochondrial membrane. It facilitates the transfer of high-energy electrons from reduced cofactors NADH and FADH₂ to molecular oxygen, the final electron acceptor. This transfer of electrons through a series of protein complexes is tightly coupled to the translocation of protons across the membrane, generating a proton gradient essential for ATP synthesis.Electron Flow and Proton...
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Melatonin and the electron transport chain.

Rüdiger Hardeland1

  • 1Johann Friedrich Blumenbach, Institute of Zoology and Anthropology, University of Göttingen, Bürgerstr. 50, 37073, Göttingen, Germany. rhardel@gwdg.de.

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Melatonin safeguards the mitochondrial electron transport chain by reducing harmful reactive nitrogen species and enhancing antioxidant defenses. It also inhibits mitochondrial permeability transition pore opening, preserving mitochondrial function.

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Area of Science:

  • Mitochondrial biochemistry
  • Neuroendocrinology
  • Cellular redox homeostasis

Background:

  • The electron transport chain (ETC) is crucial for cellular energy production but vulnerable to oxidative damage.
  • Reactive nitrogen species, such as nitric oxide (NO) and peroxynitrite, can impair ETC function.
  • Mitochondrial dysfunction is implicated in aging and various pathologies.

Purpose of the Study:

  • To elucidate the multifaceted protective mechanisms of melatonin on the mitochondrial electron transport chain.
  • To investigate melatonin's role in mitigating oxidative stress within mitochondria.
  • To explore melatonin's influence on mitochondrial integrity and function.

Main Methods:

  • Analysis of melatonin's effects on nitric oxide synthases (iNOS, nNOS) and reactive nitrogen species levels.
  • Assessment of melatonin's impact on intramitochondrial antioxidant systems, including glutathione and SOD enzymes.
  • Investigation of melatonin's role in inhibiting cardiolipin peroxidation and mitochondrial permeability transition pore opening.

Main Results:

  • Melatonin downregulates iNOS and nNOS, reducing peroxynitrite formation and subsequent ETC damage.
  • Melatonin enhances key antioxidant enzymes (glutathione peroxidase, Mn-SOD, Cu,Zn-SOD) and glutathione levels.
  • Melatonin inhibits cardiolipin peroxidation and the opening of the mitochondrial permeability transition pore.

Conclusions:

  • Melatonin provides comprehensive protection to the mitochondrial ETC through antioxidant and anti-peroxidation pathways.
  • Melatonin's actions help maintain mitochondrial structural integrity and prevent dysfunction associated with aging and stress.
  • The findings highlight melatonin as a potential therapeutic agent for conditions involving mitochondrial dysfunction.