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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Management of Insomnia

The sleep cycle, an integral part of human health, consists of several stages with distinct characteristics and functions. It begins with a transition from wakefulness to sleep, known as the light sleep phase, followed by the restorative deep sleep phase, essential for physical recovery and growth. The cycle concludes with the Rapid Eye Movement (REM) phase, characterized by high brain activity and vivid dreaming. Insomnia, a prevalent sleep disorder, involves difficulty falling asleep, staying...
Redox Reactions01:27

Redox Reactions

Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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: May 28, 2026

Optimized Automated Analysis of Live Neuronal Mitochondria Homeostasis Modulation by Isoform-Specific Retinoic Acid Receptors
08:33

Optimized Automated Analysis of Live Neuronal Mitochondria Homeostasis Modulation by Isoform-Specific Retinoic Acid Receptors

Published on: July 28, 2023

Melatonin Targets Mitochondrial Redox Homeostasis: Optimizing the Intracellular Microenvironment.

Russel J Reiter1, Ramaswamy Sharma2, Doris Loh3

  • 1Department of Cell Systems and Anatomy, UT Health San Antonio Long School of Medicine, San Antonio, TX 78229, USA.

International Journal of Molecular Sciences
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

Melatonin is a potent antioxidant synthesized in mitochondria, protecting against oxidative stress and potentially mitigating disease. Its role in regulating cellular functions like membrane fluidity is also highlighted.

Keywords:
antioxidantbiomolecular condensatesdamage radiuselectron transport chainlipid raftsliquid–liquid phase separationmelatonin inducibilitymelatonin metabolitesoxidative stressreactive oxygen species

Related Experiment Videos

Last Updated: May 28, 2026

Optimized Automated Analysis of Live Neuronal Mitochondria Homeostasis Modulation by Isoform-Specific Retinoic Acid Receptors
08:33

Optimized Automated Analysis of Live Neuronal Mitochondria Homeostasis Modulation by Isoform-Specific Retinoic Acid Receptors

Published on: July 28, 2023

Area of Science:

  • Biochemistry
  • Cell Biology
  • Mitochondrial Research

Background:

  • Melatonin is recognized as a free radical scavenger.
  • Its synthesis and function within the mitochondrial matrix are under investigation.
  • Mitochondria are key sites of reactive oxygen species production.

Purpose of the Study:

  • To analyze experimental evidence for melatonin's radical scavenging actions in vivo.
  • To assess data supporting melatonin synthesis within the mitochondrial matrix.
  • To explore novel functions of melatonin in cellular regulation.

Main Methods:

  • Systematic analysis of experimental approaches.
  • Assessment of data on melatonin production in isolated mitochondria.
  • Review of studies on melatonin's effects on membrane fluidity and biomolecular condensates.

Main Results:

  • Melatonin concentrations are higher in mitochondria than other cellular compartments.
  • Enzymes for melatonin synthesis are present in the mitochondrial matrix.
  • Mitochondria can synthesize melatonin, positioning it near reactive oxygen species.

Conclusions:

  • Melatonin is optimally positioned to act as an antioxidant within mitochondria.
  • It may play a crucial role in maintaining mitochondrial redox homeostasis.
  • Further validation could establish melatonin as a key factor in disease mitigation.