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Related Concept Videos

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...
The Electron Transport Chain01:30

The Electron Transport Chain

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
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q in...
ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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 ATP...
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,...
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,...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...

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Related Experiment Video

Updated: May 22, 2026

Experimental Protocol for Detecting Mitochondrial Function in Hepatocytes Exposed to Organochlorine Pesticides
08:39

Experimental Protocol for Detecting Mitochondrial Function in Hepatocytes Exposed to Organochlorine Pesticides

Published on: September 16, 2020

Simplified bicyclic pyridinol analogues protect mitochondrial function.

Xiaoqing Cai1, Omar M Khdour, Jennifer Jaruvangsanti

  • 1Center for BioEnergetics, Biodesign Institute, and Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287, United States.

Bioorganic & Medicinal Chemistry
|May 8, 2012
PubMed
Summary

Researchers developed simpler, potent bicyclic pyridinol antioxidants. These novel compounds retain biological activity and protect against oxidative stress, offering accessible alternatives for preserving mitochondrial function.

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Last Updated: May 22, 2026

Experimental Protocol for Detecting Mitochondrial Function in Hepatocytes Exposed to Organochlorine Pesticides
08:39

Experimental Protocol for Detecting Mitochondrial Function in Hepatocytes Exposed to Organochlorine Pesticides

Published on: September 16, 2020

Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs
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Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs

Published on: August 15, 2025

Area of Science:

  • Organic Chemistry
  • Biochemistry
  • Pharmacology

Background:

  • Bicyclic pyridinol antioxidants show superior efficacy over α-tocopherol in suppressing methyl linoleate autoxidation.
  • Novel lipophilic analogues with potent antioxidant activity were synthesized but faced development challenges due to complex synthetic routes.

Purpose of the Study:

  • To develop a facile synthetic approach for simplified bicyclic pyridinol analogues.
  • To evaluate the antioxidant activity and protective effects of these novel analogues under oxidative stress.

Main Methods:

  • A five-step synthetic route was employed to create simplified analogues (1a-1c) and their acetate ester precursors (2a-2c).
  • Regioselective metalation was used to attach alkyl chains of varying lengths to the antioxidant core.

Main Results:

  • The synthesized analogues retained significant biological activity.
  • The compounds demonstrated protective effects against induced oxidative stress, indicating potential for preserving mitochondrial function.

Conclusions:

  • A facile synthetic strategy provides readily accessible bicyclic pyridinol analogues with potent antioxidant properties.
  • These simplified analogues represent promising candidates for developing new antioxidants, particularly for maintaining mitochondrial health.