Cytochrome C Oxidase
Cytochrome C Oxidase - Related Videos
06:53
Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry
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Cited by 82 •
2011
The cytochrome c oxidase/sodium dehydrogenase (COX/SDH) double-labeling method allows for direct visualization of mitochondrial respiratory enzyme deficiencies in fresh-frozen tissue sections. This is a straightforward histochemical technique and is useful in investigating mitochondrial diseases, aging, and aging-related disorders.
07:42
Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c
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Cited by 15 •
2011
In this protocol, we describe the direct cytoplasmic microinjection of cytochrome c protein into fibroblasts and primary sympathetic neurons. This technique allows for the introduction of cytochrome c protein into the cytoplasm of cells and mimics the release of cytochrome c from mitochondria, which occurs during apoptosis.
10:42
Bioluminescence Imaging of NADPH Oxidase Activity in Different Animal Models
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Cited by 16 •
2012
NADPH oxidase is the major source of reactive oxygen species (ROS) in phagocytes. Because of the ephemeral nature of ROS, it is difficult to measure and monitor ROS levels in living animals. A minimally invasive method for serial quantification of ROS in living mice is described.
11:06
Encapsulating Cytochrome c in Silica Aerogel Nanoarchitectures without Metal Nanoparticles while Retaining Gas-phase Bioactivity
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Cited by 1 •
2016
This procedure describes how to encapsulate cytochrome c (cyt. c) in silica (SiO2) sol-gels, process these gels to form bioaerogels, and use these bioaerogels to rapidly recognize nitric oxide (NO) through a gas-phase reaction. This type of protocol may aid in the future development of biosensors or other bioanalytical devices.
01:28
Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes
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2026
Cytochrome P450 (CYP450) enzymes are a superfamily of heme-containing monooxygenases that play a pivotal role in Phase I drug metabolism by catalyzing oxidation and reduction reactions.These enzymes transform lipophilic xenobiotics into more hydrophilic metabolites, facilitating subsequent Phase II conjugation and eventual excretion. The CYP450 family is classified into families (e.g., CYP1–CYP3) and subfamilies (e.g., CYP2A, CYP2C), based on amino acid sequence homology.CYP450 isoenzymes,...
FAQs
The complex receives electrons from cytochrome c and passes them to molecular oxygen. Energy released during this transfer supports the movement of protons across the membrane rather than being lost as heat alone. This coupling links oxidation-reduction reactions to the formation of a proton gradient, creating the central connection between electron transport and ATP production.
Molecular oxygen serves as the electron acceptor at the end of the electron transport chain. Cytochrome c oxidase transfers electrons to oxygen and reduces it to water, allowing electron flow to continue through the pathway. Without this terminal reaction, the chain could not maintain the energy conversion process that supports aerobic cellular metabolism.
Proton pumping creates a difference in proton concentration across the membrane. ATP synthase can use this stored gradient to drive ATP formation, converting the energy captured during electron transfer into a form cells can use. Consequently, cytochrome c oxidase contributes indirectly to ATP production by establishing the electrochemical conditions required for oxidative phosphorylation.
Examining its activity helps researchers assess how mitochondria use oxygen and convert energy during aerobic metabolism. Because the complex connects electron transport with proton-gradient formation, its behavior provides information about the efficiency of oxidative phosphorylation. This makes it a useful focus for understanding normal mitochondrial bioenergetics and the consequences of impaired energy conversion.
The complex occurs in mitochondria and in many bacteria, linking these organisms through a shared role in aerobic energy production. Studying it across these biological systems can clarify how membrane-based electron transport supports metabolism and can contribute to research on the evolution of energy-converting processes.
Changes in cytochrome c oxidase activity can provide clues about impaired oxidative phosphorylation and disrupted cellular energy production. Researchers can use this relationship to connect defects in mitochondrial function with disease-associated bioenergetic problems. Such studies also help distinguish the roles of oxygen utilization, electron transport, and ATP-supporting mechanisms in cellular dysfunction.