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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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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 the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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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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Enzymes are proteins made of amino acids. The functional group of each constituent amino acid catalyzes a wide variety of chemical reactions via ionic interactions or acid-base reactions. However, amino acids cannot catalyze oxidation-reduction and group transfer reactions and need to be aided by non-protein components called cofactors. Cofactors are also referred to as the chemical teeth of an enzyme.
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Related Experiment Video

Updated: Apr 4, 2026

Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools
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Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools

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The Q, Compound Q is Finally Deciphered.

Ambika Bhagi-Damodaran1, Yi Lu1

  • 1Department of Chemistry, University of Illinois, Urbana-Champaign, Urbana, Illinois 61801, United States.

Inorganic Chemistry Frontiers
|September 9, 2015
PubMed
Summary

Researchers identified the structure of a key intermediate, compound Q, in methane monooxygenases (MMOs) enzyme reactions. This breakthrough offers new insights into how these enzymes convert methane to methanol.

Area of Science:

  • Biochemistry
  • Enzymology
  • Chemical Catalysis

Background:

  • Methane monooxygenases (MMOs) are crucial enzymes that activate methane's C-H bond.
  • Understanding MMO mechanisms is vital for methane conversion and carbon management.
  • The structure of a key intermediate, compound Q, has been a long-standing mystery.

Purpose of the Study:

  • To determine the core structure of the enigmatic compound Q intermediate.
  • To elucidate the formation, reactivity, and decay pathways of compound Q.
  • To advance the understanding of soluble methane monooxygenase (sMMO) mechanisms.

Main Methods:

  • Spectroscopic analysis of reaction intermediates.
  • Advanced structural elucidation techniques.
  • Kinetic studies of MMO catalytic cycles.

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Assessment of Open Probability of the Mitochondrial Permeability Transition Pore in the Setting of Coenzyme Q Excess
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Main Results:

  • The core structure of compound Q has been firmly established.
  • Insights into compound Q's formation from substrate and enzyme.
  • Characterization of compound Q's reaction with methane and its subsequent decay.

Conclusions:

  • The established structure of compound Q provides a critical piece in the MMO puzzle.
  • This work significantly enhances our understanding of MMO catalytic mechanisms.
  • Future research can build upon these findings for enzyme engineering and methane utilization.