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Related Concept Videos

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...
Redox Reactions01:24

Redox Reactions

Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Electron Transport Chain: Complex III and IV

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...
Role of Reduced Coenzymes NADH and FADH₂01:29

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The energy released from the breakdown of the chemical bonds within nutrients can be stored either through the reduction of electron carriers or in the bonds of adenosine triphosphate (ATP). In living systems, a small class of compounds functions as mobile electron carriers, molecules that bind to and shuttle high-energy electrons between compounds in pathways. The principal electron carriers that will be considered originate from the B vitamin group and are derivatives of nucleotides; they are...
Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
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...

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Putidaredoxin-to-cytochrome P450cam electron transfer: differences between the two reductive steps required for

Vadim Yu Kuznetsov1, Thomas L Poulos, Irina F Sevrioukova

  • 1Department of Molecular Biology and Biochemistry, University of California, Irvine, California 92697-3900, USA.

Biochemistry
|September 28, 2006
PubMed
Summary

Electron transfer between putidaredoxin (Pdx) and Cytochrome P450cam involves distinct pathways. Key residues Asp38 and Trp106 in Pdx are crucial for specific interactions and electron transfer efficiency in the camphor-hydroxylation system.

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Area of Science:

  • Biochemistry
  • Protein-protein interactions
  • Electron transfer mechanisms

Background:

  • Cytochrome P450cam (P450cam) is a key enzyme in camphor metabolism.
  • Two electron transfer (ET) steps from putidaredoxin (Pdx) to P450cam are essential for its function.
  • The precise mechanisms of these ET steps and Pdx's role remain incompletely understood.

Purpose of the Study:

  • To elucidate the differences in protein-protein interactions and electron transfer pathways between Pdx and different redox states of P450cam.
  • To identify key residues in Pdx responsible for mediating these interactions and electron transfer events.

Main Methods:

  • Site-directed mutagenesis of Pdx (Asp38 and Trp106 variants).
  • Kinetic analyses of electron transfer rates and binding affinities.
  • Computational modeling of Pdx-P450cam complexes.

Main Results:

  • Mutations in Pdx (D38A, W106A, delta106) significantly altered binding to ferric P450cam and reduced first ET ability.
  • Mutant Pdx binding to dioxygen-bound P450cam was unaffected, but second ET rates dropped drastically (<1%).
  • Distinct interacting residues and ET pathways were identified for ferric and dioxygen-bound P450cam complexes.

Conclusions:

  • P450cam-Pdx interaction specificity is redox-state dependent for both proteins.
  • Alternative ET routes exist for ferric P450cam, while a unique Asp38-dependent pathway is critical for dioxygen-bound P450cam.
  • Pdx Trp106 plays a structural role, potentially facilitating the second ET and product formation through heme-binding loop interactions.