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Q cycle

Index Q cycle

The Q cycle (named for CoQ10) describes a series of reactions that describe how the sequential oxidation and reduction of the lipophilic electron carrier, Coenzyme Q10 (CoQ10), between the ubiquinol and ubiquinone forms, can result in the net movement of protons across a lipid bilayer (in the case of the mitochondria, the inner mitochondrial membrane). [1]

16 relations: Adenosine triphosphate, Coenzyme Q – cytochrome c reductase, Coenzyme Q10, Cytochrome b, Cytochrome c, Cytochrome c oxidase, Heme, Hydrogen bond, Lipid, Mitochondrion, Peter D. Mitchell, Propionate, Proton, Rieske protein, Semiquinone, Ubiquinol.

Adenosine triphosphate

Adenosine triphosphate (ATP) is a complex organic chemical that participates in many processes.

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Coenzyme Q – cytochrome c reductase

The coenzyme Q: cytochrome c – oxidoreductase, sometimes called the cytochrome bc1 complex, and at other times complex III, is the third complex in the electron transport chain, playing a critical role in biochemical generation of ATP (oxidative phosphorylation).

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Coenzyme Q10

Coenzyme Q10, also known as ubiquinone, ubidecarenone, coenzyme Q, and abbreviated at times to CoQ10, CoQ, or Q10 is a coenzyme that is ubiquitous in animals and most bacteria (hence the name ubiquinone).

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Cytochrome b

Cytochrome b is a protein found in the mitochondria of eukaryotic cells.

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Cytochrome c

The cytochrome complex, or cyt c is a small hemeprotein found loosely associated with the inner membrane of the mitochondrion.

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Cytochrome c oxidase

The enzyme cytochrome c oxidase or Complex IV, is a large transmembrane protein complex found in bacteria, archaea, and in eukaryotes in their mitochondria.

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Heme or haem is a coordination complex "consisting of an iron ion coordinated to a porphyrin acting as a tetradentate ligand, and to one or two axial ligands." The definition is loose, and many depictions omit the axial ligands.

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Hydrogen bond

A hydrogen bond is a partially electrostatic attraction between a hydrogen (H) which is bound to a more electronegative atom such as nitrogen (N), oxygen (O), or fluorine (F), and another adjacent atom bearing a lone pair of electrons.

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In biology and biochemistry, a lipid is a biomolecule that is soluble in nonpolar solvents.

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The mitochondrion (plural mitochondria) is a double-membrane-bound organelle found in most eukaryotic organisms.

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Peter D. Mitchell

Peter Dennis Mitchell, FRS (29 September 1920 – 10 April 1992) was a British biochemist who was awarded the 1978 Nobel Prize for Chemistry for his discovery of the chemiosmotic mechanism of ATP synthesis.

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The propionate, or propanoate ion, is C2H5COO− (the conjugate base of propionic acid).

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| magnetic_moment.

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Rieske protein

Rieske proteins are iron-sulfur protein (ISP) components of cytochrome ''bc''1 complexes and cytochrome b6f complexes and responsible for electron transfer in some biological systems.

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Semiquinone (or ubisemiquinone) is a free radical resulting from the removal of one hydrogen atom with its electron during the process of dehydrogenation of a hydroquinone, such as hydroquinone itself or catechol, to a quinone or alternatively the addition of a single H atom to a quinone.

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Ubiquinol is an electron-rich (reduced) form of coenzyme Q10.

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[1] https://en.wikipedia.org/wiki/Q_cycle

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