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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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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
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Oxidation and Reduction of Organic Molecules01:19

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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.
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Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions. 
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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...
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The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
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Acoplamiento de energía redox reversible en cadenas de transferencia de electrones.

Artur Osyczka1, Christopher C Moser, Fevzi Daldal

  • 1The Johnson Research Foundation, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, USA.

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Este estudio revela la reversibilidad de milisegundos en el acoplamiento de energía del citocromo bc1, desafiando los modelos existentes. Dos mecanismos, el cerramiento conformacional o la química concertada de dos electrones, evitan los cortocircuitos en este proceso vital.

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Área de la Ciencia:

  • Bioquímica y Biofísica.
  • La bioenergética es la bioenergética.
  • Sistemas de transferencia de electrones Sistemas de transferencia de electrones.

Sus antecedentes:

  • La reversibilidad es crucial en la transducción de energía biológica, particularmente en los sistemas respiratorio y fotosintético.
  • El complejo del citocromo bc1 es fundamental para el acoplamiento de energía, catalizando la transferencia de electrones entre la quinona y el citocromo c.
  • Comprender los mecanismos de acoplamiento de energía eficiente y reversible es esencial para comprender la producción de energía celular.

Objetivo del estudio:

  • Para investigar la reversibilidad de los cofactores individuales dentro del complejo del citocromo bc1.
  • Aclarar los mecanismos que permiten un acoplamiento de energía eficiente y reversible en una escala de tiempo catalítica.
  • Desafiar y refinar los modelos existentes de catálisis de quinona en el sitio de Q (((o).

Principales métodos:

  • La inactivación progresiva de los cofactores individuales dentro del complejo del citocromo bc1.
  • Resolución de la reversibilidad a escala de tiempo de milisegundos en el túnel de electrones y el intercambio de protones.
  • Análisis de la catálisis hidroquinona-quinona de separación de cargas en el sitio Q ((o).

Principales resultados:

  • La reversibilidad de milisegundos se observó en todos los pasos de túnel de electrones e intercambios de protones acoplados.
  • La rápida reversibilidad en el sitio Q ((o) indica la relevancia de los equilibrios redox en una escala de tiempo catalítica.
  • Los modelos existentes basados en productos intermedios de semiquinona son desafiados debido a posibles fallas de cortocircuito.

Conclusiones:

  • Dos mecanismos distintos puertas conformacionales de semiquinona o química concertada de quinona de dos electrones posibilitan una función reversible.
  • Estos mecanismos evitan el cortocircuito relegándolo a un túnel de electrones más lento y de larga distancia (escala de tiempo de segundos).
  • Los hallazgos proporcionan información crítica sobre la naturaleza dinámica y reversible de la transducción de energía biológica.