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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...
Redox Reactions01:24

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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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EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1
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Published on: November 26, 2014

Cambios estructurales ligados al redox en la ribonucleótido reductasa.

A R Offenbacher1, I R Vassiliev, M R Seyedsayamdost

  • 1Department of Chemistry and Biochemistry and the Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.

Journal of the American Chemical Society
|June 4, 2009
PubMed
Resumen
Este resumen es generado por máquina.

La ribonucleótido reductasa (RNR) utiliza un radical tirosílico (Y122*) para iniciar la catálisis. Este estudio revela cambios estructurales ligados al redox en los enlaces de amida cercanos, impulsados por cambios electrostáticos en el radical.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Molecular Biología Molecular
  • La espectroscopia es una técnica de espectroscopia.

Sus antecedentes:

  • La ribonucleótido reductasa (RNR) es esencial para la síntesis del ADN, catalizando la producción de desoxirribonucleótidos.
  • Las RNR de clase I, como la subunidad beta2 de E. coli, presentan centros de hierro y un radical libre tirosilo crítico (Y122*) para la catálisis.
  • Los cambios conformacionales dependientes de redox en Y122* pueden regular la transferencia de electrones acoplados a protones.

Objetivo del estudio:

  • Investigar cambios estructurales ligados al redox asociados con el radical Y122* en E. coli beta2.
  • Comprender el papel del radical tirosilo en el inicio de las reacciones catalíticas.
  • Para explorar el mecanismo de regulación de la transferencia de electrones acoplados a protones.

Principales métodos:

  • Se utilizó la espectroscopia infrarroja de la Transformación de Fourier (FT-IR) para detectar cambios espectrales inducidos por la reacción.
  • El etiquetado isotópico con (2)H(4) tirosina y (15)N tirosina ayudó en las asignaciones espectrales.
  • Los espectros de diferencia se obtuvieron durante la reducción de Y122* por hidroxiurea.

Principales resultados:

  • El análisis de FT-IR identificó bandas vibratorias específicas relacionadas con Y122 (1514 cm(-1)) y Y122* (1498 cm(-1)).
  • Los espectros inducidos por la reacción mostraron cambios en las bandas de amida I (1661 y 1652 cm(-1)), lo que indica alteraciones estructurales.
  • Estos desplazamientos de la banda de amida reflejaron los observados en un modelo de pentapeptido, lo que sugiere efectos mediados por secuencia.

Conclusiones:

  • La reducción de Y122* está acoplada a perturbaciones estructurales de los enlaces amídicos cercanos.
  • Estos cambios estructurales están influenciados por la secuencia de aminoácidos que rodea al radical tirosilo.
  • Un mecanismo propuesto implica cambios electrostáticos ligados al redox dentro del anillo aromático del radical tirosílico que conduce a perturbaciones de enlaces amídicos.