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Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure to...
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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme nitrate reductase...
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El ensamblaje hemo/cobre mediado por la interconversión de nitrito y óxido nítrico.

Shabnam Hematian1, Maxime A Siegler, Kenneth D Karlin

  • 1Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, USA.

Journal of the American Chemical Society
|November 8, 2012
PubMed
Resumen

La citocromo c oxidasa también es un citócromo.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • La cinética de las enzimas.
  • Química de las redox.

Sus antecedentes:

  • El sitio activo del hemo (a3) / Cu (b) de la citocromo c oxidasa media la reducción de nitrito celular al óxido nítrico.
  • Este sitio activo también oxida el óxido nítrico de nuevo a nitrito.

Objetivo del estudio:

  • Investigar las funciones específicas de los iones hemo y Cu (II) en las reacciones redox que involucran nitrito y óxido nítrico en el sitio activo hemo (a3) / Cu (B).

Principales métodos:

  • Análisis espectroscópico de un conjunto hemo/Cu parcialmente reducido.
  • Monitoreo de los productos de reacción en condiciones controladas.

Principales resultados:

  • Se demostró que un conjunto hemo/Cu parcialmente reducido reduce los iones nitrito a óxido nítrico, lo que requiere tanto hemo como Cu (II).
  • Se identificó que un complejo μ-oxo heme-Fe (III) -O-Cu (II) facilita la oxidación del óxido nítrico a nitrito.

Conclusiones:

  • El sitio activo hemo (a3) / Cu (b) exhibe una química redox bidireccional con óxidos de nitrógeno.
  • Esta doble capacidad destaca el papel crucial del sitio en la regulación del metabolismo del óxido nítrico.