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Oxidación del sulfuro de hidrógeno por la mioglobina

Trever Bostelaar, Victor Vitvitsky, Jacques Kumutima

  • 1Department of Pharmaceutical Science, Wayne State University , Detroit, Michigan 48201-2417, United States.

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La mioglobina, al igual que la hemoglobina, puede oxidar el sulfuro de hidrógeno tóxico (H2S) en sustancias menos dañinas. Este hallazgo puede explicar por qué los músculos esqueléticos son vulnerables al envenenamiento por H2S en ciertos trastornos metabólicos.

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Área de la Ciencia:

  • La bioquímica
  • Biología molecular
  • Toxicología

Sus antecedentes:

  • El sulfuro de hidrógeno (H2S) es una molécula de señalización producida a partir de aminoácidos, pero tóxica en altas concentraciones.
  • Las células poseen mecanismos para desintoxicar el H2S, principalmente a través de la oxidación del sulfuro mitocondrial.
  • Anteriormente se descubrió que la hemoglobina férrica oxida el H2S, lo que sugiere que otras proteínas hemo podrían compartir esta función.

Objetivo del estudio:

  • Investigar la capacidad de la mioglobina para oxidar el sulfuro de hidrógeno (H2S).
  • Caracterizar los intermediarios de azufre unidos al hierro formados durante la oxidación de H2S por la mioglobina.
  • Explorar el papel potencial de la mioglobina en la desintoxicación de H2S y su relevancia para enfermedades específicas.

Principales métodos:

  • Se utilizó espectrometría de crio-masa y espectroscopia de absorción de rayos X para atrapar y analizar los intermedios de azufre.
  • La resonancia paramagnética de electrones (EPR) y la espectroscopia Raman de resonancia proporcionaron evidencia adicional para los intermediarios de reacción.
  • Se emplearon cálculos de la teoría funcional de la densidad (DFT) para apoyar las hipótesis mecanicistas.

Principales resultados:

  • Se confirmó que la mioglobina oxida el sulfuro de hidrógeno (H2S) a tiosulfato y otros productos de azufre.
  • Los intermediarios de azufre unidos al hierro, incluidos los hidropolisulfuros, fueron atrapados y caracterizados con éxito.
  • Los datos espectroscópicos y computacionales proporcionaron un fuerte apoyo para la vía de oxidación propuesta.

Conclusiones:

  • La mioglobina juega un papel importante en la oxidación del sulfuro de hidrógeno (H2S), similar a la hemoglobina.
  • La caracterización de los intermediarios de azufre aclara el mecanismo de desintoxicación de H2S por la mioglobina.
  • La mioglobina puede concentrar H2S en el músculo esquelético, lo que podría explicar su sensibilidad al envenenamiento por sulfuro en la encefalopatía etilmalónica.