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Una tiol peroxidasa es un receptor de H2O2 y redóxido-transductor en la activación de genes
Agnès Delaunay1, Delphine Pflieger, Marie Bénédicte Barrault
1Laboratoire Stress Oxydants et Cancers, SBGM, DBJC, CEA-Saclay, 91191 Gif-sur-Yvette, Cedex, France.
Cell
|November 20, 2002
Resumen
La enzima parecida a la glutatión peroxidasa Gpx3 actúa como un sensor de hidroperoxido, transmitiendo la señal al factor de transcripción Yap1 para regular las respuestas celulares. Esto revela un nuevo mecanismo de detección de hidroperoxido eucariota que involucra a Gpx3 y Yap1.1.
Área de la Ciencia:
- * Biología Celular.
- * La bioquímica es la bioquímica.
- * Biología Molecular.
Sus antecedentes:
- * El factor de transcripción Yap1 es crucial para mantener la homeostasis del hidroperoxido en Saccharomyces cerevisiae.
- * La activación de Yap1 se desencadena por el aumento de los niveles celulares de hidroperoxido, pero el mecanismo de oxidación directa no estaba claro.
Objetivo del estudio:
- * Para dilucidar el mecanismo por el cual los hidroperoxidos activan el factor de transcripción Yap1.
- * Para identificar el sensor y el transductor de la señal de hidroperoxido a Yap1.1.
Principales métodos:
- * Investigó la interacción entre los hidroperoxidos, Gpx3 y Yap1 en S. cerevisiae.
- * Utilizamos ensayos bioquímicos para analizar la formación y resolución de enlaces disulfuro.
- * Se examinó el papel de la tioredoxina en la regulación de la vía.
Principales resultados:
- * Yap1 no se oxida directamente por los hidroperoxidos.
- * La enzima Gpx3 parecida a la glutatión peroxidasa (GPx) funciona como el sensor de hidroperoxido.
- * Gpx3 forma un enlace disulfuro intermolecular con Yap1, que se resuelve en un enlace intramolecular en Yap1, lo que significa activación.
- * La tioredoxina desactiva la vía reduciendo tanto Gpx3 como Yap1.1.
Conclusiones:
- * Gpx3 actúa como receptor de hidroperoxido y transductor redox, mediando la transmisión de la señal a Yap1.1.
- * Este estudio revela un nuevo mecanismo eucariótico para detectar y responder a los hidroperoxidos.
- * Los hallazgos destacan un papel de señalización redox para las enzimas similares a GPx en la regulación celular.
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