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NPAS2: un factor de transcripción sensible al gas.

Elhadji M Dioum1, Jared Rutter, Jason R Tuckerman

  • 1Departments of Biochemistry and Plant Biology and Plant Biotechnology Center, The Ohio State University, 1060 Carmack Road, Columbus, OH 43210, USA.

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|November 26, 2002
PubMed
Resumen

La proteína 2 del dominio PAS neuronal (NPAS2) se une al hemo, una molécula que regula su unión al ADN. El monóxido de carbono interrumpe los heterodímeros NPAS2-BMAL1, lo que afecta la expresión génica del ritmo circadiano.

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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • Cronobiología cronobiología.
  • La bioquímica es la bioquímica.

Sus antecedentes:

  • La proteína 2 del dominio PAS neuronal (NPAS2) es un factor de transcripción crucial para la regulación del ritmo circadiano.
  • NPAS2 funciona como un heterodímero con BMAL1, que se une al ADN para controlar la expresión génica.

Objetivo del estudio:

  • Para investigar el papel del hemo en la función NPAS2.
  • Aclarar el mecanismo por el cual el estado hemo y las moléculas gaseosas afectan la unión al ADN de NPAS2-BMAL1 y la regulación circadiana.

Principales métodos:

  • Los ensayos de unión al ADN in vitro se realizaron utilizando heterodímeros NPAS2-BMAL1 en estados apo (libre de hemo) y holo (cargado de hemo).
  • Se evaluó el efecto de las diferentes proporciones de NADP (H) y monóxido de carbono (CO) en la unión al ADN.

Principales resultados:

  • Ambos dominios PAS de NPAS2 se unen al hemo, que modula la actividad de unión al ADN.
  • Los heterodímeros NPAS2-BMAL1 cargados de hemo mostraron una unión ávida al ADN bajo condiciones de reducción específicas.
  • El monóxido de carbono inhibió la unión del ADN holo-NPAS2 y promovió la formación de homodímero BMAL1, interrumpiendo los heterodímeros NPAS2-BMAL1.

Conclusiones:

  • El hemo actúa como un grupo prostético en NPAS2, detectando e integrando las señales redox y gaseosas celulares.
  • La heterodimerización NPAS2-BMAL1 y la subsiguiente regulación génica están controladas por la detección de gases basada en el hemo, proporcionando un nuevo mecanismo de regulación para el ritmo circadiano.