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El coactivador-1 del receptor de esteroides es una histona acetiltransferasa
T E Spencer1, G Jenster, M M Burcin
1Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77030, USA.
Nature
|September 20, 1997
Resumen
El coactivador del receptor de esteroides SRC-1 tiene actividad de la histona acetiltransferasa, ayudando a la transcripción génica. Esta actividad, junto con PCAF, ayuda a superar la represión de la cromatina, permitiendo la activación de genes.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La epigenética es la epigenética.
- Reglamento genético Reglamento genético.
Sus antecedentes:
- Los receptores de esteroides y los coactivadores suelen mejorar la expresión génica mediante la formación de complejos de transcripción.
- El acceso a la cromatina reprimida sigue siendo una cuestión clave para comprender la activación génica in vivo.
- Se sabe que las histonas acetiltransferasas (HAT) contrarrestan los efectos inhibidores de la cromatina en la transcripción.
Objetivo del estudio:
- Para investigar el papel del coactivador del receptor de esteroides SRC-1 en la modulación de la cromatina.
- Para determinar si SRC-1 posee actividad intrínseca de la histona acetiltransferasa (HAT).
- Para explorar la interacción entre SRC-1, PCAF y la acetilación de histonas en la transcripción génica.
Principales métodos:
- Análisis bioquímicos para evaluar la actividad HAT de SRC-1.
- Estudios de interacción de proteínas para examinar la unión de SRC-1 y PCAF.
- Análisis de los patrones de acetilación de histonas en promotores de genes específicos.
Principales resultados:
- SRC-1 exhibe actividad HAT intrínseca, dirigida principalmente a las histonas H3 y H4.
- SRC-1 interactúa con otro HAT, el factor p300/CBP-asociado (PCAF).
- La unión de ligandos a los receptores de esteroides puede desencadenar la acetilación de histonas mediada por SRC-1 y PCAF.
Conclusiones:
- La actividad HAT de SRC-1 es crucial para superar la represión de la cromatina.
- La acción coordinada de SRC-1 y PCAF facilita el acceso del factor de transcripción a la cromatina reprimida.
- Este mecanismo mejora la activación génica mediada por el receptor de esteroides y aumenta la transcripción génica específica.
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