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WSTF regula la respuesta al daño del ADN H2A.X a través de una nueva actividad de la tirosina quinasa
Andrew Xiao1, Haitao Li, David Shechter
1Laboratory of Chromatin Biology, The Rockefeller University, New York, New York 10065, USA.
Nature
|December 19, 2008
Resumen
El factor de transcripción del síndrome de Williams-Beuren (WSTF) tiene una nueva actividad de la tirosina quinasa, fosforilando H2A.X para regular la respuesta al daño del ADN y la remodelación de la cromatina en las células eucariotas.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- Genética La genética.
Sus antecedentes:
- Las rupturas de doble cadena de ADN (DSB) representan amenazas significativas para la estabilidad genómica en las células eucariotas.
- La respuesta celular implica una reorganización de la cromatina marcada por la fosforilación H2A.X (gamma-H2A.X).
- Los mecanismos que regulan gamma-H2A.X y su papel en la remodelación de la cromatina durante la reparación del ADN no se comprenden completamente.
Objetivo del estudio:
- Para dilucidar el mecanismo regulador de la fosforilación gamma-H2A.X durante la respuesta al daño del ADN.
- Para investigar el papel del factor de transcripción del síndrome de Williams-Beuren (WSTF) en la reparación del ADN.
- Para identificar nuevas actividades de la quinasa involucradas en la remodelación de la cromatina.
Principales métodos:
- Investigó la actividad enzimática de WSTF, un componente del complejo WICH.
- Se utilizaron ensayos bioquímicos para detectar la actividad de la tirosina quinasa dentro del WSTF.
- Analizó la fosforilación de H2A.X en Tyr 142 por WSTF en el contexto de daño al ADN.
Principales resultados:
- Se descubrió que WSTF posee actividad intrínseca de tirosina quinasa a través de un dominio único.
- Se ha demostrado que el WSTF fosforila directamente el H2A.X en Tyr 142.
- La actividad WSTF mostrada es crucial para regular los eventos clave en la vía de respuesta al daño del ADN.
Conclusiones:
- Identificó un nuevo mecanismo regulador para la respuesta al daño del ADN mediada por WSTF.
- Amplió la comprensión de los dominios de proteínas con actividad intrínseca de la tirosina quinasa.
- Destacó el papel crítico de WSTF en el mantenimiento de la integridad genómica a través de la fosforilación H2A.X y la remodelación de la cromatina.
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