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MDC1 está acoplado a CHK2 activado en las vías de respuesta al daño del ADN de los mamíferos
Zhenkun Lou1, Katherine Minter-Dykhouse, Xianglin Wu
1Department of Oncology, Mayo Foundation, Rochester, Minnesota 55905, USA.
Nature
|February 28, 2003
Resumen
La proteína mediadora del punto de control del daño del ADN 1 (MDC1) es crucial para las respuestas al daño del ADN. Su dominio FHA se une a CHK2, facilitando la reparación del ADN y los puntos de control del ciclo celular.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología molecular La biología molecular.
- Genética La genética.
Sus antecedentes:
- Los dominios Forkhead-homology-associated (FHA) son módulos de proteínas que reconocen los motivos fosforilados.
- Su papel en la señalización de la respuesta al daño del ADN de los mamíferos no se comprende completamente.
Objetivo del estudio:
- Investigar la función de la proteína MDC1 que contiene el dominio FHA en las respuestas al daño del ADN.
- Para aclarar el mecanismo de la participación de MDC1 en la vía ATM/CHK2.
Principales métodos:
- Estudios de localización de MDC1 en las rupturas del ADN.
- Pruebas de coinmunoprecipitación para detectar la asociación MDC1-CHK2.
- La interferencia del ARN para suprimir la expresión de MDC1.
- Análisis del punto de control del ciclo celular y la apoptosis después del daño del ADN.
Principales resultados:
- MDC1 se localiza en las rupturas del ADN y se une al CHK2 fosforilado a través de su dominio FHA.
- MDC1 es fosforilado de una manera dependiente de ATM/CHK2.
- La supresión de MDC1 afecta el punto de control de la fase S y la apoptosis, con un deterioro de la estabilización de p53.
- El MDC1 de tipo salvaje, pero no el MDC1 eliminado del dominio FHA, restaura estas funciones.
Conclusiones:
- MDC1 es reclutado para activar CHK2 a través de su dominio FHA.
- MDC1 juega un papel crítico en las respuestas de daño al ADN mediadas por CHK2, incluido el control del punto de control y la apoptosis.
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