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Asociación de la cdk2 quinasa con el factor de transcripción E2F durante la fase S
M Pagano1, G Draetta, P Jansen-Dürr
1European Molecular Biology Laboratory, Heidelberg, Germany.
Science (New York, N.Y.)
|February 28, 1992
Resumen
El factor de transcripción E2F interactúa con la ciclina A y la proteína quinasa cdk2 durante la fase S del ciclo celular. Esta interacción requiere una cinasa cdk2 activa, lo que sugiere un papel en la regulación de la proliferación celular.
Área de la Ciencia:
- Biología molecular La biología molecular.
- Regulación del ciclo celular Regulación del ciclo celular
- La oncogénesis es la oncogénesis.
Sus antecedentes:
- El factor de transcripción E2F regula los genes esenciales para la proliferación celular.
- E2F es un objetivo conocido del oncogén del adenovirus E1A.
- La progresión del ciclo celular implica complejas redes reguladoras que incluyen proteínas cinasas y ciclinas.
Objetivo del estudio:
- Para investigar la interacción entre E2F, ciclina A y cdk2 proteína quinasa en las células humanas.
- Para determinar la unión específica del ciclo celular de cdk2 a E2F.
- Para aclarar el papel de la actividad de la cdk2 quinasa en la formación del complejo E2F.
Principales métodos:
- Los ensayos de coinmunoprecipitación detectan complejos proteicos.
- Western blotting para analizar la expresión de proteínas y la fase del ciclo celular.
- Pruebas de quinasa para evaluar la actividad de cdk2.
Principales resultados:
- La ciclina A y la proteína quinasa cdk2 se encontraron en complejos con E2F en células humanas.
- La unión de Cdk2 a E2F se observó específicamente durante la fase S del ciclo celular.
- Los niveles totales de cdk2 se mantuvieron constantes durante todo el ciclo celular, pero su unión a E2F fue dependiente del ciclo celular.
Conclusiones:
- La interacción entre cdk2 y E2F está regulada por el ciclo celular.
- Se requiere una cinasa cdk2 activa, probablemente compleja con ciclina A, para la unión con E2F.
- Estos hallazgos sugieren un mecanismo por el cual la expresión génica mediada por E2F se controla durante la proliferación celular.
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