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El factor de crecimiento epidérmico regula la p21ras a través de la formación de un complejo de receptor, la proteína
1Signal Transduction Laboratory, Imperial Cancer Research Fund, Lincoln's Inn Fields, London, England.
Cell
|May 7, 1993
Resumen
La señalización del factor de crecimiento epidérmico (EGF) activa la proteína Son de sevenless (Sos), un regulador clave de la señalización Ras. Esta activación implica el reclutamiento de Sos al receptor EGF a través de la proteína adaptadora Grb2.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La señalización celular de las células.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Son of sevenless (Sos) es un factor de intercambio de nucleótidos de guanina para p21ras.
- La señalización del receptor del factor de crecimiento epidérmico (EGF) es crucial para el crecimiento y la diferenciación celular.
- Grb2 es una proteína adaptadora que contiene los dominios SH2 y SH3 involucrados en la transducción de señales.
Objetivo del estudio:
- Aclarar el mecanismo por el cual el FEAG estimula la actividad de intercambio de nucleótidos de Sos en p21ras.
- Investigar el papel de Grb2 y del receptor EGF en la activación de Sos.
Principales métodos:
- Los ensayos de coinmunoprecipitación detectan las interacciones proteína-proteína.
- Experimentos de reconstitución in vitro para evaluar el ensamblaje del complejo proteico.
- Ensayos del sistema celular permeabilizado para medir la actividad de intercambio de nucleótidos.
Principales resultados:
- Sos coinmunoprecipita con el receptor del EGF en las células estimuladas por el EGF.
- Grb2 es esencial para la interacción entre el receptor activado del FEAG y Sos.
- Un fosfopéptido en la tirosina 1068 del receptor del FEAG inhibe la formación de complejos y la señalización aguas abajo.
Conclusiones:
- La activación inducida por el FEAG del intercambio de nucleótidos p21ras implica el reclutamiento de Sos a un complejo de membrana plasmática.
- Este complejo incluye el receptor del FEAG y la proteína adaptadora Grb2.
- La interacción está mediada por eventos específicos de fosforilación en el receptor del FEAG.
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