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El virus del sarcoma de Rous transforma proteínas carentes de ácido mirístico fosforilados conocidos sustratos
Cell
|April 11, 1986
Resumen
La mutagenesis de p60src, la proteína transformadora del virus del sarcoma de Rous, impide la unión a la membrana pero mantiene la actividad de la quinasa. Esto sugiere que la fosforilación de proteínas asociadas a la membrana, no solo la actividad de la quinasa, es crucial para la transformación celular.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Virología Virología.
- Biología celular Biología celular.
Sus antecedentes:
- El virus del sarcoma de Rous (RSV) transforma las células a través de su proteína p60src.
- p60src posee actividad de tirosina proteína quinasa y requiere miristilación para la asociación de membrana.
Objetivo del estudio:
- Investigar el papel de la miristilación de p60src y la localización de la membrana en la transformación celular inducida por el RSV.
- Para determinar la correlación entre la actividad de la quinasa p60src, la fosforilación del sustrato y los fenotipos de transformación celular.
Principales métodos:
- Generó proteínas mutantes p60src que carecen de miristilación y unión a la membrana.
- Células infectadas con el RSV mutante y análisis de fosforilación tirosina de proteínas celulares.
- Fenotipos celulares evaluados, incluido el crecimiento independiente del anclaje, la organización citoesquelética y la secreción de fibronectina / proteasa.
Principales resultados:
- El mutante p60src retuvo la actividad de la tirosina proteína quinasa pero no pudo transformar las células.
- Los fenotipos celulares asociados con la transformación no fueron inducidos por virus mutantes.
- Se produjo una extensa fosforilación de tirosina de sustratos conocidos de p60src, que difieren cuantitativamente de las células transformadas de tipo salvaje.
Conclusiones:
- La miristilación y la localización en la membrana de p60src son esenciales para la transformación celular inducida por el virus del sarcoma de Rous.
- La fosforilación de proteínas específicas asociadas a la membrana, aún no identificadas, es probablemente crítica para la transformación.
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