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Las proteínas del adenovirus E1A pueden disociar complejos heteroméricos que involucran el factor de transcripción
S Bagchi1, P Raychaudhuri, J R Nevins
1Howard Hughes Medical Institute, Duke University Medical Center, Durham, North Carolina 27710.
Cell
|August 24, 1990
Resumen
Las proteínas del adenovirus E1A liberan el factor de transcripción E2F de los complejos celulares. Esto permite la interacción de la proteína E4 con E2F, promoviendo la unión estable al ADN y estimulando la transcripción.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Virología Virología.
- Regulación genética Reglamento genético.
Sus antecedentes:
- La infección por adenovirus implica el factor de transcripción E2F, que se une a los promotores de forma estable a través de un complejo con un producto genético E4.
- Los factores celulares se asocian naturalmente con E2F en células no infectadas, lo que podría regular su actividad.
Objetivo del estudio:
- Investigar el papel de las proteínas del adenovirus E1A en la modulación de la formación del complejo del factor de transcripción E2F.
- Para aclarar el mecanismo por el cual E1A influye en las interacciones E2F y la posterior activación transcripcional.
Principales métodos:
- Análisis de las interacciones proteína-proteína en extractos celulares utilizando ensayos bioquímicos.
- Investigación de los dominios funcionales de la proteína E1A requeridos para la disociación del complejo E2F.
Principales resultados:
- Las proteínas del adenovirus E1A disocian los factores celulares de E2F en las células no infectadas, liberando E2F libre.
- La actividad de disociación de E1A depende del dominio 2 conservado pero no del dominio 3 conservado.
- El E2F disociado interactúa fácilmente con la proteína E4, formando un complejo estable en el promotor E2 y mejorando la transcripción.
Conclusiones:
- La proteína E1A del adenovirus posee una nueva función en la disociación de complejos de factores de transcripción.
- Esta disociación por E1A facilita nuevas interacciones de proteínas, alterando la especificidad transcripcional durante la infección viral.
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