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Dinámicas de fosforilación globales, in vivo y específicas del sitio en las redes de señalización
Jesper V Olsen1, Blagoy Blagoev, Florian Gnad
1Center for Experimental BioInformatics, Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense, Denmark.
Cell
|November 4, 2006
Resumen
Este estudio introduce un método de espectrometría de masas para mapear los sitios de fosforilación de proteínas. Revela cómo la estimulación del factor de crecimiento epidérmico (EGF) altera dinámicamente estos sitios, ofreciendo información sobre las redes de señalización celular.
Área de la Ciencia:
- Biología celular Biología celular.
- La bioquímica es la bioquímica.
- La proteómica es la proteómica.
Sus antecedentes:
- La señalización celular se basa en las modificaciones de proteínas post-traducionales, principalmente la fosforilación proteica reversible.
- Comprender los cambios dinámicos de fosforilación es crucial para descifrar la regulación celular.
Objetivo del estudio:
- Desarrollar y aplicar una tecnología de espectrometría de masas para identificar y cuantificar sitios de fosforilación.
- Para analizar la dinámica temporal de la fosforilación en respuesta a la estimulación del factor de crecimiento epidérmico (EGF).
- Para crear una base de datos completa (Phosida) de datos dinámicos del fosfoproteoma.
Principales métodos:
- Utilizó espectrometría de masas para la identificación y cuantificación de sitios de fosforilación.
- Células HeLa estimuladas con factor de crecimiento epidérmico (EGF) para observar cambios dinámicos.
- Registró y analizó la dinámica temporal de los sitios de fosforilación y sus ubicaciones subcelulares.
Principales resultados:
- Se identificaron 6.600 sitios de fosforilación en 2.244 proteínas.
- Dinámica temporal documentada de estos sitios después de la estimulación del FEAG en la base de datos Phosida.
- Se encontró que el 14% de los sitios mostraron al menos una modulación doble por el FEAG, con perfiles temporales diversos.
- Se observó que la mayoría de las proteínas tienen múltiples sitios de fosforilación con diferentes cinéticas, lo que sugiere plataformas de integración de señales.
- Objetivos identificados incluyen kinasas, ligasas de ubiquitina, factores de intercambio de nucleótidos de guanina y reguladores de la transcripción.
Conclusiones:
- El fosfoproteoma dinámico proporciona un eslabón crítico para una visión global de la regulación celular.
- Múltiples sitios de fosforilación en las proteínas actúan como plataformas para la integración de señales celulares.
- Esta tecnología permite un análisis exhaustivo de la dinámica de fosforilación en respuesta a estímulos.
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