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FAN, una nueva proteína de repetición de WD, acopla el receptor p55 TNF con la esfingomielinasa neutra
S Adam-Klages1, D Adam, K Wiegmann
1Institut für Immunologie, Christian-Albrechts-Universität Kiel, Federal Republic of Germany.
Cell
|September 20, 1996
Resumen
Los investigadores identificaron FAN, una nueva proteína que se une al receptor del factor de necrosis tumoral (TNF-R55). FAN regula la producción de ceramida a través de la esfingomielinasa neutra (N-SMasa), un paso clave en las vías de señalización del TNF.
Área de la Ciencia:
- Las vías de señalización celular.
- Biología molecular La biología molecular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La señalización intracelular iniciada por el receptor del factor de necrosis tumoral de 55 kDa (TNF-R55) implica intermediarios de proteínas que interactúan con sus dominios citoplasmáticos.
- Un motivo específico de nueve aminoácidos dentro de la región citoplasmática del TNF-R55 es crucial para activar la esfingomielinasa neutra (N-SMase).
Objetivo del estudio:
- Para identificar nuevos intermediarios de proteínas involucrados en la señalización del TNF-R55.
- Para aclarar el papel de estos intermediarios en la activación de la N-SMasa y los sucesos de señalización posteriores.
Principales métodos:
- Utilizó el sistema de trampa de interacción de levadura para detectar proteínas que interactúan.
- Empleó una biblioteca de escaneo de péptidos para identificar motivos de unión.
- Investigó el efecto de la expresión de la proteína FAN (de longitud completa y mutantes) en la actividad de la N-SMasa en células tratadas con TNF.
Principales resultados:
- Identificaron una nueva proteína de repetición WD, denominada FAN, que se une específicamente al motivo de los nueve aminoácidos en TNF-R55.5.
- La sobreexpresión de FAN de longitud completa mejoró la actividad de la N-SMasa en células estimuladas con TNF.
- Los mutantes truncados de FAN exhibieron efectos negativos dominantes, inhibiendo la actividad de la N-SMasa.
Conclusiones:
- FAN actúa como un regulador crucial en la señalización intracelular mediada por TNF-R55.
- La interacción de FAN con el TNF-R55 modula la actividad de la N-SMasa, lo que afecta la producción de ceramida y las vías de señalización del TNF.
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