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Bcl10 activa la vía NF-kappaB a través de la ubiquitinación de NEMO
Honglin Zhou1, Ingrid Wertz, Karen O'Rourke
1Department of Molecular Oncology, Genentech Inc. 1 DNA Way, South San Francisco, California 94080, USA.
Nature
|December 26, 2003
Resumen
La proteína adaptadora Bcl10 activa los factores de transcripción NF-kappaB al dirigirse a NEMO para la ubiquitinación. Este proceso, dependiente de la paracaspasa y UBC13, es crucial para la proliferación de los linfocitos.
Área de la Ciencia:
- Inmunología Inmunología.
- Biología Molecular Biología Molecular
- La señalización celular de las células.
Sus antecedentes:
- Los factores de transcripción del factor nuclear-kappaB (NF-kappaB) regulan las respuestas inmunes y son activados por varios estímulos.
- Bcl10 es crítico para la activación de NF-kappaB en los linfocitos a través de la señalización del antígeno-receptor, pero se desconoce su mecanismo preciso.
Objetivo del estudio:
- Para aclarar el mecanismo celular por el cual Bcl10 activa la vía NF-kappaB.
Principales métodos:
- Se investigó la interacción de Bcl10 con NEMO (modulador esencial de NF-kappaB).
- NEMO mutante utilizado que carece de sitios de ubiquitinación.
- Se emplearon ARN interferentes cortos (siARN) para evaluar las funciones de la paracaspasa y UBC13.
Principales resultados:
- Bcl10 se dirige a NEMO para ubiquitinación ligada a la lisina-63.
- Un mutante de NEMO no ubicuitinatable bloqueó la activación de NF-kappaB inducida por Bcl10.
- La paracaspasa y la UBC13 son esenciales para la ubiquitinación NEMO mediada por Bcl10 y la activación de NF-kappaB.
Conclusiones:
- Bcl10 actúa como una proteína adaptadora para promover la activación de NF-kappaB.
- Esta activación se produce a través de la ubiquitinación dependiente de la paracaspasa y UBC13 de NEMO.
- Esta vía es vital para la señalización de NF-kappaB en los linfocitos.
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