La regulación de la función del corepresor por el NADH nuclear
Qinghong Zhang1, David W Piston, Richard H Goodman
1Vollum Institute, Oregon Health Sciences University, 3181 SW Sam Jackson Park Road, Portland, OR 97201, USA.
Science (New York, N.Y.)
|February 16, 2002
Resumen
La proteína de unión carboxilo-terminal (CtBP) actúa como un sensor redox, con su unión regulada por la relación NAD+/NADH. Este mecanismo influye en la transcripción génica, impactando los procesos celulares como el desarrollo y la regulación del ciclo celular.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La bioquímica es la bioquímica.
- Biología celular Biología celular.
Sus antecedentes:
- La proteína de unión carboxilo-terminal (CtBP) es un corepresor crucial para la regulación de la transcripción.
- CtBP juega un papel en el desarrollo, el control del ciclo celular y la transformación celular.
- Los mecanismos precisos de regulación de la CtBP, en particular su interacción con los represores transcripcionales, no se comprenden completamente.
Objetivo del estudio:
- Para investigar el papel de los dinucleótidos de nicotinamida adenina (NAD+ y NADH) en la regulación de la unión de CtBP a los represores transcripcionales.
- Para determinar los niveles in vivo de NAD+/NADH nuclear y su correlación con la actividad de CtBP.
- Para explorar el potencial de CtBP como un sensor redox celular.
Principales métodos:
- Se utilizó la microscopía de dos fotones para medir los niveles de NAD+/NADH en el núcleo libre.
- Se evaluó la unión de CtBP a los represores celulares y virales en respuesta a diferentes concentraciones de NAD+/NADH.
- Investigó los efectos de los agentes que modulan los niveles de NADH en la represión mediada por CtBP in vivo.
Principales resultados:
- La unión de CtBP a los represores transcripcionales está modulada por NAD+ y NADH, siendo NADH significativamente más potente.
- Los niveles de NAD + / NADH nucleares medidos necesarios para la unión CtBP a la mitad de la máxima son más bajos que los informados anteriormente.
- El aumento de los niveles de NADH in vivo mejora la unión a CtBP y potencia la represión transcripcional mediada por CtBP.
Conclusiones:
- CtBP funciona como un sensor redox, utilizando la relación NAD + / NADH para regular su interacción con los socios de transcripción.
- Los hallazgos revelan un nuevo mecanismo regulador para CtBP, que vincula el estado redox celular con el control de la transcripción.
- Esto proporciona información sobre el papel de CtBP en los procesos celulares fundamentales y los estados de la enfermedad.
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