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Determinantes estructurales de la activación del ligando alostérico en los heterodímeros RXR
Andrew I Shulman1, Christopher Larson, David J Mangelsdorf
1Howard Hughes Medical Institute, Department of Pharmacology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA.
Cell
|March 16, 2004
Resumen
Los receptores nucleares utilizan la comunicación alostérica para la regulación de los genes. Este estudio identifica una red energética dentro de estos receptores, revelando cómo discriminan entre diferentes señales de ligando.
Área de la Ciencia:
- Biología molecular La biología molecular.
- Biología estructural Biología estructural.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La comunicación alostérica es crucial para la función de los receptores nucleares y la regulación de los genes dependientes de ligandos.
- Las bases energéticas de la comunicación alostérica dentro de los receptores nucleares no se comprenden bien.
- Los receptores nucleares juegan un papel vital en varios procesos fisiológicos, incluyendo el metabolismo y el desarrollo.
Objetivo del estudio:
- Para identificar la red energética que media la comunicación alostérica en los receptores nucleares.
- Investigar el papel de esta red en la discriminación de ligandos y la respuesta transcripcional.
- Comprender las bases estructurales de la especificidad de la señal en la señalización de los receptores nucleares.
Principales métodos:
- Utilizó el análisis estadístico de acoplamiento (SCA), un método basado en secuencias, para detectar aminoácidos coevolving.
- Identificó una red de residuos acoplados energéticamente que unen superficies funcionales en dominios de unión de ligandos de receptores nucleares.
- Se realizó un análisis funcional de los residuos previstos a través de estudios de mutación.
Principales resultados:
- Identificó una red de residuos acoplados energéticamente esenciales para la comunicación alostérica en los receptores nucleares.
- Se demostró que esta red rige la activación transcripcional de los receptores heterodiméricos en la unión de ligandos.
- Se demostró que las mutaciones en residuos de una sola red pueden diferenciar las respuestas a varios agonistas (endocrino, dietético, sintético).
Conclusiones:
- Reveló una red estructural crítica para la comunicación alostérica en los heterodímeros RXR.
- Sugiere que la especificidad de la respuesta del ligando y la permisividad del receptor evolucionaron para permitir una discriminación precisa de la señal.
- Proporciona información sobre los mecanismos moleculares subyacentes a la señalización mediada por receptores nucleares y el desarrollo de fármacos.
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