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La estructura cristalina del inhibidor de la cinasa dependiente de la ciclina p27Kip1 unido al complejo ciclina
A A Russo1, P D Jeffrey, A K Patten
1Cellular Biochemistry and Biophysics Program, Howard Hughes Medical Institute, Memorial Sloan-Kettering Cancer Center, New York 10021, USA.
Nature
|July 25, 1996
Resumen
La estructura cristalina revela cómo la proteína p27Kip1 humana inhibe la ciclina A-cinasa dependiente de la ciclina 2 (Cdk2) al unirse al complejo. Esta interacción reorganiza Cdk2 e imita la unión de ATP en la hendidura catalítica.
Área de la Ciencia:
- Biología Estructural Biología estructural.
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Las cinasas dependientes de ciclina (CDK) son reguladores cruciales del ciclo celular.
- La actividad anormal de CDK está relacionada con varios tipos de cáncer.
- p27Kip1 es un inhibidor conocido de la actividad CDK, pero su mecanismo de unión preciso no estaba claro.
Objetivo del estudio:
- Para determinar la estructura cristalina de alta resolución del dominio inhibidor de la quinasa p27Kip1 humano unido al complejo fosforilado ciclina A-Cdk2.
- Para dilucidar las interacciones moleculares que gobiernan la inhibición de la p27Kip1 de la ciclina A-Cdk2.2.
Principales métodos:
- Se empleó cristalografía de rayos X para determinar la estructura.
- La estructura fue resuelta a una resolución de 2.3 angstroms.
Principales resultados:
- La estructura cristalina revela que p27Kip1 se une al complejo ciclina A-Cdk2 como una conformación extendida.
- p27Kip1 interactúa tanto con la ciclina A como con la Cdk2.
- Las interacciones específicas incluyen la unión en una ranura en la ciclina A y la reorganización del lóbulo amino-terminal de Cdk2.
- p27Kip1 se inserta en la hendidura catalítica de Cdk2, imitando la unión de ATP.
Conclusiones:
- La estructura determinada proporciona una base molecular detallada para el mecanismo inhibidor de p27Kip1 contra la ciclina A-Cdk2.
- La comprensión de esta interacción podría informar el desarrollo de terapias dirigidas para los cánceres asociados con la actividad desregulada de las CDK.
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