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Diseño de un dominio inducible por la proteína quinasa
Shalini Balakrishnan1, Neal J Zondlo
1Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
Journal of the American Chemical Society
|April 28, 2006
Resumen
Los investigadores diseñaron un nuevo motivo de proteína que cambia su estructura tras la fosforilación. Este dominio inducible a la quinasa permite la detección sensible de la actividad de la proteína quinasa utilizando la luminiscencia del lantánido.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Ingeniería de proteínas Ingeniería de proteínas.
Sus antecedentes:
- La fosforilación de las proteínas es un mecanismo regulador celular clave.
- Las herramientas existentes para el monitoreo de la actividad de la quinasa y la fosfatasa requieren mejoras.
- Se necesitan nuevos biosensores para interrogar la actividad de la quinasa en tiempo real.
Objetivo del estudio:
- Para diseñar un nuevo motivo de proteína, el dominio inducible por kinasa (KID).
- Para crear una herramienta que responda a la actividad de la proteína quinasa y la fosfatasa.
- Desarrollar un sensor genéticamente codificado para la actividad de la quinasa.
Principales métodos:
- Principios de diseño de proteínas aplicados para crear una estructura dependiente de la fosforilación.
- Incorporación de un bucle de unión de calcio EF de mano con un residuo de serina modificado.
- Integración del triptófano para la luminiscencia de los lantánidos y los motivos de reconocimiento de la quinasa (PKA, PKC, Erk).
- Caracterización utilizando luminiscencia de terbium (Tb3+) y resonancia magnética nuclear (RMN).
Principales resultados:
- Los péptidos KID diseñados se unen a Tb3+ y exhiben una fuerte luminiscencia (544 nm) tras la fosforilación.
- Los péptidos no fosforilados muestran una luminiscencia débil, lo que indica un cambio significativo de la señal.
- El cambio de luminiscencia es comparable o excede a los sensores de quinasa existentes.
- La RMN confirmó la unión de lantánidos específica del sitio.
Conclusiones:
- El dominio inducible por kinasa es un nuevo motivo de proteína sensible a la fosforilación.
- Los péptidos KID pueden servir como reporteros sensibles de la actividad de la serina/treonina quinasa.
- El diseño del motivo permite su uso potencial como etiquetas de actividad de kinasa codificadas genéticamente.
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