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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
La conjugación NEDD8 mediada por Mdm2 de p53 inhibe su actividad transcripcional
Dimitris P Xirodimas1, Mark K Saville, Jean-Christophe Bourdon
1University of Dundee, Ninewells Hospital and Medical School, Department of Surgery and Molecular Oncology, Dundee DD1 9SY, UK.
Cell
|July 10, 2004
Resumen
La ligasa Mdm2 E3 modifica el supresor tumoral p53 con NEDD8, inhibiendo su actividad transcripcional. Esto revela Mdm2
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Investigación del cáncer Investigación del cáncer.
- Biología de la ubiquitina.
Sus antecedentes:
- La vía de conjugación NEDD8 regula principalmente los complejos de ubiquitina ligasa del SCF.
- La E3 ligasa Mdm2 es conocida por su papel en la ubiquitinación y degradación de p53.
- La función de la modificación NEDD8 en sustratos no-SCF sigue siendo en gran parte inexplorada.
Objetivo del estudio:
- Para investigar el papel de Mdm2 en la conjugación NEDD8.
- Para determinar el efecto de la modificación NEDD8 mediada por Mdm2 en la actividad de p53.
- Para explorar la participación de Mdm2 en ambas vías de conjugación ubiquitina y NEDD8.
Principales métodos:
- Utilizó una línea celular mutante de conjugación NEDD8 sensible a la temperatura (TS-41).
- Empleado un mutante p53 resistente a la NEDDilación (3NKR).
- Se evaluó la modificación NEDD8 dependiente de Mdm2 de p53 y su impacto en la actividad transcripcional.
Principales resultados:
- Se demostró que Mdm2 media la modificación NEDD8 del supresor tumoral p53.
- Se demostró que Mdm2 en sí mismo se somete a NEDD8 modificación.
- Se confirmó que la NEDDilación dependiente de Mdm2 de p53 inhibe su actividad transcripcional.
Conclusiones:
- Mdm2 funciona como una ligasa E3 en ambas vías de conjugación ubiquitina y NEDD8.
- La modificación NEDD8 de p53 por Mdm2 sirve como un mecanismo regulador que controla la función de p53.
- Esto amplía las funciones conocidas de las ligasas E3 en la regulación de las proteínas del sustrato.
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