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La degradación de Tec1 regulada por Fus3 a través de SCFCdc4 determina la especificidad de señalización de MAPK
Song Chou1, Lan Huang, Haoping Liu
1Department of Biological Chemistry, University of California, Irvine, Irvine, CA 92697, USA.
Cell
|December 29, 2004
Resumen
La Fus3 quinasa previene la filamentación de la levadura durante el apareamiento al dirigirse a la proteína Tec1 para su degradación. Este mecanismo específico asegura una respuesta celular adecuada a las diferentes señales ambientales.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología molecular La biología molecular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Las cascadas de proteína quinasa activada por mitógeno (MAPK) regulan el crecimiento y la diferenciación celular.
- En la levadura Saccharomyces cerevisiae, distintas vías MAPK controlan el apareamiento y la filamentación.
- Fus3 MAPK debe evitar la filamentación durante el apareamiento, pero el mecanismo no está claro.
Objetivo del estudio:
- Para dilucidar cómo Fus3 impide la activación del programa de filamentación durante la respuesta de feromonas.
- Para identificar los actores moleculares involucrados en la inhibición de la filamentación mediada por Fus3.
Principales métodos:
- Investigó la degradación de Tec1, un cofactor de filamentación, durante la respuesta de las feromonas.
- Se utilizaron ensayos in vitro e in vivo para estudiar la ubiquitinación mediada por Fus3 y la degradación de Tec1.1.
- Examinó el papel de la fosforilación de Tec1 en T273 en su ubiquitinación y degradación.
Principales resultados:
- Tec1, un cofactor para la expresión génica de la filamentación, se degrada rápidamente durante la respuesta de las feromonas.
- La cinasa Fus3 induce directamente la ubiquitinación y degradación de Tec1 a través de la ligasa de ubiquitina SCF-Cdc4.
- La fosforilación de Tec1 en la treonina 273 por Fus3 es esencial para su ubiquitinación y degradación.
Conclusiones:
- Fus3 inhibe el crecimiento filamentoso durante el apareamiento promoviendo la degradación del cofactor Tec1.
- Esta degradación está mediada por la fosforilación dependiente de Fus3 de Tec1, dirigida a la ubiquitinación y la destrucción proteasómica.
- Esto proporciona un mecanismo clave para garantizar la especificidad de la señalización en vías MAPK paralelas.
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