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La fosforilación del factor de unión CPE por Eg2 regula la traducción del ARNm c-mos
R Mendez1, L E Hake, T Andresson
1Department of Molecular Genetics and Microbiology, University of Massachusetts Medical Center, Worcester 01655, USA.
Nature
|April 5, 2000
Resumen
La progesterona desencadena la maduración de los ovocitos de Xenopus mediante la activación de una vía de señalización que conduce a la traducción del ARNm c-mos. Este proceso requiere la fosforilación de CPEB por Eg2, un paso clave para la maduración de los ovocitos.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- Los ovocitos de Xenopus se detienen en G2/M de la meiosis I, lo que requiere progesterona para la maduración.
- La progesterona inicia una vía no transcripcional que estimula la traducción del ARNm c-mos.
- La traducción del ARNm c-mos está regulada por la poliadenilación citoplasmática, que involucra elementos CPE y AAUAAA.
Objetivo del estudio:
- Para dilucidar los eventos de señalización que desencadenan la poliadenilación y la traducción del ARNm c-mos.
- Para identificar el factor responsable de la activación de CPEB, el factor de unión CPE.
- Para determinar el papel de la fosforilación de CPEB en la maduración de los ovocitos.
Principales métodos:
- Investigó el papel de la fosforilación de CPEB en la poliadenilación y traducción del ARNm c-mos.
- Utilizó modelos de ovocitos de Xenopus para estudiar la maduración meiotica.
- Examinó la actividad catalítica de Eg2, un miembro de la familia de la aurora quinasa, en CPEB.
Principales resultados:
- Se demostró que la fosforilación temprana específica del sitio de CPEB es esencial para la poliadenilación y la traducción del ARNm c-mos.
- Se demostró que esta fosforilación es crítica para la maduración de los ovocitos.
- Se identificó a Eg2 como la quinasa que cataliza la fosforilación selectiva de CPEB.
Conclusiones:
- La fosforilación temprana de CPEB por Eg2 es un paso regulatorio crucial para la traducción del ARNm c-mos y la maduración de los ovocitos de Xenopus.
- Este hallazgo aclara un evento clave de señalización en la reanudación meiótica inducida por la progesterona.
- El papel de Eg2 resalta la importancia de las cinasas Aurora en los procesos de desarrollo.
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