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La polocinasa controla la transcripción dependiente del ciclo celular al dirigirse a una proteína coactivadora
Zoulfia Darieva1, Richard Bulmer, Aline Pic-Taylor
1Faculty of Life Sciences, University of Manchester, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK.
Nature
|November 24, 2006
Resumen
La polocinasa Cdc5p controla la expresión génica dependiente del ciclo celular, esencial para la mitosis. La fosforilación de Ndd1p por Cdc5p asegura la expresión adecuada de los reguladores mitóticos clave como CLB2.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- Las polokinasas son vitales para la regulación del ciclo celular eucariótico durante la mitosis.
- El control de la expresión génica de los reguladores clave es crucial para la progresión del ciclo celular.
- El modelo de eucariota Saccharomyces cerevisiae se utiliza para estudiar los mecanismos conservados del ciclo celular.
Objetivo del estudio:
- Para investigar el papel de la polocinasa Cdc5p en la expresión génica dependiente del ciclo celular.
- Para dilucidar el mecanismo por el cual Cdc5p regula la expresión génica mitótica.
- Para determinar el impacto de la regulación mediada por Cdc5p en la división celular.
Principales métodos:
- Investigó el reclutamiento temporal de Cdc5p a los promotores de genes.
- Se analizó la fosforilación de la proteína Ndd1p por Cdc5p.
- Evaluó la expresión de genes regulados por el ciclo celular (por ejemplo, CLB2, SWI5) en cepas de tipo salvaje y mutantes.
- Se observaron fenotipos de división celular en ausencia de la función Cdc5p.
Principales resultados:
- Cdc5p es reclutado para los promotores del grupo de genes CLB2 durante fases específicas del ciclo celular.
- Cdc5p directamente fosforila el coactivador Ndd1p dentro del complejo Mcm1p-Fkh2p-Ndd1p.
- Esta fosforilación es esencial para la correcta expresión temporal de los genes de fase G2/M, incluidos CLB2 y SWI5.5.
- La pérdida de la fosforilación Ndd1p mediada por Cdc5p conduce a importantes defectos en la división celular.
Conclusiones:
- Cdc5p juega un papel crítico en la regulación de la expresión génica dependiente del ciclo celular requerida para la mitosis.
- La fosforilación de Ndd1p por Cdc5p es un mecanismo clave para la producción de reguladores mitóticos esenciales.
- La actividad de la polocinasa es necesaria tanto para la orquestación de eventos mitóticos como para la producción de proteínas reguladoras, expandiendo sus funciones conocidas.
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