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Reclutamiento regulado por el crecimiento del activador del gen Ifh1 de la proteína ribosómica esencial de la
Stephan B Schawalder1, Mehdi Kabani, Isabelle Howald
1Department of Molecular Biology and NCCR Program Frontiers in Genetics University of Geneva, Sciences III, 30, quai Ernest-Ansermet, Geneva 4, CH-1211, Switzerland.
Nature
|December 24, 2004
Resumen
La proteína esencial Ifh1 activa los promotores de genes de la proteína ribosómica (RP) en la levadura bajo un crecimiento óptimo. La unión de Ifh1 está regulada por Fhl1 y disminuye durante el estrés, lo que afecta el control del crecimiento celular.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- Genética de la levadura Genética de la levadura
Sus antecedentes:
- La biogénesis del ribosoma es crucial para el control del crecimiento celular.
- Los genes de la proteína ribosómica (RP) se transcriben en gran medida en la levadura, pero se regulan a la baja durante el estrés.
- Las vías de señalización como TOR regulan la transcripción del gen RP, pero el control de la iniciación no está claro.
Objetivo del estudio:
- Para investigar la regulación de la iniciación del gen RP en Saccharomyces cerevisiae.
- Para identificar las proteínas clave involucradas en el control de la transcripción del gen RP en diversas condiciones.
Principales métodos:
- Inmunoprecipitación de cromatina para evaluar la unión de proteínas a los promotores del gen RP.
- Análisis de las interacciones Ifh1 y Fhl1 y reclutamiento.
- Estudiar la regulación del gen RP en condiciones de inhibición de TOR, agotamiento de nutrientes y liberación por inanición.
Principales resultados:
- La proteína esencial Ifh1 se une y activa muchos promotores del gen RP en la levadura.
- Ifh1 es reclutado para los promotores del gen RP a través del dominio asociado a la mampara de Fhl1.
- La unión de Ifh1 se reduce durante la inhibición de TOR y el agotamiento de nutrientes y se restaura tras la liberación por inanición.
Conclusiones:
- Ifh1 juega un papel central en la activación de los promotores del gen RP en condiciones óptimas de crecimiento.
- Fhl1 media el reclutamiento de Ifh1 a los promotores del gen RP.
- Ifh1 y Fhl1 son reguladores clave de la expresión génica de RP, vinculando las señales ambientales a la biogénesis del ribosoma.
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