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FUS3 codifica una quinasa relacionada con cdc2+/CDC28 requerida para la transición de la mitosis a la conjugación
E A Elion1, P L Grisafi, G R Fink
1Whitehead Institute for Biomedical Research, Nine Cambridge Center, Massachusetts 02142.
Cell
|February 23, 1990
Resumen
El gen FUS3 es crucial para la detención del ciclo celular de la levadura y el apareamiento. Los mutantes Fus3 no se detienen, pero este defecto es suprimido por mutaciones en CLN3, lo que indica FUS33.
Área de la Ciencia:
- * Biología Molecular y Celular.
- * La genética de la levadura.
- * Regulación del ciclo celular.
Sus antecedentes:
- * La progresión del ciclo celular y el apareamiento son procesos críticos en la levadura.
- * Se ha investigado el papel del gen FUS3 en estos procesos.
- * Estudios previos sugieren que FUS3 está involucrado en las vías de transducción de señales.
Objetivo del estudio:
- * Para aclarar la función del gen FUS3 en la detención del ciclo celular G1 y el apareamiento.
- * Para identificar las interacciones genéticas y las vías que implican FUS3.3.
Principales métodos:
- * Análisis de los mutantes fus3-1 y fus3-2.
- * Estudios de supresión genética utilizando mutaciones nulas daf1/whi1 (CLN3) y gpa1.
- * Estudios de sobreexpresión de FUS3 en células de tipo salvaje.
Principales resultados:
- * Los mutantes Fus3 exhiben defectos en la detención de G1 tras la exposición a feromonas.
- * El defecto de detención de G1 está suprimido por una mutación nula de cln3.
- * FUS3 regula positivamente la conjugación, con una sobreexpresión que aumenta la sensibilidad a las feromonas y la ausencia que causa esterilidad.
- * Las mutaciones nulas de Fus3 suprimen las mutaciones nulas de gpa1, colocando a FUS3 en la vía de transducción de la señal.
- * La proteína FUS3 comparte homología con las conocidas quinasas (CDC28 y KSS1).
Conclusiones:
- * FUS3 es esencial para la detención de G1 y el apareamiento en la levadura.
- * FUS3 funciona dentro de la vía de transducción de señales de feromonas.
- * FUS3 actúa como un regulador positivo de la conjugación y la detención del ciclo celular.
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