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La proteólisis Cut2 es requerida para la separación de las cromatidas hermanas en la levadura de fisión
H Funabiki1, H Yamano, K Kumada
1Department of Biophysics, Faculty of Science, Kyoto University, Japan.
Nature
|May 30, 1996
Resumen
La proteólisis específica de la anafase de la proteína Cut2 es esencial para la separación de las cromatidas hermanas en la levadura de fisión. Su degradación requiere la región amino-terminal y Cut9, un componente del complejo promotor de la anafase (APC).
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- Las ciclinas mitóticas se someten a proteólisis en la transición metafase-anafase.
- La degradación de la ciclina no es esencial para la separación de las cromatidas hermanas.
- Es probable que se requiera la proteólisis de otras proteínas para este proceso.
Objetivo del estudio:
- Para investigar la proteólisis específica de la anafase de la proteína Cut2 de Schizosaccharomyces pombe.
- Determinar el papel de la proteólisis Cut2 en la separación de las cromatidas hermanas.
Principales métodos:
- Estudió la localización y degradación de Cut2 durante el ciclo celular.
- Investigó el requisito de la región amino-terminal de Cut2 y Cut9 para su degradación.
- Se examinó el efecto del Cut2 no degradable en la progresión del ciclo celular y la separación de las cromatidas hermanas.
- Utilizó técnicas de injerto de proteínas para demostrar la necesidad de una proteólisis Cut2 regulada.
Principales resultados:
- La proteína Cut2 se degrada específicamente durante la anafase.
- La degradación de Cut2 requiere su región amino-terminal y el componente del complejo promotor de anafase (APC) Cut9.
- La expresión de Cut2 no degradable inhibe la separación de las cromatidas hermanas sin afectar la progresión del ciclo celular.
- El injerto del extremo N de la ciclina B en el truncado Cut2 resuelve el defecto de separación.
Conclusiones:
- La proteólisis regulada de Cut2 es esencial para la separación de las cromatidas hermanas en la levadura de fisión.
- Cut2 es un sustrato clave para el APC, mediando un paso crítico en la división celular.
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