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Distinto núcleo y población del cuerpo del polo del huso de ciclina-cdc2 en la levadura de fisión
C E Alfa1, B Ducommun, D Beach
1Department of Biology, University College London, UK.
Nature
|October 18, 1990
Resumen
Este estudio revela dos poblaciones distintas de ciclinas nucleares en la levadura de fisión, una en los polos del huso. Estas ciclinas regulan la progresión del ciclo celular y requieren la función de los microtúbulos para su activación.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- Las ciclinas son reguladores clave del ciclo celular eucariota, actuando como subunidades de la proteína quinasa cdc2.
- La levadura de fisión Schizosaccharomyces pombe utiliza una ciclina de tipo B, codificada por el gen cdc13, que se localiza en el núcleo.
Objetivo del estudio:
- Investigar la distribución espacial y la función de la ciclina cdc13 en el núcleo de S. pombe.
- Para aclarar el papel del complejo cdc2-ciclina en la formación del huso mitótico y la activación de cdc2.
Principales métodos:
- Análisis microscópico de la localización de la ciclina cdc13 en S. pombe.
- Tratamiento con el fármaco antimicrotubular tiabendazol para evaluar los efectos sobre la degradación de la ciclina y la activación del cdc2.
Principales resultados:
- Se identificaron dos poblaciones distintas de ciclina cdc13 en el núcleo de S. pombe.
- Se encontró una población de ciclinas asociada con los polos mitóticos del huso.
- Ambas poblaciones de ciclina se colocalizan con p34cdc2, el producto del gen cdc2.
- El tratamiento con tiabendazol inhibió la degradación de la ciclina y bloqueó la activación de cdc2.
Conclusiones:
- El complejo cdc2-ciclina juega un papel crucial en el inicio de la formación del huso mitótico.
- La función adecuada de los microtúbulos mitóticos es esencial para la activación de cdc2.
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