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El papel de la polimerización de la tubulina durante el alargamiento del husillo in vitro
Cell
|April 24, 1987
Resumen
La adición de tubulina reactiva el alargamiento del huso de la anafase en las diatomeas. Este proceso implica la adición de tubulina y el deslizamiento de microtúbulos en la zona media del husillo, que requieren ATP y son sensibles al vanadato.
Área de la Ciencia:
- Biología celular Biología celular.
- Dinámica del citoesqueleto Dinámica del citoesqueleto
- El ensamblaje de microtúbulos.
Sus antecedentes:
- El alargamiento del eje anafásico es crucial para la segregación cromosómica.
- El papel de la tubulina exógena en la regulación de este proceso en sistemas aislados no se entiende completamente.
Objetivo del estudio:
- Para investigar el efecto de la tubulina exógena en el alargamiento del husillo anafásico en husillos de diatomeas aislados.
- Para aclarar el mecanismo de incorporación de tubulina y su relación con el alargamiento del husillo.
Principales métodos:
- Aislamiento de los husillos de diatomeas.
- Incubación con neurotubulina biotinilada exógena.
- Análisis microscópico de los patrones de alargamiento del husillo y de incorporación de tubulinas.
- Evaluación de la dependencia del ATP y la sensibilidad al vanadato.
Principales resultados:
- La tubulina exógena mejora significativamente el alargamiento del husillo más allá de la zona de superposición de microtúbulos.
- La tubulina se incorpora a la zona media del husillo, formando patrones distintos durante el alargamiento.
- El alargamiento del husillo y la incorporación de tubulinas de la zona media son dependientes del ATP y sensibles al vanadato, mientras que la incorporación de polos no lo es.
Conclusiones:
- La adición de tubulina a los extremos de microtúbulos en la zona de solapamiento impulsa el alargamiento del husillo.
- El deslizamiento de microtúbulos dentro de la zona media es el mecanismo principal para el alargamiento extenso del husillo.
- El proceso es un mecanismo activo y dependiente de la energía que implica la dinámica de los microtúbulos.
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