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La activación de la zona media de la aurora B en la anafase produce un gradiente de fosforilación intracelular
Brian G Fuller1, Michael A Lampson, Emily A Foley
1Department of Biochemistry, University of Virginia School of Medicine, Charlottesville, Virginia 22908, USA.
Nature
|May 9, 2008
Resumen
La división celular se basa en señales espaciales. La Aurora B quinasa crea un gradiente de fosforilación en la zona media del huso, guiando la partición celular durante la anafase y la citocinesis.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología molecular La biología molecular.
- La biofísica es la biofísica.
Sus antecedentes:
- La división celular adecuada requiere una partición precisa de los contenidos celulares.
- La zona media del huso anafásico y la aurora B quinasa son cruciales para el posicionamiento del plano de división celular.
- Los mecanismos de la señalización espacial desde la zona media del huso hasta la corteza celular siguen sin estar claros.
Objetivo del estudio:
- Para investigar la dinámica espacial y temporal de la fosforilación de la quinasa B de la aurora durante la anafase.
- Para dilucidar cómo se transmite la información espacial desde la zona media del huso a la corteza celular.
- Comprender el papel de la aurora B quinasa en la organización de los microtúbulos para la división celular.
Principales métodos:
- Utilizó sensores basados en la transferencia de energía de resonancia de fluorescencia (FRET) en células HeLa vivas.
- Empleó inmunofluorescencia para analizar sustratos nativos de aurora B quinasa.
- Se realizó un análisis cuantitativo de la dinámica de fosforilación utilizando sensores dirigidos al cromosoma y al centromero.
Principales resultados:
- Los cambios de fosforilación fueron principalmente dependientes de la posición, no dependientes del tiempo, a lo largo del eje de división.
- Un gradiente de fosforilación espacial centrado en la zona media del huso se formó temprano en la anafase.
- La orientación de la quinasa Aurora B a microtúbulos específicos fue esencial para la formación de gradientes y el establecimiento de bucles de retroalimentación.
Conclusiones:
- La actividad de la quinasa Aurora B y los microtúbulos de la zona media se involucran en un bucle de retroalimentación, generando un gradiente espacial de modificaciones post-traducionales.
- Este gradiente proporciona información espacial crucial para una división celular precisa durante la anafase y la citocinesis.
- El estudio revela un nuevo mecanismo para la señalización espacial en la división celular.
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