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Efectos in vitro en la dinámica de los microtúbulos de la quinasa MAP activada por fase de Xenopus M purificada
Y Gotoh1, E Nishida, S Matsuda
1Department of Biophysics and Biochemistry, Faculty of Science, University of Tokyo, Japan.
Nature
|January 17, 1991
Resumen
La proteína quinasa activada por mitógeno (MAPK) se activa durante la fase M, controlando las transiciones del ciclo celular. La adición de MAPK activado a los extractos celulares desencadena la reorganización de los microtúbulos, crucial para la división celular.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- La bioquímica es la bioquímica.
Sus antecedentes:
- La proteína quinasa activada por mitógeno (MAPK) es una serina/treonina quinasa involucrada en la transducción de señales mitogénicas.
- La activación de la quinasa y la fosforilación son fundamentales para la reorganización celular durante el ciclo celular, particularmente la transición de la interfase a la mitosis.
- La quinasa p34cdc2 regula la transición interfase-metafase de las matrices de microtúbulos y la fase G2-M del ciclo celular.
Objetivo del estudio:
- Para investigar el papel de la MAP quinasa en la regulación del ciclo celular y la dinámica de los microtúbulos.
- Determinar si la quinasa MAP activada por la fase M puede inducir la transición interfase-metafase de las matrices de microtúbulos.
Principales métodos:
- Ensayos de fosforilación y activación de una cinasa de Xenopus relacionada con la cinasa MAP de mamíferos durante la fase M.
- Experimentos in vitro añadiendo Xenopus purificado o cinasa MAP de mamíferos a extractos de interfase.
Principales resultados:
- Una quinasa de Xenopus, homóloga a la quinasa MAP de los mamíferos, es fosforilada y activada durante la fase M de los ciclos celular tanto meiotico como mitótico.
- La adición de kinasa MAP activada por la fase M (tanto de Xenopus como de mamíferos) a extractos de interfase in vitro indujo la transición interfase-metafase de las matrices de microtúbulos.
Conclusiones:
- La activación de la MAP quinasa durante la fase M juega un papel importante en la regulación de la progresión del ciclo celular.
- La quinasa MAP activada puede influir directamente en la organización de los microtúbulos, lo que sugiere una función clave en la reorganización celular requerida para la mitosis.
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