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Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
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The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
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Fosforilación del sustrato CDK y ordenamiento del ciclo celular

Matthew P Swaffer1, Andrew W Jones2, Helen R Flynn3

  • 1Cell Cycle Laboratory, The Francis Crick Institute, London NW1 1AT, UK.

Cell
|December 17, 2016
PubMed
Resumen
Este resumen es generado por máquina.

Un solo complejo de cinasa dependiente de ciclina (CDK) puede ordenar temporalmente los eventos del ciclo celular mediante el control preciso de la fosforilación del sustrato. El aumento de la actividad CDK y la sensibilidad del sustrato crean umbrales distintos, asegurando una progresión adecuada de la división celular.

Palabras clave:
El CDKLa fase Sciclo celularKinasa dependiente de la ciclinaLa kinasaLa mitosisLas fosfoproteómicasFosforilación

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Área de la Ciencia:

  • Biología celular
  • Biología molecular
  • La bioquímica

Sus antecedentes:

  • La progresión del ciclo celular se basa en complejos de cinasa dependientes de la ciclina (CDK).
  • El orden temporal de la fase S y la mitosis es crucial para la división celular.
  • Los modelos anteriores sugirieron que los niveles totales de actividad de CDK, no la especificidad del sustrato, dictan el tiempo del ciclo celular.

Objetivo del estudio:

  • Investigar cómo se ordenan temporalmente los sustratos CDK durante el ciclo celular.
  • Determinar el papel de los niveles de actividad de las CDK y la sensibilidad del sustrato en la regulación del ciclo celular.
  • Para analizar los patrones de fosforilación del sustrato CDK en la levadura de fisión.

Principales métodos:

  • Análisis de sistemas basados en la fosfoproteómica de sustratos CDK en levaduras de fisión.
  • Análisis comparativo con células de tipo salvaje.
  • Medición de la actividad de las CDK y de la dinámica de fosforilación del sustrato.

Principales resultados:

  • Un solo complejo ciclina-CDK puede ordenar temporalmente la fosforilación de diferentes sustratos.
  • El aumento de la actividad CDK y la sensibilidad diferencial del sustrato crean umbrales de actividad específicos.
  • La rápida rotación de la fosforilación asegura unos umbrales de actividad específicos del sustrato para los eventos del ciclo celular.

Conclusiones:

  • Los niveles de actividad de CDK y la sensibilidad del sustrato son mecanismos clave para el ordenamiento temporal de los eventos del ciclo celular.
  • Los umbrales de especificidad y actividad del sustrato de ciclina trabajan juntos para afinar los patrones de fosforilación.
  • Este mecanismo asegura la ejecución precisa de los eventos posteriores del ciclo celular.