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M-Cdk Drives Transition Into Mitosis

M-Cdk Drives Transition Into Mitosis

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.
M cyclin...

M-Cdk Drives Transition Into Mitosis

M-Cdk Drives Transition Into Mitosis

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.
M cyclin...

Positive Regulator Molecules

Positive Regulator Molecules

Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.

Positive Regulator Molecules

Positive Regulator Molecules

To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.

Separation of Sister Chromatids

Separation of Sister Chromatids

At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...

Inhibition of Cdk Activity

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...

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Un modelo cuantitativo para la desfosforilación ordenada del sustrato Cdk durante la salida mitótica.

Céline Bouchoux¹, Frank Uhlmann

¹Cancer Research UK London Research Institute, Lincoln's Inn Fields Laboratories, London WC2A 3LY, UK.

|November 15, 2011

Resumen

Este resumen es generado por máquina.

La salida mitótica implica eventos ordenados. En la levadura en ciernes, los distintos tiempos de desfosforilación del sustrato Cdk revelan cómo las actividades de la fosfatasa y la quinasa controlan la progresión del ciclo celular.

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Área de la Ciencia:

Biología celular Biología celular.
Biología Molecular Biología Molecular
La bioquímica es la bioquímica.

Sus antecedentes:

La salida mitótica sigue a la separación de las cromatidas hermanas e implica la desfosforilación de numerosos sustratos por la cinasa dependiente de ciclina (Cdk).
Los mecanismos precisos que rigen el orden temporal de estos eventos de desfosforilación durante la salida mitótica siguen siendo poco conocidos.

Objetivo del estudio:

Para investigar el tiempo ordenado de la desfosforilación del sustrato de Cdk durante la salida mitótica en la levadura en ciernes.
Para dilucidar los mecanismos que establecen la secuencia temporal de los eventos durante la salida mitótica.

Principales métodos:

Experimentos in vivo que modulan las actividades de la cinasa dependiente de ciclina (Cdk) y la Cdc14 fosfatasa.
Análisis cinético in vitro de la fosforilación y desfosforilación del sustrato de Cdk.
Prueba de diferentes modelos para el ordenamiento temporal de los eventos de salida mitótica.

Principales resultados:

La desfosforilación de los sustratos de Cdk involucrados en eventos secuenciales de salida mitótica ocurre con un tiempo ordenado.
La proporción de fosfatasa a quinasa cambia gradualmente durante la salida mitótica.
Los sustratos de Cdk responden a umbrales distintos de este cambio de relación, lo que lleva a una desfosforilación ordenada.

Conclusiones:

El cambio gradual en la proporción de fosfatasa a quinasa proporciona un mecanismo cuantitativo para ordenar los eventos de salida mitótica.
Este estudio ofrece una explicación mecanicista para un modelo cuantitativo de la progresión del ciclo celular.
Los hallazgos en la levadura en ciernes proporcionan información sobre la regulación fundamental del ciclo celular.