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Separation of Sister Chromatids02:17

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.
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The Spindle Assembly Checkpoint02:19

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The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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Published on: March 3, 2016

La separasa regula la función del husillo de la anafase de INCENP-Aurora B a través de Cdc14

Gislene Pereira1, Elmar Schiebel

  • 1The Paterson Institute for Cancer Research, Wilmslow Road, Manchester M20 4BX, UK.

Science (New York, N.Y.)
|November 8, 2003
PubMed
Resumen

La fosfatasa Cdc14 desfosforila Sli15, dirigiendo el complejo INCENP-Aurora para hacer girar los microtúbulos durante la mitosis. Esta regulación por Cdc14 es crucial para la segregación cromosómica y la división celular.

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Área de la Ciencia:

  • Biología celular Biología celular.
  • Biología Molecular Biología Molecular
  • Genética La genética.

Sus antecedentes:

  • La proteína similar al centromero interno (INCENP) forma un complejo con las quinasas Aurora B.
  • El complejo INCENP-Aurora es vital para la segregación cromosómica, la función del huso y la citocinesis durante la mitosis.
  • El mecanismo que desencadena el cambio del complejo INCENP-Aurora de los cinetocoros a los microtúbulos del huso en la anafase sigue sin estar claro.

Objetivo del estudio:

  • Para investigar el papel de la fosfatasa Cdc14 en la regulación del complejo INCENP-Aurora de la levadura (Sli15-Ipl1).
  • Determinar cómo Cdc14 influye en la localización y función del complejo Sli15-Ipl1 durante la mitosis.

Principales métodos:

  • Investigó la interacción entre Cdc14, Sli15, e Ipl1 en la levadura.
  • Se analizó la desfosforilación de Sli15 por Cdc14.
  • Estudió la reubicación del complejo Sli15-Ipl1 tras la activación de Cdc14.

Principales resultados:

  • Cdc14 desfosforila el Sli15, un componente del complejo INCENP-Aurora de la levadura.
  • La desfosforilación por Cdc14 dirige el complejo Sli15-Ipl1 para hacer girar microtúbulos.
  • La activación mediada por separación de Cdc14 es suficiente para desencadenar la desfosforilación y reubicación de Sli15.
  • Cdc14 modula el conjunto de la zona media del husillo a través del complejo Sli15-Ipl1.

Conclusiones:

  • Cdc14 juega un papel crítico en la regulación de la localización del complejo INCENP-Aurora durante la mitosis.
  • La desfosforilación mediada por Cdc14 es un evento clave para dirigir el complejo para hacer girar microtúbulos.
  • La función de Cdc14 se extiende más allá de la salida mitótica para incluir la regulación del ensamblaje de la zona media del huso.