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相关概念视频

Separation of Sister Chromatids02:17

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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...
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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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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...
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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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相关实验视频

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A Mass Spectrometry-Based Approach to Identify Phosphoprotein Phosphatases and their Interactors
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一个PP1-PP2A酸酶继电器控制着线粒细胞的进展.

Agnes Grallert1, Elvan Boke1, Anja Hagting2

  • 1Cell Division Group, CRUK Manchester Institute, University of Manchester, Wilmslow Road, Manchester, M20 4BX, UK.

Nature
|December 10, 2014
PubMed
概括

一个涉及蛋白质酸酶1 (PP1) 的新型线性酸酶继电器重新激活蛋白质酸酶2A (PP2A) 全酶,协调细胞分裂和退出裂变酵母. 这种保存机制调节了真核生物中PP2A-B55和PP2A-B56的活动.

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科学领域:

  • 细胞生物学 细胞生物学
  • 分子生物学分子生物学
  • 生物化学 生物化学

背景情况:

  • 细胞结构在线粒分裂过程中经历了显著的重组,主要是通过蛋白质酸化.
  • 恢复酸酶活性对于线粒体退出至关重要,在芽酵母中使用Cdc14酸酶和蛋白酸酶1 (PP1) 和蛋白酸酶2A (PP2A) 在其他参与这一过程的真核生物中.

研究的目的:

  • 阐明了裂变酵母中线性酸酶调节的机制.
  • 确定PP1,PP2A-B55,PP2A-B56在协调线粒细胞进展和退出中的作用.

主要方法:

  • 研究了PP1对PP2A全酶的顺序激活.
  • 分析了PP1 (Dis2异型) 的招募到PP2A-B55和PP2A-B56调控子单元.
  • 研究了cdk1-cyclin B对PP1的抑制及其随后的自活性.

主要成果:

  • 确定了一种线性酸酶继电器,其中PP1的活性化对于重新激活PP2A-B55和PP2A-B56都至关重要.
  • PP1被顺序地招募到PP2A-B55和PP2A-B56全酶中,顺序地激活它们.
  • 在早期的线粒分裂中,PP1活动被Cdk1-环林B抑制,并且随着环林B水平的下降而重新激活,从而启动中继.

结论:

  • PP1的重新激活启动了一个级联,首先激活PP2A-B55,然后促进PP2A-B56的重新激活.
  • 这种保存的PP1-PP2A调节机制对于协调真核细胞进化和退出至关重要.
  • 保存的PP1对接图案表明PP1在调节PP2A活动中在各种信号环境中发挥了广泛的作用.