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Separation of Sister Chromatids02:17

Separation of Sister Chromatids

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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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A Mass Spectrometry-Based Approach to Identify Phosphoprotein Phosphatases and their Interactors
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PP1-PP2Aのフォスファターゼリレーがミトスの進行を制御する.

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
まとめ

タンパク質フォスファタゼ1 (PP1) を含む新しいミト酸フォスファタゼリレーは,タンパク質フォスファタゼ2A (PP2A) ホロ酵素を再活性化し,細胞分裂を調整し,分裂酵母で脱出します. この保存されたメカニズムは,真核生物の間でPP2A-B55とPP2A-B56の活動を調節する.

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Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols
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科学分野:

  • 細胞生物学 細胞生物学
  • 分子生物学は分子生物学である.
  • バイオケミストリー バイオケミストリー

背景:

  • 細胞構造は,ミトーシス過程で,主にタンパク質のリン酸化によって,重要な再編成を経験します.
  • 発芽酵母におけるCdc14フォスファタゼと,このプロセスに関与している他の真核生物におけるタンパク質フォスファタゼ1 (PP1) およびタンパク質フォスファタゼ2A (PP2A) のように,フォスファタゼ活性回復はミトの脱出に不可欠である.

研究 の 目的:

  • 分裂酵母におけるミトーシス・フォスファターゼ調節のメカニズムを解明する.
  • PP1,PP2A-B55,PP2A-B56がミトスの進行と脱出を調整する役割を特定する.

主な方法:

  • PP1によるPP2Aホロ酵素の配列活性化を調査した.
  • PP1 (Dis2イソフォーム) のPP2A-B55およびPP2A-B56規制サブユニットへのリクルートメントを分析した.
  • Cdk1-サイクリンBによるPP1の抑制とその後の自己活性化を研究した.

主要な成果:

  • PP1の活性化がPP2A-B55とPP2A-B56の両方の活性化に不可欠であるミト酸リン酸塩酵素リレーが特定されました.
  • PP1は,PP2A-B55およびPP2A-B56ホロ酵素に順番に誘導され,順番に活性化されます.
  • PP1の活動は,初期ミトーシスにおけるCdk1-サイクリンBによって抑制され,サイクリンBレベルが低下すると再活性化され,リレーが開始されます.

結論:

  • PP1の再活性化により,PP2A-B55が最初に活性化され,PP2A-B56の再活性化が促進されます.
  • この保存されたPP1-PP2Aの規制メカニズムは,真核生物におけるミトの進行と脱出の調整に不可欠である.
  • 保存されたPP1のドッキングモチーフは,様々なシグナル伝達文脈でPP2Aの活動を調節するPP1の広範な役割を示唆しています.