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関連する概念動画

Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

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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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RNA Editing02:23

RNA Editing

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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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Anaphase Promoting Complex00:50

Anaphase Promoting Complex

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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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DNA Damage can Stall the Cell Cycle02:37

DNA Damage can Stall the Cell Cycle

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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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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Negative Regulator Molecules01:23

Negative Regulator Molecules

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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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Author Spotlight: Establishing CENP-E Knockout HeLa Cells – A Novel Approach to Study Kinesin-7 CENP-E Biology and its Inhibitors
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RNAエディティングは,過剰なシリアキナーゼを抑制する.

Dongdong Li1,2,3,4, Yufan Liu1,2,3,4, Peishan Yi1,2,3,4

  • 1Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China.

Science (New York, N.Y.)
|August 27, 2021
PubMed
まとめ

細胞は RNA 編集を用いて活性化タンパク質キナーゼを調節する. ADR-2というRNAアデノシン脱アミナーゼの変異は 超活性キナーゼによって引き起こされた 毛細胞の欠陥を修復し 新しいフィードバックメカニズムを明らかにしました

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科学分野:

  • 分子生物学
  • 遺伝学
  • 細胞生物学

背景:

  • タンパク質キナーゼの精密な調節は細胞機能にとって極めて重要です.
  • 調節不良のキナーゼ活動,特に過活性は,様々な細胞の欠陥につながる可能性があります.
  • ハイパーアクティブキナーゼの制御を制御するメカニズムは完全に理解されていません.

研究 の 目的:

  • 超活性タンパク質キナーゼを制御する制御メカニズムを調査する.
  • 構成的に活性なキナーゼに関連したフェノタイプを抑制できる遺伝的要因を特定する.
  • キナーゼ調節におけるRNA編集の役割を解明する.

主な方法:

  • 構成的に活性なミトゲン活性化タンパク質キナーゼDYF-5 (DYF-5CA) の生成
  • 遺伝子抑制スクリーンを利用して 救助変異を特定する
  • 感染した動物のRNA転写,RNA編集,mRNAスプライシング,およびタンパク質翻訳を分析する.

主要な成果:

  • ADR-2 (RNAアデノシンデアミナーゼ) の変異は,DYF-5CAによって引き起こされる毛の欠陥を救出しました.
  • DYF-5CAは反意味RNAの異常転写を誘導し,DYF-5CAmRNAと二重鎖RNAを形成した.
  • ADR-2はDYF-5CA mRNAを外側で編集し,スプライシングを阻害し,トランスレーションを阻害し,mRNAの崩壊を引き起こした.
  • このRNA編集依存フィードバック調節はキナーゼ過活性に依存し,他のシリアルキナーゼ (NEKL-4/NEK10およびDYF-18/CCRK) にも観察された.

結論:

  • 過剰活性キナーゼは,RNA編集に依存するフィードバックメカニズムによって調節することができます.
  • ADR-2は,mRNA編集を通じてキナーゼ過活性を抑制する上で重要な役割を果たします.
  • RNA編集を含むこの調節経路は,シリアキナーゼを制御する広範なメカニズムを表しています.