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関連する概念動画

Ribosomal RNA Synthesis02:53

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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
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A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
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関連する実験動画

Updated: Jun 15, 2025

Peering at Brain Polysomes with Atomic Force Microscopy
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NACは,新生タンパク質の処理のためのリボソームマルチ酵素複合体を導きます.

Alfred M Lentzsch1, Denis Yudin2, Martin Gamerdinger3

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA.

Nature
|August 21, 2024
PubMed
まとめ
この要約は機械生成です。

新生ポリペプチド関連複合体 (NAC) は,リボソームに酵素を組み立てることで,メチオニンの切除とアセチル化などの重要なタンパク質の改変をオーケストラします. NACは適時なコトランスレーション処理を保証し,効率的なタンパク質合成のためにN-アセチルトランスファーゼA (NatA) を活性化します.

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関連する実験動画

Last Updated: Jun 15, 2025

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Global Identification of Co-Translational Interaction Networks by Selective Ribosome Profiling
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科学分野:

  • 分子生物学
  • 生物化学
  • 細胞生物学

背景:

  • ~40%の哺乳類のタンパク質は,N端のメチオニン切除とアセチル化を受けます.
  • これらの改変は共翻訳であり,真核生物において不可欠である.
  • 変換中の酵素の相互作用と調節は不明である.

研究 の 目的:

  • コトランスレーションによるタンパク質改変における新生ポリペプチド関連複合体 (NAC) の役割を解明する.
  • NACがメチオニンアミノペプチダース (MetAP) とN-アセチルトランスフェラーゼA (NatA) とどのように相互作用するかを調査する.
  • NACとハンティングチンの酵母2ハイブリッドタンパク質K (HYPK) によるNatA活性調節を理解する.

主な方法:

  • 生化学的測定法
  • 構造生物学の研究
  • 生体内での実験

主要な成果:

  • NACはリボソームを翻訳する際にMetAP1とNatAとマルチ酵素複合体を形成する.
  • NACは MetAP1とNatAを新生タンパク質の配列処理に配置する.
  • NACはHYPKの阻害を放出し,NatAを活性化させ,コトランスレーションによるアセチル化を保証する.

結論:

  • NACは,コトランスレーション性N端メチオニンの切除とアセチル化をオーケストラするための支架として機能する.
  • リボソーム関連タンパク質処理のメカニズムモデルが提案されています.
  • NACは,真核生物における効率的で正確なコトランスレーションによるタンパク質の改変に不可欠である.