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Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Nuclear Export01:42

Nuclear Export

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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
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Nuclear Protein Sorting01:34

Nuclear Protein Sorting

6.7K
Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
6.7K
Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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ESCRT-IIIは核封筒改革を統制する.

Yolanda Olmos1, Lorna Hodgson2, Judith Mantell3

  • 1Division of Cancer Studies, Section of Cell Biology and Imaging, King's College London, London SE1 1UL, UK.

Nature
|June 5, 2015
PubMed
まとめ
この要約は機械生成です。

トランスポートIII (ESCRT-III) 機械に必要なエンドソーム分類複合体は,細胞分裂中の核封筒リフォームに不可欠です. この研究は,ESCRT-IIIを明らかにしています.

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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.
  • 遺伝学 遺伝学とは

背景:

  • 核包膜 (NE) のリフォームは,テロフェーズ中の適切な細胞分裂に不可欠です.
  • このプロセスは,エンドプラズマの網膜から派生した膜によるクロマチンのコーティングと,封筒をシールするための重要な環状融合ステップを含みます.
  • 環状融合の正確なメカニズム,特にp97のAAA-ATPase複合体の関与は,ほとんど不明のままです.

研究 の 目的:

  • 核封筒リフォーム中の環状核融合段階に起因する分子機構を調査する.
  • 移転III (ESCRT-III) に必要な内分体分類複合体の役割を,ミトーシス後の核封筒密封において決定する.
  • ESCRT-III,p97複合体,および細胞分裂における膜融合イベントの関係を調査する.

主な方法:

  • 免疫光顕微鏡を用いて,ESCRT-IIIの構成要素がヒト細胞の形成核包膜にある場所を視覚化します.
  • siRNAやその他の方法を用いた枯渇研究で,核包膜リフォームのためのESCRT-IIIのコンポーネントの必要性を評価する.
  • 同免疫プレシピテーションアッセイは,ESCRT-IIIの構成要素 (CHMP2A,CHMP4Bなど) とp97複合体の構成要素 (UFD1など) の相互作用を調査するためのものです.

主要な成果:

  • ESCRT-IIIの機械は,ヒト細胞の核包膜リフォーム中に環状融合の部位に局限することが判明しました.
  • CHMP2AなどのESCRT-III構成要素の枯渇は,ミトーシス後の適切な核-サイトプラズマ分割を妨げ,その必要性を強調しました.
  • 形成NEへのCHMP2Aの局所化はCHMP4Bに依存しており,その機能はNEリフォームに不可欠であり,p97複合体のメンバーUFD1も局所化に必要である.
  • これらの発見は,細胞分裂中に膜の再構築のための保存されたメカニズムを示唆しています.

結論:

  • ESCRT-III機械は,細胞分裂中の核封筒リフォームの環状融合段階において,新しい重要な役割を果たしています.
  • この研究は,核封筒の密封と細胞運動の消去における膜融合イベントの間の機能的保存を示しています.
  • これらの発見は,細胞分裂と核組織を制御する分子機構に関する新しい洞察を提供します.