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Assembly of the Lipid Bilayer in the ER01:28

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
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After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
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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.
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LEM2フェーズ分離は,ESCRTによる核エンベロープ改革を促進する

Alexander von Appen1, Dollie LaJoie2, Isabel E Johnson1

  • 1Department of Biochemistry and Biophysics, University of California, San Francisco, CA, USA.

Nature
|June 5, 2020
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まとめ

核包膜リフォームは,LEM2タンパク質の凝縮により,核密封と適切な細胞分裂のためにESCRT複合体を活性化します. このプロセスは核の完全性を維持し DNAの損傷を防ぐために不可欠です

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科学分野:

  • 細胞生物学
  • 分子生物学
  • クロマチン・ダイナミクス

背景:

  • 細胞分裂中の染色体分離には,核封筒 (NE) の改造が不可欠である.
  • ミトーシス後の密閉核のリフォームには,輸送 (ESCRT) とトランスメブランESCRTアダプタLEM2に必要な内分体分類複合体が必要です.

研究 の 目的:

  • マイクロチューブルのLEM2凝縮がESCRTの活性化とスパインドルの解体を制御するメカニズムを解明する.
  • クロマチン結合,相分離,微小管相互作用におけるLEM2の異なるドメインの役割を調査する.

主な方法:

  • LEM2とBAF,クロマチン,微小管との相互作用を,生化学的測定を用いて調査した.
  • LEM2の相分離特性とミクロチューブルの標的を分析した.
  • LEM2の翼状ヘリックス領域によるESCRT-II/ESCRT-IIIハイブリッドタンパク質CHMP7の活性化を調べた.
  • 機能的影響を評価するために,ヒト細胞におけるLEM2媒介によるイベントの障害.

主要な成果:

  • LEM2のLEMモチーフは,染色体結合のためのBAFを結合し,その低複雑性領域 (LCD) は相分離と微小管結合を媒介する.
  • LEM2はスパインドルマイクロチューブルに凝縮し,CHMP7を活性化してコオリゴメリックリングを形成します.
  • 人間の細胞におけるLEM2機能の障害は,ESCRTのリクルート,スパインドルの分解を妨げ,核の欠陥とDNAの損傷を引き起こした.

結論:

  • LEM2は液体のような相分離を経て,CHMP7と組み合わされ,核の再組成時に膜-クロマチン-スピンドルのインターフェイスで重要な"Oリングシール"を形成します.
  • このメカニズムは,核封筒リフォームとスパインドルの解体における相分離の役割を強調する.
  • この発見は,相分離が,相間修復とクロマチン組織を含む他の核膜機能に寄与することを示唆している.