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関連する概念動画

Eukaryotic Compartmentalization01:37

Eukaryotic Compartmentalization

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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
For example, lysosomes in the animal...
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Eukaryotic Compartmentalizations01:46

Eukaryotic Compartmentalizations

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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
For example, lysosomes in the animal cells...
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Eukaryotic Compartmentalization01:46

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Subcellular Fractionation01:32

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The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
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Differential centrifugation is...
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Fluid Mosaic Model01:19

Fluid Mosaic Model

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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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Distribution of Cytoplasmic Content02:33

Distribution of Cytoplasmic Content

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Cytokinesis segregates a cell’s chromosomes and organelles into its daughter cells. Organelles divide and grow prior to cell division but cannot be synthesized de novo; therefore, cells must receive at least one copy of each organelle to survive. Currently, many of the details of how the organelles are distributed are not yet fully elucidated.
Distribution of cytoplasmic determinants
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段階分離細胞体の組成制御

Salman F Banani1, Allyson M Rice1, William B Peeples1

  • 1Department of Biophysics and Howard Hughes Medical Institute, UT Southwestern Medical Center, Dallas, TX 75390, USA.

Cell
|July 5, 2016
PubMed
まとめ

科学者は,P体やPML核体 (PML NBs) のような細胞体を,エンジニアリングされたタンパク質とRNAを用いてモデル化しました. 骨組みの濃度を変化させることで 体の構成を制御でき 細胞の組織に洞察を与えることがわかりました

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科学分野:

  • 生物化学
  • 細胞生物学
  • バイオ物理学

背景:

  • P体やPML核体 (PML NBs) などの細胞体は,多価相互作用によって組織された液体のような構造である.
  • これらの細胞体の構成を統括する一般的原理は不明である.
  • これらの原理を理解することは 細胞の組織と機能を理解するために 極めて重要です

研究 の 目的:

  • 段階分離細胞体の組成を定義する一般的原理を調査する.
  • 細胞の体構成が 支架とクライアント分子によってどのように制御されているかをモデル化し理解する.
  • 細胞体の構成を 素早く調整できる可能性を 探求するためです

主な方法:

  • 多価タンパク質とRNA分子を設計して 細胞体や細胞内でモデルを作りました
  • これらのモデル体内の相分離行動とクライアントタンパク質の分割を調査した.
  • 骨格の濃度と体積の影響を分析した.
  • モデルボディと自然PMLNBとPボディの分割行動を比較した.

主要な成果:

  • エンジニアリングされた構造物分子は 低価値のクライアントタンパク質を集約した 分相分離液体体を形成した.
  • クライアントタンパク質の分割は,脚架の比率に依存して,相図の対角に鋭い切り替えを示した.
  • 細胞体の組成は,骨組みの濃度やバレンスを変化させることで,急速に切り替えられる.
  • 自然のPML NBsとP体は,PML SUMOylationとmRNAレベルと相関する類似した分割行動を示した.

結論:

  • ヘテロタイプの多価相互作用によって形成される細胞体の構成と制御を理解するための概念的枠組みが提案されました.
  • この発見は 細胞体の構成は 骨組みの分子の比率と濃度によって 動的に調節されていることを示唆している.
  • この研究は,PML NBsやPボディのような自然細胞体が,その組成をどのように維持し,制御するかについての洞察を提供します.