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Protein Complex Assembly02:41

Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Maturation of Endosomes01:28

Maturation of Endosomes

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The early endosome containing internalized molecules matures through transformations in its location, morphology, intraluminal pH, and membrane protein composition. Together, these changes result in a more acidic late endosome that contains multiple intraluminal vesicles; therefore, the late endosome is also called a multivesicular body (MVB).
Changes in location
The maturing endosome moves along microtubules from the periphery of the cell towards the perinuclear region. This movement of the...
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The Early Endosome: Endocytosis of Transferrin01:28

The Early Endosome: Endocytosis of Transferrin

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Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...
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Recycling Endosomes and Transcytosis00:58

Recycling Endosomes and Transcytosis

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The recycling endosome, also known as the endosomal recycling compartment (ERC), is a part of the slow-recycling process of the endocytic pathway. Molecules internalized through receptor-mediated endocytosis are either degraded in the lysosomes or are recycled to the plasma membrane through the fast- or slow-recycling route.
The recycling endosome is not a single organelle but an extensively tubulated network of recycling pathways. It functions in storing molecules or transporting them across...
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The Integrated Rate Law: The Dependence of Concentration on Time02:39

The Integrated Rate Law: The Dependence of Concentration on Time

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While the differential rate law relates the rate and concentrations of reactants, a second form of rate law called the integrated rate law relates concentrations of reactants and time. Integrated rate laws can be used to determine the amount of reactant or product present after a period of time or to estimate the time required for a reaction to proceed to a certain extent. For example, an integrated rate law helps determine the length of time a radioactive material must be stored for its...
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Spindle Assembly02:50

Spindle Assembly

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Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
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The Microscopy-Based Assay to Study and Analyze the Recycling Endosomes using SNARE Trafficking
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BORC複合体はBLOC-1サブユニットを統合し、エンドソーム輸送機能を多様化する

Mariana E G de Araujo1, Sascha J Amann2,3, Taras Stasyk1

  • 1Institute of Cell Biology, Biocenter, Medical University of Innsbruck, Innsbruck 6020, Austria.

Proceedings of the National Academy of Sciences of the United States of America
|January 20, 2026
PubMed
まとめ

この研究はBORCの八量体構造を明らかにし、BORCとBLOC-1がハイブリッド複合体を形成できることを示し、エンドリソソーム輸送におけるそれらの別個の役割に疑問を呈し、細胞機能のための動的アセンブリを示唆している。

キーワード:
BLOC-1BORCEARPリソソームリサイクリングエンドソーム

さらに関連する動画

In Vitro Polymerization of F-actin on Early Endosomes
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Combining Chemical Cross-linking and Mass Spectrometry of Intact Protein Complexes to Study the Architecture of Multi-subunit Protein Assemblies
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科学分野:

  • 細胞生物学
  • 分子生物学
  • 構造生物学

背景:

  • BORCおよびBLOC-1は、エンドリソソーム輸送に関与するマルチサブユニット複合体である。
  • それらの相同な起源と共有されたサブユニットは、潜在的な相互作用または高次アセンブリを示唆している。

研究 の 目的:

  • BORCの構造的アーキテクチャを解明すること。
  • BORCとBLOC-1の間のハイブリッド複合体形成の可能性を調査すること。
  • 細胞輸送におけるこれらの複合体の調節と機能的意味を理解すること。

主な方法:

  • 構造生物学技術を用いてBORCの保存された八量体アーキテクチャを決定した。
  • 架橋質量分析法を用いてヒト細胞におけるBORCモデルを検証した。
  • 生化学的および構造的分析を実施して、BORC-BLOC-1ハイブリッド複合体を同定および特徴付けた。

主要な成果:

  • BORCの保存された八量体構造を明らかにし、2つの絡み合った四量体から構成されることを示した。
  • ヒト複合体におけるBORC構造を検証し、完全性とリソソーム輸送に重要な残基を特定した。
  • EARP複合体を介したトランスフェリン受容体リサイクリングとの関連を明らかにしたBORC-BLOC-1ハイブリッド複合体の証拠を提供した。

結論:

  • BORCおよびBLOC-1は別個のエンティティではなく、動的なハイブリッド複合体を形成できる。
  • これらの複合体のモジュラーアセンブリは、エンドリソソーム輸送における機能的特化を可能にする。
  • これらの複合体の理解は、疾患メカニズムと細胞調節への洞察を提供する。