関連する実験動画
Updated: May 13, 2026
08:59
4D Imaging of Protein Aggregation in Live Cells
Published on: April 5, 2013
間違った折りたたまれたタンパク質は,2つの異なる品質管理コンパートメントの間で分割されます.
Daniel Kaganovich1, Ron Kopito, Judith Frydman
1Department of Biology and BioX Program, Stanford University, Stanford, California 94305, USA.
Nature
|August 30, 2008
まとめ
ハンチントン病やプリオン病のような神経変性疾患を引き起こす誤った折りたたまれたタンパク質は,特定の細胞区画に蓄積されます. 彼らの位置は,あらゆる場所の存在と集合に依存し,病気のメカニズムについての洞察を提供します.
科学分野:
- 細胞生物学 細胞生物学
- 神経科学は神経科学である.
- バイオケミストリー バイオケミストリー
背景:
- 細胞内アミロイドインクルージョンにおける誤った折りたたまれたタンパク質の蓄積は,神経変性疾患の特徴である.
- この蓄積は,細胞タンパク質の品質管理機構の故障によるものと考えられています.
研究 の 目的:
- ユカリオット細胞溶液における誤った折りたたまれたタンパク質インクルージョンの形成を調査する.
- 誤った折りたたまれた細胞タンパク質の封じ込めに関与する細胞内コンパートメントを特定する.
主な方法:
- イーストと哺乳類の細胞培養モデルを使用した.
- タンパク質分割におけるユビキチネーション状態とアグレゲーション状態の役割を調べました.
- ハンティングチンやプリオンタンパク質のような病気に関連したタンパク質の局所化を調査した.
主要な成果:
- 誤った折りたたまれたタンパク質の封じ込めのための2つの異なる細胞内区画を特定しました:ジクスタヌクレア区画とペリバキュオラ包摂.
- タンパク質の分割は,ユビキチン化と集積状態に依存する.
- 溶解性,ユビキチン化タンパク質は,ジクスタヌクレアコンパートメントを標的とし,集積されたタンパク質は,ペリバキュオラコンパートメントに移動します.
- 病気に関連したハンティングチンとプリオンタンパク質は,好ましくは,周水管区内に蓄積する.
結論:
- サイトゾール内の間違った折りたたまれたタンパク質の区画化を理解するための枠組みを確立しました.
- ユビキチネーションの強化により,誤った折りたたまれたタンパク質をジクスタヌクレアコンパートメントに誘導することが示された.
- 病気に関連したインクルージョンにおけるアミロイド原性タンパク質の好ましい蓄積に関する洞察を提供した.
関連する概念動画
03:00Molecular Chaperones and Protein Folding
The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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01:45Overview of Protein Sorting and Transport
Eukaryotic cells have different membrane-bound organelles with distinct protein requirements. The process by which proteins are targeted to a specific organelle is called protein sorting.
Protein sorting can be of two types: signal-based sorting and vesicle-based trafficking. In signal-based sorting, specific amino acid sequences called sorting signals target proteins to the proper location inside the cell either via gated transport or by protein translocation. In gated transport, folded...
Protein sorting can be of two types: signal-based sorting and vesicle-based trafficking. In signal-based sorting, specific amino acid sequences called sorting signals target proteins to the proper location inside the cell either via gated transport or by protein translocation. In gated transport, folded...
01:29Protein Folding Quality Check in the RER
ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
01:37The Unfolded Protein Response
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
01:32Export of Misfolded Proteins out of the ER
After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
03:00Molecular Chaperones and Protein Folding
The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
The...