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Quantifying Subcellular Ubiquitin-proteasome Activity in the Rodent Brain
Published on: May 21, 2019
ADP-リボシレーションによるプロテアゾームの調節
Park F Cho-Park1, Hermann Steller
1Strang Laboratory of Apoptosis and Cancer Biology, Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10021, USA.
Cell
|April 30, 2013
まとめ
ADP-リボシライゼーションは,PI31というレギュレータを改変することによって,26Sプロテアソームの活性を増強する. このプロセスにはタンキラーゼ (TNKS) が関与し,細胞生存に不可欠な26Sプロテアソームの組み立てを促進し,疾患に関連しています.
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.
- バイオケミストリー バイオケミストリー
背景:
- ユビキチン-プロテアゾーム系 (UPS) は,細胞ホメオスタシスに不可欠であり,ユビキチン化タンパク質を分解する.
- UPSの機能不全は,がんや神経変性疾患などの疾患に起因している.
- 26SプロテアゾームはUPS内の主要なプロテオリシスマシンです.
研究 の 目的:
- 26Sプロテアゾームの活性を調節するADPリボシライゼーションの役割を調査する.
- この規制メカニズムに関与する分子プレーヤーを特定する.
- プロテアソーム機能障害に関連する疾患の潜在的な治療標的を探求する.
主な方法:
- ドロソフィラとヒトの細胞系を利用した.
- コイムノプレシピテーションと結合アッセイを用いて,タンパク質とタンパク質の相互作用を特定した.
- 評価されたプロテアソームの活動と組み立て.
- タンキラーゼ (TNKS) の活性を調節するためにRNA干渉 (RNAi) と小分子阻害剤 (XAV939) を使用した.
主要な成果:
- ADP-リボシライゼーションは,ドロソフィラとヒトの細胞の両方で26Sプロテアソーム活性を促進することが判明しました.
- タンキラーゼ (TNKS) と19Sアセンブリチャペロン (dp27,dS5b) は,PI31の直接結合パートナーとして特定されました.
- TNKS媒介によるPI31のADP-リボシライゼーションは,20Sプロテアソームに対するアフィニティを低下させ,抑制を緩和した.
- PI31の改変はまた,dp27とdS5bを隔離することによって26S組立を促進しました.
結論:
- TNKSによるADP-リボシライゼーションは,26Sプロテアソームの組立と活性を調節する新しいメカニズムです.
- XAV939のような阻害剤でTNKSを標的にすると,プロテアソーム機能を調節することができます.
- この調節経路は,プロテアソーム機能障害に関連した疾患に対する潜在的な治療戦略を提供します.
関連する概念動画
The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
