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Updated: Aug 1, 2026

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In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones
Published on: July 25, 2019
ウビスタチンは,ユビキチン鎖を結合することによって,プロテアソーム依存的な分解を阻害します
Rati Verma1, Noel R Peters, Mariapina D'Onofrio
1Department of Biology, Howard Hughes Medical Institute (HHMI), California Institute of Technology, Pasadena, CA 91125, USA.
まとめ
研究者は,重要なタンパク質のプロテアソームの分解を阻害することによって,細胞サイクル進行を停止する新しい小分子であるウビスタチンを発見しました. これらのウビスタチンは,ユビキチン鎖相互作用を標的とし,ユビキチン-プロテアゾームシステムを破壊します. キーワード:ウビスタチン,細胞サイクル,プロテアソーム,ウビキチン-プロテアソーム系.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
背景:
- 細胞循環は,細胞分裂に不可欠な,厳格に規制されたプロセスです.
- Ubiquitin-proteasome system (UPS) は,タンパク質の分解と細胞サイクル制御において重要な役割を果たしています.
- UPSの阻害剤は,細胞サイクル進行を妨害する可能性があります.
研究 の 目的:
- 細胞サイクル機構を阻害する新しい小分子を特定する.
- 新しく発見された阻害剤の作用機構を特徴づける.
主な方法:
- クセノパス抽出物における化学遺伝子スクリーニング.
- 精製されたプロテアソームを用いたインビトロ検査.
- タンパク質の分解とユビキチン化の分析.
主要な成果:
- ウビスタチンと呼ばれる新しいクラスの阻害剤が特定されました.
- ウビスタチンは,サイクリンBタンパク質分解を阻害することによって,細胞サイクル進行を阻害します.
- ウビスタチンは,プロテアソームによるウビキチン化されたSic1の分解を防止します.
- ウビスタチンは,Lys ((48) 結合鎖のユビキチン-ユビキチン界面を標的とし,プロテアソームへの基質結合を阻害する.
結論:
- ウビスタチンは,重要なタンパク質とタンパク質の相互作用を妨害することによって,ユビキチン-プロテアソームシステムを破壊します.
- これらの発見は,UPSとセルサイクル規制を研究するための新しいツールを提供します.
- ウビスタチンは,細胞循環の調節不全を含む疾患に対する潜在的な治療戦略を表しています.
関連する概念動画
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.
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...
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 Structure
The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
The proteasome is an...
The proteasome is an...

