関連する実験動画
Updated: May 11, 2026
09:05
Cycloheximide Chase Analysis of Protein Degradation in Saccharomyces cerevisiae
Published on: April 18, 2016
暗号的プロテアゼは,プロテアソームによるデウビキチン化と分解を組み合わせる
1Department of Biochemistry, University of Iowa, 51 Newton Road, Iowa City, Iowa 52242, USA.
Nature
|September 28, 2002
まとめ
26Sプロテアソームはタンパク質を分解し,ユビキチン除去を必要とします. 19SのサブユニットであるPOH1は,タンパク質分解と細胞活性の決定的なデウビキチン化のための新しいZn(2+) 依存プロテアゼとして作用します.
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:
- 26Sプロテアソームは,ユカリオットにおける細胞内タンパク質分解の主な機構である.
- タンパク質の分解は,ユビキチン鎖の除去を必要とし,これは20Sコアへの基板転位に不可欠なプロセスである.
研究 の 目的:
- プロテアソームの分解過程におけるデウビキチネーションのメカニズムと重要性を明らかにする.
- プロテアソーム基板からウビキチンを除去する特定のサブユニットを特定する.
主な方法:
- POH1/Rpn11サブユニットのデウビキチン化における役割を調査した.
- タンパク質の分解速度に対するデウビキチン化障害の影響を in vitroで評価した.
- 酵母におけるデウビキチン化欠陥の致死性を調べた.
主要な成果:
- 酵母におけるPOH1 (酵母におけるRpn11) を19S調節複合体内の基質デウビキチネーションを担当するサブユニットとして特定した.
- ユビキチンを除去できないことが,プロテアソームの分解速度を制限することを実証しました.
- デウビキチネーションの欠陥が酵母に致命的であることを示した.
- POH1を Zn(2+) 依存プロテアゼとして特徴付け,他の既知のシステインプロテアゼデウビキチン化酵素 (DUB) と区別する.
結論:
- POH1は,分解に関連したデウビキチン化に不可欠です.
- POH1は,メタロプロテアゼデウビキチン化酵素の新種のクラスを表しています.
- POH1による効率的なデウビキチネーションは,プロテアソーマ機能と細胞生存に不可欠です.
関連する概念動画
02:18The 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...
02:58Regulated 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...
02:18The 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...
02:58Regulated 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...
01:13The 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...
01:17The 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...