関連する実験動画
Updated: May 16, 2026

08:33
Ubiquitin Chain Analysis by Parallel Reaction Monitoring
Published on: June 17, 2020
ウビキチン鎖の形状は,相互作用するタンパク質の認識と活性を調節する
Yu Ye1, Georg Blaser, Mathew H Horrocks
1Division of Protein and Nucleic Acids Chemistry, MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, UK.
Nature
|December 4, 2012
まとめ
タンパク質のユビキチン化には,異なる形状に存在するダイナミックなユビキチン鎖が含まれます. これらの既存の状態は,相互作用するタンパク質によって認識され,生物学的調節に影響を与えます.
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.
- 構造生物学 構造生物学とは
背景:
- タンパク質認識メカニズムは,単一ドメインのタンパク質についてはよく研究されているが,ダイナミックな多ドメインシステムについてはあまり研究されていない.
- ユビキチン鎖は,さまざまなユビキチン相互作用タンパク質によって認識される重要な多領域システムです.
- ユビキチン鎖の形状は,孤立状態とタンパク質に結合した複合体間で異なっており,柔軟性または改造を示唆しています.
研究 の 目的:
- 溶液中の異なるユビキチン鎖結合の構成状態を調査する.
- ユビキチンと相互作用するタンパク質が,既存の形状を選択するか,再構成を誘発するかどうかを判断する.
- ユビキチン鎖の認識と調節における構成均衡の役割を理解する.
主な方法:
- シングル分子光共振エネルギー伝送 (smFRET) は,ディウビクイチンの形状を研究するために使用されました.
- 溶液中のライス63,ライス48,およびメット1関連ダイビキキチンの分析.
- ディウビキチンとウビキチン結合ドメイン/デウビキチナゼ (DUBs) の相互作用の調査.
主要な成果:
- Lys63-とMet1に結合したダイビキキチンは,異なる"開いた"と"閉じた"形状で存在します.
- ウビキチン結合ドメインとDUBは,これらの既存の形状を選択します.
- Lys48結合ダイビキキチンは主にコンパクトな形状を採用し,DUBはこれらの鎖を改造することができます.
- Lys48-diubiquitin インターフェースを妨害すると,ダイナミクスと DUB 活動が変化します.
結論:
- ユビキチン鎖のコンフォームバランスは,ユビキチン系における追加の規制層を提供します.
- 異なる結合型ポリユビキチンの異なる形状は,ユビキチンと相互作用するタンパク質の特異性に寄与する.
- これらの構造動態を理解することは,ユビキチン信号伝達経路の解読に不可欠です.
関連する概念動画
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.
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.
Protein Complexes with Interchangeable Parts
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
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...

