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Updated: Jun 10, 2026

08:33
Ubiquitin Chain Analysis by Parallel Reaction Monitoring
Published on: June 17, 2020
ポリユビキチン鎖の認識メカニズム:多価結合とダイナミクスの相互作用を通じて親和性をバランスさせる
Craig J Markin1, Wei Xiao, Leo Spyracopoulos
1Department of Biochemistry, School of Molecular and Systems Medicine, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.
Journal of the American Chemical Society
|August 12, 2010
まとめ
RAP80 RAP80は,RAP80を,RAP80を,RAP80を,RAP80を,RAP80を,RAP80は,RAP80を,RAP80は,RAP80を,RAP80は,RAP80は,RAP80は,RAP80は,RAP80は,RAP80は,RAP80は,RAP80は,RAP80は,RAP80は,RAP80は,RAP80は,RAP80は,RAP80は,RAP80は,RAP80は
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:
- RAP80はDNA損傷反応シグナル伝達に不可欠です.
- タンデムユビキチン相互作用モチーフ (tUIM) を通じてK63-ポリユビキチン鎖を結合することによって,損傷部位にタンパク質を勧誘する.
- ユビキチン信号増幅メカニズムを理解することは複雑です.
研究 の 目的:
- RAP80-tUIMとポリユビキチン鎖の相互作用の分子メカニズムを解明する.
- RAP80がDNA損傷応答における信号増幅に対する強化された親和度をどのように達成するかを説明します.
主な方法:
- 溶液状態の核磁共振 (NMR) スペクトロスコーピー.溶液状態の核磁共振 (NMR) スペクトロスコーピー.
- 分子ダイナミクス (MD) シミュレーション.
- バイオ物理学的相互作用研究.
主要な成果:
- RAP80-tUIMは,ポリユビキチン鎖との単価および多価相互作用を利用して,親和性を高めます.
- ポリユビキチン鎖の長さとの親和性の増加は,より多くの結合部位によるものです.
- 弱い相互作用と速いオフレートは,これらの結合イベントの特徴です.
- 強化された親和性は,制限されたドメインの方向転換によってエントロピー的にバランスをとります.
結論:
- RAP80-tUIM結合メカニズムは,ユビキチン信号の増幅を説明する.
- 弱い相互作用と急速な動力学は,DNA損傷の焦点の一時的な性質に貢献します.
- この研究は,DNA修復におけるユビキチンシグナル伝達に関する分子洞察を提供します.
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.
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...
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...
Cooperative Allosteric Transitions
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

