関連する実験動画
Updated: Sep 12, 2025

08:33
Ubiquitin Chain Analysis by Parallel Reaction Monitoring
Published on: June 17, 2020
3.7K
マルチステート構造決定とダイナミクス分析は,ユビキチンC末端ヒドロラーゼにおけるユニークなユビキチン認識メカニズムを明らかにする
Mayu Okada1, Yutaka Tateishi1, Eri Nojiri2
1Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 minamiosawa, Hachioji, Tokyo 192-0397, Japan.
Journal of the American Chemical Society
|August 6, 2025
まとめ
この研究では,タンパク質のダイナミクスを視覚化し,一時的な形状を機能に結びつける新しいNMR法が導入されています. この方法は酵母ウビキチンヒドロラーゼ1の大きな動きを明らかにし,酵素活性には極めて重要です.
科学分野:
- 構造生物学
- 生物化学
- バイオ物理学
背景:
- タンパク質のダイナミクスは 生物学的機能に不可欠ですが 視覚化することは困難です
- 暫定的な形状を理解することは 分子機構の解明の鍵です
研究 の 目的:
- 複数の状態のタンパク質構造を推論するための新しい NMR 方法を開発する.
- バイオマクロモレキュルの構造を正確に描写する.
- タンパク質のダイナミクスを 特定の分子機能と関連付けること
主な方法:
- 新しいNMRタンパク質構造の決定方法を使用した.
- 統合された複数のNMRデータ型:核オーバーハウザー効果 (NOE),パラ磁性NMR,残留二極結合.
- 集合構造を導出するために構造計算を使用します.
主要な成果:
- 酵母ユビキチンヒドローラゼ1 (YUH1) にこの方法を適用した.
- アクティブサイト周辺のN端 (ゲートカバー) とクロスオーバーループの有意なダイナミクスを特定した.
- N端とクロスオーバーループの相互作用が観察され,機能的関連性を示唆しています.
結論:
- この新しい NMR 方法は,タンパク質の動力学と構成組の正確な視覚化を可能にします.
- YUH1の活性部位を取り巻く大規模な動きは,効率的な酵素活性には極めて重要です.
- タンパク質のダイナミクスは,ユビキチン認識とタンパク質分解において重要な役割を果たします.
関連する概念動画
The Proteasome Structure
970
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...
970
The Proteasome
1.1K
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...
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...
1.1K
Covalently Linked Protein Regulators
7.2K
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....
7.2K
Regulated Protein Degradation
7.6K
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...
7.6K
Protein Complexes with Interchangeable Parts
2.6K
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...
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...
2.6K
Export of Misfolded Proteins out of the ER
3.9K
After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
3.9K

