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Covalently Linked Protein Regulators

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.

Regulated Protein Degradation

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...

The Proteasome

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...

The Proteasome Structure

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...

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Updated: May 31, 2026

Ubiquitin Chain Analysis by Parallel Reaction Monitoring

Ubiquitin Chain Analysis by Parallel Reaction Monitoring

Published on: June 17, 2020

ユビキチンの水分化ダイナミクスのマッピング

Nathaniel V Nucci¹, Maxim S Pometun, A Joshua Wand

¹Graduate Group in Biochemistry & Molecular Biophysics and Department of Biochemistry & Biophysics, University of Pennsylvania, 422 Curie Boulevard, Philadelphia, Pennsylvania 19104-6059, United States.

Journal of the American Chemical Society

|July 19, 2011

まとめ

溶液NMR光譜を用いてタンパク質の水分化ダイナミクスを調査すると,水分子の異なる行動が明らかになる. この研究では,タンパク質と水の相互作用を定量化し,水分化クラスタリングと認識部位での長寿命の水を明らかにしました.

科学分野:

バイオフィジックス生物物理学
構造生物学構造生物学とは
バイオケミストリーバイオケミストリー

背景:

原子レベルで水とタンパク質の相互作用を特徴づけるのは難しい.
溶液核磁気共鳴 (NMR) スペクトロスコピーは,タンパク質の水分化ダイナミクスを研究する可能性を秘めているが,人工物によって苦しんでいる.
以前の方法では,核オーバーハウザー効果を用いて,タンパク質と地表水の相互作用を定量化することが可能であった.

研究の目的:

タンパク質の水分化ダイナミクスの詳細な分析のためのNMR方法を拡張する.
水分水とタンパク質炭素結合水素との二極相互作用を調査する.
タンパク質表面の水分化ダイナミクスをマッピングする.

主な方法:

水のダイナミクスを制御するために,タンパク質をリバースミセル粒子に封じ込みます.
低粘度液体プロパンを使用して,分子方向転換時間を操作する.
ローティングフレームの核オーバーハウザー効果 (ROPE) を取得するには, (1) H を (13) C 信号に結合する.
リラクゼーション時間定数T ((1ρ) を測定する.

主要な成果:

高品質のロープデータは,リラックス時間を延長することによって得られた.

さらに関連する動画

In Vitro Analysis of E3 Ubiquitin Ligase Function

In Vitro Analysis of E3 Ubiquitin Ligase Function

Published on: May 14, 2021

Detection of Protein Ubiquitination Sites by Peptide Enrichment and Mass Spectrometry

Detection of Protein Ubiquitination Sites by Peptide Enrichment and Mass Spectrometry

Published on: March 23, 2020

関連する実験動画

Last Updated: May 31, 2026

Ubiquitin Chain Analysis by Parallel Reaction Monitoring

Ubiquitin Chain Analysis by Parallel Reaction Monitoring

Published on: June 17, 2020

In Vitro Analysis of E3 Ubiquitin Ligase Function

In Vitro Analysis of E3 Ubiquitin Ligase Function

Published on: May 14, 2021

Detection of Protein Ubiquitination Sites by Peptide Enrichment and Mass Spectrometry

Detection of Protein Ubiquitination Sites by Peptide Enrichment and Mass Spectrometry

Published on: March 23, 2020

窒素結合水素との相互作用を含む,タンパク質表面の大部分の水分化ダイナミクスをマッピングしました.

水分化ダイナミクスの幅広いスペクトルが観察され,分子表面にクラスタリングが顕著でした.

長寿命の水分補給水を持つ地域は,タンパク質結合部位と相関しています.

結論:

拡張されたNMRアプローチは,タンパク質の水分化ダイナミクスに関する詳細な洞察を提供します.
観察された水分化クラスタリングと相互作用部位での長寿命の水は,結合における溶媒エントロピーの進化的最適化を示唆する.
この方法は,タンパク質の機能と分子認識における水の役割の理解を前進させる.