関連する実験動画
Updated: Jul 7, 2026

11:36
In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones
Published on: July 25, 2019
ユビキチンのようなシステムは,タンパク質の脂化を媒介する
Y Ichimura1, T Kirisako, T Takao
1Department of Cell Biology, National Institute for Basic Biology, Okazaki, Japan.
Nature
|December 2, 2000
まとめ
オートファギーは,Apg8 (オートファギーの関連タンパク質8) とフォスファディルエタノアミンとの結合を含む新しいタンパク質脂化プロセスを利用します. このユビキチネーションのような経路は,酵母オートファジー中の膜動態にとって極めて重要です.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- オートファギーは,ライソソームを通してタンパク質と臓器細胞を分解する重要な細胞プロセスです.
- Apg8 (オートファギー関連タンパク質8) は,酵母におけるオートファジーに不可欠である.
- Apg8は,Apg4プロテアゼによってC端末処理され,膜に結合した形になります.
研究 の 目的:
- Apg8変異のメカニズムとオートファジーにおけるその役割を解明する.
- Apg8が膜に結合する経路を特定する.
- 細胞膜ダイナミクスにおけるApg8脂質化の機能を調査する.
主な方法:
- タンパク質の結合を研究するための生化学的分析.
- E1およびE2酵素を含むユビキチン化型の経路の分析.
- Apg8の修正におけるApg7とApg3の役割を調査する.
主要な成果:
- Apg8は,アミド結合を通じて,フォスファディチルエタノアミンと共振的に結合しています.
- この脂化は,Apg7とApg3.3を含むユビキチネーションのようなシステムによって媒介されます.
- Apg7はApg12とApg8の両方を活性化し,特定のE2酵素に誘導する.
結論:
- Apg8のための新しいタンパク質脂化メカニズムが特定されました.
- このApg8-フォスファディテイルエタノアミン結合は,オートファギーの膜動力学にとって不可欠である.
- ユビキチネーションのようなシステムは,オートファギーの調節に重要な役割を果たします.
関連する概念動画
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.
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...
Lipids as Anchors
In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains the...
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains the...
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.
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...
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...

