関連する実験動画
Updated: May 5, 2026

14:08
Study of Protein-protein Interactions in Autophagy Research
Published on: September 9, 2017
8.5K
オートファゴソーム形成に必要なユビキチンのようなタンパク質であるAtg8は,膜結合と半融合を媒介する
Hitoshi Nakatogawa1, Yoshinobu Ichimura, Yoshinori Ohsumi
1Department of Cell Biology, National Institute for Basic Biology, Okazaki 444-8585, Japan.
Cell
|July 17, 2007
まとめ
オートファジータンパク質Atg8は,オートファゴソーム形成の重要なステップである膜結合と半融合を促進します. Atg4によるその脂化と脱結合は,これらの重要な膜動態を調節する.
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:
- オートファジー (Autophagy) は,分解のために二重膜オートファゴソームの形成を伴う細胞過程である.
- Ubiquitinのようなタンパク質であるAtg8は,酵母における自己ファゴソーム形成に不可欠である.
- フォスファディチルエタノアミンへのAtg8結合は,ユビキチンのようなシステムによって媒介されます.
研究 の 目的:
- オートファゴソーム形成中の膜ダイナミクスにおけるAtg8の役割を調査する.
- 膜結合と融合におけるAtg8のインビトロ機能を解明する.
- Atg8の膜関連機能のインビボ関連性を決定する.
主な方法:
- Atg8とAtg4を用いたインビトロ脂化および脱結合測定法.
- その機能を評価するために,Atg8の変異分析.
- トランスミッション電子顕微鏡でオートファゴソームの構造を分析する.
主要な成果:
- Atg8は膜結合と半融合を媒介する. in vitroでは,その脂質化に依存するプロセスである.
- 解結合酵素Atg4は,Atg8の膜結合活動を可逆的に調節する.
- 変異研究により,ATG8の膜結合と半融合における役割が vivo で確認されました.
- 電子顕微鏡では,Agg8が自相ファゴソーム膜の膨張に関与していることが明らかになった.
結論:
- Atg8の脂化は,膜結合と半融合を媒介する機能に不可欠である.
- これらのAtg8の機能は,自己ファゴソームの形成と膜膨張に不可欠です.
- Atg8のようなウビキチン型タンパク質は,細胞のプロセスにおいて,機能的多用途性を示しています.
関連する概念動画
Coat Assembly and GTPases
3.5K
Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
3.5K
SNAREs and Membrane Fusion
10.4K
Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
10.4K
Vesicular Tubular Clusters
2.4K
After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...
With the help of motor proteins such...
2.4K
Autophagy
5.0K
Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
5.0K
Cotranslational Protein Translocation
8.3K
Translocation of proteins across membranes is an ancient process that occurs even in bacteria and archaebacteria. In fact, the components of the translocation machinery are still conserved between prokaryotes and eukaryotes.
Sec61 channel partners for cotranslational translocation
During cotranslational translocation, the Sec61 channel partners with the signal recognition particle (SRP), the signal recognition particle receptor (SR), and the ribosomes to transport the nascent polypeptide chain...
Sec61 channel partners for cotranslational translocation
During cotranslational translocation, the Sec61 channel partners with the signal recognition particle (SRP), the signal recognition particle receptor (SR), and the ribosomes to transport the nascent polypeptide chain...
8.3K
Tail-anchoring of Proteins in the ER Membrane
2.8K
Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
2.8K

