管状エンドプラズマの網膜を形作る膜タンパク質の一種
Gia K Voeltz1, William A Prinz, Yoko Shibata
1Howard Hughes Medical Institute and Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA.
Cell
|February 14, 2006
まとめ
レティキュロンとDP1/Yop1pは,管状のネットワークを安定させることで,エンドプラズマ網膜 (ER) を形作る不可欠な統合膜タンパク質です. 彼らの不在は,ERの構造を混乱させ,膜形態変異における彼らの役割を強調します.
科学分野:
- 細胞生物学 細胞生物学
- メンブラン生物学 メンブラン生物学
- バイオケミストリー バイオケミストリー
背景:
- エンドプラズマ網膜 (ER) の特徴的な管状の形状は,その機能にとって極めて重要です.
- ERの管網を生成し,維持するメカニズムは完全に理解されていません.
研究 の 目的:
- ERの管状ネットワークの形成と維持の基礎となる分子機構を調査する.
- ER膜管の形成に関与する重要なタンパク質を特定する.
主な方法:
- ERネットワーク形成を研究するために,in vitroシステムを利用しました.
- 生化学的および遺伝的アプローチを使用して,レチクロンタンパク質 (Rtn4a/NogoA) とDP1/Yop1pの役割を調査しました.
- 酵母 (S. cerevisiae) と哺乳類の細胞におけるタンパク質の局所化と機能を調べました.
主要な成果:
- 統合膜タンパク質であるレチキュロン (Rtn4a/NogoA) とDP1/Yop1pは,ERネットワークの形成に必要である.
- これらのタンパク質は主に管状ERに局所されており,ERシートから除外されています.
- 網膜の過剰発現は管状の膜構造を誘発する.
- イーストにおけるレティキュロンとYop1pの同時不在は,管状ERの破壊につながります.
結論:
- レティキュロンとDP1/Yop1pは,高度に曲がったER膜管を安定させる"形態生成性"タンパク質として作用します.
- これらのタンパク質は,エンドプラズマ網膜の特徴的な管状構造を生成し,維持するために不可欠です.
関連する概念動画
Golgi Apparatus
As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are transported by microtubule-based motor proteins and fuse together to form vesicular tubular clusters, subsequently arriving at the Golgi apparatus, a eukaryotic endomembrane organelle that often has a distinctive ribbon-like appearance.The Golgi apparatus is a major sorting and dispatch station for the products of the ER. Newly arriving vesicles enter...
Golgi Apparatus
Properly folded and assembled proteins are selectively packaged into vesicles that exit the ER. Motor proteins transport these vesicles to the Golgi apparatus for adding modifications that make these proteins functional at their destination.
The Golgi apparatus is a eukaryotic organelle that has a distinctive ribbon-like appearance. It is a primary sorting and dispatch station for cargo arriving from the ER. Newly arriving vesicles enter the cis face of the Golgi, closest to the ER, and are...
The Golgi apparatus is a eukaryotic organelle that has a distinctive ribbon-like appearance. It is a primary sorting and dispatch station for cargo arriving from the ER. Newly arriving vesicles enter the cis face of the Golgi, closest to the ER, and are...
The Endoplasmic Reticulum
The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...
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The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
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In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the translocon complex.
Sec61 protein conducting channel
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the translocon complex.
The Endoplasmic Reticulum
The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...
Golgi Apparatus
Properly folded and assembled proteins are selectively packaged into vesicles that exit the ER. Motor proteins transport these vesicles to the Golgi apparatus for adding modifications that make these proteins functional at their destination.
The Golgi apparatus is a eukaryotic organelle that has a distinctive ribbon-like appearance. It is a primary sorting and dispatch station for cargo arriving from the ER. Newly arriving vesicles enter the cis face of the Golgi, closest to the ER, and are...
The Golgi apparatus is a eukaryotic organelle that has a distinctive ribbon-like appearance. It is a primary sorting and dispatch station for cargo arriving from the ER. Newly arriving vesicles enter the cis face of the Golgi, closest to the ER, and are...


