ER 関連エンドソーム分裂を制御する ER 膜タンパク質の新種
Melissa J Hoyer1, Patrick J Chitwood1, Christopher C Ebmeier1
1Department of Molecular, Cellular, and Developmental Biology, University of Colorado-Boulder, Boulder, CO 80309, USA.
Cell
|September 18, 2018
まとめ
エンドプラズマ網膜 (ER) の膜接触部位は,エンドソーム分裂に不可欠である. コロニン1Cによって採用されたERタンパク質TMCC1は,このプロセスを制御し,適切な貨物の分類を行います.
科学分野:
- 細胞生物学
- 分子生物学
- 膜の密輸
背景:
- エンドプラズマ網膜 (ER) の膜接触部位 (MCS) は重要な細胞の接点である.
- これらの部位はエンドソーム分裂と 貨物分類の調節に関与する.
- これらの出来事における ERの正確な役割は,まだ完全に理解されていません.
研究 の 目的:
- エンドソーム分裂に関与するERタンパク質をMCSで特定する.
- ERがエンドソームの芽生えと荷物の分類に影響を与えるメカニズムを解明する.
- これらの部位におけるERタンパク質とアクチン調節体の関係を定義する.
主な方法:
- エンドソームの芽に相互作用する ER タンパク質を特定するために,乱雑なバイオチン・リガース戦略を使用した.
- 特定されたタンパク質の機能を評価するために,siRNAを用いた枯渇研究.
- タンパク質の局所化とエンドソームの形状を視覚化するための免疫光顕微鏡.
- コロニン1CのER募集とアクチン依存分裂における役割を調査した.
主要な成果:
- ER-endosome MCSに濃縮されるER膜タンパク質であるTMCC1を特定した.
- TMCC1の枯渇は,ERに関連したエンドソーム芽分裂とゴルギへの荷物の分類を妨げます.
- コロニン1Cは,ER-エンドソームの接触部位へのTMCC1の誘導に不可欠である.
- アクチン依存の貨物分類領域のER関連分裂には,コロニン1Cが必要である.
結論:
- TMCC1は,MCSにおけるエンドソーム分裂を調節する重要なER居住タンパク質である.
- ER- エンドソームの接触部位へのTMCC1の誘導は,コロニン1Cに依存している.
- この相互作用は,エンドソーム分裂中の貨物の分類にERが関与する規制されたメカニズムを強調しています.
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