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受容体媒介選択的オートファギーは,エンドプラズマの網膜と核を分解する
Keisuke Mochida1, Yu Oikawa2, Yayoi Kimura3
1Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama 226-8503, Japan.
Nature
|June 5, 2015
まとめ
研究者らは,酵母におけるエンドプラズマ網膜 (ER) と核の選択的自を可能にする新しいタンパク質であるAtg39とAtg40を特定した. このプロセスは,細胞のホメオスタシスとストレス下での生存に不可欠です.
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.
- オートファジー研究 オートファジー研究
背景:
- セレクティブ・オートファギーは細胞機能を調節し,ヒトの病気に関連しています.
- 受容体タンパク質は,自己ファゴソームを通して特定の細胞成分の分解を媒介する.
- オーガネルのホメオスタシス,特にERと核における選択的オートファギーの役割は完全に理解されていません.
研究 の 目的:
- エンドプラズマの網膜 (ER) と核の選択的自己殺菌経路を調査する.
- ERと核オートファギに関与する新しい受容体タンパク質を特定する.
- ER-phagyとnucleophagyのメカニズムと生理学的関連性を明らかにする.
主な方法:
- 酵母 Saccharomyces cerevisiaeをモデル生物として利用した.
- 新種のオートファジー受容体タンパク質であるAtg39とAtg40を特定し,特徴づけました.
- Atg39とAtg40の局所化と機能を調査し,ERと核のオートファージクセストレーションを行った.
主要な成果:
- Atg39とAtg40が,それぞれ核の選択的自己死とERの特定の受容体として発見されました.
- Atg39は,周核ER経由で核の自相相連鎖を媒介する.
- Atg40は,皮質と細胞プラズマのERサブドメインの自相連鎖を媒介する.
結論:
- 核のATG39に依存したオートファギーは,窒素欠乏時に酵母菌の生存に不可欠である.
- Atg40は,哺乳類のER-phagy受容体FAM134Bの酵母正体である可能性が高い.
- これらの発見は,ER-phagyとnucleophagyのメカニズムと役割に関する基本的な洞察を生物全体に提供します.
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