核孔複合体の構造を安定させる
Evgeny Onischenko1, Jeffrey H Tang1, Kasper R Andersen2
1Department of Biology, Institute of Biochemistry, Eidgenössische Technische Hochschule Zürich, Otto-Stern-Weg 3, CH-8093 Zurich, Switzerland.
Cell
|October 17, 2017
まとめ
酵母核孔複合体 (NPC) のフェニララニン-グリシン (FG) リピートは,輸送を調節するだけでなく,基板核ポリン (Nups) と結合し,NPCの組み立てを支援します. これは,NPCアーキテクチャにおけるFGリピートの新しい構造的役割を明らかにします.
科学分野:
- 細胞生物学
- 分子生物学
- 構造生物学
背景:
- 核孔複合体 (NPC) は,核と細胞質の間の分子輸送を制御する大きなタンパク質チャネルである.
- 多くのヌクレオポリン (Nups) はフェニララニン・グリシン (FG) に富んだ繰り返しを特徴とし,核輸送のための選択的障壁を形成する.
- 輸送規制を超えたFGの正確な構造と組み立ての役割は完全に理解されていません.
研究 の 目的:
- イーストのNPC構造と生体生成におけるFGリピートの追加の機能を調査する.
- GLFGを含むFGの繰り返しとエスカフォードNUPの相互作用を探求する.
- NPC アセンブリにおける FG リピートの役割を明らかにする.
主な方法:
- GLFGのリピートとエスカフォードNupsの相互作用をテストするインビトロ結合測定法.
- NPCのターゲティング決定因子としてのFGの繰り返しの役割を評価するインビボ試験.
- Nup116とNup188の機能に焦点を当てたNPCの組立ステップの分析
主要な成果:
- GLFGを含むFGリピートは,複数のエスカフォードNupsをインビトロで直接結合することが判明しました.
- これらのFGの繰り返しは,NPCの標的化 in vivoの決定因子として機能する.
- Nup116のGLFGリピートは,Nup188との機能的な冗長性を示し,NPCエスカフォールドの相互作用を安定させ,後期アセンブリに不可欠である.
結論:
- FGのリピートは,NPCのサブコンプレックスをつなぐ上で予期せぬ構造的な役割を果たし, "Velcro"のように作用します.
- この発見はNPCの建築と生体形成の 現在のモデルに 新しい層を追加します
- 核輸送とNPCの整合性を維持するFGリピートの多面的な役割を強調しています.
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