核孔複合細胞質mRNA輸出プラットフォームの構造と機能
Javier Fernandez-Martinez1, Seung Joong Kim2, Yi Shi3
1Laboratory of Cellular and Structural Biology, The Rockefeller University, New York, NY 10065, USA.
Cell
|November 15, 2016
まとめ
mRNAの輸出に不可欠なNup82複合体は,新たに発見された分子構造を持っています. この構造は,効率的なエクスポートのために,核毛孔複合体 (NPC) 上に直接mRNAリモデリング因子を配置します.
科学分野:
- 分子生物学
- 細胞生物学
- 構造生物学
背景:
- Nup82複合体は,メッセンジャーRNA (mRNA) の輸出と再構成の最終段階に不可欠である.
- この複合体は,核毛孔複合体 (NPC) の細胞質面に位置する大きな保存された集合体である.
研究 の 目的:
- ナノメートルの精度で Nup82複合体の分子構造を決定する.
- NPC内のNup82複合体とNup84複合体の相互作用を理解する.
主な方法:
- 様々な構造データの統合
- Nup82複合体の高解像度構造分析
主要な成果:
- Nup82複合体は,異なる構成を持つ2つの同一のマルチタンパク質サブユニットで構成されています.
- 14メガダルトン (MDa) のNup82-Nup84コンプレックスがNPCの外輪にドックしています.
- このアセンブリは,mRNAの輸出因子と改造装置を,NPCの中央チャンネルに直接配置します.
結論:
- Nup82-Nup84複合体の構成は,メッセンジャーリボヌクレオプロテイン (mRNP) 粒子の効率的な捕獲と再構成を容易にする.
- この取り決めにより,輸出されるmRNPは,NPCの細胞質側に到達するとすぐに処理されます.
- この発見は,mRNA輸出機械の空間的組織に関する我々の理解を深める.
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