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バイオゲネシス因子 Rei1 の挿入は,60S 成熟時にリボソームトンネルを検知する
Basil Johannes Greber1, Stefan Gerhardy2, Alexander Leitner3
1Institute of Molecular Biology and Biophysics, Department of Biology, ETH Zurich, CH-8093 Zurich, Switzerland.
Cell
|December 29, 2015
まとめ
ユカリオット60Sリボソームサブユニットの最終的な成熟には,Rei1,Arx1,Alb1のような重要な要因が含まれています. 精密な相互作用は,リボソームの機能と組み立てに不可欠です.
科学分野:
- 分子生物学
- 構造生物学
- 細胞生物学
背景:
- リボソームの生殖は 核細胞のタンパク質合成に不可欠で 何百もの組み立て因子が必要である.
- 60S リボソームサブユニット成熟の最終段階は,校正と因子放出を含む細胞質で起こります.
研究 の 目的:
- 60Sサブユニットの細胞質成熟の構造的基礎を決定する.
- この過程における生物生成因子Rei1,Arx1,Alb1の役割を明らかにする.
主な方法:
- 酵母60Sサブユニットの構造をRei1,Arx1,Alb1と複合的に決定するために,冷凍電子顕微鏡 (冷凍EM) を用いた.
- 観察された相互作用の機能的有意性を検証するために,遺伝的および生化学的測定法を使用した.
主要な成果:
- クリオ-EM構造は,Alb1,Arx1,Rei1と60Sサブユニットの複雑な相互作用を 3.4 Åの解像度で明らかにした.
- リボソームポリペプチド脱出トンネルの整合性を維持するメカニズムが特定されました.
- Rei1のC末端領域はリボソームトンネルに深く挿入され,広範囲の接触を形成することが判明した.
結論:
- この構造は,リボソーム生物生成因子が60Sサブユニットの適切な形成をどのように保証するかについての洞察を提供します.
- Rei1のC端末の挿入は,その後の60S成熟段階において極めて重要です.
- Arx1はリボソームトンネルの出口周辺のタンパク質を検出する役割を果たします.
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