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核細胞前-60Sリボソームの組み立て経路を視覚化
Lukas Kater1, Matthias Thoms2, Clara Barrio-Garcia1
1Gene Center Munich and Center of Integrated Protein Science-Munich (CiPS-M), Department of Biochemistry, Feodor-Lynen-Str. 25, University of Munich, 81377 Munich, Germany.
Cell
|December 16, 2017
まとめ
この研究では,冷凍電子顕微鏡を用いて核細胞における60Sリボソームサブユニット組成の初期段階を明らかにした. 構造的経路を詳細に説明し,リボソームの生化に関与する重要なタンパク質複合体を特定します.
科学分野:
- 分子生物学
- 構造生物学
- 細胞生物学
背景:
- ユカリオット60Sリボソームサブユニットの生殖は,核内に発生する複雑なプロセスである.
- この重要な経路の理解を阻害する初期組み立ての中間製品に関する構造データは限られている.
研究 の 目的:
- 初期の60Sリボソームサブユニット組成の構造的経路を解明する.
- リボソームの生体生成におけるアセンブリ因子の役割を特定し,マッピングする.
主な方法:
- クリオ電子顕微鏡 (cryo-EM) を用いて,初期の60S生物生成の中間物質の構造を決定した.
- 3.3 Å から 4.5 Å の高解像度構造が得られました.
主要な成果:
- 6つの状態で明確な未成熟のrRNA構成と25の組み立て因子を特定した.
- Nsa1-Rrp1-Rpf1-Mak16モジュールは,サブユニットの溶媒側を安定させます.
- Erb1-Ytm1-Nop7複合体は複数の因子とrRNAドメインを構成する.
結論:
- 構造的なスナップショットは,主要な60Sドメインの段階的な統合と圧縮を明らかにします.
- 出口トンネルの周りの溶媒側から中央の突起に向かって進みます.
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