FUSの折りたたみRRMドメインをモデルCAPRIN1コンデンサに分割する原子解像度相互作用
Rashik Ahmed1,2,3,4, Jeffrey P Bonin1,2,3, Julie D Forman-Kay3,4
1Department of Molecular Genetics, University of Toronto, Toronto, ON M5S 1A8, Canada.
Journal of the American Chemical Society
|August 26, 2025
まとめ
この研究では,折りたたまれたFUSRNA認識モチーフ (RRM) タンパク質が,生物分子凝縮物内のCAPRIN1脚架タンパク質に結合する方法を明らかにしました. これらの相互作用は選択的クライアント濃縮を誘導し,CAPRIN1のリン酸化によって破壊される.
科学分野:
- 生物化学
- 分子生物学
- 構造生物学
背景:
- 生物分子凝縮物は 分子を選択的に集約することで 細胞機能を調節します
- クライアントパーティショニングを理解するには,折り畳まれた状態と開いた状態の両方のクライアント状態との相互作用を研究する必要があります.
- FUSRNA認識モチーフ (RRM) はクライアントタンパク質であり,CAPRIN1は凝縮物形成に関与する支架タンパク質である.
研究 の 目的:
- 段階分離中の折りたたまれたFUS RRMとCAPRIN1の間の原子レベルの相互作用を調査する.
- これらの相互作用が,CAPRIN1凝縮物におけるFUS RRMの選択的濃縮をどのように媒介するかを決定する.
- CAPRIN1の翻訳後の変更がクライアント分割に与える影響を調査する.
主な方法:
- [1H-15N]-HSQC,分子間核オーバーハウザー効果 (NOE),およびパラマグネティックリラクゼーション強化 (PRE) を含む溶液核磁気共振 (NMR) スペクトロスコーピー.
- 化学的なシフトの乱れ分析で,相互作用の場所をマップする.
- 40°CのCAPRIN1コンデンサートにおけるFUS RRM分割を調査する.
主要な成果:
- 40 °Cでは,FUS RRMの約40%がCAPRIN1凝縮物の中に折りたたまれ,高解像度のNMR研究が可能です.
- CAPRIN1の芳香とアルギニン豊富な領域に結合するFUS RRMの特定の相互作用表面を特定した.
- FUS RRMはコンデンサートで30倍濃縮され,エスカフォルト-エスカフォルトとエスカフォルト-クライアント相互作用の結合部位が重なり合っていた.
- CAPRIN1のチロシンリン酸化は,FUS RRM結合を有意に破壊し,分割を100倍以上減少させた.
結論:
- 折りたたまれたFUS RRMは,CAPRIN1と特定の異型相互作用を行い,その選択的分割をバイオ分子凝縮物へと誘導する.
- 脚本-クライアントと脚本-脚本認識は,共通の相互作用インターフェースを共有し,コンデンサットアセンブリのための統一されたメカニズムを示唆します.
- CAPRIN1のチロシンリン酸化のような翻訳後の改変は,クライアントの相互作用を調節することによって,凝縮物組成の重要な調節体として作用する.
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