UBQLN2は,プロテアソームによるオートファジー独立のタンパク質集積のクリアランスを媒介する
Roland Hjerpe1, John S Bett1, Matthew J Keuss2
1Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, Davidson Building, Henry Wellcome Lab of Cell Biology, University of Glasgow, G12 8QQ Glasgow, UK; The MRC Protein Phosphorylation and Ubiquitylation Unit, The Sir James Black Centre, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, Scotland.
Cell
|August 2, 2016
まとめ
タンパク質のクリアランスは 細胞の生存に不可欠です 新しい経路では UBQLN2 と HSP70 を使用して プロテアソーム経由でタンパク質集積物を除去し,その変異が神経変性を引き起こす.
科学分野:
- 細胞生物学
- タンパク質の分解の分子機構
- 神経科学
背景:
- タンパク質のホメオスタシスは 細胞の生存に不可欠です
- 誤った折りたたみと結合したタンパク質は 毒性があります
- 26Sプロテアソームは,どこにでも存在するタンパク質を分解しますが,他の経路も存在します.
研究 の 目的:
- タンパク質集積のクリアランスにおけるタンパク質シャトル因子の役割を調査する.
- UBQLN2がタンパク質ホメオスタシスに寄与するメカニズムを解明する.
- UBQLN2の機能障害と神経変性との関係を理解する
主な方法:
- UBQLN2,HSP70,および26Sタンパク質の相互作用を調査した.
- 細胞モデルでのタンパク質集積のクリアランスを調べた.
- UBQLN2の変異がシャペロン結合と集合クリアランスに与える影響を評価した.
- UBQLN2変異を持つマウスモデルで認知障害を研究した.
主要な成果:
- UBQLN2は,HSP70-HSP110分解機構と作用し,26Sプロテアソームを通じてタンパク質の積分をクリアする.
- UBQLN2はクライアントに結合したHSP70を認識し,タンパク質の分解を容易にする.
- この核クリアランス経路はオートファギーとは異なる.
- 人間のUBQLN2変異は,チャペロン結合,集合クリアランスを低下させ,マウスの認知障害を引き起こす.
結論:
- UBQLN2は,核内のタンパク質の集積をクリアするための新しい経路を媒介する.
- このUBQLN2媒介経路の機能障害は神経変性疾患に寄与する.
- この経路をターゲットにすると 神経変性に対する治療戦略が生まれます
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