セプチンは,SOCS7が媒介するNCKの核蓄積を通じて,アクチン組織と細胞サイクル停止を調節する
Brandon E Kremer1, Laura A Adang, Ian G Macara
1Department of Microbiology, University of Virginia School of Medicine, Charlottesville, VA 22908-0577, USA.
Cell
|September 7, 2007
まとめ
哺乳類のセプチンとSOCS7タンパク質は,細胞の極性およびDNA損傷反応を調節する. SOCS7によって促進されるNCKタンパク質の核蓄積は,DNA損傷後の細胞サイクル停止に不可欠です.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 哺乳類のセプチンはGTP結合タンパク質で,その機能は十分に理解されていない.
- セプチン・ノックダウン (SEPT2,6,7) は,ストレス繊維と細胞の極性を破壊する.
- セプチン機能とDNA損傷反応におけるアダプタタンパク質NCKの役割は不明である.
研究 の 目的:
- DNA損傷に対する細胞応答におけるセプチン-SOCS7-NCK軸の役割を調査する.
- NCKが細胞の極性および細胞サイクル停止に影響を与えるメカニズムを解明する.
- セプチン,SOCS7,NCK,DNAダメージカスケードとの関連を決定する.
主な方法:
- 細胞現象型に対するNCK局所化 (細胞質対核) の影響を調査した.
- SOCS7の核輸入/輸出信号を利用して,NCKの核侵入を制御した.
- DNA損傷時のアクチンとセプチンの再配置を調べた.
- 細胞サイクル停止とp53リン酸化に対するNCKの影響を評価した.
主要な成果:
- SOCS7によって媒介されるNCKの核蓄積は,観察されたセプチンノックダウン現象型を誘発する.
- SOCS7はNCKの核輸送を促進し,セプチンとNCKの両方と相互作用します.
- DNAの損傷は,NCKとSOCS7の急速な核蓄積を誘発し,アクチンとセプチンの再配置につながります.
- NCKは,DNA損傷による細胞サイクル停止とp53 Ser15のリン酸化に不可欠です.
結論:
- セプチン-SOCS7-NCK経路は,細胞の極性およびDNA損傷反応の新たな調節剤である.
- この軸は,DNAダメージカスケードにおけるATM/ATRキナーゼの下流で機能する.
- セプチン,SOCS7,NCKのシグナル伝達は相互に繋がっており,ゲノム整合性を維持するために重要である.
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