G2フェーズ中のp21-CDKフィードバックのリドックス・スイッチは,増殖細胞サイクル終了決定を制御する

Julia Vorhauser¹, Theodoros I Roumeliotis², David Coupe³

¹Division of Molecular and Cell Biology, Chester Beatty Laboratories, the Institute of Cancer Research, London SW3 6JB, UK; Cell Cycle, Biotechnology Center (BIOTEC), TU Dresden, 01307 Dresden, Germany.

Molecular cell

|August 26, 2025

まとめ

反応性酸素種 (ROS) は,S-スルフェニル化によってタンパク質を変化させ,細胞増殖に影響を与えます. この研究は,細胞周期の進行と安定性を調節するp21の重要なS-スルフェニル化部位を特定した.

科学分野:

細胞生物学
生物化学
プロテオミクス

背景:

反応性酸素種 (ROS) は,細胞の増殖と運命を左右する重要なシグナリング分子です.
システイン残留物の酸化 (S-硫フェニル化) は重要なメカニズムですが,特定のターゲットと規制は不明です.

研究の目的:

レドックスプロテオミクスを用いて,細胞サイクル調整されたS-スルフェニル化イベントを特定する.
細胞増殖の制御におけるS-スルフェニレーションの機能的役割を調査する.

主な方法:

S-スルフェニル化標的を特定するためのレドックスプロテオミクス
細胞サイクル進行中のタンパク質酸化の分析
p21 調節における S-スルフェニル化の役割を決定する機能的試験.

主要な成果:

タンパク質全体の酸化が恒常的であるにもかかわらず,システインのサブセットでダイナミックなS-スルフェニル化が確認された.
サイクリン依存キナーゼ (CDK) 阻害体であるp21に重要な酸化還元感受性システイン (C41) が発見されました.
C41の酸化がp21とCDK2/CDK4の相互作用を調節し,p21の安定性と放射線投与後の細胞増殖を制御することが示された.

結論:

ROSによるp21のS-sulfenylationは,細胞サイクル制御のための重要な規制メカニズムである.
p21のC41残基の酸化は,その安定性と機能に影響を与え,細胞の運命決定に影響を与えます.
多数のレギュレータのS-スルフェニル化による細胞サイクル進行と再酸化制御のより広範な調整を示唆する.

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