サイクリン依存キナーゼ基板のリン酸化におけるサイクリン特異性
1Department of Physiology, University of California, San Francisco, California 94143-2200, USA.
Nature
|March 4, 2005
まとめ
発芽酵母サイクリンClb5とClb2は,異なる基板特異性を有する. Clb5は,水害性相互作用によって初期のS相タンパク質を特にリン酸化し,Clb2-Cdk1はミトーシス標的に対してより高い活性を示している.
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.
- バイオケミストリー バイオケミストリー
背景:
- 細胞サイクル進行は,サイクリンによって活性化されたサイクリン依存キナーゼ (CDK) によって調節されます.
- 細胞サイクル制御における異なるサイクリン機能の基礎にある分子機構は,完全に理解されていません.
研究 の 目的:
- Cdk1 (Cdc28) と複合した芽生える酵母のS相サイクリンClb5とM相サイクリンClb2の基板特異性を調査する.
- CDK媒介型リン酸化における異なるサイクリン特異性の分子基礎を解明する.
主な方法:
- Clb5 と Clb2.2 を使用した150基板のCdk1リン酸化の比較分析.
- サイクリン特異性に関与する基板モチーフと相互作用インターフェースの識別.
- サイクリン置換と基板モチーフ変異を用いたin vivo検証.
主要な成果:
- 試験されたCdk1基板の約24%は,Clb2-Cdk1.1と比較して,Clb5-Cdk1によって好ましくリン酸化されました.
- Sld2,Cdc6,Orc6,Mcm3,Cdh1などの主要なS相タンパク質は,Clb5固有の標的として特定されました.
- Clb5の特異性は,生体内のリン酸化に不可欠な基質RXL/Cyモチーフとの水性パッチ相互作用に起因する.
- Clb2-Cdk1はより高い内在キナーゼ活性を示し,高特異性なくより幅広いミトス基板をリン酸化した.
結論:
- 芽生える酵母サイクリンClb5とClb2は,基板特異性を達成するために異なるメカニズムを採用しています.
- Clb5はS相タンパク質を標的にする特定の相互作用を使用し,Clb2-Cdk1の広範な活動はM相進行をサポートします.
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