p34cdc2のサイクリン活性化
M J Solomon1, M Glotzer, T H Lee
1Department of Biochemistry and Biophysics, University of California, San Francisco 94143-0448.
Cell
|November 30, 1990
まとめ
カエル卵のサイクリン蓄積は,p34cdc2の急速な活性化を誘発し,ミトーシスを開始します. INHによって調節されるこのプロセスは,細胞サイクル制御に不可欠なリン酸化と脱リン酸化のダイナミクスを含む.
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:
- 卵におけるサイクリン蓄積は,p34cdc2の活性化を促し,ミトーシスを開始する重要な調節体であるp34cdc2を活性化させます.
- この活性化プロセスは,重要なサイクリン濃度に達した後でも遅延を含む異常な運動性を表しています.
研究 の 目的:
- in vitroでp34cdc2の突然および遅れた活性化の原因となるメカニズムを調査する.
- MPF (成熟促進因子) の活性化を調節するINH (2A型タンパク質フォスファターゼ) の役割を特徴付ける.
主な方法:
- バクテリアで発現するサイクリンタンパク質とXenopusの卵エキスをin vitro実験に使用した.
- タイロシンとスレオニン残基のp34cdc2のリン酸化状態を分析した.
主要な成果:
- サイクリン濃度に関係なく,遅延期を持つp34cdc2の突然の活性化を成功裏に再現しました.
- INHが,値サイクリン濃度と遅延期間の長さを両方を調節することを実証した.
- サイクリン結合がp34cdc2のリン酸化 (タイロシンとスレオニン) に繋がり,不活性化を引き起こすことが観察されました.
結論:
- ミトーシスへの移行は,p34cdc2リン酸化の調整された変化,特にチロシンリン酸化の減少と脱リン酸化の増加を含む.
- INHは,サイクリン結合とp34cdc2リン酸化状態を調節することによって,MPF活性化の重要な調節剤として作用します.
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