Bub2/Bfa1 GAP複合体の規制は,Cdc5と細胞サイクルチェックポイントによるものです
1Verna and Mars McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030, USA.
Cell
|December 6, 2001
まとめ
ポーロ/Cdc5キナーゼはBfa1/Bub2をアンタゴニズしてミトーシス脱出を促進する. 細胞サイクルチェックポイントはBfa1のリン酸化を調節し,DNAの損傷が発生したときにミトスの停止を保証します.
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:
- Tem1 GTPアゼは,信号伝導経路経由でミトスの脱出を開始する.
- Bfa1/Bub2複合体は,細胞サイクルの大部分を通してTem1機能に敵対する.
- Bfa1/Bub2複合体の調節は完全に理解されていません.
研究 の 目的:
- Bfa1/Bub2複合体のアップストリームレギュレータを調査する.
- Bfa1/Bub2が細胞サイクルチェックポイントによってどのように制御されるかを明らかにする.
- ミトスの脱出ネットワークにおけるPolo/Cdc5キナーゼの役割を理解する.
主な方法:
- ポロ/Cdc5キナーゼとBfa1/Bub2.2の相互作用を調査しました.
- Bfa1のリン酸化に対するCdc5の効果を分析した.
- 試験されたBfa1の調節は,スピンドルアセンブリとスピンドル向きのチェックポイントによるものです.
- Rad53とDun1.1によるBfa1変異に対するDNA損傷の影響を研究した.
主要な成果:
- ポロ/Cdc5キナーゼはBfa1をリン酸化し,その機能を阻害し,ミトスの退去を促進する.
- スピンドル・アセンブリとスピンドル・オリエンテーション・チェックポイントはBfa1のリン酸化を阻害する.
- DNA損傷は,阻害性リン酸化から独立して,Bfa1のRad53-およびDun1-依存の改変を誘導する.
- Cdc5とチェックポイントによるBfa1の調節は,ミトスの停止を確実にする上で極めて重要です.
結論:
- ポロ/Cdc5キナーゼは,ミトスの脱出経路におけるBfa1/Bub2のアップストリームレギュレータである.
- Bfa1のリン酸化は,細胞周期のチェックポイントとDNA損傷によって差異的に調節されます.
- 複数の経路によるBfa1の改変は,適切なミトの停止を確実にするための重要なメカニズムです.
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