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PLETHORA-auxinトランスクリプションモジュールは,MAP65とCLASPを通して細胞分裂平面の回転を制御します
Pankaj Dhonukshe1, Daan A Weits, Alfredo Cruz-Ramirez
1Department of Biology, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands. p.b.dhonukshe@uu.nl
Cell
|April 17, 2012
まとめ
植物幹細胞の分裂方向性は,オクシンシグナル伝達を活性化するPLETHORA転写因子によって制御されます. これはMAP65タンパク質を上位に調節し,細胞分裂平面のスイッチを正確にするためにマイクロチューブルをリオリエンテーションします.
科学分野:
- 植物生物学 植物生物学
- 細胞力学 細胞力学
- 発達生物学 発達生物学とは
背景:
- オリエンテッド・セル・ディビジョンは植物の発達に不可欠ですが,その調節は十分に理解されていません.
- 植物における幹細胞の調節は,細胞分裂平面の正確な制御に依存しています.
研究 の 目的:
- アラビドプシスの幹細胞における指向細胞分裂を制御する分子機構の解明.
- 分割平面の方向転換に関与する上流の要因と下流の細胞構成要素を特定する.
主な方法:
- PLETHORA転写因子とオクシンシグナル伝達の役割を調査した.
- 微小管関連MAP65タンパク質の発現と機能を分析した.
- マイクロチューブル細胞皮質の相互作用媒介体であるCLASPの関与を調べました.
- 分割平面のスイッチングをモデル化するために計算シミュレーションを利用した.
主要な成果:
- PLETHORA転写因子はオクシンシグナル伝達を活性化し,MAP65タンパク質のアップレギュレーションにつながります.
- MAP65のアップレギュレーションは,CLASPを介して皮質のマイクロチューブル配列をリオリエンテーションします.
- CLASPの局所化はマイクロチューブルとMAP65.5に依存しています.
- シミュレーションでは,自己組織化マイクロチューブルの性質と,CLASPバイアス駆動90°分割平面スイッチが示されています.
結論:
- 転写因子媒介によるオクシン信号の活性化は,植物における細胞分裂の方向性を制御する.
- MAP65-CLASP-マイクロチューブル経路は,形成細胞分裂平面を調節する鍵となる.
- この研究は,転写因子から,指向的な細胞分裂のための細胞機械への規制のカスケードを示しています.
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