植物ストレスとエネルギーシグナリングにおけるトランスクリプションネットワークの中心的なインテグレーター
Elena Baena-González1, Filip Rolland, Johan M Thevelein
1Department of Genetics, Harvard Medical School, Massachusetts General Hospital, Boston Massachusetts 02114, USA. baena@molbio.mgh.harvard.edu
Nature
|August 3, 2007
まとめ
植物タンパク質キナーゼKIN10とKIN11は,暗闇,砂糖,ストレス信号を結びつけ,植物の成長と生存を制御する. これらのキナーゼは糖質によって不活性化され,エネルギーシグナル伝達において重要な役割を果たします.
科学分野:
- 植物生物学 植物生物学
- 分子遺伝学 分子遺伝学
- バイオケミストリー バイオケミストリー
背景:
- 植物は,生命にとって不可欠な,太陽光エネルギーの主要な変換器です.
- 植物が暗闇,ストレス,エネルギー枯渇に適応する方法を理解することは極めて重要です.
- 現存するモデルは,様々なストレス認識とシグナル伝達経路に焦点を当てています.
研究 の 目的:
- アラビドプシス・タライアナのタンパク質キナーゼKIN10とKIN11.1の役割を調査する.
- これらのキナーゼが,環境のシグナルに反応して,トランスクリプションの再プログラミングをどのように調節するかを理解する.
- エネルギーシグナル伝達とプラント適応におけるKIN10/11の関与を明らかにする.
主な方法:
- アラビドプシス・タリアナ (Arabidopsis thaliana) の細胞とシステムのスクリーンを利用した.
- 遺伝子欠陥と過剰発現を含むKIN10とKIN11の機能分析を実施しました.
- 転写再プログラム,遺伝子ターゲティング,代謝調節を研究した.
主要な成果:
- KIN10とKIN11は,暗闇,砂糖,ストレスに反応してトランスクリプションをオーケストラ化します.
- KIN10は,分解に関与する遺伝子を標的にし,部分的にbZIP転写因子によって媒介されるアナボリズムを抑制します.
- KIN10の過剰発現は,飢餓耐性を高め,寿命を延ばした;kin10 kin11変異体は,暗闇への適応,粉の動員,および成長の障害を示した.
結論:
- KIN10/11は,ストレス,糖,発達信号を結びつけ,植物代謝,エネルギーバランス,成長,生存を調節する上で重要な役割を果たします.
- 一般的な考えに反して,植物SnRK1s (KIN10/11を含む) は砂糖によって不活性化されます.
- KIN10/11は酵母Snf1と哺乳類AMPKとエネルギーシグナル伝達において中心的な役割を果たしています.
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