ABLとTMKは細胞外オキシンの共受容体である
Yongqiang Yu1, Wenxin Tang2, Wenwei Lin2
1Haixia Institute of Science and Technology, School of Future Technology, and College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, P.R. China; Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 201602, P.R. China.
Cell
|November 18, 2023
まとめ
科学者は植物で2つの新しいオクシン受容体 ABL1とABL2を発見しました これらのタンパク質は,アクシン受容体として機能し,ABP1を補完します.
科学分野:
- 植物生物学
- 分子植物学
- ホルモンの信号伝達
背景:
- 植物における細胞外オキシンの知覚は成長と発達に不可欠である.
- オクシン結合タンパク質1 (ABP1) は細胞外オクシン受容体として提案されたが,その役割は矛盾する証拠のために議論された.
- トランスメンブランキナーゼ (TMKs) は植物シグナル伝達経路において重要な役割を果たします.
研究 の 目的:
- 細胞外オクシン受容体を特定する
- オクシン受容体とTMKの相互作用を解明する.
- 植物ホルモンシグナル伝達におけるオクシン結合タンパク質の異なる重複する機能を明らかにする.
主な方法:
- タンパク質とタンパク質の相互作用を検出するための酵母2ハイブリッド測定法
- コイムノプレシピテーションは,プランタにおける相互作用を確認する.
- 遺伝子相互作用と突然変異現象の分析
- 実験室でのオクシン結合測定
主要な成果:
- 2つの新しいオキシン結合タンパク質,ABL1とABL2が植物アポプラストで特定されました.
- ABL1とABL2は,オクシン依存的な方法でTMKの細胞外領域と直接相互作用する.
- ABL1とABL2は,ABP1と比較して重複し,異なる機能を示し,遺伝的にTMKと相互作用します.
- TMK1の細胞外ドメインはオクシンと結合し,ABP1またはABL1と相乗効果を発揮する.
結論:
- ABL1とABL2は新しい細胞外オクシン受容体として機能する.
- ABL1,ABL2,ABP1は,TMKsと結合して,細胞外オクシン認識のための共受容体として作用する.
- これらの発見はオキシンのシグナル伝達と 植物発達の長年の疑問を解決します
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