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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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CPK12は,アラビドプシスの細胞質へのアポプラスティックROS輸送を促進するために,エフェクタートリガーカルシウムシグナル伝達とPIP2を分解する.

Zhiyi Jia1, Weiwei Yu2, Xijie Guo1

  • 1Zhejiang Provincial Key Laboratory of Agricultural Microbiomics, Institute of Biotechnology, Zhejiang University, Hangzhou 310058, China.

Molecular plant
|September 5, 2025
PubMed
まとめ

植物免疫受容体の活性化により,カルシウムに依存するタンパク質キナーゼであるCPK12が活性酸素種 (ROS) の移動を制御し,細菌感染に対する植物防御を強化します.

キーワード:
CPK についてカルシウム信号NADPH酸化酵素植物免疫ROSの生産

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科学分野:

  • 植物免疫
  • 分子植物病原体相互作用
  • 植物におけるカルシウム信号伝達

背景:

  • 植物におけるエフェクター誘発免疫 (ETI) は,ヌクレオチド結合レシプター (NLR) に依存している.
  • NLRはカルシウム (Ca2+) 信号伝達経路を活性化しますが,Ca2+を反応性酸素種 (ROS) などの免疫反応と結びつける下流メカニズムは不明です.
  • このつながりを理解することは 植物防御戦略を解読する上で 極めて重要です

研究 の 目的:

  • NLR媒介のカルシウム信号と持続的なETI-ROS信号を結びつける分子プレーヤーを特定する.
  • 植物の防御過程におけるROSの分割を調節するカルシウム依存タンパク質キナーゼ (CPK) の役割を解明する.
  • CPK12がROSの輸送と植物耐性をどのように影響するかを調査する.

主な方法:

  • Pseudomonas syringae pvの感染時のCPK12の活性化について調査した. トマト (Pst) DC3000 (avrRpm1) について
  • CPK12の標的を特定するために,in vitroおよびin vivoのリン酸化測定を行った.
  • ROS輸送と植物耐性に対するCPK12の効果を分析した.

主要な成果:

  • CPK12は,Pst DC3000 (avrRpm1) の感染中にCa2+依存の方法で活性化されました.
  • CPK12は,プラズマ膜内にあるタンパク質であるPIP2をリン酸化し,アポプラストから細胞質へのROSの輸送を促進する.
  • CPK12活動により,Pst DC3000に対する植物耐性 (avrRpm1) が増加した.

結論:

  • CPK12は,エフェクタが誘発するカルシウム信号とROS応答の空間的調節の間の重要なリンクとして機能する.
  • 植物免疫の重要な側面であるROSの区分を制御するために,CPK12はCa2+信号を解読する.
  • この研究は,カルシウムとROSの信号を植物の防御に統合するための新しいメカニズムを明らかにしています.