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アラビドプシス PBS1の分裂は,バクテリアのIII型エフェクターによって行われます
Feng Shao1, Catherine Golstein, Jules Ade
1Department of Biological Chemistry, Medical School and Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109, USA.
Science (New York, N.Y.)
|August 30, 2003
まとめ
植物疾患耐性タンパク質は,病原体耐性タンパク質を間接的に検出する. Pseudomonas syringae avirulence protein AvrPphBは,PBS1タンパク質キナーゼを分裂することによって抵抗を活性化し,酵素活性による検出を示しています.
科学分野:
- 植物病理学 植物病理学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 植物疾患耐性 (R) タンパク質は,典型的には病原体耐性 (Avr) タンパク質を認識する.
- ほとんどのAvrタンパク質の正確な生化学的機能とそのRタンパク質の活性化メカニズムは,依然としてほとんど不明です.
- RPS5とPBS1は,AvrPphB.B.を発現するPseudomonas syringae株に対するアラビドプシスの耐性にとって極めて重要です.
研究 の 目的:
- AvrPphBがRPS5媒介の植物免疫を活性化するメカニズムを解明する.
- AvrPphBが直接または間接的に植物の抵抗反応を誘発するかどうかを判断する.
主な方法:
- アラビドプシスのAvrPphBとPBS1の相互作用を調査しました.
- PBS1.1上のAvrPphBの活性を分析するために生化学的測定法を使用しました.
- RPS5媒介性疾患耐性に対するPBS1割れ方の必要性を評価した.
主要な成果:
- AvrPphBは,特にPBS1タンパク質キナーゼを分割するプロテアゼとして特定されました.
- AvrPphBによるPBS1の割れは,RPS5依存性耐性にとって不可欠であることが判明しました.
- これは,植物がタンパク質そのものよりも,AvrPphBの酵素活性を検出していることを示しています.
結論:
- 植物Rタンパク質は,酵素活動を通じて間接的に病原体の毒性因子を検出することができます.
- AvrPphBは,植物免疫シグナリングをPBS1とRPS5.5経由で活性化するために,プロテオリシスメカニズムを使用しています.
- この研究は,植物防御における病原体エフェクター認識の新しい方法を明らかにしています.
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