カルシウム浸透性チャンネルOSCA1.3は植物口腔免疫を調節する
Kathrin Thor1, Shushu Jiang1,2, Erwan Michard3
1The Sainsbury Laboratory, University of East Anglia, Norwich Research Park, Norwich, UK.
Nature
|August 27, 2020
まとめ
植物免疫信号は,カルシウム (Ca2+) 経路のOSCA1.3経由で口腔閉塞を誘発する. このチャンネル
科学分野:
- 植物生物学
- 分子植物病理学
- イオンチャネル生理学
背景:
- 植物における口腔閉塞は 生物学的および非生物学的ストレスに対する 重要な反応である.
- この反応にはカルシウムイオン (Ca2+) の流入が不可欠ですが,その特定の経路は不明でした.
- これらの経路を理解することは 植物の免疫とストレス反応に不可欠です
研究 の 目的:
- 植物免疫シグナル伝達過程で口腔閉塞の原因となるカルシウムチャネルを特定する.
- 病原体関連分子パターン (PAMPs) によるチャネル活性化のメカニズムを解明する.
主な方法:
- アラビドプシス・タリアナをモデル生物として利用した.
- タンパク質の相互作用とリン酸化部位を特定するために生化学的測定と定量的なリン酸プロテオミクスを使用した.
- 経路の機能と調節を確認するために遺伝子と電気生理学的実験を行った.
主要な成果:
- 免疫シグナル伝達中の口腔閉塞を制御するCa2+浸透性チャンネルとしてOSCA1. 3を特定した.
- キナーゼBIK1がPAMPの知覚時にOSCA1. 3をリン酸化し,その活性を増強することを実証した.
- OSCA1. 3による口腔閉塞は免疫信号伝達に特異的であり,アブシシス酸反応には関与していないことが示された.
結論:
- OSCA1. 3は,植物免疫反応の重要なCa2+経路であり,口腔閉塞につながる.
- BIK1媒介のリン酸化は,OSCA1. 3の活性化のための重要な調節メカニズムである.
- この研究は,異なる植物ストレス反応のためのCa2+シグナル伝達経路の特異性を明らかにしています.
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