植物細胞表面ペプチド受容体複合体による細胞外pH感知
Li Liu1, Wen Song2, Shijia Huang3
1Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes, Institute of Plant and Food Science, Department of Biology, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China; Max-Planck Institute for Plant Breeding Research, Cologne 50829, Germany.
Cell
|August 23, 2022
まとめ
植物ペプチド受容体複合体は細胞外pHを感知し,根の成長と免疫を調節する. pHの変化はペプチド受容体相互作用を変化させ,植物の発達と防御反応に影響します.
科学分野:
- 植物生物学
- 分子植物学
- 植物生理学
背景:
- 細胞外pHは植物生物学的過程の重要な調節因子である.
- 植物が細胞外pHを感知するメカニズムはよく理解されていません.
- pHセンシングを理解することは 植物の成長と免疫調節の解読に不可欠です
研究 の 目的:
- 細胞外pHの変化を植物がどのように認識し反応するかを調査する.
- pHセンシングにおけるペプチド受容体複合体の役割を明らかにする.
- 根のアピカルメリステム (RAM) の成長と免疫に対するpH感知の影響を理解する.
主な方法:
- RAMの細胞外pHに対するパターン誘発免疫 (PTI) の影響を調査した.
- 異なるpH条件下で根メリシステム成長因子1 (RGF1) とその受容体 (RGFRs) の相互作用を分析した.
- 異なるpHレベルでの植物エリシターペプチド (Peps) とその受容体 (PEPRs) の結合を調べた.
- 機能的なpH依存度を評価するためにRGFRとPEPRのドメイン交換を行いました.
主要な成果:
- PTIはRGF1媒介による成長に不可欠なRAMの細胞外アルカリ化を引き起こします.
- セル外アルカリゼーションは,硫黄チロシンによる酸性RGF1- RGFR相互作用を抑制する.
- 細胞外アルカリ化は,Glu/Asp経由でアルカリに依存するPep-PEPR結合を促進し,免疫を強化する.
- ドメインの交換により,RAMの成長のpH感度が変化し,受容体ドメインの役割が確認された.
結論:
- 植物ペプチド受容体複合体は細胞外pHセンサーとして作用する.
- これらの複合体による細胞外pH感知は植物成長と免疫を差異的に調節する.
- このメカニズムは 植物が環境のpH信号を 発達と防御にどのように統合するか 洞察するものです
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