uORFでコードされた移動性ペプチドは,全身の口腔免疫を刺激する
Changzhen Liu1, Qiangsheng Yu1, Yunfan Jin2
1State Key Laboratory of Green Biomanufacturing, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China.
Cell
|January 28, 2026
まとめ
植物は,病原体に対して防御するために,全身的口腔免疫 (SSIM) を利用します. 新種のペプチド,上流オープンリーディングフレーム (uORF) -エンコードされた全身性ストマト免疫導体 (USIC) は,遠方の葉にSSIMを誘発する移動信号として作用します.
科学分野:
- 植物免疫 植物免疫とは
- 植物シグナリング
- 分子植物病理学 分子植物病理学
背景:
- 植物には,病原体の侵入を防ぐために口腔閉塞を含む防御機構があります.
- システム反応は,外部刺激に対する全身の防御に不可欠です.
- 植物における全身性口腔免疫 (SSIM) を媒介する移動信号は,以前は知られていなかった.
研究 の 目的:
- 病原体によって引き起こされる危険信号を伝達するモバイル信号を特定する.
- システム性口腔免疫 (SSIM) の分子メカニズムを解明する.
- 遠距離植物防御シグナル伝達における新しいペプチドの役割を特徴づける.
主な方法:
- 病原菌に感染した局所および遠隔の全身葉の観察.
- 新型移動性ペプチドの識別と特徴付け,上流のオープンリーディングフレーム (uORF) 暗号化された全身のストマト免疫導体 (USIC).
- USIC受容体複合体 (SUCROSE誘導受容体キナーゼ1 (SIRK1) -キナーゼ7 (KIN7)) とメタカスペーズ4 (MC4) を含む下流信号伝達経路の分析.
主要な成果:
- 病原体感染は,局所葉のUSICの増加を引き起こし,輸送のためにアポプラストに分泌されます.
- USICは,全身葉のSIRK1-KIN7受容体複合体によって知覚され,KIN7の分裂につながります.
- KIN7は,SSIMを媒介するプロトンポンプとアクアポリンとの結合を通じて,口腔閉塞を調節する.
結論:
- uORFでコードされたペプチドであるUSICは,長距離移動信号として作用し,全身性口腔免疫 (SSIM) を誘発します.
- SIRK1-KIN7受容体複合体とMC4媒介のKIN7分裂は,SSIM経路の重要な構成要素である.
- この研究は,移動性ペプチドシグナル伝達を含む全身的な植物防御の新たなメカニズムを明らかにしています.
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