受容器-チャネルトリオは,花粉管の受容のためのCa2+シグナル伝達を行います
Qifei Gao1, Chao Wang1, Yasheng Xi1
1Department of Plant and Microbial Biology, University of California at Berkeley, Berkeley, CA, USA.
Nature
|July 6, 2022
まとめ
研究者達は花粉に由来するペプチドが受精を誘発することを発見しました これらのペプチドは卵子細胞内の受容体複合体 (FER-LRE-NTA) を活性化し,植物繁殖に不可欠なカルシウム信号を誘発する.
科学分野:
- 植物生殖生物学
- 分子細胞生物学
- 生物化学
背景:
- 花の植物の受精は花粉管と卵子細胞の間の正確なコミュニケーションに依存しています.
- 卵子との花粉管の接触は,シネージドのカルシウムスパイクを誘導し,花粉管の破裂と精子の放出につながります.
- このプロセスに関与する重要なタンパク質には,FERONIA (FER),LORELEI (LRE),NORTIA (NTA) が含まれており,その相互作用メカニズムは不明でした.
研究 の 目的:
- 授精中のシネージド-花粉管のコミュニケーションの分子メカニズムを解明する.
- 花粉管とシネージド細胞の相互作用を媒介するリガンドを特定する.
- FER-LRE-NTAタンパク質複合体の機能を理解し,花粉管の受容のためのカルシウムシグナリングを開始する.
主な方法:
- 急速アルカリ化因子 (RALF) 家族に属する花粉管由来小ペプチドの特定.
- FER,LRE,NTAを含む信号経路の生化学的再構成
- カルモジュリンゲートカルシウムチャネルとしてのNTAの特徴
主要な成果:
- 2つの花粉管由来RALFペプチドは,FER- LRE共受容体のリガンドとして識別された.
- FER-LRE複合体はNTAをプラズマ膜に誘導し,そこでNTAはカルシウムチャネルとして機能する.
- RALFペプチドによるFER-LRE-NTA複合体の活性化により,シネージドのカルシウムスパイクが始まり,花粉管の受容において重要なステップとなります.
結論:
- FER-LRE-NTAタンパク質トリオは,雌性ゲメトファイトで新しい受容体チャンネル複合体を形成する.
- この複合体は男性由来ペプチド信号 (RALF) を認識し,カルシウムピークを誘発し受精を開始します.
- この研究は 植物の繁殖に不可欠な 生物化学的経路を明らかにしました
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