直接的なリガンド受容体複合体の相互作用は,ブラシカの自己不適合性を制御する.
S Takayama1, H Shimosato, H Shiba
1Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0101, Japan.
Nature
|October 5, 2001
まとめ
高い植物は,自己不適合性を用いて自己受精を防ぐ. ブラシカでは,S-ロカスタンパク質11 (SP11) がスティグマS受容体キナーゼ (SRK) と結合して,この反応を誘発し,SLG.と受容体複合体を形成します.
科学分野:
- 植物の生殖生物学 植物の生殖生物学
- 分子遺伝学 分子遺伝学
- バイオケミストリー バイオケミストリー
背景:
- 自己不適合性 (SI) 機構は,多くの植物において自己受精を防ぐ.
- ブラシカでは,S-ロクスがSIを制御し,S-受容体キナーゼ (SRK),S-ロクスのタンパク質11 (SP11) /S-ロクスのシステインに富んだタンパク質 (SCR),S-ロクスのグリコタンパク質 (SLG) を含む.
- SP11は花粉のS-ハプロタイプ特異性を決定し,SRKはスティグマのS-ハプロタイプ特異性を決定する.
研究 の 目的:
- SP11がSRKとSLGと相互作用して自己不互換性を媒介する分子メカニズムを解明する.
- 自己相容れない反応の強化におけるSLGの役割を調査する.
主な方法:
- S8-SP11の構造と機能の生化学分析.
- S8-SP11,SRK8,およびSLG8.8との相互作用を決定するための結合測定法.
- SRK8の自己リン酸化を評価するためのインビトロキナーゼアッセイ.
主要な成果:
- ディスルファイド結合によって安定したS8-SP11の特定の形態は,S8ハプロタイプのスティグマ膜に結合する.
- S8-SP11結合はSRK8.8の自己リン酸化を誘導する.
- SRK8とSLG8は,スティグマ膜のS8-SP11と高親和感受体複合体を形成する.
結論:
- SP11は,シグマ膜上のSRKと直接相互作用し,SI応答を開始します.
- SLGはSRK-SP11受容体複合体の構成要素として作用し,SI信号伝達を強化します.
- この研究は,Brassicaの自己不適合性の分子基礎を明らかにしています.
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