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オリゴメリゼーション媒介による植物性NLRの自己抑制とコファクター結合

Shoucai Ma^1,2, Chunpeng An³, Aaron W Lawson³

¹School of Life Sciences, Westlake University, Institute of Biology, Westlake Institute for Advanced Study, Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou, China. mashoucai@xhlab.ac.cn.

|June 12, 2024

まとめ

植物免疫受容体は,核酸結合レウシン豊富なリピート (NLR) タンパク質であり,二分化によって自己抑制することができる. イノシトール・フォスファートはこれらの受容体に結合し,植物免疫を調節し,自己免疫を予防します.

科学分野:

植物免疫
植物防御の分子機構
タンパク質の構造と機能

背景:

核酸結合レウシン濃度の重複タンパク質 (NLR) は,病原体を認識する植物免疫反応に不可欠です.
制御不能なNLR活動は自己免疫性につながるため,厳格な規制の必要性を強調しています.
細胞死2 (NRC2) に必要な植物NLRは構成的に発現するが,その調節メカニズムはよくわかっていない.

研究の目的:

Solanum lycopersicum NRC2 (SlNRC2) の自己抑制と活性化のメカニズムを解明する.
SlNRC2の規制におけるオリゴメリゼーションとイノシトール・フォスファートの役割を調査する.

主な方法:

SlNRC2オリゴメアの構造を決定するための冷凍電子顕微鏡 (冷凍EM)
イノシトール・フォスファート結合を確認するための質量スペクトロメトリー
特定されたインターフェースと結合部位の機能を評価するサイト指向型変異.

主要な成果:

SlNRC2は,より高い濃度でダイマー,テトラーマー,およびより高いオリゴーマーを形成し,不活性な形状を採用します.
オリゴメリゼーションは不活性状態を安定させ,活性形態の組み立てを防ぐ.
Cryo-EMは,SlnRC2のC末端領域に結合したイノシトールヘキサキスファート (IP6) またはペンタキスファート (IP5) を明らかにした.
変異が二酸化界面やイノシトール・フォスファート結合を妨害すると植物免疫と細胞死が強化される.

結論:

オリゴメリゼーションとイノシトール・フォスファートは,NRC2の活性化の負の調節剤として作用し,その不活性状態を維持する.
イノシトールリン酸は,NRCタンパク質の共因体として機能し,植物免疫反応を調節する.
これらの調節メカニズムを理解することは植物免疫を制御し自己免疫を防ぐための鍵です

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