Biotechnology and Biological Sciences Research Council (BBSRC)
V002937/1
英国
引用
ジャーナル: PLoS Biol / 年: 2024 タイトル: Activation of plant immunity through conversion of a helper NLR homodimer into a resistosome. 著者: Muniyandi Selvaraj / AmirAli Toghani / Hsuan Pai / Yu Sugihara / Jiorgos Kourelis / Enoch Lok Him Yuen / Tarhan Ibrahim / He Zhao / Rongrong Xie / Abbas Maqbool / Juan Carlos De la Concepcion ...著者: Muniyandi Selvaraj / AmirAli Toghani / Hsuan Pai / Yu Sugihara / Jiorgos Kourelis / Enoch Lok Him Yuen / Tarhan Ibrahim / He Zhao / Rongrong Xie / Abbas Maqbool / Juan Carlos De la Concepcion / Mark J Banfield / Lida Derevnina / Benjamin Petre / David M Lawson / Tolga O Bozkurt / Chih-Hang Wu / Sophien Kamoun / Mauricio P Contreras / 要旨: Nucleotide-binding domain and leucine-rich repeat (NLR) proteins can engage in complex interactions to detect pathogens and execute a robust immune response via downstream helper NLRs. However, the ...Nucleotide-binding domain and leucine-rich repeat (NLR) proteins can engage in complex interactions to detect pathogens and execute a robust immune response via downstream helper NLRs. However, the biochemical mechanisms of helper NLR activation by upstream sensor NLRs remain poorly understood. Here, we show that the coiled-coil helper NLR NRC2 from Nicotiana benthamiana accumulates in vivo as a homodimer that converts into a higher-order oligomer upon activation by its upstream virus disease resistance protein Rx. The cryo-EM structure of NbNRC2 in its resting state revealed intermolecular interactions that mediate homodimer formation and contribute to immune receptor autoinhibition. These dimerization interfaces have diverged between paralogous NRC proteins to insulate critical network nodes and enable redundant immune pathways, possibly to minimise undesired cross-activation and evade pathogen suppression of immunity. Our results expand the molecular mechanisms of NLR activation pointing to transition from homodimers to higher-order oligomeric resistosomes.
名称: NRC2 heler NLR dimer with ADP / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1 詳細: This is helper NLR protein NRC2 in inactive state with ADP nucleotide bound state
凍結剤: ETHANE / チャンバー内湿度: 95 % / チャンバー内温度: 277 K / 装置: FEI VITROBOT MARK IV 詳細: The C-flat grids were coated with grphene oxide, in house and the sample was applied two times inside the vitrobot chamber.
詳細
the particles are NRC2 purified from plant after over expression. This was suspended in buffer and cryogrids were made on graphene oxide backing
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電子顕微鏡法
顕微鏡
TFS KRIOS
撮影
フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 撮影したグリッド数: 1 / 実像数: 6000 / 平均露光時間: 2.6 sec. / 平均電子線量: 50.0 e/Å2
Chain - Residue range: 1-880 / Chain - Source name: AlphaFold / Chain - Initial model type: in silico model / 詳細: This is the full length sequence of NRC
精密化
空間: REAL / プロトコル: FLEXIBLE FIT / 温度因子: 100 / 当てはまり具合の基準: CC
得られたモデル
PDB-8rfh: CryoEM structure of the plant helper NLR NRC2 in its resting state