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-Structure paper
| タイトル | A disease resistance protein triggers oligomerization of its NLR helper into a hexameric resistosome to mediate innate immunity. |
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| ジャーナル・号・ページ | Sci Adv, Vol. 10, Issue 45, Page eadr2594, Year 2024 |
| 掲載日 | 2024年11月8日 |
著者 | Jogi Madhuprakash / AmirAli Toghani / Mauricio P Contreras / Andres Posbeyikian / Jake Richardson / Jiorgos Kourelis / Tolga O Bozkurt / Michael W Webster / Sophien Kamoun / ![]() |
| PubMed 要旨 | NRCs are essential helper NLR (nucleotide-binding domain and leucine-rich repeat) proteins that execute immune responses triggered by sensor NLRs. The resting state of NbNRC2 was recently shown to be ...NRCs are essential helper NLR (nucleotide-binding domain and leucine-rich repeat) proteins that execute immune responses triggered by sensor NLRs. The resting state of NbNRC2 was recently shown to be a homodimer, but the sensor-activated state remains unclear. Using cryo-EM, we determined the structure of sensor-activated NbNRC2, which forms a hexameric inflammasome-like resistosome. Mutagenesis of the oligomerization interface abolished immune signaling, confirming the functional significance of the NbNRC2 resistosome. Comparative structural analyses between the resting state homodimer and sensor-activated homohexamer revealed substantial rearrangements, providing insights into NLR activation mechanisms. Furthermore, structural comparisons between NbNRC2 hexamer and previously reported CC-NLR pentameric assemblies revealed features allowing an additional protomer integration. Using the NbNRC2 hexamer structure, we assessed the recently released AlphaFold 3 for predicting activated CC-NLR oligomers, revealing high-confidence modeling of NbNRC2 and other CC-NLR amino-terminal α1 helices, a region proven difficult to resolve structurally. Overall, our work sheds light on NLR activation mechanisms and expands understanding of NLR structural diversity. |
リンク | Sci Adv / PubMed:39504373 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.9 Å |
| 構造データ | EMDB-50637, PDB-9fp6: |
| 化合物 | ![]() ChemComp-ATP: |
| 由来 |
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キーワード | IMMUNE SYSTEM / Plant immunity / complex |
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