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-Structure paper
| タイトル | A plant pathogen effector blocks stepwise assembly of a helper NLR resistosome. |
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| ジャーナル・号・ページ | Sci Adv, Vol. 12, Issue 23, Page eaeb1931, Year 2026 |
| 掲載日 | 2026年6月5日 |
著者 | Benjamin A Seager / Adeline Harant / Mauricio P Contreras / Liang-Yu Hou / Chih Hang Wu / Sophien Kamoun / Jogi Madhuprakash / ![]() |
| PubMed 要旨 | Helper NLRs function as central nodes in plant immune networks. Upon activation, they oligomerize into inflammasome-like resistosomes to initiate immune signaling, yet the dynamics of resistosome ...Helper NLRs function as central nodes in plant immune networks. Upon activation, they oligomerize into inflammasome-like resistosomes to initiate immune signaling, yet the dynamics of resistosome assembly remain poorly understood. Here, we show that the virulence effector AVRcap1b from the Irish potato famine pathogen suppresses immune activation by directly engaging oligomerization intermediates of the tomato helper NLR SlNRC3. Cryo-EM structures of SlNRC3 in AVRcap1b-bound and unbound states reveal that AVRcap1b bridges multiple protomers, stabilizing a stalled intermediate and preventing formation of a functional resistosome. Leveraging AVRcap1b as a molecular tool, we also capture an additional SlNRC3 resistosome intermediate showing that assembly proceeds in a stepwise manner from dissociated monomers. These findings uncover a previously unrecognized vulnerability in NLR activation and reveal a pathogen strategy that disrupts immune complex assembly. This work advances mechanistic understanding of resistosome formation and uncovers a previously unrecognized facet of pathogen-plant coevolution. |
リンク | Sci Adv / PubMed:42247517 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.85 - 3.21 Å |
| 構造データ | ![]() EMDB-53988: Consensus cryo-EM map of SlNRC3-AVRcap1b complex ![]() EMDB-53989: Focused refined cryo-EM map of SlNRC3-AVRcap1b complex EMDB-53990, PDB-9ri9: EMDB-53991, PDB-9ria: |
| 化合物 | ![]() ChemComp-ATP: |
| 由来 |
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キーワード | IMMUNE SYSTEM / Plant Immunity / NLR / Resistosome / Effector |
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phytophthora infestans (真核生物)
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