9CC9 image
Entry Detail
PDB ID:
9CC9
EMDB ID:
Keywords:
Title:
Dodecameric state of the NRC4 resistosome
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2024-06-21
Release Date:
2024-09-11
Method Details:
Experimental Method:
Resolution:
3.54 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:NLR-required for cell death 4
Chain IDs:A, B, C, D, E, F, G, H, I, J, K, L
Chain Length:881
Number of Molecules:12
Biological Source:Nicotiana benthamiana
Ligand Molecules
Primary Citation
Activation of the helper NRC4 immune receptor forms a hexameric resistosome.
Cell 187 4877 4889.e15 (2024)
PMID: 39094568 DOI: 10.1016/j.cell.2024.07.013

Abstact

Innate immune responses to microbial pathogens are regulated by intracellular receptors known as nucleotide-binding leucine-rich repeat receptors (NLRs) in both the plant and animal kingdoms. Across plant innate immune systems, "helper" NLRs (hNLRs) work in coordination with "sensor" NLRs (sNLRs) to modulate disease resistance signaling pathways. Activation mechanisms of hNLRs based on structures are unknown. Our research reveals that the hNLR, known as NLR required for cell death 4 (NRC4), assembles into a hexameric resistosome upon activation by the sNLR Bs2 and the pathogenic effector AvrBs2. This conformational change triggers immune responses by facilitating the influx of calcium ions (Ca2+) into the cytosol. The activation mimic alleles of NRC2, NRC3, or NRC4 alone did not induce Ca2+ influx and cell death in animal cells, suggesting that unknown plant-specific factors regulate NRCs' activation in plants. These findings significantly advance our understanding of the regulatory mechanisms governing plant immune responses.

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Primary Citation of related structures