7DRC image
Entry Detail
PDB ID:
7DRC
EMDB ID:
Keywords:
Title:
Cryo-EM structure of plant receptor like protein RXEG1 in complex with xyloglucanase XEG1 and BAK1
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2020-12-27
Release Date:
2022-06-22
Method Details:
Experimental Method:
Resolution:
2.92 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Cell 12A endoglucanase
Chain IDs:A
Chain Length:241
Number of Molecules:1
Biological Source:Phytophthora sojae
Polymer Type:polypeptide(L)
Description:Brassinosteroid insensitive 1-associated receptor kinase 1
Chain IDs:C (auth: B)
Chain Length:228
Number of Molecules:1
Biological Source:Nicotiana benthamiana
Polymer Type:polypeptide(L)
Description:Membrane-localized LRR receptor-like protein
Chain IDs:B (auth: C)
Chain Length:934
Number of Molecules:1
Biological Source:Nicotiana benthamiana
Ligand Molecules
Primary Citation
Plant receptor-like protein activation by a microbial glycoside hydrolase.
Nature 610 335 342 (2022)
PMID: 36131021 DOI: 10.1038/s41586-022-05214-x

Abstact

Plants rely on cell-surface-localized pattern recognition receptors to detect pathogen- or host-derived danger signals and trigger an immune response1-6. Receptor-like proteins (RLPs) with a leucine-rich repeat (LRR) ectodomain constitute a subgroup of pattern recognition receptors and play a critical role in plant immunity1-3. Mechanisms underlying ligand recognition and activation of LRR-RLPs remain elusive. Here we report a crystal structure of the LRR-RLP RXEG1 from Nicotiana benthamiana that recognizes XEG1 xyloglucanase from the pathogen Phytophthora sojae. The structure reveals that specific XEG1 recognition is predominantly mediated by an amino-terminal and a carboxy-terminal loop-out region (RXEG1(ID)) of RXEG1. The two loops bind to the active-site groove of XEG1, inhibiting its enzymatic activity and suppressing Phytophthora infection of N. benthamiana. Binding of XEG1 promotes association of RXEG1(LRR) with the LRR-type co-receptor BAK1 through RXEG1(ID) and the last four conserved LRRs to trigger RXEG1-mediated immune responses. Comparison of the structures of apo-RXEG1(LRR), XEG1-RXEG1(LRR) and XEG1-BAK1-RXEG1(LRR) shows that binding of XEG1 induces conformational changes in the N-terminal region of RXEG1(ID) and enhances structural flexibility of the BAK1-associating regions of RXEG1(LRR). These changes allow fold switching of RXEG1(ID) for recruitment of BAK1(LRR). Our data reveal a conserved mechanism of ligand-induced heterodimerization of an LRR-RLP with BAK1 and suggest a dual function for the LRR-RLP in plant immunity.

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