7XEY image
Entry Detail
PDB ID:
7XEY
Keywords:
Title:
EDS1-PAD4 complexed with pRib-ADP
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2022-03-31
Release Date:
2022-07-13
Method Details:
Experimental Method:
Resolution:
2.29 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Protein EDS1
Chain IDs:A
Chain Length:623
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:Lipase-like PAD4
Chain IDs:B
Chain Length:541
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Primary Citation
Identification and receptor mechanism of TIR-catalyzed small molecules in plant immunity.
Science 377 eabq3297 eabq3297 (2022)
PMID: 35857645 DOI: 10.1126/science.abq3297

Abstact

Plant nucleotide-binding leucine-rich repeat-containing (NLR) receptors with an N-terminal Toll/interleukin-1 receptor (TIR) domain sense pathogen effectors to enable TIR-encoded nicotinamide adenine dinucleotide hydrolase (NADase) activity for immune signaling. TIR-NLR signaling requires the helper NLRs N requirement gene 1 (NRG1), Activated Disease Resistance 1 (ADR1), and Enhanced Disease Susceptibility 1 (EDS1), which forms a heterodimer with each of its paralogs Phytoalexin Deficient 4 (PAD4) and Senescence-Associated Gene 101 (SAG101). Here, we show that TIR-containing proteins catalyze the production of 2'-(5''-phosphoribosyl)-5'-adenosine monophosphate (pRib-AMP) and diphosphate (pRib-ADP) in vitro and in planta. Biochemical and structural data demonstrate that EDS1-PAD4 is a receptor complex for pRib-AMP and pRib-ADP, which allosterically promote EDS1-PAD4 interaction with ADR1-L1 but not NRG1A. Our study identifies TIR-catalyzed pRib-AMP and pRib-ADP as a missing link in TIR signaling through EDS1-PAD4 and as likely second messengers for plant immunity.

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Primary Citation of related structures