8HPB image
Entry Detail
PDB ID:
8HPB
Keywords:
Title:
NMR Structure of OsCIE1-Ubox S237D mutant
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2022-12-12
Release Date:
2023-12-20
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
20
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:U-box domain-containing protein 12
Mutations:S237D
Chain IDs:A, B
Chain Length:80
Number of Molecules:2
Biological Source:Oryza sativa Japonica Group
Ligand Molecules
Primary Citation
Release of a ubiquitin brake activates OsCERK1-triggered immunity in rice.
Nature 629 1158 1164 (2024)
PMID: 38750355 DOI: 10.1038/s41586-024-07418-9

Abstact

Plant pattern-recognition receptors perceive microorganism-associated molecular patterns to activate immune signalling1,2. Activation of the pattern-recognition receptor kinase CERK1 is essential for immunity, but tight inhibition of receptor kinases in the absence of pathogen is crucial to prevent autoimmunity3,4. Here we find that the U-box ubiquitin E3 ligase OsCIE1 acts as a molecular brake to inhibit OsCERK1 in rice. During homeostasis, OsCIE1 ubiquitinates OsCERK1, reducing its kinase activity. In the presence of the microorganism-associated molecular pattern chitin, active OsCERK1 phosphorylates OsCIE1 and blocks its E3 ligase activity, thus releasing the brake and promoting immunity. Phosphorylation of a serine within the U-box of OsCIE1 prevents its interaction with E2 ubiquitin-conjugating enzymes and serves as a phosphorylation switch. This phosphorylation site is conserved in E3 ligases from plants to animals. Our work identifies a ligand-released brake that enables dynamic immune regulation.

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Primary Citation of related structures