Crystal structure of plant Receptor-like Kinase ANX1

Experimental Data Snapshot

  • Resolution: 2.94 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Mechanisms of RALF peptide perception by a heterotypic receptor complex.

Xiao, Y.Stegmann, M.Han, Z.DeFalco, T.A.Parys, K.Xu, L.Belkhadir, Y.Zipfel, C.Chai, J.

(2019) Nature 572: 270-274

  • DOI: https://doi.org/10.1038/s41586-019-1409-7
  • Primary Citation of Related Structures:  
    6A5A, 6A5B, 6A5C, 6A5D, 6A5E

  • PubMed Abstract: 

    Receptor kinases of the Catharanthus roseus RLK1-like (CrRLK1L) family have emerged as important regulators of plant reproduction, growth and responses to the environment 1 . Endogenous RAPID ALKALINIZATION FACTOR (RALF) peptides 2 have previously been proposed as ligands for several members of the CrRLK1L family 1 . However, the mechanistic basis of this perception is unknown. Here we report that RALF23 induces a complex between the CrRLK1L FERONIA (FER) and LORELEI (LRE)-LIKE GLYCOSYLPHOSPHATIDYLINOSITOL (GPI)-ANCHORED PROTEIN 1 (LLG1) to regulate immune signalling. Structural and biochemical data indicate that LLG1 (which is genetically important for RALF23 responses) and the related LLG2 directly bind RALF23 to nucleate the assembly of RALF23-LLG1-FER and RALF23-LLG2-FER heterocomplexes, respectively. A conserved N-terminal region of RALF23 is sufficient for the biochemical recognition of RALF23 by LLG1, LLG2 or LLG3, and binding assays suggest that other RALF peptides that share this conserved N-terminal region may be perceived by LLG proteins in a similar manner. Structural data also show that RALF23 recognition is governed by the conformationally flexible C-terminal sides of LLG1, LLG2 and LLG3. Our work reveals a mechanism of peptide perception in plants by GPI-anchored proteins that act together with a phylogenetically unrelated receptor kinase. This provides a molecular framework for understanding how diverse RALF peptides may regulate multiple processes, through perception by distinct heterocomplexes of CrRLK1L receptor kinases and GPI-anchored proteins of the LRE and LLG family.

  • Organizational Affiliation

    School of Life Sciences, Innovation Center for Structural Biology, Tsinghua-Peking Joint Center for Life Sciences, Tsinghua University, Beijing, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Receptor-like protein kinase ANXUR1A [auth B],
B [auth A]
385Arabidopsis thalianaMutation(s): 0 
Gene Names: ANX1
Find proteins for Q9SR05 (Arabidopsis thaliana)
Explore Q9SR05 
Go to UniProtKB:  Q9SR05
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9SR05
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.94 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.200 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.337α = 90
b = 77.546β = 100.52
c = 99.288γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-26
    Type: Initial release
  • Version 1.1: 2020-01-15
    Changes: Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description