Crystal structure of the Arabidopsis receptor kinase HAESA LRR ectdomain (apo form).

Experimental Data Snapshot

  • Resolution: 1.74 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 

wwPDB Validation   3D Report Full Report

This is version 2.0 of the entry. See complete history


Mechanistic insight into a peptide hormone signaling complex mediating floral organ abscission.

Santiago, J.Brandt, B.Wildhagen, M.Hohmann, U.Hothorn, L.A.Butenko, M.A.Hothorn, M.

(2016) Elife 5

  • DOI: https://doi.org/10.7554/eLife.15075
  • Primary Citation of Related Structures:  
    5IXO, 5IXQ, 5IXT, 5IYV, 5IYX

  • PubMed Abstract: 

    Plants constantly renew during their life cycle and thus require to shed senescent and damaged organs. Floral abscission is controlled by the leucine-rich repeat receptor kinase (LRR-RK) HAESA and the peptide hormone IDA. It is unknown how expression of IDA in the abscission zone leads to HAESA activation. Here we show that IDA is sensed directly by the HAESA ectodomain. Crystal structures of HAESA in complex with IDA reveal a hormone binding pocket that accommodates an active dodecamer peptide. A central hydroxyproline residue anchors IDA to the receptor. The HAESA co-receptor SERK1, a positive regulator of the floral abscission pathway, allows for high-affinity sensing of the peptide hormone by binding to an Arg-His-Asn motif in IDA. This sequence pattern is conserved among diverse plant peptides, suggesting that plant peptide hormone receptors may share a common ligand binding mode and activation mechanism.

  • Organizational Affiliation

    Institute of Biostatistics, Leibniz University, Hannover, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Receptor-like protein kinase 5616Arabidopsis thalianaMutation(s): 0 
Gene Names: RLK5HAEAt4g28490F21O9.180
EC: (PDB Primary Data), (PDB Primary Data)
Find proteins for P47735 (Arabidopsis thaliana)
Explore P47735 
Go to UniProtKB:  P47735
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP47735
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
B, C, D
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Resolution: 1.74 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 148.678α = 90
b = 148.678β = 90
c = 58.041γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-04-20
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary