Arabidopsis histidine kinase 4 sensor domain in complex with thiadiazuron

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.183 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.3 of the entry. See complete history


Structural basis for cytokinin recognition by Arabidopsis thaliana histidine kinase 4.

Hothorn, M.Dabi, T.Chory, J.

(2011) Nat Chem Biol 7: 766-768

  • DOI: https://doi.org/10.1038/nchembio.667
  • Primary Citation of Related Structures:  
    3T4J, 3T4K, 3T4L, 3T4O, 3T4Q, 3T4S, 3T4T

  • PubMed Abstract: 

    Cytokinins are classic hormones that orchestrate plant growth and development and the integrity of stem cell populations. Cytokinin receptors are eukaryotic sensor histidine kinases that are activated by both naturally occurring adenine-type cytokinins and urea-based synthetic compounds. Crystal structures of the Arabidopsis thaliana histidine kinase 4 sensor domain in complex with different cytokinin ligands now rationalize the hormone-binding specificity of the receptor and may spur the design of new cytokinin ligands.

  • Organizational Affiliation

    Plant Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Histidine kinase 4
A, B
270Arabidopsis thalianaMutation(s): 0 
Gene Names: AHK4At2g01830CRE1RAW1T23K3.2WOL
EC: (PDB Primary Data), (PDB Primary Data)
Find proteins for Q9C5U0 (Arabidopsis thaliana)
Explore Q9C5U0 
Go to UniProtKB:  Q9C5U0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9C5U0
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
WA1 BindingDB:  3T4T EC50: 1000 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.183 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.09α = 90
b = 60.09β = 90
c = 297.58γ = 120
Software Package:
Software NamePurpose
ADSCdata collection
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History 

Deposition Data

  • Released Date: 2011-10-05 
  • Deposition Author(s): Hothorn, M.

Revision History  (Full details and data files)

  • Version 1.0: 2011-10-05
    Type: Initial release
  • Version 1.1: 2011-12-14
    Changes: Database references
  • Version 1.2: 2012-07-25
    Changes: Other
  • Version 1.3: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description