3MM4

Crystal structure of the receiver domain of the histidine kinase CKI1 from Arabidopsis thaliana


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.179 

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This is version 1.2 of the entry. See complete history


Literature

Structure and binding specificity of the receiver domain of sensor histidine kinase CKI1 from Arabidopsis thaliana.

Pekarova, B.Klumpler, T.Triskova, O.Horak, J.Jansen, S.Dopitova, R.Borkovcova, P.Papouskova, V.Nejedla, E.Sklenar, V.Marek, J.Zidek, L.Hejatko, J.Janda, L.

(2011) Plant J 67: 827-839

  • DOI: 10.1111/j.1365-313X.2011.04637.x
  • Primary Citation of Related Structures:  
    3MM4, 3MMN

  • PubMed Abstract: 
  • Multistep phosphorelay (MSP) signaling mediates responses to a variety of important stimuli in plants. In Arabidopsis MSP, the signal is transferred from sensor histidine kinase (HK) via histidine phosphotransfer proteins (AHP1-AHP5) to nuclear response regulators ...

    Multistep phosphorelay (MSP) signaling mediates responses to a variety of important stimuli in plants. In Arabidopsis MSP, the signal is transferred from sensor histidine kinase (HK) via histidine phosphotransfer proteins (AHP1-AHP5) to nuclear response regulators. In contrast to ancestral two-component signaling in bacteria, protein interactions in plant MSP are supposed to be rather nonspecific. Here, we show that the C-terminal receiver domain of HK CKI1 (CKI1(RD) ) is responsible for the recognition of CKI1 downstream signaling partners, and specifically interacts with AHP2, AHP3 and AHP5 with different affinities. We studied the effects of Mg²⁺, the co-factor necessary for signal transduction via MSP, and phosphorylation-mimicking BeF₃⁻ on CKI1(RD) in solution, and determined the crystal structure of free CKI1(RD) and CKI1(RD) in a complex with Mg²⁺. We found that the structure of CKI1(RD) shares similarities with the only known structure of plant HK, ETR1(RD) , with the main differences being in loop L3. Magnesium binding induces the rearrangement of some residues around the active site of CKI1(RD) , as was determined by both X-ray crystallography and NMR spectroscopy. Collectively, these results provide initial insights into the nature of molecular mechanisms determining the specificity of MSP signaling and MSP catalysis in plants.


    Related Citations: 
    • Cloning, purification, crystallization and preliminary X-ray analysis of the receiver domain of the histidine kinase CKI1 from Arabidopsis thaliana.
      Klumpler, T., Pekarova, B., Marek, J., Borkovcova, P., Janda, L., Hejatko, J.
      (2009) Acta Crystallogr Sect F Struct Biol Cryst Commun 65: 478

    Organizational Affiliation

    Department of Functional Genomics and Proteomics, Masaryk University, Kotlářská 2, CZ-61137 Brno, Czech Republic.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Histidine kinase homologA206Arabidopsis thalianaMutation(s): 0 
Gene Names: CKI1At2g47430T30B22.27
EC: 2.7.13.3
UniProt
Find proteins for O22267 (Arabidopsis thaliana)
Explore O22267 
Go to UniProtKB:  O22267
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.179 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.458α = 90
b = 99.825β = 90
c = 79.943γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
MAR345dtbdata collection
XDSdata reduction
XDSdata scaling
MrBUMPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-04-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-09-14
    Changes: Database references