2V9A

Structure of Citrate-free Periplasmic Domain of Sensor Histidine Kinase CitA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.212 

Starting Model: experimental
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This is version 1.5 of the entry. See complete history


Literature

A Ligand-Induced Switch in the Periplasmic Domain of Sensor Histidine Kinase Cita.

Sevvana, M.Vijayan, V.Zweckstetter, M.Reinelt, S.Madden, D.R.Herbst-Irmer, R.Sheldrick, G.M.Bott, M.Griesinger, C.Becker, S.

(2008) J Mol Biol 377: 512

  • DOI: https://doi.org/10.1016/j.jmb.2008.01.024
  • Primary Citation of Related Structures:  
    2J80, 2V9A

  • PubMed Abstract: 

    Sensor histidine kinases of two-component signal-transduction systems are essential for bacteria to adapt to variable environmental conditions. However, despite their prevalence, it is not well understood how extracellular signals such as ligand binding regulate the activity of these sensor kinases. CitA is the sensor histidine kinase in Klebsiella pneumoniae that regulates the transport and anaerobic metabolism of citrate in response to its extracellular concentration. We report here the X-ray structures of the periplasmic sensor domain of CitA in the citrate-free and citrate-bound states. A comparison of the two structures shows that ligand binding causes a considerable contraction of the sensor domain. This contraction may represent the molecular switch that activates transmembrane signaling in the receptor.


  • Organizational Affiliation

    Department of Structural Chemistry, University of Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SENSOR KINASE CITA
A, B
133Klebsiella pneumoniaeMutation(s): 0 
EC: 2.7.13.3
UniProt
Find proteins for P52687 (Klebsiella pneumoniae)
Explore P52687 
Go to UniProtKB:  P52687
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52687
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.212 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.163α = 90
b = 64.163β = 90
c = 144.746γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-03-25
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-03-06
    Changes: Data collection, Experimental preparation, Other
  • Version 1.4: 2019-05-08
    Changes: Data collection, Experimental preparation
  • Version 1.5: 2023-12-13
    Changes: Data collection, Database references, Other, Refinement description