2J80

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

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.194 

wwPDB Validation   3D Report Full Report


This is version 1.4 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: 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 ...

    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
MoleculeChainsSequence LengthOrganismDetailsImage
SENSOR KINASE CITAA, B135Klebsiella pneumoniaeMutation(s): 0 
Gene Names: citA
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
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE		A, B L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.194 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.21α = 90
b = 54.79β = 90
c = 116.33γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
SHELXCDphasing
SHELXEphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-10-23
    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, Derived calculations, Experimental preparation, Other
  • Version 1.4: 2019-05-08
    Changes: Data collection, Experimental preparation