2J80

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.3 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:  

  • 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 bind ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SENSOR KINASE CITA
A, B
135Klebsiella pneumoniaeMutation(s): 0 
Gene Names: citA
EC: 2.7.13.3
Find proteins for P52687 (Klebsiella pneumoniae)
Go to UniProtKB:  P52687
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
FLC
Query on FLC

Download SDF File 
Download CCD File 
A, B
CITRATE ANION
C6 H5 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-K
 Ligand Interaction
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: 1.6 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.193 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 53.210α = 90.00
b = 54.790β = 90.00
c = 116.330γ = 90.00
Software Package:
Software NamePurpose
SHELXCDphasing
DENZOdata reduction
SHELXEphasing
REFMACrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-10-23
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2019-03-06
    Type: Data collection, Derived calculations, Experimental preparation, Other