1ZH2

Crystal Structure Of The Calcium-Bound Receiver Domain Of Kdp Potassium Transport System Response Regulator KdpE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A common dimerization interface in bacterial response regulators KdpE and TorR.

Toro-Roman, A.Wu, T.Stock, A.M.

(2005) Protein Sci. 14: 3077-3088

  • DOI: 10.1110/ps.051722805
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Bacterial response regulators are key regulatory proteins that function as the final elements of so-called two-component signaling systems. The activities of response regulators in vivo are modulated by phosphorylation that results from interactions ...

    Bacterial response regulators are key regulatory proteins that function as the final elements of so-called two-component signaling systems. The activities of response regulators in vivo are modulated by phosphorylation that results from interactions between the response regulator and its cognate histidine protein kinase. The level of response regulator phosphorylation, which is regulated by intra-or extracellular signals sensed by the histidine protein kinase, ultimately determines the output response that is initiated or carried out by the response regulator. We have recently hypothesized that in the OmpR/PhoB subfamily of response regulator transcription factors, this activation involves a common mechanism of dimerization using a set of highly conserved residues in the alpha4-beta5-alpha5 face. Here we report the X-ray crystal structures of the regulatory domains of response regulators TorR (1.8 A), Ca(2+)-bound KdpE (2.0 A), and Mg(2+)/BeF(3)(-)-bound KdpE (2.2 A), both members of the OmpR/ PhoB subfamily from Escherichia coli. Both regulatory domains form symmetric dimers in the asymmetric unit that involve the alpha4-beta5-alpha5 face. As observed previously in other OmpR/PhoB response regulators, the dimer interfaces are mediated by highly conserved residues within this subfamily. These results provide further evidence that most all response regulators of the OmpR/ PhoB subfamily share a common mechanism of activation by dimerization.


    Organizational Affiliation

    Center for Advanced Biotechnology and Medicine, 679 Hoes Lane, Piscataway, NJ 08854, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
KDP operon transcriptional regulatory protein kdpE
A, B
121Escherichia coli (strain K12)Mutation(s): 1 
Gene Names: kdpE
Find proteins for P21866 (Escherichia coli (strain K12))
Go to UniProtKB:  P21866
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.193 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 70.372α = 90.00
b = 127.162β = 90.00
c = 65.207γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
SCALEPACKdata scaling
DENZOdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-12-13
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance