1B00

PHOB RECEIVER DOMAIN FROM ESCHERICHIA COLI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.210 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Three-dimensional crystal structure of the transcription factor PhoB receiver domain.

Sola, M.Gomis-Ruth, F.X.Serrano, L.Gonzalez, A.Coll, M.

(1999) J.Mol.Biol. 285: 675-687

  • DOI: 10.1006/jmbi.1998.2326
  • Also Cited By: 2JBA, 2JB9

  • PubMed Abstract: 
  • PhoB is the response regulator of the two-component signal transduction system activated under phosphate starvation conditions. This protein is a transcription factor that activates more than 30 genes of the pho regulon and consists of two domains: a ...

    PhoB is the response regulator of the two-component signal transduction system activated under phosphate starvation conditions. This protein is a transcription factor that activates more than 30 genes of the pho regulon and consists of two domains: a DNA binding domain and a dimerization domain, the latter being homologous to the receiver domain described for two-component response regulators. Activation by phosphorylation induces dimerization of the protein and the consequent binding to the DNA direct repeat pho box, where it promotes the binding of RNA polymerase. In the absence of phosphorylation, the activating dimerization process can be mimicked by deletion of the DNA binding domain. The three-dimensional crystal structure of the receiver domain of PhoB from Escherichia coli has been solved by multiple anomalous diffraction using a gold derivative obtained by co-crystallization, and refined using data to 1.9 A resolution. The crystal structure reveals an alpha/beta doubly wound fold, similar to other known receivers, the most conspicuous difference being the displacement of helix alpha4 towards its N terminus. The active site includes the acidic triad Asp53 (the site of phosphorylation), Asp10 and Glu9. Lys105, from loop beta5alpha5, and Glu88, from helix alpha4, interact with Asp53 via an H-bond and a water bridge, respectively. In the asymmetric unit of the crystal there are two molecules linked by a complementary hydrophobic surface, which involves helix alpha1, loop beta5alpha5 and the N terminus of helix alpha5, and is connected to the active site through the fully conserved residue Lys105 from loop beta5alpha5. The possibility that this surface is the functional surface used for the activating dimerization is discussed.


    Related Citations: 
    • Overexpression, Purification, Crystallization and Preliminary X-Ray Diffraction Analysis of the Receiver Domain of Phob
      Sola, M.,Rueth, F.-X.G.,Serrano, L.,Gonzalez, A.,Coll, M.
      (1998) Acta Crystallogr.,Sect.D 54: 1460


    Organizational Affiliation

    CID-CSIC, Jordi Girona 18-26, Barcelona, 08034, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHOSPHATE REGULON TRANSCRIPTIONAL REGULATORY PROTEIN PHOB
A, B
127Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: phoB
Find proteins for P0AFJ5 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AFJ5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.210 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 34.110α = 90.00
b = 60.420β = 90.00
c = 119.970γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
SCALEPACKdata scaling
X-PLORrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-11-19
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance