1MB3

CRYSTAL STRUCTURE OF THE RESPONSE REGULATOR DIVK AT PH 8.5 IN COMPLEX WITH MG2+


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.41 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystallographic and Biochemical Studies of DivK Reveal Novel Features of an Essential Response Regulator in Caulobacter crescentus.

Guillet, V.Ohta, N.Cabantous, S.Newton, A.Samama, J.-P.

(2002) J.Biol.Chem. 277: 42003-42010

  • DOI: 10.1074/jbc.M204789200
  • Primary Citation of Related Structures:  1M5T, 1M5U, 1MAV, 1MB0

  • PubMed Abstract: 
  • DivK is an essential response regulator in the Gram-negative bacterium Caulobacter crescentus and functions in a complex phosphorelay system that precisely controls the sequence of developmental events during the cell division cycle. Structure determ ...

    DivK is an essential response regulator in the Gram-negative bacterium Caulobacter crescentus and functions in a complex phosphorelay system that precisely controls the sequence of developmental events during the cell division cycle. Structure determinations of this single domain response regulator at different pH values demonstrated that the five-stranded alpha/beta fold of the DivK protein is fully defined only at acidic pH. The crystal structures of the apoprotein and of metal-bound DivK complexes at higher pH values revealed a synergistic pH- and cation binding-induced flexibility of the beta4-alpha4 loop and of the alpha4 helix. This motion increases the solvent accessibility of the single cysteine residue in the protein. Solution state studies demonstrated a 200-fold pH-dependent increase in the affinity of manganese for the protein between pH 6.0 and 8.5 that seems to involve deprotonation of an acido-basic couple. Taken together, these results suggest that flexibility of critical regions of the protein, ionization of the cysteine 99 residue and improved K(D) values for the catalytic metal ion are coupled events. We propose that the molecular events observed in the isolated protein may be required for DivK activation and that they may be achieved in vivo through the specific protein-protein interactions between the response regulator and its cognate kinases.


    Related Citations: 
    • An Essential Single Domain Response Regulator Required for Normal Cell Division and Differentiation in Caulobacter Crescentus
      Hecht, G.B.,Lane, T.,Ohta, N.,Sommer, J.M.,Newton, A.
      (1995) Embo J. 14: 3915
    • Characterization and Crystallization of Divk, an Essential Response Regulator for Cell Division and Differentiation in Caulobacter Crescentus
      Cabantous, S.,Guillet, V.,Ohta, N.,Newton, A.,Samama, J.-P.
      (2002) Acta Crystallogr.,Sect.D 58: 1249


    Organizational Affiliation

    Groupe de Cristallographie Biologique, IPBS-CNRS, 205 route de Narbonne, 31077 Toulouse, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
cell division response regulator DivK
A
124Caulobacter crescentus (strain ATCC 19089 / CB15)N/A
Find proteins for Q9A5I4 (Caulobacter crescentus (strain ATCC 19089 / CB15))
Go to UniProtKB:  Q9A5I4
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.41 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.207 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 36.770α = 90.00
b = 41.070β = 90.00
c = 67.120γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
CCP4data scaling
MOSFLMdata reduction
CNSphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-04
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-02-01
    Type: Database references, Structure summary