3HZH

Crystal structure of the CheX-CheY-BeF3-Mg+2 complex from Borrelia burgdorferi


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.248 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Identical phosphatase mechanisms achieved through distinct modes of binding phosphoprotein substrate.

Pazy, Y.Motaleb, M.A.Guarnieri, M.T.Charon, N.W.Zhao, R.Silversmith, R.E.

(2010) Proc.Natl.Acad.Sci.USA 107: 1924-1929

  • DOI: 10.1073/pnas.0911185107

  • PubMed Abstract: 
  • Two-component signal transduction systems are widespread in prokaryotes and control numerous cellular processes. Extensive investigation of sensor kinase and response regulator proteins from many two-component systems has established conserved sequen ...

    Two-component signal transduction systems are widespread in prokaryotes and control numerous cellular processes. Extensive investigation of sensor kinase and response regulator proteins from many two-component systems has established conserved sequence, structural, and mechanistic features within each family. In contrast, the phosphatases which catalyze hydrolysis of the response regulator phosphoryl group to terminate signal transduction are poorly understood. Here we present structural and functional characterization of a representative of the CheC/CheX/FliY phosphatase family. The X-ray crystal structure of Borrelia burgdorferi CheX complexed with its CheY3 substrate and the phosphoryl analogue reveals a binding orientation between a response regulator and an auxiliary protein different from that shared by every previously characterized example. The surface of CheY3 containing the phosphoryl group interacts directly with a long helix of CheX which bears the conserved (E - X(2) - N) motif. Conserved CheX residues Glu96 and Asn99, separated by a single helical turn, insert into the CheY3 active site. Structural and functional data indicate that CheX Asn99 and CheY3 Thr81 orient a water molecule for hydrolytic attack. The catalytic residues of the CheX.CheY3 complex are virtually superimposable on those of the Escherichia coli CheZ phosphatase complexed with CheY, even though the active site helices of CheX and CheZ are oriented nearly perpendicular to one other. Thus, evolution has found two structural solutions to achieve the same catalytic mechanism through different helical spacing and side chain lengths of the conserved acid/amide residues in CheX and CheZ.


    Organizational Affiliation

    Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, NC 27599, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chemotaxis response regulator (CheY-3)
A
157Borrelia burgdorferi (strain ATCC 35210 / B31 / CIP 102532 / DSM 4680)Mutation(s): 0 
Find proteins for O51615 (Borrelia burgdorferi (strain ATCC 35210 / B31 / CIP 102532 / DSM 4680))
Go to UniProtKB:  O51615
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Chemotaxis operon protein (CheX)
B
172Borrelia burgdorferi (strain ATCC 35210 / B31 / CIP 102532 / DSM 4680)Mutation(s): 0 
Find proteins for O51614 (Borrelia burgdorferi (strain ATCC 35210 / B31 / CIP 102532 / DSM 4680))
Go to UniProtKB:  O51614
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
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
BFD
Query on BFD
A
L-PEPTIDE LINKINGC4 H6 Be F3 N O4ASP
MSE
Query on MSE
B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.248 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 63.705α = 90.00
b = 63.705β = 90.00
c = 175.685γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
RESOLVEphasing
CNSrefinement
RESOLVEmodel building
HKL-2000data scaling
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-02-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance