1EHC

STRUCTURE OF SIGNAL TRANSDUCTION PROTEIN CHEY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.26 Å
  • R-Value Work: 0.143 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Uncoupled phosphorylation and activation in bacterial chemotaxis. The 2.3 A structure of an aspartate to lysine mutant at position 13 of CheY.

Jiang, M.Bourret, R.B.Simon, M.I.Volz, K.

(1997) J Biol Chem 272: 11850-11855

  • DOI: 10.1074/jbc.272.18.11850
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • An aspartate to lysine mutation at position 13 of the chemotaxis regulatory protein CheY causes a constitutive tumbly phenotype when expressed at high copy number in vivo even though the mutant protein is not phosphorylatable. These properties sugges ...

    An aspartate to lysine mutation at position 13 of the chemotaxis regulatory protein CheY causes a constitutive tumbly phenotype when expressed at high copy number in vivo even though the mutant protein is not phosphorylatable. These properties suggest that the D13K mutant adopts the active, signaling conformation of CheY independent of phosphorylation, so knowledge of its structure could explain the activation mechanism of CheY. The x-ray crystallographic structure of the CheY D13K mutant has been solved and refined at 2.3 A resolution to an R-factor of 14.3%. The mutant molecule shows no significant differences in backbone conformation when compared with the wild-type, Mg2+-free structure, but there are localized changes within the active site. The side chain of lysine 13 blocks access to the active site, whereas its epsilon-amino group has no bonding interactions with other groups in the region. Also in the active site, the bond between lysine 109 and aspartate 57 is weakened, and the solvent structure is perturbed. Although the D13K mutant has the inactive conformation in the crystalline form, rearrangements in the active site appear to weaken the overall structure of that region, potentially creating a metastable state of the molecule. If a conformational change is required for signaling by CheY D13K, then it most likely proceeds dynamically, in solution.


    Related Citations: 
    • Crystal Structures of Chey Mutants Y106W and T87I/Y106W. Chey Activation Correlates with Movement of Residue 106
      Zhu, X., Rebello, J., Matsumura, P., Volz, K.
      (1997) J Biol Chem 272: 5000
    • Uncoupled Phosphorylation and Activation in Bacterial Chemotaxis. The 2.1-A Structure of a Threonine to Isoleucine Mutant at Position 87 of Chey
      Ganguli, S., Wang, H., Matsumura, P., Volz, K.
      (1995) J Biol Chem 270: 17386
    • Structural Conservation in the Chey Superfamily
      Volz, K.
      (1993) Biochemistry 32: 11741
    • Crystal Structure of Escherichia Coli Chey Refined at 1.7-A Resolution
      Volz, K., Matsumura, P.
      (1991) J Biol Chem 266: 15511

    Organizational Affiliation

    Department of Microbiology and Immunology, University of Illinois, Chicago, Illinois 60612, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CHEYA128Escherichia coli K-12Mutation(s): 1 
Gene Names: cheYb1882JW1871
Find proteins for P0AE67 (Escherichia coli (strain K12))
Explore P0AE67 
Go to UniProtKB:  P0AE67
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.26 Å
  • R-Value Work: 0.143 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.85α = 90
b = 47.03β = 90
c = 54.04γ = 90
Software Package:
Software NamePurpose
PROFFTrefinement
XENGENdata reduction
XENGENdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-05-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance