1U8T

Crystal structure of CheY D13K Y106W alone and in complex with a FliM peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of the Constitutively Active Double Mutant CheY(D13K Y106W) Alone and in Complex with a FliM Peptide

Dyer, C.M.Quillin, M.L.Campos, A.Lu, J.McEvoy, M.M.Hausrath, A.C.Westbrook, E.M.Matsumura, P.Matthews, B.W.Dahlquist, F.W.

(2004) J Mol Biol 342: 1325-1335

  • DOI: https://doi.org/10.1016/j.jmb.2004.07.084
  • Primary Citation of Related Structures:  
    1U8T

  • PubMed Abstract: 

    CheY is a member of the response regulator protein superfamily that controls the chemotactic swimming response of motile bacteria. The CheY double mutant D13K Y106W (CheY**) is resistant to phosphorylation, yet is a highly effective mimic of phosphorylated CheY in vivo and in vitro. The conformational attributes of this protein that enable it to signal in a phosphorylation-independent manner are unknown. We have solved the crystal structure of selenomethionine-substituted CheY** in the presence of its target, a peptide (FliM16) derived from the flagellar motor switch, FliM, to 1.5A resolution with an R-factor of 19.6%. The asymmetric unit contains four CheY** molecules, two with FliM16 bound, and two without. The two CheY** molecules in the asymmetric unit that are bound to FliM16 adopt a conformation similar to BeF3- -activated wild-type CheY, and also bind FliM16 in a nearly identical manner. The CheY** molecules that do not bind FliM16 are found in a conformation similar to unphosphorylated wild-type CheY, suggesting that the active phenotype of this mutant is enabled by a facile interconversion between the active and inactive conformations. Finally, we propose a ligand-binding model for CheY and CheY**, in which Ile95 changes conformation in a Tyr/Trp106-dependent manner to accommodate FliM.


  • Organizational Affiliation

    Institute of Molecular Biology, University of Oregon, Eugene, OR 97403, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chemotaxis protein cheY
A, B, C, D
128Escherichia coliMutation(s): 8 
Gene Names: cheY
UniProt
Find proteins for P0AE67 (Escherichia coli (strain K12))
Explore P0AE67 
Go to UniProtKB:  P0AE67
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AE67
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Flagellar motor switch protein fliM
E, F
16N/AMutation(s): 0 
UniProt
Find proteins for P06974 (Escherichia coli (strain K12))
Explore P06974 
Go to UniProtKB:  P06974
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06974
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.200 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.28α = 60.36
b = 53.48β = 60.75
c = 54.1γ = 60.57
Software Package:
Software NamePurpose
d*TREKdata scaling
SCALEPACKdata scaling
SHARPphasing
TNTrefinement
d*TREKdata reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-10-05
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations