Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Towards understanding a molecular switch mechanism: thermodynamic and crystallographic studies of the signal transduction protein CheY.

Sola, M.Lopez-Hernandez, E.Cronet, P.Lacroix, E.Serrano, L.Coll, M.Parraga, A.

(2000) J Mol Biol 303: 213-225

  • DOI: https://doi.org/10.1006/jmbi.2000.4507
  • Primary Citation of Related Structures:  
    1E6K, 1E6L, 1E6M, 1UDR

  • PubMed Abstract: 

    The signal transduction protein CheY displays an alpha/beta-parallel polypeptide folding, including a highly unstable helix alpha4 and a strongly charged active site. Helix alpha4 has been shown to adopt various positions and conformations in different crystal structures, suggesting that it is a mobile segment. Furthermore, the instability of this helix is believed to have functional significance because it is involved in protein-protein contacts with the transmitter protein kinase CheA, the target protein FliM and the phosphatase CheZ. The active site of CheY comprises a cluster of three aspartic acid residues and a lysine residue, all of which participate in the binding of the Mg(2+) needed for the protein activation. Two steps were followed to study the activation mechanism of CheY upon phosphorylation: first, we independently substituted the three aspartic acid residues in the active site with alanine; second, several mutations were designed in helix alpha 4, both to increase its level of stability and to improve its packing against the protein core. The structural and thermodynamic analysis of these mutant proteins provides further evidence of the connection between the active-site area and helix alpha 4, and helps to understand how small movements at the active site are transmitted and amplified to the protein surface.

  • Organizational Affiliation

    Institut de Biologia Molecular de Barcelona, CSIC, Jordi Girona 18-26, 08034, Barcelona, Spain.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CHEMOTAXIS PROTEIN CHEY128Escherichia coli K-12Mutation(s): 1 
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
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.8α = 90
b = 47.7β = 90
c = 54.1γ = 90
Software Package:
Software NamePurpose

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-09-21
    Type: Initial release
  • Version 1.1: 2012-11-28
    Changes: Database references, Derived calculations, Non-polymer description, Other, Source and taxonomy
  • Version 1.2: 2017-07-05
    Changes: Data collection
  • Version 1.3: 2019-09-18
    Changes: Data collection, Database references, Experimental preparation