Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Work: 0.179 

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This is version 1.4 of the entry. See complete history


Crystal structures of CheY from Thermotoga maritima do not support conventional explanations for the structural basis of enhanced thermostability.

Usher, K.C.de la Cruz, A.F.Dahlquist, F.W.Swanson, R.V.Simon, M.I.Remington, S.J.

(1998) Protein Sci 7: 403-412

  • DOI: https://doi.org/10.1002/pro.5560070221
  • Primary Citation of Related Structures:  
    1TMY, 2TMY, 3TMY, 4TMY

  • PubMed Abstract: 

    The crystal structure of CheY protein from Thermotoga maritima has been determined in four crystal forms with and without Mg++ bound, at up to 1.9 A resolution. Structural comparisons with CheY from Escherichia coli shows substantial similarity in their folds, with some concerted changes propagating away from the active site that suggest how phosphorylated CheY, a signal transduction protein in bacterial chemotaxis, is recognized by its targets. A highly conserved segment of the protein (the "y-turn loop," residues 55-61), previously suggested to be a rigid recognition determinant, is for the first time seen in two alternative conformations in the different crystal structures. Although CheY from Thermotoga has much higher thermal stability than its mesophilic counterparts, comparison of structural features previously proposed to enhance thermostability such as hydrogen bonds, ion pairs, compactness, and hydrophobic surface burial would not suggest it to be so.

  • Organizational Affiliation

    Institute of Molecular Biology and Department of Chemistry, University of Oregon, Eugene 97403, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
120Thermotoga maritimaMutation(s): 0 
Gene Names: CHEY
Find proteins for Q56312 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q56312 
Go to UniProtKB:  Q56312
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ56312
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Work: 0.179 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.066α = 90
b = 50.066β = 90
c = 186.29γ = 90
Software Package:
Software NamePurpose
SDMSdata reduction
SDMSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-12-03
    Type: Initial release
  • Version 1.1: 2008-03-25
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-09
    Changes: Database references, Derived calculations, Refinement description
  • Version 1.4: 2024-05-22
    Changes: Data collection