Experimental Data Snapshot

  • Resolution: 1.75 Å
  • R-Value Free: 0.230 
  • R-Value Observed: 0.182 

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This is version 1.2 of the entry. See complete history


Crystal structure of the catalytic domain of the chemotaxis receptor methylesterase, CheB.

West, A.H.Martinez-Hackert, E.Stock, A.M.

(1995) J Mol Biol 250: 276-290

  • DOI: https://doi.org/10.1006/jmbi.1995.0376
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Signaling activity of bacterial chemotaxis transmembrane receptors is modulated by reversible covalent modification of specific receptor glutamate residues. The level of receptor methylation results from the activities of a specific S-adenosylmethionine-dependent methyltransferase, CheR, and the CheB methylesterase, which catalyzes hydrolysis of receptor glutamine or methylglutamate side-chains to glutamic acid. The CheB methylesterase belongs to a large family of response regulator proteins in which N-terminal regulatory domains control the activities of C-terminal effector domains. The crystal structure of the catalytic domain of the Salmonella typhimurium CheB methylesterase has been determined at 1.75 A resolution. The domain has a modified, doubly wound alpha/beta fold in which one of the helices is replaced by an anti-parallel beta-hairpin. Previous biochemical and mutagenesis data, suggest that the methylester hydrolysis catalyzed by CheB proceeds through a mechanism involving a serine nucleophile. The methylesterase active site is tentatively identified as a cleft at the C-terminal edge of the beta-sheet containing residues Ser164, His190 and Asp286. The three-dimensional fold, and the arrangement of residues within the catalytic triad distinguishes the CheB methylesterase from any previously described serine protease or serine hydrolase.

  • Organizational Affiliation

    Department of Biochemistry, University of Medicine and Dentistry, New Jersey-Robert Wood Johnson Medical School,Piscataway USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CHEB METHYLESTERASE203Salmonella enterica subsp. enterica serovar Typhimurium str. LT2Mutation(s): 0 
Gene Names: cheBSTM1917
EC: (PDB Primary Data), (UniProt)
Find proteins for P04042 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P04042 
Go to UniProtKB:  P04042
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04042
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.75 Å
  • R-Value Free: 0.230 
  • R-Value Observed: 0.182 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.38α = 90
b = 63.38β = 90
c = 87.01γ = 120
Software Package:
Software NamePurpose
ARP/wARPmodel building
X-PLORmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1996-01-29
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance