1CHD

CHEB METHYLESTERASE DOMAIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • 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


Literature

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: 10.1006/jmbi.1995.0376
  • Primary Citation of Related Structures:  
    1CHD

  • 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 ...

    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.


    Related Citations: 
    • Purification, Crystallization, and Preliminary X-Ray Diffraction Analyses of the Bacterial Chemotaxis Receptor Modifying Enzymes
      West, A.H., Djordjevic, S., Martinez-Hackert, E., Stock, A.M.
      () To be published --: --
    • Evidence that the Methylesterase of Bacterial Chemotaxis May be a Serine Hydrolase
      Krueger, J.K., Stock, J., Schutt, C.E.
      (1992) Biochim Biophys Acta 1119: 322
    • Bacterial Chemotaxis and the Molecular Logic of Intracellular Signal Transduction Networks
      Stock, J.B., Lukat, G.S., Stock, A.M.
      (1991) Annu Rev Biophys Biophys Chem 20: 109
    • Multiple Forms of the Cheb Methylesterase in Bacterial Chemosensing
      Simms, S.A., Keane, M.G., Stock, J.
      (1985) J Biol Chem 260: 10161

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CHEB METHYLESTERASEA203Salmonella enterica subsp. enterica serovar Typhimurium str. LT2Mutation(s): 0 
Gene Names: cheBSTM1917
EC: 3.1.1.61 (PDB Primary Data), 3.5.1.44 (UniProt)
UniProt
Find proteins for P04042 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P04042 
Go to UniProtKB:  P04042
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
PROLSQrefinement
X-PLORrefinement
X-PLORphasing

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