Structure of an Unusual S-adenosylmethionine synthetase from Campylobacter jejuni

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.224 

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This is version 1.3 of the entry. See complete history


Structure of an unusual S-adenosylmethionine synthetase from Campylobacter jejuni.

Zano, S.P.Pavlovsky, A.G.Viola, R.E.

(2014) Acta Crystallogr D Biol Crystallogr 70: 442-450

  • DOI: https://doi.org/10.1107/S139900471303023X
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    S-Adenosylmethionine (AdoMet) participates in a wide range of methylation and other group-transfer reactions and also serves as the precursor for two groups of quorum-sensing molecules that function as regulators of the production of virulence factors in Gram-negative bacteria. The synthesis of AdoMet is catalyzed by AdoMet synthetases (MATs), a ubiquitous family of enzymes found in species ranging from microorganisms to mammals. The AdoMet synthetase from the bacterium Campylobacter jejuni (cjMAT) is an outlier among this homologous enzyme family, with lower sequence identity, numerous insertions and substitutions, and higher catalytic activity compared with other bacterial MATs. Alterations in the structure of this enzyme provide an explanation for its unusual dimeric quaternary structure relative to the other MATs. Taken together with several active-site substitutions, this new structure provides insights into its improved kinetic properties with alternative substrates.

  • Organizational Affiliation

    Department of Chemistry, The University of Toledo, Toledo, OH 43606, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
S-adenosylmethionine synthetase
A, B
430Campylobacter jejuni RM1221Mutation(s): 0 
Gene Names: CJE1239metK
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.224 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.655α = 90
b = 113.075β = 116.49
c = 62.179γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-02-12
    Type: Initial release
  • Version 1.1: 2014-09-24
    Changes: Database references
  • Version 1.2: 2014-11-12
    Changes: Structure summary
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Refinement description