Experimental Data Snapshot

  • Resolution: 1.64 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.192 

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This is version 1.2 of the entry. See complete history


X-ray analysis of the NMC-A beta-lactamase at 1.64-A resolution, a class A carbapenemase with broad substrate specificity.

Swaren, P.Maveyraud, L.Raquet, X.Cabantous, S.Duez, C.Pedelacq, J.D.Mariotte-Boyer, S.Mourey, L.Labia, R.Nicolas-Chanoine, M.H.Nordmann, P.Frere, J.M.Samama, J.P.

(1998) J Biol Chem 273: 26714-26721

  • DOI: https://doi.org/10.1074/jbc.273.41.26714
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The treatment of infectious diseases by penicillin and cephalosporin antibiotics is continuously challenged by the emergence and the dissemination of the numerous TEM and SHV mutant beta-lactamases with extended substrate profiles. These class A beta-lactamases nevertheless remain inefficient against carbapenems, the most effective antibiotics against clinically relevant pathogens. A new member of this enzyme class, NMC-A, was recently reported to hydrolyze at high rates, and hence destroy, all known beta-lactam antibiotics, including carbapenems and cephamycins. The crystal structure of NMC-A was solved to 1.64-A resolution, and reveals modifications in the topology of the substrate-binding site. While preserving the geometry of the essential catalytic residues, the active site of the enzyme presents a disulfide bridge between residues 69 and 238, and certain other structural differences compared with the other beta-lactamases. These unusual features in class A beta-lactamases involve amino acids that participate in enzyme-substrate interactions, which suggested that these structural factors should be related to the very broad substrate specificity of this enzyme. The comparison of the NMC-A structure with those of other class A enzymes and enzyme-ligand complexes, indicated that the position of Asn-132 in NMC-A provides critical additional space in the region of the protein where the poorer substrates for class A beta-lactamases, such as cephamycins and carbapenems, need to be accommodated.

  • Organizational Affiliation

    Groupe de Cristallographie Biologique, Institut de Pharmacologie et de Biologie Structurale, UPR 9062 CNRS, 205 route de Narbonne, F-31077 Toulouse CEDEX, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PROTEIN (IMIPENEM-HYDROLYSING BETA-LACTAMASE)265Enterobacter cloacaeMutation(s): 0 
Find proteins for P52663 (Enterobacter cloacae)
Explore P52663 
Go to UniProtKB:  P52663
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52663
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.64 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.192 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.69α = 90
b = 52.9β = 90
c = 67.47γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data reduction
CCP4model building
X-PLORmodel building
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-09-02
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance