1BUE

NMC-A CARBAPENEMASE FROM ENTEROBACTER CLOACAE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.64 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.192 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

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: 10.1074/jbc.273.41.26714
  • Primary Citation of Related Structures:  
    1BUE

  • 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 ...

    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.


    Related Citations: 
    • A Kinetic Study of NMC-A Beta-Lactamase, an Ambler Class A Carbapenemase Also Hydrolyzing Cephamycins
      Mariotte-Boyer, S., Nicolas-Chanoine, M.H., Labia, R.
      (1996) FEMS Microbiol Lett 143: 29
    • Analysis of a Carbapenem-Hydrolyzing Class A Beta-Lactamase from Enterobacter Cloacae and of its Lysr-Type Regulatory Protein
      Naas, T., Nordmann, P.
      (1994) Proc Natl Acad Sci U S A 91: 7693

    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.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (IMIPENEM-HYDROLYSING BETA-LACTAMASE)A265Enterobacter cloacaeMutation(s): 0 
Gene Names: nmcA
EC: 3.5.2.6
Find proteins for P52663 (Enterobacter cloacae)
Explore P52663 
Go to UniProtKB:  P52663
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
X-PLORrefinement
CCP4data scaling
CCP4phasing
X-PLORphasing

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