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 

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


  • 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 ...

    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: 
    • 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.USA 91: 7693
    • 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


    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (IMIPENEM-HYDROLYSING BETA-LACTAMASE)
A
265Enterobacter cloacaeGene Names: nmcA
EC: 3.5.2.6
Find proteins for P52663 (Enterobacter cloacae)
Go to UniProtKB:  P52663
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.64 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.192 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 78.690α = 90.00
b = 52.900β = 90.00
c = 67.470γ = 90.00
Software Package:
Software NamePurpose
CCP4model building
X-PLORmodel building
MOSFLMdata reduction
CCP4phasing
X-PLORrefinement
CCP4data reduction
X-PLORphasing
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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