4NET

Crystal structure of ADC-1 beta-lactamase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.157 

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This is version 1.1 of the entry. See complete history


Literature

Structure of the extended-spectrum class C beta-lactamase ADC-1 from Acinetobacter baumannii.

Bhattacharya, M.Toth, M.Antunes, N.T.Smith, C.A.Vakulenko, S.B.

(2014) Acta Crystallogr D Biol Crystallogr 70: 760-771

  • DOI: 10.1107/S1399004713033014
  • Primary Citation of Related Structures:  
    4NET

  • PubMed Abstract: 
  • ADC-type class C β-lactamases comprise a large group of enzymes that are encoded by genes located on the chromosome of Acinetobacter baumannii, a causative agent of serious bacterial infections. Overexpression of these enzymes renders A. baumannii resistant to various β-lactam antibiotics and thus severely compromises the ability to treat infections caused by this deadly pathogen ...

    ADC-type class C β-lactamases comprise a large group of enzymes that are encoded by genes located on the chromosome of Acinetobacter baumannii, a causative agent of serious bacterial infections. Overexpression of these enzymes renders A. baumannii resistant to various β-lactam antibiotics and thus severely compromises the ability to treat infections caused by this deadly pathogen. Here, the high-resolution crystal structure of ADC-1, the first member of this clinically important family of antibiotic-resistant enzymes, is reported. Unlike the narrow-spectrum class C β-lactamases, ADC-1 is capable of producing resistance to the expanded-spectrum cephalosporins, rendering them inactive against A. baumannii. The extension of the substrate profile of the enzyme is likely to be the result of structural differences in the R2-loop, primarily the deletion of three residues and subsequent rearrangement of the A10a and A10b helices. These structural rearrangements result in the enlargement of the R2 pocket of ADC-1, allowing it to accommodate the bulky R2 substituents of the third-generation cephalosporins, thus enhancing the catalytic efficiency of the enzyme against these clinically important antibiotics.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
AmpCA, B361Acinetobacter baumanniiMutation(s): 0 
Gene Names: ampC
EC: 3.5.2.6
UniProt
Find proteins for Q9L4R5 (Acinetobacter baumannii)
Explore Q9L4R5 
Go to UniProtKB:  Q9L4R5
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.157 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.073α = 90
b = 182.151β = 98.8
c = 50.373γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
MOLREPphasing
PHENIXrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-03-12
    Type: Initial release
  • Version 1.1: 2014-09-24
    Changes: Database references