5CGS

CRYSTAL STRUCTURE OF Fox-4 cephamycinase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.202 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

FOX-4 cephamycinase: an analysis of structure and function.

Lefurgy, S.T.Malashkevich, V.N.Aguilan, J.T.Nieves, E.Mundorff, E.C.Biju, B.Noel, M.A.Toro, R.Baiwir, D.Papp-Wallace, K.M.Almo, S.C.Frere, J.M.Bou, G.Bonomo, R.A.

(2015) Antimicrob Agents Chemother 

  • DOI: 10.1128/AAC.01887-15
  • Primary Citation of Related Structures:  
    5CGS, 5CGW, 5CGX

  • PubMed Abstract: 
  • Class C β-lactamases poorly hydrolyze cephamycins (e.g., cefoxitin, cefotetan, and moxalactam). In the past 2 decades, a new family of plasmid-based AmpC β-lactamases conferring resistance to cefoxitin, the FOX family, has grown to include nine unique members descended from the Aeromonas caviae chromosomal AmpC ...

    Class C β-lactamases poorly hydrolyze cephamycins (e.g., cefoxitin, cefotetan, and moxalactam). In the past 2 decades, a new family of plasmid-based AmpC β-lactamases conferring resistance to cefoxitin, the FOX family, has grown to include nine unique members descended from the Aeromonas caviae chromosomal AmpC. To understand the basis for the unique cephamycinase activity in the FOX family, we determined the first X-ray crystal structures of FOX-4, apo enzyme and the acyl-enzyme with its namesake compound, cefoxitin, using the Y150F deacylation-deficient variant. Notably, recombinant expression of N-terminally tagged FOX-4 also yielded an inactive adenylylated enzyme form not previously observed in β-lactamases. The posttranslational modification (PTM), which occurs on the active site Ser64, would not seem to provide a selective advantage, yet might present an opportunity for the design of novel antibacterial drugs. Substantial ligand-induced changes in the enzyme are seen in the acyl-enzyme complex, particularly the R2 loop and helix H10 (P289 to N297), with movement of F293 by 10.3 Å. Taken together, this study provides the first picture of this highly proficient class C cephamycinase, uncovers a novel PTM, and suggests a possible cephamycin resistance mechanism involving repositioning of the substrate due to the presence of S153P, N289P, and N346I substitutions in the ligand binding pocket.


    Organizational Affiliation

    Research Service, Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, Ohio, USA Department of Medicine, Case Western Reserve University, Cleveland, Ohio, USA Department of Pharmacology, Case Western Reserve University, Cleveland, Ohio, USA Department of Molecular Biology and Microbiology, Case Western Reserve University, Cleveland, Ohio, USA Department of Biochemistry, Case Western Reserve University, Cleveland, Ohio, USA robert.bonomo@va.gov.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-lactamaseA362Escherichia coliMutation(s): 0 
Gene Names: fox-4
EC: 3.5.2.6
UniProt
Find proteins for Q9L387 (Escherichia coli)
Explore Q9L387 
Go to UniProtKB:  Q9L387
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9L387
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.202 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.854α = 90
b = 57.085β = 96.45
c = 56.747γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
MOSFLMdata reduction
PHASERphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-02-03
    Type: Initial release