5ZA2

Fox-4 beta-lactamase complexed with avibactam


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Probing the Mechanism of Inactivation of the FOX-4 Cephamycinase by Avibactam

Nukaga, M.Papp-Wallace, K.M.Hoshino, T.Lefurgy, S.T.Bethel, C.R.Barnes, M.D.Zeiser, E.T.Johnson, J.K.Bonomo, R.A.

(2018) Antimicrob Agents Chemother 62

  • DOI: 10.1128/AAC.02371-17
  • Primary Citation of Related Structures:  
    5ZA2

  • PubMed Abstract: 
  • Ceftazidime-avibactam is a "second-generation" β-lactam-β-lactamase inhibitor combination that is effective against Enterobacteriaceae expressing class A extended-spectrum β-lactamases, class A carbapenemases, and/or class C cephalosporinases. Knowledge of the interactions of avibactam, a diazabicyclooctane with different β-lactamases, is required to anticipate future resistance threats ...

    Ceftazidime-avibactam is a "second-generation" β-lactam-β-lactamase inhibitor combination that is effective against Enterobacteriaceae expressing class A extended-spectrum β-lactamases, class A carbapenemases, and/or class C cephalosporinases. Knowledge of the interactions of avibactam, a diazabicyclooctane with different β-lactamases, is required to anticipate future resistance threats. FOX family β-lactamases possess unique hydrolytic properties with a broadened substrate profile to include cephamycins, partly as a result of an isoleucine at position 346, instead of the conserved asparagine found in most AmpCs. Interestingly, a single amino acid substitution at N346 in the Citrobacter AmpC is implicated in resistance to the aztreonam-avibactam combination. In order to understand how diverse active-site topologies affect avibactam inhibition, we tested a panel of clinical Enterobacteriaceae isolates producing bla FOX using ceftazidime-avibactam, determined the biochemical parameters for inhibition using the FOX-4 variant, and probed the atomic structure of avibactam with FOX-4. Avibactam restored susceptibility to ceftazidime for most isolates producing bla FOX ; two isolates, one expressing bla FOX-4 and the other producing bla FOX-5 , displayed an MIC of 16 μg/ml for the combination. FOX-4 possessed a k 2 / K value of 1,800 ± 100 M -1 · s -1 and an off rate ( k off ) of 0.0013 ± 0.0003 s -1 Mass spectrometry showed that the FOX-4-avibactam complex did not undergo chemical modification for 24 h. Analysis of the crystal structure of FOX-4 with avibactam at a 1.5-Å resolution revealed a unique characteristic of this AmpC β-lactamase. Unlike in the Pseudomonas -derived cephalosporinase 1 (PDC-1)-avibactam crystal structure, interactions (e.g., hydrogen bonding) between avibactam and position I346 in FOX-4 are not evident. Furthermore, another residue is not observed to be close enough to compensate for the loss of these critical hydrogen-bonding interactions. This observation supports findings from the inhibition analysis of FOX-4; FOX-4 possessed the highest K d (dissociation constant) value (1,600 nM) for avibactam compared to other AmpCs (7 to 660 nM). Medicinal chemists must consider the properties of extended-spectrum AmpCs, such as the FOX β-lactamases, for the design of future diazabicyclooctanes.


    Organizational Affiliation

    Department of Pharmacology, Case Western Reserve University, Cleveland, Ohio, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-lactamaseA354Escherichia 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
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-lactamaseB355Escherichia coliMutation(s): 1 
Gene Names: fox-4
EC: 3.5.2.6
UniProt
Find proteins for Q9L387 (Escherichia coli)
Explore Q9L387 
Go to UniProtKB:  Q9L387
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NXL (Subject of Investigation/LOI)
Query on NXL

Download Ideal Coordinates CCD File 
C [auth A], H [auth B](2S,5R)-1-formyl-5-[(sulfooxy)amino]piperidine-2-carboxamide
C7 H13 N3 O6 S
WJDGWXPPFHLLNL-RITPCOANSA-N
 Ligand Interaction
EPE
Query on EPE

Download Ideal Coordinates CCD File 
G [auth A]4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
D [auth A], E [auth A], F [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
BL-PEPTIDE LINKINGC3 H8 N O6 PSER
Binding Affinity Annotations 
IDSourceBinding Affinity
NXL Binding MOAD:  5ZA2 Kd: 1700 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.391α = 90
b = 85.908β = 90
c = 144.227γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
DENZOdata reduction
SCALEPACKdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment  



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Japan Society for the Promotion of ScienceJapan26460534
United States Departtment of Veterans AffairsUnited StatesBX002872; BX001974
National Institutes of HealthUnited StatesR21AI114508, R01AI100560, R01AI063517, and R01AI072219

Revision History  (Full details and data files)

  • Version 1.0: 2018-03-07
    Type: Initial release
  • Version 1.1: 2018-05-09
    Changes: Data collection, Database references