5MNU

OXA-10 Avibactam complex with bound bromide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.56 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

(13)C-Carbamylation as a mechanistic probe for the inhibition of class D beta-lactamases by avibactam and halide ions.

Lohans, C.T.Wang, D.Y.Jorgensen, C.Cahill, S.T.Clifton, I.J.McDonough, M.A.Oswin, H.P.Spencer, J.Domene, C.Claridge, T.D.W.Brem, J.Schofield, C.J.

(2017) Org. Biomol. Chem. 15: 6024-6032

  • DOI: 10.1039/c7ob01514c
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The class D (OXA) serine β-lactamases are a major cause of resistance to β-lactam antibiotics. The class D enzymes are unique amongst β-lactamases because they have a carbamylated lysine that acts as a general acid/base in catalysis. Previous crystal ...

    The class D (OXA) serine β-lactamases are a major cause of resistance to β-lactam antibiotics. The class D enzymes are unique amongst β-lactamases because they have a carbamylated lysine that acts as a general acid/base in catalysis. Previous crystallographic studies led to the proposal that β-lactamase inhibitor avibactam targets OXA enzymes in part by promoting decarbamylation. Similarly, halide ions are proposed to inhibit OXA enzymes via decarbamylation. NMR analyses, in which the carbamylated lysines of OXA-10, -23 and -48 were 13C-labelled, indicate that reaction with avibactam does not ablate lysine carbamylation in solution. While halide ions did not decarbamylate the 13C-labelled OXA enzymes in the absence of substrate or inhibitor, avibactam-treated OXA enzymes were susceptible to decarbamylation mediated by halide ions, suggesting halide ions may inhibit OXA enzymes by promoting decarbamylation of acyl-enzyme complex. Crystal structures of the OXA-10 avibactam complex were obtained with bromide, iodide, and sodium ions bound between Trp-154 and Lys-70. Structures were also obtained wherein bromide and iodide ions occupy the position expected for the 'hydrolytic water' molecule. In contrast with some solution studies, Lys-70 was decarbamylated in these structures. These results reveal clear differences between crystallographic and solution studies on the interaction of class D β-lactamases with avibactam and halides, and demonstrate the utility of 13C-NMR for studying lysine carbamylation in solution.


    Organizational Affiliation

    Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK. christopher.schofield@chem.ox.ac.uk jurgen.brem@chem.ox.ac.uk.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Beta-lactamase OXA-10
A, B
247Pseudomonas aeruginosaMutation(s): 0 
Gene Names: bla (oxa10, pse2)
EC: 3.5.2.6
Find proteins for P14489 (Pseudomonas aeruginosa)
Go to UniProtKB:  P14489
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

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A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
BR
Query on BR

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A, B
BROMIDE ION
Br
CPELXLSAUQHCOX-UHFFFAOYSA-M
 Ligand Interaction
NXL
Query on NXL

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A, B
(2S,5R)-1-formyl-5-[(sulfooxy)amino]piperidine-2-carboxamide
avibactam, bound form, NXL104, bound form
C7 H13 N3 O6 S
WJDGWXPPFHLLNL-RITPCOANSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.56 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.185 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 48.771α = 90.00
b = 101.421β = 90.00
c = 127.221γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-07-12
    Type: Initial release
  • Version 1.1: 2017-07-26
    Type: Database references