8CUL

Xray ray crystal structure of OXA-24/40 in complex with CR167


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Sulfonamidoboronic Acids as "Cross-Class" Inhibitors of an Expanded-Spectrum Class C Cephalosporinase, ADC-33, and a Class D Carbapenemase, OXA-24/40: Strategic Compound Design to Combat Resistance in Acinetobacter baumannii .

Introvigne, M.L.Beardsley, T.J.Fernando, M.C.Leonard, D.A.Wallar, B.J.Rudin, S.D.Taracila, M.A.Rather, P.N.Colquhoun, J.M.Song, S.Fini, F.Hujer, K.M.Hujer, A.M.Prati, F.Powers, R.A.Bonomo, R.A.Caselli, E.

(2023) Antibiotics (Basel) 12

  • DOI: https://doi.org/10.3390/antibiotics12040644
  • Primary Citation of Related Structures:  
    8CUL, 8CUM, 8CUO, 8CUP, 8CUQ

  • PubMed Abstract: 

    Acinetobacter baumannii is a Gram-negative organism listed as an urgent threat pathogen by the World Health Organization (WHO). Carbapenem-resistant A. baumannii (CRAB), especially, present therapeutic challenges due to complex mechanisms of resistance to β -lactams. One of the most important mechanisms is the production of β -lactamase enzymes capable of hydrolyzing β -lactam antibiotics. Co-expression of multiple classes of β -lactamases is present in CRAB; therefore, the design and synthesis of "cross-class" inhibitors is an important strategy to preserve the efficacy of currently available antibiotics. To identify new, nonclassical β -lactamase inhibitors, we previously identified a sulfonamidomethaneboronic acid CR167 active against Acinetobacter -derived class C β -lactamases (ADC-7). The compound demonstrated affinity for ADC-7 with a K i = 160 nM and proved to be able to decrease MIC values of ceftazidime and cefotaxime in different bacterial strains. Herein, we describe the activity of CR167 against other β -lactamases in A. baumannii : the cefepime-hydrolysing class C extended-spectrum β -lactamase (ESAC) ADC-33 and the carbapenem-hydrolyzing OXA-24/40 (class D). These investigations demonstrate CR167 as a valuable cross-class (C and D) inhibitor, and the paper describes our attempts to further improve its activity. Five chiral analogues of CR167 were rationally designed and synthesized. The structures of OXA-24/40 and ADC-33 in complex with CR167 and select chiral analogues were obtained. The structure activity relationships (SARs) are highlighted, offering insights into the main determinants for cross-class C/D inhibitors and impetus for novel drug design.


  • Organizational Affiliation

    Department of Life Sciences, Università di Modena e Reggio Emilia, Via Campi 103, 41125 Modena, Italy.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-lactamase245Acinetobacter baumanniiMutation(s): 0 
Gene Names: blaOXA-33bla-OXA-40blaOXA-24blaOXA-40oxa-24oxa40SI89_16690
EC: 3.5.2.6
UniProt
Find proteins for Q8RLA6 (Acinetobacter baumannii)
Explore Q8RLA6 
Go to UniProtKB:  Q8RLA6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8RLA6
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
0N3 (Subject of Investigation/LOI)
Query on 0N3

Download Ideal Coordinates CCD File 
B [auth A]3-({[(dihydroxyboranyl)methyl]sulfamoyl}methyl)benzoic acid
C9 H12 B N O6 S
AHCSCYIPIIBZTG-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
KCX
Query on KCX
A
L-PEPTIDE LINKINGC7 H14 N2 O4LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.585α = 90
b = 102.585β = 90
c = 86.174γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
Aimlessdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR01AI072219

Revision History  (Full details and data files)

  • Version 1.0: 2023-04-05
    Type: Initial release
  • Version 1.1: 2023-10-25
    Changes: Data collection, Refinement description
  • Version 1.2: 2023-11-15
    Changes: Data collection
  • Version 1.3: 2024-05-01
    Changes: Database references