6PXX

Class D beta-lactamase in complex with beta-lactam antibiotic


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.172 
  • R-Value Work: 0.151 
  • R-Value Observed: 0.152 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Structural Analysis of The OXA-48 Carbapenemase Bound to A "Poor" Carbapenem Substrate, Doripenem.

Papp-Wallace, K.M.Kumar, V.Zeiser, E.T.Becka, S.A.van den Akker, F.

(2019) Antibiotics (Basel) 8

  • DOI: https://doi.org/10.3390/antibiotics8030145
  • Primary Citation of Related Structures:  
    6PXX

  • PubMed Abstract: 

    Carbapenem-resistant Enterobacteriaceae are a significant threat to public health, and a major resistance determinant that promotes this phenotype is the production of the OXA-48 carbapenemase. The activity of OXA-48 towards carbapenems is a puzzling phenotype as its hydrolytic activity against doripenem is non-detectable. To probe the mechanistic basis for this observation, we determined the 1.5 Å resolution crystal structure of the deacylation deficient K73A variant of OXA-48 in complex with doripenem. Doripenem is observed in the Δ 1 R and Δ 1 S tautomeric states covalently attached to the catalytic S70 residue. Likely due to positioning of residue Y211, the carboxylate moiety of doripenem is making fewer hydrogen bonding/salt-bridge interactions with R250 compared to previously determined carbapenem OXA structures. Moreover, the hydroxyethyl side chain of doripenem is making van der Waals interactions with a key V120 residue, which likely affects the deacylation rate of doripenem. We hypothesize that positions V120 and Y211 play important roles in the carbapenemase profile of OXA-48. Herein, we provide insights for the further development of the carbapenem class of antibiotics that could render them less effective to hydrolysis by or even inhibit OXA carbapenemases.


  • Organizational Affiliation

    Department of Biochemistry, Case Western Reserve University, Cleveland, OH 44106, USA. krisztina.papp@va.gov.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-lactamase
A, B
265Klebsiella pneumoniaeMutation(s): 1 
Gene Names: bla OXA-48blaOXA-48KPE71T_00045
EC: 3.5.2.6
UniProt
Find proteins for Q6XEC0 (Klebsiella pneumoniae)
Explore Q6XEC0 
Go to UniProtKB:  Q6XEC0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6XEC0
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
5R7 (Subject of Investigation/LOI)
Query on 5R7

Download Ideal Coordinates CCD File 
C [auth A],
I [auth B]
(2~{S},3~{R})-3-methyl-2-[(2~{S},3~{R})-3-oxidanyl-1-oxidanylidene-butan-2-yl]-4-[(3~{S},5~{S})-5-[(sulfamoylamino)meth yl]pyrrolidin-3-yl]sulfanyl-3,4-dihydro-2~{H}-pyrrole-5-carboxylic acid
C15 H26 N4 O6 S2
RBKUPZPTQNSPAV-QZOCKBNKSA-N
EPE
Query on EPE

Download Ideal Coordinates CCD File 
J [auth B]4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
EDO
Query on EDO

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A],
F [auth A],
G [auth A],
K [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
H [auth A],
L [auth B]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.172 
  • R-Value Work: 0.151 
  • R-Value Observed: 0.152 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.77α = 90
b = 125.092β = 90
c = 45.12γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PDB_EXTRACTdata extraction
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-09
    Type: Initial release
  • Version 1.1: 2024-11-20
    Changes: Data collection, Database references, Derived calculations, Structure summary