3QNC

Crystal Structure of a Rationally Designed OXA-10 Variant Showing Carbapenemase Activity, OXA-10loop48


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Evolution to carbapenem-hydrolyzing activity in noncarbapenemase class D {beta}-lactamase OXA-10 by rational protein design.

De Luca, F.Benvenuti, M.Carboni, F.Pozzi, C.Rossolini, G.M.Mangani, S.Docquier, J.D.

(2011) Proc Natl Acad Sci U S A 108: 18424-18429

  • DOI: https://doi.org/10.1073/pnas.1110530108
  • Primary Citation of Related Structures:  
    3QNB, 3QNC

  • PubMed Abstract: 

    Class D β-lactamases with carbapenemase activity are emerging as carbapenem-resistance determinants in gram-negative bacterial pathogens, mostly Acinetobacter baumannii and Klebsiella pneumoniae. Carbapenemase activity is an unusual feature among class D β-lactamases, and the structural elements responsible for this activity remain unclear. Based on structural and molecular dynamics data, we previously hypothesized a potential role of the residues located in the short-loop connecting strands β5 and β6 (the β5-β6 loop) in conferring the carbapenemase activity of the OXA-48 enzyme. In this work, the narrow-spectrum OXA-10 class D β-lactamase, which is unable to hydrolyze carbapenems, was used as a model to investigate the possibility of evolving carbapenemase activity by replacement of the β5-β6 loop with those present in three different lineages of class D carbapenemases (OXA-23, OXA-24, and OXA-48). Biological assays and kinetic measurements showed that all three OXA-10-derived hybrids acquired significant carbapenemase activity. Structural analysis of the OXA-10loop24 and OXA-10loop48 hybrids revealed no significant changes in the molecular fold of the enzyme, except for the orientation of the substituted β5-β6 loops, which was reminiscent of that found in their parental enzymes. These results demonstrate the crucial role of the β5-β6 loop in the carbapenemase activity of class D β-lactamases, and provide previously unexplored insights into the mechanism by which these enzymes can evolve carbapenemase activity.


  • Organizational Affiliation

    Dipartimento di Biotecnologie, Laboratorio di Fisiologia e Biotecnologia dei Microrganismi, Università di Siena, I-53100 Siena, Italy.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Oxacillinase
A, B
244Escherichia coli DH5[alpha]Mutation(s): 0 
Gene Names: blaOXA-10(loop48)
EC: 3.5.2.6
UniProt
Find proteins for Q7BNC2 (Escherichia coli)
Explore Q7BNC2 
Go to UniProtKB:  Q7BNC2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7BNC2
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
P [auth B],
Q [auth B],
R [auth B]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
EDO
Query on EDO

Download Ideal Coordinates CCD File 
I [auth A]
J [auth A]
K [auth A]
L [auth A]
M [auth A]
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
S [auth B],
T [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
CO2
Query on CO2

Download Ideal Coordinates CCD File 
O [auth A]CARBON DIOXIDE
C O2
CURLTUGMZLYLDI-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
KCX
Query on KCX
A, B
L-PEPTIDE LINKINGC7 H14 N2 O4LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.21α = 90
b = 97.01β = 90
c = 125.87γ = 90
Software Package:
Software NamePurpose
MxCuBEdata collection
MOLREPphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-11-02
    Type: Initial release
  • Version 1.1: 2013-07-24
    Changes: Database references
  • Version 1.2: 2017-07-26
    Changes: Refinement description, Source and taxonomy
  • Version 1.3: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.4: 2023-12-06
    Changes: Data collection