6P99

OXA-48 carbapanemase, ertapenem complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.202 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Structural Insights into the Mechanism of Carbapenemase Activity of the OXA-48 beta-Lactamase.

Smith, C.A.Stewart, N.K.Toth, M.Vakulenko, S.B.

(2019) Antimicrob Agents Chemother 63

  • DOI: 10.1128/AAC.01202-19
  • Primary Citation of Related Structures:  
    6P96, 6P97, 6P98, 6P99, 6P9C

  • PubMed Abstract: 
  • Carbapenem-hydrolyzing class D carbapenemases (CHDLs) are enzymes that produce resistance to the last-resort carbapenem antibiotics, severely compromising the available therapeutic options for the treatment of life-threatening infections. A broad variety of CHDLs, including OXA-23, OXA-24/40, and OXA-58, circulate in Acinetobacter baumannii , while the OXA-48 CHDL is predominant in Enterobacteriaceae Extensive structural studies of A ...

    Carbapenem-hydrolyzing class D carbapenemases (CHDLs) are enzymes that produce resistance to the last-resort carbapenem antibiotics, severely compromising the available therapeutic options for the treatment of life-threatening infections. A broad variety of CHDLs, including OXA-23, OXA-24/40, and OXA-58, circulate in Acinetobacter baumannii , while the OXA-48 CHDL is predominant in Enterobacteriaceae Extensive structural studies of A. baumannii enzymes have provided important information regarding their interactions with carbapenems and significantly contributed to the understanding of the mechanism of their carbapenemase activity. However, the interactions between carbapenems and OXA-48 have not yet been elucidated. We determined the X-ray crystal structures of the acyl-enzyme complexes of OXA-48 with four carbapenems, imipenem, meropenem, ertapenem, and doripenem, and compared them with those of known carbapenem complexes of A. baumannii CHDLs. In the A. baumannii enzymes, acylation by carbapenems triggers significant displacement of one of two conserved hydrophobic surface residues, resulting in the formation of a channel for entry of the deacylating water into the active site. We show that such a channel preexists in apo-OXA-48 and that only minor displacement of the conserved hydrophobic surface residues occurs upon the formation of OXA-48 acyl-enzyme intermediates. We also demonstrate that the extensive hydrophobic interactions that occur between a conserved hydrophobic bridge of the A. baumannii CHDLs and the carbapenem tails are lost in OXA-48 in the absence of an equivalent bridge structure. These data highlight significant differences between the interactions of carbapenems with OXA-48 and those with A. baumannii enzymes and provide important insights into the mechanism of carbapenemase activity of the major Enterobacteriaceae CHDL, OXA-48.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana, USA csmith@slac.stanford.edu svakulen@nd.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-lactamaseA, B265Klebsiella pneumoniaeMutation(s): 0 
Gene Names: bla OXA-48blaOXA-48KPE71T_00045bla_4SAMEA3727643_05844
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
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1RG (Subject of Investigation/LOI)
Query on 1RG

Download Ideal Coordinates CCD File 
C [auth A](4R,5S)-3-({(3S,5S)-5-[(3-carboxyphenyl)carbamoyl]pyrrolidin-3-yl}sulfanyl)-5-[(1S,2R)-1-formyl-2-hydroxypropyl]-4-methyl-4,5-dihydro-1H-pyrrole-2-carboxylic acid
C22 H27 N3 O7 S
PGRRQYXTRXQDDJ-SKHPLXCOSA-N
 Ligand Interaction
CD
Query on CD

Download Ideal Coordinates CCD File 
H [auth A],
I [auth A],
J [auth A]
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
L [auth B]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A],
K [auth B]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.202 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.883α = 90
b = 76.822β = 90
c = 101.247γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
Aimlessdata scaling
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: 2019-08-07
    Type: Initial release
  • Version 1.1: 2019-10-09
    Changes: Data collection, Database references