2Y87

Native VIM-7. Structural and computational investigations of VIM-7: Insights into the substrate specificity of VIM metallo-beta- lactamases


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.160 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural and Computational Investigations of Vim- 7: Insights Into the Substrate Specificity of Vim Metallo-Beta-Lactamases

Saradhi, P.Leiros, H.-K.S.Ahmad, R.Spencer, J.Leiros, I.Walsh, T.R.Sundsfjord, A.Samuelsen, O.

(2011) J.Mol.Biol. 411: 174

  • DOI: 10.1016/j.jmb.2011.05.035
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The presence of metallo-β-lactamases (MBLs) in many clinically important human bacterial pathogens limits treatment options, as these enzymes efficiently hydrolyze nearly all β-lactam antibiotics. VIM enzymes are among the most widely distributed MBL ...

    The presence of metallo-β-lactamases (MBLs) in many clinically important human bacterial pathogens limits treatment options, as these enzymes efficiently hydrolyze nearly all β-lactam antibiotics. VIM enzymes are among the most widely distributed MBLs, but many of the individual VIM subtypes remain poorly characterized. Pseudomonas aeruginosa VIM-7 is the most divergent among VIM-type MBLs in terms of amino acid sequence. Here we present crystal structures of VIM-7 as the native enzyme, with Cys221 oxidized (VIM-7-Ox), and with a sulfur atom bridging the two active-site zinc ions (VIM-7-S). Comparison with VIM-2 and VIM-4 structures suggests an explanation for the reduced catalytic efficiency of VIM-7 against cephalosporins with a positively charged cyclic substituent at the C3 position (e.g., ceftazidime). Kinetic variations are attributed to substitutions in residues 60-66 (that form a loop adjacent to the active site previously implicated in substrate binding) and to the disruption of two hydrogen-bonding clusters through substitutions at positions 218 and 224. Furthermore, the less negatively charged surface of VIM-7 (compared to VIM-2) may also contribute to the reduced hydrolytic efficiency. Docking of the cephalosporins ceftazidime and cefotaxime into the VIM-2 and VIM-7 structures reveals that amino acid substitutions may cause the mode of substrate binding to differ between the two enzymes. Our structures thus provide new insights into the variation in substrate specificity that is evident across this family of clinically important enzymes.


    Organizational Affiliation

    Research Group for Host-Microbe Interactions, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, Tromsø, Norway.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
METALLO-B-LACTAMASE
A
265Pseudomonas aeruginosaMutation(s): 0 
Gene Names: blaVIM-7
Find proteins for Q840P9 (Pseudomonas aeruginosa)
Go to UniProtKB:  Q840P9
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
UNX
Query on UNX

Download SDF File 
Download CCD File 
A
UNKNOWN ATOM OR ION
X
*
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.160 
  • Space Group: P 43
Unit Cell:
Length (Å)Angle (°)
a = 70.399α = 90.00
b = 70.399β = 90.00
c = 47.562γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
REFMACrefinement
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-06-15
    Type: Initial release
  • Version 1.1: 2011-08-31
    Type: Database references, Version format compliance