Broad antibiotic resistance profile of the subclass B3 metallo-beta-lactamase GOB-1, a di-zinc enzyme

Louise E. Horsfall, Youssef Izougarhane, Patricia Lassaux, Nathalie Selevsek, Benoit M. R. Lienard, Laurent Poirel, Michael B. Kupper, Kurt M. Hoffmann, Jean-Marie Frere, Moreno Galleni, Carine Bebrone

Research output: Contribution to journalArticlepeer-review

Abstract

The metallo-beta-lactamase (MBL) GOB-1 was expressed via a T7 expression system in Escherichia coli BL21(DE3). The MBL was purified to homogeneity and shown to exhibit a broad substrate profile, hydrolyzing all the tested beta-lactam compounds efficiently. The GOB enzymes are unique among MBLs due to the presence of a glutamine residue at position 116, a zinc-binding residue in all known class B1 and B3 MBL structures. Here we produced and studied the Q116A, Q116N and Q116H mutants. The substrate profiles were similar for each mutant, but with significantly reduced activity compared with that of the wild-type. In contrast to the Q116H enzyme, which bound two zinc ions just like the wild-type, only one zinc ion is present in Q116A and Q116N. These results suggest that the Q116 residue plays a role in the binding of the zinc ion in the QHH site.

Original languageEnglish
Pages (from-to)1252-1263
Number of pages12
JournalFebs Journal
Volume278
Issue number8
DOIs
Publication statusPublished - Apr 2011

Keywords

  • antibiotic resistance
  • GOB
  • metallo-β-lactamase
  • zinc-binding site
  • β-lactamase

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