OXA-type carbapenemases.

@article{WaltherRasmussen2006OXAtypeC,
  title={OXA-type carbapenemases.},
  author={Jan Walther-Rasmussen and Niels H{\o}iby},
  journal={The Journal of antimicrobial chemotherapy},
  year={2006},
  volume={57 3},
  pages={
          373-83
        }
}
In recent years, the number of class D beta-lactamases with carbapenem-hydrolysing properties has increased substantially. Based on amino acid sequence identities, these class D or OXA-type carbapenemases are divided into eight distantly related groups, and they are only remotely related to other class D beta-lactamases. A putative ancestor to one of the plasmid-encoded OXA-type carbapenemases has been found. OXA-type carbapenemases are not integrated into integrons as gene cassettes like many… 
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Structures of the Class D Carbapenemases OXA-23 and OXA-146: Mechanistic Basis of Activity against Carbapenems, Extended-Spectrum Cephalosporins, and Aztreonam
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