Characterization of OXA-181, a Carbapenem-Hydrolyzing Class D β-Lactamase from Klebsiella pneumoniae

Abstract

ABSTRACTKlebsiella pneumoniaeKP3 was isolated from a patient transferred from India to the Sultanate of Oman.K. pneumoniaeKP3 was resistant to all β-lactams, including carbapenems, and expressed the carbapenem-hydrolyzing β-lactamase OXA-181, which differs from OXA-48 by four amino acid substitutions. Compared to OXA-48, OXA-181 possessed a very similar hydrolytic profile. TheblaOXA-181gene was located on a 7.6-kb ColE-type plasmid and was linked to the insertion sequence ISEcp1. The ISEcp1-mediated one-ended transposition ofblaOXA-181was also demonstrated.