Abstract
A novel PER-type extended-spectrum β-lactamase, PER-8, was identified in an Acinetobacter baumannii clinical isolate obtained in Nepal. The amino acid sequence of PER-8 has a substitution at position 39 (Gly to Glu) compared with that of PER-7. The kcat/Km ratio of PER-8 for aztreonam was lower than that of PER-7, while the kcat/Km ratio of PER-8 for imipenem was higher than that of PER-7. The genomic environment surrounding blaPER-8 was intI1 blaPSE-1qacEDI sulI ISCR1-blaPER-8gts sulI orfX on a 100-kb plasmid.
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