Clinical emergence of a novel extended-spectrum variant deriving from the OXY-1 β-lactamase

Hong Tuan Ha AS, Mammeri A, Plainvert C, Charfi R, Poyart C, Tazi A, Mammeri H

European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology, 2024

Abstract

The genomic comparison of two Klebsiella michiganensis clinical isolates recovered from the same patient, one resistant to piperacillin-tazobactam and intermediate to cefotaxime, the other resistant to ceftazidime but susceptible to piperacillin-tazobactam, revealed one mutation in the blaOXY-1-24 gene accounting for a L169M substitution in the Ω loop. Cloning experiment in Escherichia coli demonstrated the contribution of this mutation to the hydrolysis spectrum extension towards ceftazidime and cefepime, whereas the resistance to piperacillin-tazobactam was reduced. To the best of our knowledge, this study shows for the first time that ceftazidime resistance can occur in vivo from OXY-1 precursor by structural alteration.

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