Clinical emergence of a novel extended-spectrum variant deriving from the OXY-1 ß-lactamase.
Eur J Clin Microbiol Infect Dis
; 2024 Aug 22.
Article
em En
| MEDLINE
| ID: mdl-39172287
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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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article