KPC Beta-Lactamases Are Permissive to Insertions and Deletions Conferring Substrate Spectrum Modifications and Resistance to Ceftazidime-Avibactam
Claire Amaris Hobson, Stéphane Bonacorsi, Hervé Jacquier, Alaksh Choudhury, Mélanie Magnan, Aurélie Cointe, Béatrice Berçot, Olivier Tenaillon, André Birgy
Abstract
carbapenemase (KPC) beta-lactamase, we selected for ceftazidime-avibactam-resistant mutants. Of 96 screened mutants, we obtained 19 indels (2 to 15 amino acids), all located in the loops surrounding the active site. Three antibiotic susceptibility phenotypes emerged: an extended-spectrum-beta-lactamase-like phenotype, an activity restricted to ceftazidime, and a carbapenem-susceptible KPC-like phenotype. Tolerance for indels reflects the evolvability of KPC beta-lactamase, which could challenge the therapeutic management of patients.
Topics & Concepts
Ceftazidime/avibactamKlebsiella pneumoniaeCeftazidimeBiologyMutantIndelMicrobiologyPhenotypeAntibioticsCarbapenemAvibactamGeneticsGeneBacteriaGenotypePseudomonas aeruginosaEscherichia coliSingle-nucleotide polymorphismAntibiotic Resistance in BacteriaGenomics and Phylogenetic StudiesPlant Pathogenic Bacteria Studies