Insights into the activity of cefiderocol against PER-2 producing Enterobacterales.

Antimicrob Agents Chemother

Universidad de Buenos Aires, Instituto de Investigaciones en Bacteriología y Virología Molecular (IBaViM), Buenos Aires, Argentina.

Published: June 2024

The PER-2 β-lactamase is a unique class A enzyme conferring broad spectrum cephalosporin resistance. In this study, we explored the stability of cefiderocol (FDC) against PER-2 β-lactamase to gain insights into structure activity relationships (SAR) of this synthetic siderophore-conjugated antibiotic. Herein, we show that the MICs of FDC for PER-2 producing isolates and transformants ranged between 0.125 and 64 µg/mL; diazabicyclooctanes (DBOs) reduced the MIC values. In PER-2 mutants, MIC values decreased up to 10-12 dilutions in agreement with previous observations especially in the case of Arg220 substitutions. Catalytic efficiency for PER-2 was 0.072 µM s, comparable with PER-1 (0.046 µM s) and NDM-1 (0.067 µM s). models revealed that FDC within the active site of PER-2 demonstrates unique interactions as a result of the inverted Ω loop fold and extension of the β3-β4 connecting loop.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11620487PMC
http://dx.doi.org/10.1128/aac.01720-23DOI Listing

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