Genetic determinants involved in the susceptibility of Pseudomonas aeruginosa to beta-lactam antibiotics.

Abstract:

:The resistome of P. aeruginosa for three β-lactam antibiotics, namely, ceftazidime, imipenem, and meropenem, was deciphered by screening a comprehensive PA14 mutant library for mutants with increased or reduced susceptibility to these antimicrobials. Confirmation of the phenotypes of all selected mutants was performed by Etest. Of the total of 78 confirmed mutants, 41 demonstrated a reduced susceptibility phenotype and 37 a supersusceptibility (i.e., altered intrinsic resistance) phenotype, with 6 mutants demonstrating a mixed phenotype, depending on the antibiotic. Only three mutants demonstrated reduced (PA0908) or increased (glnK and ftsK) susceptibility to all three antibiotics. Overall, the mutant profiles of susceptibility suggested distinct mechanisms of action and resistance for the three antibiotics despite their similar structures. More detailed analysis indicated important roles for novel and known β-lactamase regulatory genes, for genes with likely involvement in barrier function, and for a range of regulators of alginate biosynthesis.

authors

Alvarez-Ortega C,Wiegand I,Olivares J,Hancock RE,Martínez JL

doi

10.1128/AAC.00257-10

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

4159-67

issue

10

eissn

0066-4804

issn

1098-6596

pii

AAC.00257-10

journal_volume

54

pub_type

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