Université de Fribourg

Crystal structure of the Pseudomonas aeruginosa BEL-1 extended-spectrum β-lactamase and its complexes with moxalactam and imipenem

Pozzi, Cecilia ; Luca, Filomena De ; Benvenuti, Manuela ; Poirel, Laurent ; Nordmann, Patrice ; Rossolini, Gian Maria ; Mangani, Stefano ; Docquier, Jean-Denis

In: Antimicrobial Agents and Chemotherapy, 2016, vol. 60, no. 12, p. 7189–7199

BEL-1 is an acquired class A extended-spectrum β-lactamase (ESBL) found in Pseudomonas aeruginosa clinical isolates from Belgium which is divergent from other ESBLs (maximum identity of 54% with GES-type enzymes). This enzyme is efficiently inhibited by clavulanate, imipenem, and moxalactam. Crystals of BEL-1 were obtained at pH 5.6, and the structure of native BEL-1 was determined from...

Université de Fribourg

In vitro activity of ceftazidime, ceftaroline and aztreonam alone and in combination with avibactam against European Gram-negative and Gram-positive clinical isolates

Testa, Raymond ; Cantón, Rafael ; Giani, Tommaso ; Morosini, María-Isabel ; Nichols, Wright W. ; Seifert, Harald ; Stefanik, Danuta ; Rossolini, Gian Maria ; Nordmann, Patrice

In: International Journal of Antimicrobial Agents, 2015, vol. 45, no. 6, p. 641–646

Recent clinical isolates of key Gram-negative and Gram-positive bacteria were collected in 2012 from hospitalised patients in medical centres in four European countries (France, Germany, Italy and Spain) and were tested using standard broth microdilution methodology to assess the impact of 4 mg/L avibactam on the in vitro activities of ceftazidime, ceftaroline and aztreonam. Against...