title: Biochemical characterization of PER-2 and genetic environment of blaPER-2.
abstract: PER-2 was the first detected and the second most prevalent extended-spectrum beta-lactamase in clinical pathogens isolated in Argentina and was also reported only in other South American countries. Citrobacter freundii 33587 was isolated in 1999 in Buenos Aires and was resistant to all tested beta-lactams except cephamycins and carbapenems. The strain produced both plasmid-borne TEM-1 and PER-2 (pI 5.4), which could be transferred by conjugation. By PCR screening, thermal asymmetric interlaced PCR, and DNA sequencing, we detected an ISPa12/IS1387a insertion sequence upstream of bla(PER-2), previously reported as also being associated with bla(PER-1). The presence of similar structures upstream of bla(PER-1) and bla(PER-2) suggests a common origin and mobilization. Compared to bla(PER-1) genes, an additional putative promoter for bla(PER-2) was found. PER-2 kinetic analysis showed its high hydrolysis efficiencies toward both CTX and CAZ (k(cat)/K(m), 0.76 and 0.43 microM(-1).s(-1), respectively).
authors: Cátedra de Microbiología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina.
authors: Pablo
authors: P
authors: Power
authors: José
authors: J
authors: Di Conza
authors: María Margarita
authors: MM
authors: Rodríguez
authors: Bárbara
authors: B
authors: Ghiglione
authors: Juan A
authors: JA
authors: Ayala
authors: José María
authors: JM
authors: Casellas
authors: Marcela
authors: M
authors: Radice
authors: Gabriel
authors: G
authors: Gutkind
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002384:Catalysis; D016971:Citrobacter freundii / Q000235:genetics / Q000302:isolation & purification; D003227:Conjugation, Genetic; D004269:DNA, Bacterial / Q000032:analysis / Q000235:genetics; D004274:DNA, Recombinant; D004755:Enterobacteriaceae / Q000201:enzymology* / Q000302:isolation & purification; D005798:Genes, Bacterial / Q000235:genetics*; D006801:Humans; D006868:Hydrolysis; D007525:Isoelectric Focusing; D007700:Kinetics; D013058:Mass Spectrometry; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010957:Plasmids; D016133:Polymerase Chain Reaction; D011401:Promoter Regions, Genetic; D011487:Protein Conformation; D021382:Protein Sorting Signals; D017422:Sequence Analysis, DNA; D018440:beta-Lactam Resistance; D001618:beta-Lactamases / Q000737:chemistry* / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D004269:DNA, Bacterial; D004274:DNA, Recombinant; D021382:Protein Sorting Signals; C509814:beta-lactamase PER-2, Enterobacteriaceae; D001618:beta-Lactamases