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

Power P,Di Conza J,Rodríguez MM,Ghiglione B,Ayala JA,Casellas JM,Radice M,Gutkind G

doi

10.1128/AAC.01395-06

subject

Has Abstract

pub_date

2007-07-01 00:00:00

pages

2359-65

issue

7

eissn

0066-4804

issn

1098-6596

pii

AAC.01395-06

journal_volume

51

pub_type

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