Molecular Organization of Small Plasmids Bearing bla TEM-1 and Conferring Resistance to β-Lactams in Haemophilus influenzae
Author(s) -
Annette Søndergaard,
Álvaro San Millán,
Alfonso Santos-López,
Signe Maria Nielsen,
Bruno GonzálezZorn,
Niels NørskovLauritsen
Publication year - 2012
Publication title -
antimicrobial agents and chemotherapy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.07
H-Index - 259
eISSN - 1070-6283
pISSN - 0066-4804
DOI - 10.1128/aac.00408-12
Subject(s) - plasmid , haemophilus influenzae , biology , amp resistance , genetics , microbiology and biotechnology , gene , bacteria
TEM-1 is the dominant β-lactamase of Haemophilus influenzae and can be located on small plasmids. Three distinct plasmids with sizes from 4,304 to 5,646 nucleotides (nt) were characterized: pA1606, pA1209, and pPN223. In addition to TEM-1 and a replication enzyme of the Rep 3 superfamily, pA1606 carries a Tn3 resolvase gene and pA1606 and pA1209 carry an open reading frame (ORF) similar to a plasmid recombination enzyme gene described in Gram-positive bacteria. The plasmids transformed strain Rd to the ampicillin-resistant phenotype.
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