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- W2167789296 abstract "ABSTRACT Klebsiella pneumoniae ORI-1 was isolated in 1998 in France from a rectal swab of a 1-month-old girl who was previously hospitalized in Cayenne Hospital, Cayenne, French Guiana. This strain harbored a ca. 140-kb nontransferable plasmid, pTK1, that conferred an extended-spectrum cephalosporin resistance profile antagonized by the addition of clavulanic acid, tazobactam, or imipenem. The gene for GES-1 (Guiana extended-spectrum β-lactamase) was cloned, and its protein was expressed in Escherichia coli DH10B, where this pI-5.8 β-lactamase of a ca. 31-kDa molecular mass conferred resistance to oxyimino cephalosporins (mostly to ceftazidime). GES-1 is weakly related to the other plasmid-located Ambler class A extended-spectrum β-lactamases (ESBLs). The highest percentage of amino acid identity was obtained with the carbenicillinase GN79 from Proteus mirabilis ; with YENT, a chromosome-borne penicillinase from Yersinia enterocolitica ; and with L-2, a chromosome-borne class A cephalosporinase from Stenotrophomonas maltophilia (36% amino acid identity each). However, a dendrogram analysis showed that GES-1 clustered within a class A ESBL subgroup together with ESBLs VEB-1 and PER-1. Sequencing of a 7,098-bp DNA fragment from plasmid pTK1 revealed that the GES-1 gene was located on a novel class 1 integron named In52 that was characterized by (i) a 5′ conserved segment containing an intI1 gene possessing two putative promoters, P 1 and P 2 , for coordinated expression of the downstream antibiotic resistance genes and an attI1 recombination site; (ii) five antibiotic gene cassettes, bla GES-1 , aac(6′)Ib ′ (gentamicin resistance and amikacin susceptibility), dfrXVb (trimethoprim resistance), a novel chloramphenicol resistance gene ( cmlA4 ), and aadA2 (streptomycin-spectinomycin resistance); and (iii) a 3′ conserved segment consisting of qacEΔ1 and sulI . The bla GES-1 and aadA2 gene cassettes were peculiar, since they lacked a typical 59-base element. This work identified the second class A ESBL gene of a non-TEM, non-SHV series which was located in the plasmid and integron, thus providing it additional means for its spread and its expression." @default.
- W2167789296 created "2016-06-24" @default.
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- W2167789296 date "2000-03-01" @default.
- W2167789296 modified "2023-10-18" @default.
- W2167789296 title "Biochemical Sequence Analyses of GES-1, a Novel Class A Extended-Spectrum β-Lactamase, and the Class 1 Integron In52 from <i>Klebsiella pneumoniae</i>" @default.
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- W2167789296 doi "https://doi.org/10.1128/aac.44.3.622-632.2000" @default.
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