1985
DOI: 10.1128/aac.28.2.302
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Evolution of plasmid-coded resistance to broad-spectrum cephalosporins

Abstract: A clinical isolate of Klebsiella ozaenae with transferable resistance to broad-spectrum cephalosporins produces a ,(-lactamase determined by plasmid pBP60. The P-lactamase had the same isoelectric point as SHV-1 (7.6). From heteroduplex analysis, an extensive homology between the two bla genes could be deduced; therefore, the new ,l-lactamase was designated SHV-2. Enzymatic studies revealed that SHV-2 was able to hydrolyze broad-spectrum cephalosporins due to an increased affinity of these compounds for the en… Show more

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Cited by 355 publications
(203 citation statements)
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“…Its substrate affinity for methoxyimino-cephalosporins but not cephamycins led to the assumption that it is another member of the emerging SHV p-lactamase family (Pitton, 1972;Kliebe et al, 1985;Jarlier et al, 1988;BurC et al, 1988;Gutmann et al, 1989); the hybridization and nucleotide sequence data presented above confirm this assumption. The small differences in the nucleotide sequence compared to the established SHV-2 sequence demonstrate that the new enzyme is a variant of this protein.…”
Section: Discussionsupporting
confidence: 52%
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“…Its substrate affinity for methoxyimino-cephalosporins but not cephamycins led to the assumption that it is another member of the emerging SHV p-lactamase family (Pitton, 1972;Kliebe et al, 1985;Jarlier et al, 1988;BurC et al, 1988;Gutmann et al, 1989); the hybridization and nucleotide sequence data presented above confirm this assumption. The small differences in the nucleotide sequence compared to the established SHV-2 sequence demonstrate that the new enzyme is a variant of this protein.…”
Section: Discussionsupporting
confidence: 52%
“…(1975) using TEM-1, TEM-2, PSE-1, PSE-2,OXA-l, SHV-1 and Enterobacter cloacae P99 chromosomal /. ?-lactamase as PI standards (Kliebe et al, 1985) and nitrocefin for visualization. Determination of specific CTX hydrolysis by single bands from IEF was carried out by cutting slabs containing these bands from the gel, placing them as a whole into the cuvette containing phosphate-buffered saline pH 7.2 and 75 ~M-CTX and performing the assays as described below.…”
Section: Methodsmentioning
confidence: 99%
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“…The first N-terminal amino acid degradations each yielded one residue with the sequence Ser-Pro-Gln-Pro-Leu-Glu-. Pure enzyme showed a specific activity of 600 U/mg and behaved as SHV-2 P-lactamase [7] in kinetic constants and analytical isoelectric focusing. The amino acid composition did not differ markedly from that of the SHV-1 protein [lo] and fitted well with that deduced from the amino acid sequence analysis.…”
Section: Resultsmentioning
confidence: 99%
“…The first report of transferrable resistance to cefotaxime in a few bacterial strains was published in 1983 [6]. Two years later, in one of these strains, the involvement of a plasmidmediated &lactamase capable of hydrolyzing cefotaxime and other third-generation cephalosporins was demonstrated [7]. This ,9-lactamase was named SHV-2, as it was closely related to a well-known SHV-1 enzyme, on the basis of biochemical studies and DNA hybridization.…”
Section: Introductionmentioning
confidence: 99%