Dataset Information

Macrolide-lincosamide-streptogramin B resistance in Staphylococcus lentus results from the integration of part of a transposon into a small plasmid.

ABSTRACT: The 8.0-kb macrolide-lincosamide-streptogramin B resistance plasmid pSES20 from Staphylococcus lentus harbored part of a Tn917-like transposon including the left terminal repeat, a gene almost identical to ermB, and its regulatory region, as well as the internal direct repeat. Homology between pSES20 and Tn917 ended at a sequence closely related to those of the resolution sites of Tn917 and Tn552 and staphylococcal recombination sites.

SUBMITTER: Werckenthin C

PROVIDER: S-EPMC163506 | biostudies-other | 1996 Sep

REPOSITORIES: biostudies-other

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Macrolide-lincosamide-streptogramin B resistance in Staphylococcus lentus results from the integration of part of a transposon into a small plasmid.

Werckenthin C C Schwarz S S Dyke K K

Antimicrobial agents and chemotherapy 19960901 9

The 8.0-kb macrolide-lincosamide-streptogramin B resistance plasmid pSES20 from Staphylococcus lentus harbored part of a Tn917-like transposon including the left terminal repeat, a gene almost identical to ermB, and its regulatory region, as well as the internal direct repeat. Homology between pSES20 and Tn917 ended at a sequence closely related to those of the resolution sites of Tn917 and Tn552 and staphylococcal recombination sites. ...[more]

PMID: 8878614

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Project description:BackgroundSolithromycin, the fourth generation of ketolides, has been demonstrated potent antibacterial effect against commonly-isolated gram-positive strains. However, Staphylococcus aureus (S. aureus) strains with a higher solithromycin MIC have already been emerged, the mechanism of which is unknown.MethodsAntimicrobial susceptibility test was performed on 266 strains of S. aureus. The antibiotic resistance phenotype of erm-positive strain was determined by D-zone test. Spontaneous mutation frequency analysis was performed to compare the risk levels for solithromycin resistance among different strains. Efflux pumps and mutational analysis of ribosomal fragments as well as erm(B) gene domains were detected. Quantitative reverse transcription polymerase chain reaction was conducted to compare the transcriptional expression of the erm gene between the constitutive macrolide-lincosamide-streptogramin B (cMLSB)- and inducible MLSB (iMLSB)-phenotypes.ResultsIn the erm-positive S. aureus strains, the minimum inhibitory concentration (MIC)50/90 of solithromycin (2/> 16 mg/L) was significantly higher than that in the erm-negative strains (0.125/0.25 mg/L). Of note, the MIC50 value of the strains with iMLSB (0.25 mg/L) was significantly lower than that of the strains with cMLSB (4 mg/L). A comparison among strains demonstrated that the median mutational frequency in isolates with cMLSB (> 1.2 × 10- 4) was approximately > 57-fold and > 3333-fold higher than that in iMLSB strains (2.1 × 10- 6) and in erythromycin-sensitive strains (3.6 × 10- 8), respectively. The differential antibiotic in vitro activity against strains between cMLSB and iMLSB could not be explained by efflux pump carriers or genetic mutations in the test genes. The expression of the erm genes in strains with cMLSB did not differ from that in strains with iMLSB.ConclusionsThe reduced susceptibility to solithromycin by S. aureus was associated with the cMLSB resistance phenotype mediated by erm.

Dataset Information

Macrolide-lincosamide-streptogramin B resistance in Staphylococcus lentus results from the integration of part of a transposon into a small plasmid.

Publications

Macrolide-lincosamide-streptogramin B resistance in Staphylococcus lentus results from the integration of part of a transposon into a small plasmid.

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