| Conjugal mobilization of the mega element carrying mef(E) from Streptococcus salivarius to Streptococcus pneumoniae. | |
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MedLine Citation:
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PMID: 19025575 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We report the isolation and characterization of an unusual strain of Streptococcus salivarius, 3C30, displaying both the macrolide-lincosamide-streptogramin B and the tetracycline resistance phenotypes. It harbours the mef(E), erm(B), and tet(M) genes carried by different genetic elements. The genetic element carrying mef(E), named mega, was investigated by long PCR and sequencing, while the presence of the Tn3872-like element, carrying tet(M) and erm(B), was demonstrated by sequencing of both the int-xis-Tn and the fragment between the two resistance genes. In strain 3C30 the mega element is 5388 bp in size and its nucleotide sequence is identical to that of the element described previously in S. salivarius, with the exception of a 912 bp deletion at the left end. The composite Tn3872-like element appeared to be nonconjugative while the mega element was transferred by conjugation to Streptococcus pneumoniae. It was, however, impossible to transfer it again from these transconjugants to other strains. In addition, only in the 3C30 strain did mega form circular structures, as identified by real-time PCR. In conclusion, we found a clinical strain of S. salivarius carrying both mega and Tn3872-like genetic elements. Mega is transferable by conjugation to S. pneumoniae but it is not transferable again from the transconjugants, suggesting a possible mobilization by recombinases of the coresident Tn3872-like transposon. |
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Authors:
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Maria Santagati; Agnese Lupo; Marina Scillato; Andrea Di Martino; Stefania Stefani |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-11-14 |
Journal Detail:
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Title: FEMS microbiology letters Volume: 290 ISSN: 0378-1097 ISO Abbreviation: FEMS Microbiol. Lett. Publication Date: 2009 Jan |
Date Detail:
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Created Date: 2008-12-03 Completed Date: 2009-01-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7705721 Medline TA: FEMS Microbiol Lett Country: England |
Other Details:
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Languages: eng Pagination: 79-84 Citation Subset: IM |
Affiliation:
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Department of Microbiological Science, University of Catania, Catania, Italy. |
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| MeSH Terms | |
Descriptor/Qualifier:
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Anti-Bacterial Agents
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pharmacology* Bacterial Proteins / genetics Child, Preschool Conjugation, Genetic* DNA Transposable Elements* Drug Resistance, Bacterial* Gene Transfer, Horizontal Humans Macrolides / pharmacology* Microbial Sensitivity Tests Streptococcus / classification, drug effects, genetics*, isolation & purification Streptococcus pneumoniae / drug effects, genetics* Tetracycline Resistance |
| Chemical | |
Reg. No./Substance:
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0/Anti-Bacterial Agents; 0/Bacterial Proteins; 0/DNA Transposable Elements; 0/Macrolides |
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