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© Mélanie Falord, Tarek Msadek, Jean-Marc Panaud
Staphylococcus aureus "golden staph" in scanning electron microscopy.
Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Molecular microbiology - 18 Dec 2008

Brochet M, Da Cunha V, Couvé E, Rusniok C, Trieu-Cuot P, Glaser P

Link to Pubmed [PMID] – 19183283

Mol. Microbiol. 2009 Feb;71(4):948-59

We describe in Streptococcus agalactiae an atypical family of conjugative transposons named TnGBSs which associates DDE transposition and conjugation. We present evidence that the transposition of TnGBS2, the prototype of this family, is catalysed by a new class of DDE transposases that are widespread in Gram-positive bacteria. Remarkably, transposition occurs in intergenic regions, 15 or 16 bp upstream the -35 sequence of promoters, minimizing the burden on the host cell and suggesting an association between transcription and transposition. Transposition catalyses the formation of a circular intermediate that is substrate for subsequent conjugative intercellular transfer. Conjugation is initiated at an origin of transfer by a transposon-encoded relaxase. Whereas all integrative and conjugative elements described so far encode a phage-related integrase, TnGBS2 is the first example of conjugative transposon whose recombination is mediated by a DDE transposase. The combination of DDE transposition with conjugation implies recombination constraints linked to the physical separation of donor and recipient molecules.

http://www.ncbi.nlm.nih.gov/pubmed/19183283