Mobilization of "nonmobilizable" plasmids by the aggregation-mediated conjugation system of Bacillus thuringiensis

Plasmid
Lars AndrupG B Jensen

Abstract

The aggregation-mediated conjugation system of Bacillus thuringiensis subsp, israelensis (Bti), encoded by the 200-kb plasmid pXO16, is highly potent in transferring itself and efficient in mobilizing other nonconjugative plasmids. In the present study we have analyzed the native Bacillus cereus plasmid pBC16. This plasmid has previously been shown to harbor a mob gene (ORF beta) and a locus functioning as an oriT site in plasmid pLS20-mediated conjugation in Bacillus subtilis. However, in the conjugation system of Bti we found that a derivative of pBC16 deleted for both these loci was mobilizable, although at a reduced frequency. Another derivative of pBC16, containing a deletion spanning the first half of the coding region of the mob gene, was found to be nearly as mobilizable as the intact pBC16, suggesting its dispensability in the transfer process. Other plasmids based on the theta-replicating origins, pAM beta 1, pLS20, ori43, ori44, and ori60, were also consistently mobilized in the conjugation system encoded by Bti plasmid pXO16. Analyzing the conjugation process by the use of scanning electron microscopy revealed the presence of connections between cells in the mating mixtures. These connections did not appear in monoc...Continue Reading

Citations

Feb 3, 2009·Journal of Bacteriology·Sophie TimmeryJacques Mahillon
Jun 10, 2003·Microbiology and Molecular Biology Reviews : MMBR·Elisabeth GrohmannManuel Espinosa
Aug 16, 2006·Journal of Applied Microbiology·N J TourasseA-B Kolstø
May 25, 2013·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Ben Raymond, Michael B Bonsall
Sep 26, 2006·International Journal of Food Microbiology·Géraldine A Van der AuweraJacques Mahillon
Jul 12, 2005·International Journal of Food Microbiology·Gert B JensenLars Andrup
Apr 20, 2005·FEMS Microbiology Letters·Xiaomin HuGert Bolander Jensen
Jun 1, 2002·FEMS Microbiology Ecology·D John I ThomasJon R Saunders
Nov 5, 2016·Research in Microbiology·Alexandre BolotinAlexei Sorokin
Mar 17, 2000·FEMS Microbiology Ecology·L A Vilas-BôasO M Arantes
May 22, 2019·Microbiology Spectrum·Monika Ehling-SchulzTheresa M Koehler

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