Mobilization of Bacillus thuringiensis Plasmid pTX14-3

Tidsskriftartikel - 1995


The Bacillus thuringiensis subsp. israelensis (Bti) plasmid pTX14-3 has been reported to contain a gene, mob14-3, with considerable homology to genes encoding mobilization proteins from other gram-positive bacteria. We have used the aggregation-mediated conjugation system recently discovered in Bti to compare the mobilization kinetics of different derivatives of plasmid pTX14-3. Plasmid pTX14-3 has been found to replicate by the rolling-circle mechanism and to contain a locus suppressing the formation of high-molecular-weight DNA. We found that deleting a DNA fragment containing this locus increased the transfer frequency about twofold. The mobilization frequency of the plasmid containing the intact mob14-3 gene did not indicate a mobilization-enhancing activity of the encoded polypeptide. However, the presence of the mob14-3 gene seemed to increase the stability of the plasmid in exponential growth.


Andrup L, Bendixen H, Jensen G. Mobilization of Bacillus thuringiensis Plasmid pTX14-3. Plasmid 1995;33(3):159-167.
doi: 10.1006/plas.1995.1017

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