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research-article

Analysis of a region from the bacteriophage resistance plasmid pCI528 involved in its conjugative mobilization between Lactococcus strains.

Department of Food Microbiology, University College Cork, Ireland.

ABSTRACT

A 10-kb HindIII fragment of pCI528 cloned into the nonconjugative shuttle vector pCI3340 could be transferred by conjugative mobilization from Lactococcus lactis subsp. lactis MG1363, whereas other HindIII fragments of pCI528 or the vector alone were nonmobilizable. Subcloning of this 10-kb region identified a 4.4-kb BglII-EcoRI fragment which contained all the DNA essential for transfer. Sequence analysis of a 2-kb region within this 4.4 kb-segment revealed a region rich in inverted repeats and two potential overlapping open reading frames, one of which demonstrated homology to mobilization proteins of two nonconjugative staphylococcal plasmids.

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