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. 1990 Sep;56(9):2726–2735. doi: 10.1128/aem.56.9.2726-2735.1990

Stability of Integrated Plasmids in the Chromosome of Lactococcus lactis

Kees J Leenhouts 1,*, Jan Kok 1, Gerard Venema 1
PMCID: PMC184834  PMID: 16348281

Abstract

Derivatives of plasmids pBR322, pUB110, pSC101, and pTB19, all containing an identical fragment of lactococcal chromosomal DNA, were integrated via a Campbell-like mechanism into the same chromosomal site of Lactococcus lactis MG1363, and the transformants were analyzed for the stability of the integrated plasmids. In all cases the erythromycin resistance gene of pE194 was used as a selectable marker. Transformants obtained by integration of the pBR322 derivatives contained a head-to-tail arrangement of several plasmid copies, which most likely was caused by integration of plasmid multimers. Single-copy integrations were obtained with the pSC101 and pTB19 derivatives. In all of these transformants no loss of the erythromycin gene was detected during growth for 100 generations in the absence of the antibiotic. In contrast, transformants containing integrated amplified plasmid copies of pUB110 derivatives were unstable under these conditions. Since pUB110 appeared to have replicative activity in L. lactis, we suggest that this activity destabilized the amplified structures in L. lactis.

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