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. 1991 Aug;173(15):4794–4798. doi: 10.1128/jb.173.15.4794-4798.1991

Replacement recombination in Lactococcus lactis.

K J Leenhouts 1, J Kok 1, G Venema 1
PMCID: PMC208158  PMID: 1906872

Abstract

In the pUC18-derived integration plasmid pML336 there is a 5.3-kb chromosomal DNA fragment that carries the X-prolyl dipeptidyl aminopeptidase gene (pepXP). The gene was inactivated by the insertion of an erythromycin resistance determinant into its coding sequence. Covalently closed circular DNA of pML336 was used for the electrotransformation of Lactococcus lactis. In 2% of the erythromycin-resistant transformants the pepXP gene was inactivated by a double-crossover event (replacement recombination) between pML336 and the L. lactis chromosome. The other transformants in which the pepXP gene had not been inactivated carried a Campbell-type integrated copy of the plasmid. Loss of part of the Campbell-type integrated plasmid via recombination between 1.6-kb nontandem repeats occurred with low frequencies that varied between less than 2.8 x 10(-6) and 8.5 x 10(-6), producing cells with a chromosomal structure like that of cells in which replacement recombination had taken place.

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Selected References

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