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When Lactococcus lactis subsp. lactis LM0230 is transformed by the lactose plasmid (pSK11L) from Lactococcus lactis subsp. cremoris SK11, variants with pSK11L in the integrated state can be derived (J. M. Feirtag, J. P. Petzel, E. Pasalodos, K. A. Baldwin, and L. L. McKay, Appl. Environ. Microbiol. 57:539-548, 1991). In the present study, a 1.65-kb XbaI-XhoI fragment of pSK11L was subcloned for use as a probe in Southern hybridization analyses of the mechanism of integration, which was shown to proceed via a Campbell-like, single-crossover event. Furthermore, the presence of the XbaI-XhoI fragment in a nonreplicating vector facilitated the stable, Rec-dependent integration of the vector into the chromosome of L. lactis subsp. lactis LM0230 and other lactococci. DNA sequence analysis of the fragment revealed an open reading frame of 885 bp with lactococcal expression sequences. The putative gene did not have significant homology with other genes in computer data bases. The XbaI-XhoI fragment is a naturally occurring piece of lactococcal DNA that can be used as a recombinogenic cassette in the construction of integration vectors for the industrially important lactococci.

applied and environmental microbiology

Molecular characterization of the integration of the lactose plasmid from Lactococcus lactis subsp. cremoris SK11 into the chromosome of L. lactis subsp. lactis