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Appl Environ Microbiol. 1989 February; 55(2): 394-400

Campbell-like integration of heterologous plasmid DNA into the chromosome of Lactococcus lactis subsp. lactis.

K J Leenhouts, J Kok and G Venema

Institute of Genetics, University of Groningen, Haren, The Netherlands.

ABSTRACT

Integrable vectors were constructed based on the plasmid pHV60, which is essentially a pBR322 replicon carrying a chloramphenicol resistance marker, by inserting 1.3-kilobase chromosomal fragments of Lactococcus lactis subsp. lactis MG1363 into this plasmid. Three constructs as well as pHV60 were electroporated to strain MG1363. Transformants were obtained with all constructs, and also with pHV60 (albeit with low frequency). By using Southern hybridizations, it appeared that pHV60 showed homology with the chromosome of MG1363, and that it most probably uses this homology to integrate in a Campbell-like manner. The presence of chromosomal sequences in pHV60 stimulated insertion elsewhere in the chromosome by a factor of 5 to 100. In all cases the integrated plasmids were amplified, at a selective pressure of 5 micrograms of chloramphenicol per ml, to a level of approximately 15 copies per chromosome. Although the amplification was gradually lost under nonselective conditions, one copy remained stably integrated in the chromosome. The results show that a Campbell-like integration strategy can be used to improve the accessibility of the lactococcal chromosome for genetic analysis and is potentially useful in stabilizing unstable genes in lactococci.

Appl Environ Microbiol. 1989 February; 55(2): 394-400




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