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Appl Environ Microbiol. 1992 February; 58(2): 699-702

IS946-mediated integration of heterologous DNA into the genome of Lactococcus lactis subsp. lactis.

Department of Microbiology, North Carolina State University, Raleigh 27695-7624.

ABSTRACT

The lactococcal insertion sequence IS946 was used to construct suicide vectors for insertion of heterologous DNA into chromosomal and plasmid sequences of Lactococcus lactis subsp. lactis. Electroporation of L. lactis strains, including the recombination-deficient strain MMS362, with the suicide vector pTRK145 yielded 10(1) to 10(3) transformants per micrograms of DNA. pTRK145 insertions occurred primarily in the chromosome, with one insertion detected in a resident plasmid. Vector-specific probes identified junction fragments that varied among transformants, indicating random insertions of pTRK145.

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