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Insertional inactivation of the plasmid-encoded determinants for Mg(2+) and Co(2+) transport, orf18/corA, provides a tool for screening recombinant clones in Lactococcus, based on the observation that overexpression of orf18/corA results in cell growth inhibition on certain concentrations of CoCl(2). The lacticin 3147 immunity gene, ltnI, was used to insertionally inactivate orf18/corA. The resulting clones were capable of growth on concentrations of CoCl(2) that were inhibitory to the parent strain. Since only 3 of 17 lactococcal starters naturally harbor corA, the system has potential as a screen for selecting recombinant lactococcal clones.

applied and environmental microbiology

Insertional Inactivation of Determinants for Mg 2+ and Co 2+ Transport as a Tool for Screening Recombinant Lactococcus Species Clones