Investigation of the relationship between lysogeny and lysis of Lactococcus lactis in cheese using prophage-targeted PCR

David O'Sullivan, R. Paul Ross, Gerald F. Fitzgerald, Aidan Coffey

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

The ability of lactococcal strains to lyse (and release intracellular enzymes) during cheese manufacture can be a very desirable trait and has been associated with improvement in flavor and acceleration of cheese ripening. Using a laboratory-scale cheese manufacturing assay, the autolytic behavior of 31 strains of Lactococcus lactis was assessed. In general, marked variation was observed between strains with a 20-fold difference between the best and worst lysing strains based on the release of the intracellular enzyme lactate dehydrogenase. In a parallel experiment, the genomes of these strains were examined for the presence of prophage integrase (int) sequences by using conserved primer sequences from known lysogenic phage. Results demonstrated that the lytic behavior of lactococcal starter strains significantly correlates with the presence of prophage sequences. These results highlight not only the contribution of prophage to starter cell lysis but also the potential of PCR as a useful initial screen to assess strains for this important industrial trait.

Original languageEnglish (US)
Pages (from-to)2192-2198
Number of pages7
JournalApplied and environmental microbiology
Volume66
Issue number5
DOIs
StatePublished - May 2000

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