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Appl. Environ. Microbiol., Jul 1995, 2461-2466, Vol 61, No. 7
Copyright © 1995, American Society for Microbiology

Expression of a Lactococcus lactis Phage Resistance Mechanism by Streptococcus thermophilus

S Moineau, SA Walker, BJ Holler, ER Vedamuthu and PA Vandenbergh
Quest International, Sarasota, Florida 34243

The 7.8-kb lactococcal plasmid pSRQ700 encodes the LlaII restriction/modification system which recognizes and cleaves the sequence 3(prm1)-GATC-5(prm1). When the plasmid pSRQ700 is introduced into a phage-sensitive Lactococcus lactis strain, strong phage resistance is conferred by the LlaII system. In this report, we show that pSRQ700 cannot replicate in Streptococcus thermophilus. However, if cloned into the vector pNZ123, the native LlaII system is expressed and strong phage resistance is conferred to various industrial S. thermophilus strains. Resistance against phages isolated from yogurt and mozzarella wheys was observed. To our knowledge, this is the first report of increased phage resistance in S. thermophilus.


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