Nestec S.a.

Olivier Marciset

Beat Mollet

Jacques Edouard Germond

Jan Knol

Bacteriocins from Streptococcus thermophilus

A promoterless foreign gene is intergrated into the lac operon of Streptococcus thermophilus by transforming a host strain of Streptococcus thermophilus with a donor plasmid which does not replicate in the host strain. The donor plasmid includes a vector backbone and a sequence containing a foreign gene operably intergrated into at least a part of the lac operon of the host strain, in front of at least a part of the lacZ gene of the lac operon, and the sequence conserves the frame of the genomic lac operon of the host strain. Cointegrate transformants are identified in which the complete donor plasmid is integrated into the geonomic lac operon of the host strain, and an integrant transformant is then selected, the genome of which does not include the vector backbone of the donor plasmid but does include the foreign gene, which is operably integrated in front of the lacZ gene of the conserved genomic lac operon and which is stably maintained and expressed upon selective pressure on expression of the lacZ gene.

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Lausanne, Switzerland

Olivier Marciset