Nisin gene type in 2 Turkish and 3 Canadian strains of L. lactis subsp
. lactis was identified by amplification of nisin structural gene by c
loning and polymerase chain reaction. In this way, it was determined t
hat all tested strains had nisin A gene. For gene cloning a promoter-a
ctive vector, pNZ9019, was constructed and transformed into Escherichi
a coli E10.