The bacteriocin genes from the plasmid pDR1-6 of Lactococcus lactis subsp. lactis biovar diacetylactis DRC1 were cloned into pGKV21 and pGKV259 as 4.0 kb HindIII and 9.5 kb EcoRI fragments, and expressed in plasmid-free and bacteriocin-non-producing strain L. l. lactis DRC1021. The nucleotide sequences of the genes were identified as a part of operons of lactococcin A and M.