The present invention relates to a new Lactococcus lactis subsp. lactis LDTM 6804 strain having excellent antibacterial activity, and isolated from raw milk from Gangwon-do, South Korea. The present invention, particularly, relates to a new strain which can be utilized as a natural preservative in various processing methods of processed foods, such as food processing and preservation, and for a starter for fermentation, and the like, by producing nisin Z among bacteriocins which are antibacterial materials unique to microorganisms, thereby having strong antibacterial activity against various Gram-positive and Gram-negative bacteria and spoilage bacteria.;COPYRIGHT KIPO 2020
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