Mapping of three plasmids from Lactobacillus helveticus ATCC 15009

Three plasmids isolated from Lactobacillus helveticus ATCC 15009 were analysed by restriction digestion. A restriction map of the 22.0, 6.0 and 3.5 kb plasmids is presented. The existence of genetic markers such as carbohydrate fermentation, lactose metabolism, antibiotics and heavy metal ions resistance was also investigated but the plasmids remain cryptic.