Mapping of two plasmids from Lactobacillus helveticus ILC 54, plasmid curing and preliminary studies on their involvement in lactose metabolism and peptidase activity

Two plasmids isolated from Lactobacillus helveticus strain ILC 54 were analysed by restriction digestion. A restriction map of the 14.3 and 5.6 kb plasmids is presented. Plasmid-curing studies suggest that these plasmids are involved in lactose metabolism and peptidase activity.