Identification of a Lactose Utilization and Copper Resistance Plasmid in Lactococcus lactis subsp. lactis MCL64

Authors : Mustafa AKÇELİK

Pages : 783-787

View : 16 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Lactose negative and copper sensitive insert ignore into journalissuearticles values(Lac-/Cus); mutants of Lactococcus lactis subsp. lactis MCL64 were isolated after extended incubation periods at 32ºC and 37ºC. A 30.0 kb plasmid was absent in all Lac-/Cus mutants. These results showed that lactose metabolism and copper resistance were linked to the 30.0 kb plasmid in strain MCL64. Using MCL64 as a donor, the 30.0 kb plasmid transferred into Lac-/Cus recipient strains P81 and MCL64-90 with the frequencies of 4.1x10-5- 8.2x10-3 per donor cell, respectively. All transconjugants were found to be of a Lac+/ Cur phenotype.
Keywords : L lactis subsp lactis, lactose utilization, copper resistance, plasmid