Abstract
A simple method for curing plasmid DNA from lactic streptococci is described. When strains of lactic streptococci are grown overnight at 32 degrees C in an unbuffered medium (M17-) and held at the same temperature for an extended period (96 h), the acid environment induces loss of plasmid DNA of different sizes. If the process of growth in M17- broth followed by extended incubation at 32 degrees C is repeated, most of the plasmids are lost, as revealed by gel electrophoretic profiles of DNA. The method is simple and efficient in curing plasmids of lactic streptococci without use of any mutagenic chemical.
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