title: Two plasmid-determined restriction and modification systems in Streptococcus lactis.
abstract: Two restriction and modification systems were found in Streptococcus lactis strain IL594 which was found to contain 9 plasmids designated pIL1 to pIL9. On the basis of protoplast-induced curing experiments, we showed that a restriction and modification system was related to the presence of pIL6 or pIL7. The pIL6-determined restriction and modification system was confirmed by cotransfer of the plasmid and of the restriction and modification system to a plasmid-free, nonrestricting, and nonmodifying derivative of S. lactis IL594.
mesh_terms: D001435:Bacteriophages / Q000502:physiology; D003227:Conjugation, Genetic; D004262:DNA Restriction Enzymes / Q000235:genetics*; D004269:DNA, Bacterial / Q000378:metabolism; D004279:DNA, Viral / Q000378:metabolism; D013294:Lactococcus lactis / Q000201:enzymology / Q000235:genetics*; D010957:Plasmids
chemical_list: D004269:DNA, Bacterial; D004279:DNA, Viral; D004262:DNA Restriction Enzymes