title: Restriction of DNA in Yersinia enterocolitica detected by recipient ability for a derepressed R factor from Escherichia coli.
abstract: A derepressed R factor, RY2drd2, was transferred at a frequency of 5x10minus 3 between two strains of Yersinia enterocolitica mated on a membrane. Under the same conditions transfer of this R factor from Escherichia coli to Y. enterocolitica was observed at a frequency of only 7-7x10minus 6. This frequency was greatly increased when the recipient strain was heat-treated before mating. Heat exposure for optimum fertility was 50 to 52 degrees C for a period of 2 to 3 min. Mutants of Y. enterocolitica were isolated which were infected by RY2drd2 from E. coli or from Y. enterocolitica at the same frequency. These observations strongly suggest that a DNA restriction and modification system in Y. enterocolitica causes its low recipient ability for plasmids from other species.
mesh_terms: D003227:Conjugation, Genetic; D003433:Crosses, Genetic; D004269:DNA, Bacterial / Q000378:metabolism*; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects*; D005111:Extrachromosomal Inheritance; D006358:Hot Temperature; D008851:Micropore Filters; D009154:Mutation; D015007:Yersinia / Q000187:drug effects* / Q000378:metabolism
chemical_list: D004269:DNA, Bacterial