I sex factors and chromosomal recombination in Salmonella typhimurium

Hfr formation by I pilus-determining plasmids in Escherichia coli K-12

R483, an atypical, I pilus-determining plasmid, and also R144, a typical one, were shown to suppress the DnaA phenotype by integration into the Escherichia coli chromosome.

Transience of the donor state in an Escherichia coli K12 strain carrying a repressed R factor

De-repression of the plasmid R100 in Escherichia coli is essentially a transient phenomenon resulting in the transfer of several R factors to different recipient cells from a single donor cell.

Chromosome transfer by autonomous transmissible plasmids: the role of the bacterial recombination (rec) system

The ability of autonomous transmissible plasmids or sex factors to transfer chromosomal genes to F(-) recipient bacteria has been investigated by using a series of rec(+) and recA(-) donor strains. It is concluded that chromosome transfer by most sex factors is virtually dependent upon the functional integrity of the bacterial recombination system. However, evidence is presented that suggests the existence of plasmid-specified mechanisms of interaction with the chromosome which are independent of the bacterial recombination system.

The integration of autonomous transmissible plasmids into the chromosome of Escherichia coli K12

The highly selective technique of integrative suppression has been used to determine the ability of autonomous transmissible plasmids to integrate into theE. colichromosome.

All theF-like transmissible plasmids appear to be able to integrate, suppress the initiation defect and formHfr-type donor strains. However, there is no evidence of integration with theI-like transmissible plasmids examined.